Cthulhu Mythos/Characters

== This is a compendium of all those things squamous, rugose, and otherwise weird from the writings of HP Lovecraft and pals. Since all of these are eldritch monstrosities, a paragraph descriptor will be necessary for each. The stars are right. ==

Abdul Alhazred, AKA The Mad Arab
Author of the dreaded Necronomicon, and a Moslem apostate who worshiped the Great Old Ones. Described as an insane poet, Alhazred visited many strange and dark places filled with weird horrors. He was eaten by an invisible monster in broad daylight in 738 A.D. according to one record.
 * As Long As It Sounds Foreign: In Arabic, Abdul Alhazred makes no sense. Others have attempted to correct this, by saying that this is a corruption of the original name. Which is Truth in Television, since many ancient Arabic writers or works are better known by their bastardized names.

Specifically, it is often said to be a corruption of Abd Al-Azrad, a name -- or, more likely, a title or pseudonym -- best translated as "servant of the Great Devourer."
 * Author Avatar: Abdul Alhazred was Lovecraft's play name when he was younger.
 * Defictionalization: The Necronomicon listed in the Ohio University Library card catalog. L Sprague De Camp, fantasy author and linguist, acted as Abdul Alhazred's "translator".
 * Death Faked for You:
 * Junkie Prophet: Considering the Mythos, Abdul does drugs to forget the horrors he has seen.
 * Mad Oracle
 * Shout-Out: After Cthulhu and the Necronomicon, "The Mad Arab" is one of the most referenced elements in non-Mythos works.
 * Sincerest Form of Flattery: Many of Lovecraft's friends created their own unspeakable tomes in homage to Lovecraft's Necronomicon. Like Abdul, the fictional writers of these books meet dark ends.
 * Tome of Eldritch Lore: Wrote the modern archetype of all other eldritch grimoires.

Herbert West
Medical student, then a doctor. Postulating that human life was purely material, Herbert believed with the right chemicals could restart life. He and an assistant go about trying to prove this, conducting questionable experiments with...interesting results.
 * Chemistry Can Do Anything
 * Damaged Soul: The many failed results of bringing back the dead.
 * Dragged Off to Hell:
 * First-Person Peripheral Narrator: West's unnamed assistant, originally a medical student who became fascinated with West.
 * Mad Doctor: A graduate of the Miskatonic University Medical School no less.
 * Mad Scientist: Noble in intent, West's methods become increasingly unethical and deadly. It eventually drives him over the edge.
 * World War One: Herbert and his pal joined the Canadian military during the "Great War" as surgeons. For West, it's a great way to access more test subjects.

Randolph Carter
Early 20th century Boston author and occultist. One of the few recurring human characters within the Mythos, Carter is capable of entering the Dreamlands. Another Author Avatar: an unnoticed writer, prone to nervousness and depression. However, he is capable of courageous feats.
 * A Chat with Nyarlathotep
 * Badass Bookworm
 * Friend to All Living Things: Friendly to cats, as well as ghouls of all things.
 * I Was Having Such a Nice Dream: Carter's journey in The Dream-Quest of the Unknown Kadath.
 * Nietzsche Wannabe: Comes off as this in The Silver Key.
 * Seers: Since from a young age, Carter had the gift of prophecy, as well as a powerful dreamer.
 * The Quest: Several, including the well known Dream-Quest
 * White Anglo Saxon Protestant: Standard for a Lovecraft hero.
 * World War One: A veteran of the conflict, having served in the French Foreign Legion.

Outer Gods
== Entities of the Mythos who operate on a cosmic scale, and tend to be far more powerful than most Great Old Ones. The Outer Gods are related to natural forces, such as Radiation, Time, or Childbearing. This classification originated in the Call of Cthulhu RPG, and recently has been used within mythos literature. ==
 * Bigger Bads: As if the giant squid-headed horror and headless fat pervert wasn't bad enough, these guys far more powerful and dangerous.

Azathoth, AKA The Daemon Sultan
One of the two most powerful entities in the main canon (the other being Yog-Sothoth), Azathoth is a mindless, formless being of nigh-unlimited power that may have created the universe, which it dwells at the centre of with a coterie of (relatively) minor deities that serve as its "entertainment." Described as ultimate chaos. Lovecraft meant this deity to embody the mindless yet unbendable forces of physics.
 * Before and After Pictures: Done in Campbell's "The Insects from Shaggai", where the protagonist sees an image of Azathoth before he became insane. The Daemon Sultan once looked like a multi-legged clam, with cylinders for appendages, a mouthless face, and black hair. The narrator also sees the "After" picture...
 * Deadly Decadent Court: Of a decidedly bizarre sort.
 * Deus Ex Nukina: Literally, since Azathoth is not only related to radioactivity, but can be summoned using fissionable materials.
 * Expy: Editor Robert Price thinks he's one for MANA-YOOD-SUSHAI from The Gods of Pegana, and indeed Lovecraft has mentioned in letters that he got ideas for his "Other Gods" (his term for what later became the Outer Gods) from that book.
 * God Is Evil: More like "is a deranged idiot".
 * Having a Gay Old Time: A more serious example, in which Lovecraft described Azathoth as The Nuclear Chaos. At the time, "nuclear" referred to something in the center, as in nucleus. As time went on, "Nuclear" became associated with atomic energy and weapons. Latter writers took advantage of this, and made Azathoth the patron of radiation.
 * King of All Cosmos: One of the weirdest supreme beings out there.
 * Mad God
 * Magical Flutist: The Servitors of the Outer Gods, who play flutes and drums to Azathoth. Needless to say, the music likely isn't pleasant to human ears.
 * Primordial Chaos: Lovecraft called it "Ultimate Chaos". Later authors made Azathoth an inversion: It wasn't always ultimate chaos. It became that way after losing its mind.
 * Obliviously Evil: Comes of being utterly mindless.
 * Ominous Floating Castle: Replace "Castle" with "Throne", and instead of floating in air, it floats in the center of the universe.
 * Rocks Fall, Everyone Dies: Occurs in the Arkham Horror board game when Azathoth is summoned.
 * Truly Single Parent: Reproduced by fission, producing offspring who were hermaphroditic. These "androgynes" also count as this, as they oddly did not need any aid for reproduction.
 * The Tunguska Event: One of its children, a Spawn of Azathoth is responsible for this.
 * The Scottish Trope: "Azathoth" is a pseudonym; It's real name is (thankfully) unknown.
 * Ultimate Evil: Played with. Azathoth is an insanity-inducing, blasphemous horror, but it's more due to being an insane chaos than being evil.

Daoloth, AKA The Render of Veils
Extradimensional Outer God who appears to humans as a strange geometrical jumble. Seeing it in person would drive a man to madness.
 * Another Dimension: Daoloth can send others into these.
 * Be Careful What You Wish For: Can be summoned to grant a wish, which in one instance is used to show the true nature of reality. It doesn't go so well.
 * Summoning Artifact: The image of Daoloth is needed to contact him, as well as some sort of black plastic pentacle to hold him. You do NOT want to botch the pentacle part.
 * You Cannot Grasp the True Form: Daoloth's images are difficult enough for human eyes to perceive. Also, be careful when The Render reveals how reality itself really appears.

Ghroth, AKA The Harbinger
A red-brown planet sized Outer God that travels space. When he approaches a world, it awakens the local Great Old Ones which leads to a planet's demise.
 * Bad Moon Rising
 * Eyes Do Not Belong There: Has a single, gigantic eye. No planet should have a literal eye.
 * Hidden in Plain Sight: How does anyone not freak out when a world-sized Old One approaches a world? Ghroth simply keeps its eye closed.
 * That's No Moon: Might as well be the "Death Star".

Nyarlathotep, AKA The Crawling Chaos
The heart and soul of the Outer Gods, messenger of Azathoth. The most human of the Great Old Ones, as well as the most overtly malevolent. Has many "masks" - avatars that range in different shapes and forms. The most common visage is that of a tall, dark man with a regal appearance.
 * Ancient Egypt: Where it originally was worshiped (at least by humanity), gaining the suffix -hotep. However, The Mighty Messenger was so evil that Egyptians forbade it's cult. The Black Pharaoh mask looks like the idealized king of this period, and maybe the one form that isn't outright frightening.
 * Anthropomorphic Personification: Gnarly is the soul of the Outer Gods. Another hypothesis is that Nyarlathotep is the physical embodiment of the Great Old Ones' telepathic powers.
 * The Blank: The The Faceless God and The Dark One avatars.
 * Deal With the Devil: He will try to sucker you into one if he simply doesn't try to gruesomely murder you. The latter is usually preferable unless you're the kind of person who doesn't mind what dealing with a malicious Cosmic Horror can lead to.
 * Evil Is Petty: Compared with Cthulhu's continent-destroying and Ghroth's world-shattering, Nyarlathotep is pretty petty in his schemes. This is likely intentional.
 * Fighting a Shadow: All of Nyarlathotep's physical forms are merely avatars. He is the personification of the soul of the Outer Gods, so whether he actually has a real body at all is not quite clear.
 * Formulaic Magic: Kruschtya Equation aspect that is simply a mathematical formula. Whoever solves it is possessed by Gnarly.
 * Gender Bender: Has several female masks, including the Bloated Woman and the Queen In Red.
 * Also used Mythos-derived works, such as Ow My Sanity, Nya and Nyarko San.
 * Great Old One In Human Form
 * Hostile Weather: Yes, the Crawling Chaos evens manifests as weather, such as the Crawling Mist, Black Wind, and Messenger of the Old Ones masks.
 * Humanoid Abomination: Usually.
 * I Have Many Names: In addition to all its aspects, Gnarlly has a number of titles: Crawling Chaos, Black Messenger of Karneter, Lord of the Desert, etc.
 * Jerkass Gods: Yeah.
 * Keeper of Forbidden Knowledge: Knows a lot about science and horrible secrets, and will provide answers... for a price.
 * Light Is Not Good: The White Man avatar, an angelic looking blond man with with white robes.
 * Dark Is Evil: See Scary Black Man.
 * Living Statue: The Faceless God and The Beast masks are these of The Sphinx.
 * Mad Scientist: Lovecraft presents Nyarlathotep as this in the eponymous poem.
 * Mechanical Monster: The Tick-Tock Man avatar, which the he appears as a mechanical being. Could range from Clockwork Creature to Artificial Intelligence.
 * Name's the Same: In-universe example with the "Black Pharaoh", which could refer to the avatar or to the pharaoh Nephren-Ka. It could just be that Nephren-Ka was called that because of his evil acts, or taken up the title to enhance his power. Or, as some speculate, Nephren-Ka was really Nyarlathotep all along.
 * Nikola Tesla: The main influence for Nyarlathotep.
 * No, Mr. Bond, I Expect You to Dine: Has friendly conversation with Randolph Carter in The Dream-Quest of Unknown Kadath, though it's just to trick him.
 * Official Couple: According to Clark Ashton Smith, the elk-goddess Yhoundeh is Nyarlathotep's wife.
 * One-Winged Angel: Destroy one avatar, and the Chaos transforms into something even more mind-shattering.
 * Only Sane Man: He is the living embodiment of the (rather malevolent) consciousness of the Outer Gods, and their messenger, and has taken special interest in mankind... this is not good for mankind.
 * Our Banshees Are Louder: The Dweller in Darkness can create wind-like sounds (even when there is no wind) and strange cries at night.
 * Our Demons Are Different: The Black Demon and Dark Demon masks are traditional versions: black, furry, and snouted beasts. The Haunter of the Dark is a bat-like thing with a three-lobed eye.
 * Revision: L'rog'g (a twin-headed bat worshiped on Uranus) and Shugoran (The Black Man With a Horn) had no connection to Gnarly in the works they appeared in. Latter RPG material changed it so they became avatars.
 * Satan: A messenger(which is what the word "angel" means) for Azathoth who's shown to have resentment for the Outer Gods, one of few truly evil figures in the mythos, and a supreme manipulator. Yeah, Nyarly's the closest thing to the Devil, and possibly even more dangerous.
 * The Arkham witch coven believed that The Black Man was this. Wither or not this was intentional on Nyarlathoep's part or its what the witches just assumed is unknown.
 * Scary Black Man: How his Human avatars tend to appear. Although it should be noted that it's usually just the color of his skin (as in pitch-black) instead of overall physiognomy.
 * Summoning Artifact: The Shining Trapezohedron, which calls the Haunter in the Dark aspect of Nyarlathotep.
 * Trickster Archetype: A very evil incarnation of it, especially in The Dream-Quest Of Unknown Kadath.
 * Unperson: The Egyptians took great lengths to remove any and all reference to Gnarly, though a few cults remain.
 * Villains Blend in Better
 * Weakened By the Light: The Haunter of the Dark could be instantly banished by light. But only to this avatar.
 * Xanatos Gambit: His could be considered Xanatos Roulettes except for the fact that in this case it's perfectly reasonable to assume he can actually predict and engineer all possible outcomes.
 * You Cannot Grasp the True Form: "...pray to all space that you may never meet me in my thousand other forms."

Shub-Niggurath, AKA The Black Goat of the Woods with a Thousand Young
Outer God of fertility. One of the most worshiped of the Mythos entities, she is revered by the Mi-go, K'nyani, and human cults past and present, among others. While never described directly in Lovecraft's tales, Shubby is often portrayed as a cloud with constantly changing hoofs and tendrils.
 * Affably Evil: Seemingly one of the least apathetic of the Outer Gods, a goddess of fertility who looks after her cultists. It's not as if anyone but her cultists would want her attention, however.
 * Call a Smeerp A Rabbit: Shub-Niggurath looks like anything but a goat.
 * Explosive Breeder
 * Hermaphrodite: Also has been called The Black Ram of The Forest With A Thousand Ewe, so Shub-Niggurath may have a male aspect as well. Then again, considering the Outer gods are beyond human comprehension, giving any "gender" to one would be problematic.
 * Immortality: Can confer Biological Immortality to followers/sacrifices by ingesting them, and being reborn through her..
 * Mother of a Thousand Young: Trope Namer. (The horrible cloud with tendrils and mouths in that trope's image? That's her.)
 * The Smurfette Principle: Out of all Lovecraft's Old Ones, Shubby is the only one explicitly mentioned to be "female".

Yibb-Tstll
An obscure Mythos entity - a female, gigantic humanoid with detached eyes. Watching the universe revolve around it, she sees everything at the same time. Has great wisdom, only surpassed by Yog-Sothoth.
 * Alien Blood: The Black, Yibb-Tstll's ebon hued ichor. Adding to the strangeness, it's not a fluid, and more like snowflakes.
 * Bloody Murder: The Black can be used as by sorcerers to attack and destroy their enemies. It does involve a complicated ritual to do. Not to mention the spell could be reversed.
 * Covered in Gunge: Anyone the victim of The Black is covered head to toe in the stuff.
 * Multi Boobage: It has innumerable breasts, from which Nightgaunts feed upon.

Yog-Sothoth, AKA The Key and the Gate
The other supreme deity of the original Lovecraftian canon, Yog-Sothoth is the living, sentient embodiment of the time-space continuum, although for reasons unknown he/it is trapped outside of our reality, only manifesting through various rituals. Is capable of impregnating human females. Its most well-known appearance is as a conglomeration of ever changing, glowing spheres, though this is just one of several forms.
 * Affably Above Good and Evil: At least in the form of Tawil At-'Umr.
 * Arch Enemy: Xexanoth, the Lurking Chaos is this to Yog's avatar Aforgomon. Xexanoth is the "chief cosmic power" hostile towards time. One can relive the past by invoking it's power, but is considered too blasphemous even for evil sorcerers.
 * Demoted to Extra: Lovecraft originally referred to his loose Mythos as the "Yog-Sothoth Cycle." Most people tend to forget this.
 * Did We Just Have Tea With Cthulhu's Boss?: Yes you did, Randolph Carter. Yes you did.
 * Extra Eyes: Another portrayal of Yog-Sothoth is having many eyes on stalks.
 * Evil Sorcerer: Yog serves as the patron of these.
 * Fartillery/Gasshole: Yog-Sothoth. "By a Stench ye shall know Him..." At the end of The Dunwich Horror, it lets out a shockwave of foul air so powerful it knocks trees over.
 * Gate of Truth
 * God Is Evil: About as far up in the pantheon as Azathoth and just as (if not more) terrifying.
 * A Form You Are Comfortable With: Tawil At-'Umr.
 * Hot Skitty-On-Wailord Action: Oh, those Whateleys!
 * Light Is Not Good: Yog's avatar Aforgomon, who appears with a blinding flash, and only shows up when angered.
 * Omniscient Morality License: Perhaps. Or perhaps not.
 * Ret-Gone: Aforgomon does this to particular offenders  Instead of wiping them outright, the avatar speeds up the normal process of oblivion. Instead of years, people slowly forget the victim and any record eventually fades away in weeks.
 * Sphere of Destruction: Literally in this case. Physical contact with Yog-Sothoth leads to serious injuries.
 * The Man Behind the Man: To Cthulhu, who is his high priest.
 * Threshold Guardians: Tawil At-'Umr serves as this, before anyone passes The Ultimate Gate.
 * Time Master: Helps that Yog is space-time.
 * Ultimate Evil
 * Void Between the Worlds: Despite being space and time, at the same time Yog is kept "outside" it as well.

Great Old Ones
== Ancient, powerful horrors of the mythos, who are either sleeping or imprisoned. Often the center of cults, and encounters with them lead to death or worse. Originally, the term "Great Old Ones" included the "Outer Gods". Today, the term is used to describe mythos deities that are not dynamic or powerful enough to operate on a cosmic level. ==

Atlach-Nacha
A giant spider with a human face. Other forms include a young woman with multiple arms. He (or she) lives in a cavern under Mount Voormithadreth in ancient Hyperborea, and works on an endless task of bridging a chasm. Because of its appearance, Atlach is considered the regent of all spiders. The Spiders of Leng (huge purple spiders) are believed to be her children and servitors.
 * All Webbed Up
 * Giant Spider
 * Gender Flip: Was male when introduced by Clark Ashton Smith. Latter writers referred to Atlach as a female.
 * Odd Job Gods: Atlach-Nacha spends all her time bridging a vast chasm.

Cthulhu
The monstrous high priest of the Great Old Ones, sleeping in the sunken city of R'lyeh until 'the stars are right' and he can awaken his kin to resume their rule of Earth. A gigantic humanoid form with a squid-like head and dragon wings.
 * Breakout Character: There's a reason H.P. Lovecraft's works are known as the Cthulhu Mythos.
 * Combat Tentacles
 * Cthulhumanoid: The Trope Namer for such a look.
 * Do Not Taunt Cthulhu: Happens in "The House of Cthulhu", in which a band of barbarians go to R'lyeh. The leader believes Cthulhu is nothing more than a myth to scare away the weak, and his "tomb" holds vast riches. Let's just say he's wrong.
 * Did You Just Punch Out Cthulhu?: Happens to the main man himself. See Ramming Always Works.
 * Good Thing You Can Heal: It sure helps when some pesky human puts a steam yacht through your head.
 * High Priest: Of the Great Old Ones.
 * King in The Mountain: Of the lost civilization of the Great Old Ones. Needless to say, a particularly dark example.
 * Kraken and Leviathan
 * Mini-Mook: His servitors The Star-spawn of Cthulhu, who are basically smaller versions of Big C. Even then, they're still very large relative to a human.
 * Ramming Always Works: Gets rammed into by the motor boat of the one person who survives him, breaking him up and forcing him back into R'lyeh, which promptly sinks.
 * Big Bad For the entire series and adaptions
 * Sealed Evil in A Can
 * Underwater City / Underwater Ruins: The city of R'lyeh, the tomb and prison of Cthulhu, is a sort of twisted version of Atlantis.
 * Villain Protagonist: Very often in parodies, Cthulhu will be the protagonist. Taken further with Cthulhu Saves the World, were the Big C is the hero of a video game.

Cthugha
Entity which appears as a giant fireball. The Fire Vampires, little flame-like monsters that ignite anything flammable, are Cthugha's servitors.
 * An Ice Person: It's offspring Aphoom-Zhah. Appearing to be a gray flame, Aphoom freezes upon contact.
 * Elemental Embodiment: Derleth created an Elemental Theory, in which certain Great Old Ones were classified by the four classical elements. However, Derleth ran into a problem: no Great Old One could be considered a Fire Elemental. So Cthugha was created to fill in the gap.
 * Kill It With Fire: Literally.
 * Playing With Fire: Both Cthugha and his Fire Vampires.
 * Start X to Stop X: How do you stop Nyarlathotep? By summoning Cthugha.
 * Screw that up, however... And you summon "the Feaster from Beyond the Stars."

Cthylla
The secret daughter of Cthulhu, and described as a huge, red octopus with six eyes and wings.
 * Crazy Prepared:
 * Dark Secret: Cthulhu does not want anyone to know Cthylla exists. And the few humans that discover the Cthylla's purpose go mad.
 * Daddy's Little Villain: Wither or not by choice, being Cthulhu's daughter alone makes her an enemy of mankind.
 * Knight Templar Parent: Played with, Cthulhu goes great lengths to protect his seed, but not because he cares for Cthylla. Any human emotion is beyond the Great Old Ones.
 * Moe Anthropomorphism: Notable since it's easier searching for art depicting Cthylla as human girl than octopus.

Eihort
A giant gelatinous oval with many legs, Eihort wanders the labyrinth-like underground tunnels of the Severn Valley. When encountering a mortal, Eihort will chase and corner them, then offer to lead them out of the tunnels in return for letting it implant its egg inside their body. Should they refuse, Eihort will just smash them into a bloody pulp...which isn't really worse than those who accept its offer, as the egg will eventually hatch, and the victim's body will shatter into countless brood of Eihort.
 * Body Surf: The upside to Eihort's bargain: It'll let you experience other lives in other places. Of course, the reverse is true: Eihort's servants could jump into the Bargainer's body, and have that person face some rather horrible experiences.
 * Bilingual Bonus: Eihort's name roughly translates to "Egg Hoard" in German.
 * Heads I Win, Tails You Lose: You're pretty much screwed once Eihort catches you.
 * Face Full of Alien Wingwong
 * Freak-Out: When the time comes for Eihort's brood to emerge, the bargainer begins to feel some weird sensations.
 * The Maze: Where Eihort dwells.

Ghatanothoa
First born of Cthulhu, this Great Old One visage is so horrific that merely glimpsing it leads to... something unspeakable. Served by the Lloigor.
 * Ascended Extra: Consider the similarities, Ghatanothoa might have been just another name of Cthulhu back when Lovecraft introduced him.
 * Brown Note: Simply looking at him.
 * Fate Worse Than Death: You look at him, and you are near instantly mummified, save for your brain and internal organs. And you are completely awake and aware of everything that goes on around you for every moment of this existence.

Glaaki
Once trapped inside a meteor, Glaaki now resides in the lake created by impact of said meteor in the Severn Valley. Looks like giant slug with a mouth, eye-tip tentacles and lots of metallic spines. When Glaaki stabs people with its spines, it injects fluids that turn the victims into zombies which it can controls using psychic power.
 * Our Zombies Are Different: After a few decades, Glaaki's zombies becomes sensitive to sunlight. If exposed, they suffer from "The Green Decay".
 * Recurring Dreams: People who live by Glaaki's lake have some terrible nightmares. Except.
 * Spikes of Doom
 * Tome of Eldritch Lore: The Revelations of Glaaki. It not only deals with the spiky one, but also the various weirdness in the Severn Valley.
 * Slave Mooks: It's undead servants were once humans, until their transformation.

Hastur, AKA Him Who Is Not to be Named
"Half-brother" of Cthulhu. Doesn't mean they get along with each other. Known to be the patron of decadence, nihilism, and shepherds. Also the mate of Shub-Niggurath, and possibly fathered some of her Thousand Young. His most well known avatar is the King In Yellow (a tall masked man-thing wearing yellow rags). Other depictions includes that of a octopoid, but Hastur's true form is unknown.
 * Ascended Extra: When Lovecraft added Hastur to mythos, all he did was just mention it among a list of eldritch names without any elaboration. Derleth made Hastur into a Great Old One, since Ambrose Bierce originally had it as a deity.
 * Bright Is Not Good: If he takes a humanoid guise, it will often be brightly clothed. He's not any less dangerous.
 * Body Horror:
 * Cain and Abel: With the Big C himself.
 * Candle Jack: Whatever you do, don't say his name three times in a row. Better yet, never say it at all, just in case.
 * Composite Character: Hastur is essentially a mash-up of several interpretations from several different sources, each either borrowing or name dropping the previous source. John Tynes finally combined the various aspects, especially the themes of from the original The King in Yellow, for the Call of Cthulhu RPG.
 * Deal With the Devil: The Unspeakable Oath.
 * Iconic Logo: The Yellow Sign.
 * Humanoid Abomination: The King in Yellow.
 * Light Is Not Good: In addition to his yellow robes, Hastur sometimes appears with a halo. He is also usually depicted with angelic wings for no discernible reason.
 * Malevolent Masked Men:
 * Mad Artist / Mad Dreamer: Has influence over these.
 * The Scottish Trope: As a result of Canon Immigrant from the Deities and Demigods Cyclopedia, it's name literally became "unspeakable" in the Mythos.
 * They Would Cut You Up: The Brothers of the Yellow Sign hunt down and torment the Mi-go on behalf of Hastur.
 * Summoning Ritual: The play The King In Yellow can call down the eponymous avatar of Hastur.

Hzioulquoigmnzhah
Tsathoggua's "cousin" living in the upper atmosphere of Saturn, where he fled to avoid irritating worshipers and cannibalistic family members. Similar in appearance to Tsathoggua, but with a long neck and many small, elephantine feet.
 * Affably Evil: Possibly the most harmless of Lovecraftian deities simply by wanting to be left alone.
 * Keeper of Forbidden Knowledge: Unlike most, however, all you really need to do is ask.
 * The Philosopher: In "The Family Tree of the Gods", Smith describes Hzi as "a rather reflective and philosophic deity". This is likely why he wants to be left alone.
 * Our Monsters Are Weird: His appearance, while not as disturbing as the vast majority of the Old Ones, is definitely bizarre.
 * The Unpronounceable: Even for the Mythos.

Ithaqua, AKA The Wind-Walker
Great Old One that is humanoid in appearance, with glowing red eyes. Limited to frozen wastes, Ithaqua can literally walk on wind as if it was solid ground.
 * Alien Abduction: Tends to kidnap people, typically sacrifices, and even entire towns if need be.
 * An Ice Person: Rather, an ice deity.
 * Elemental Embodiment: Like Cthugha, Ithaqua was introduced into the mythos to balance out the Elemental Theory. In this case, The Wind-Walker is an Air Elemental.
 * Grim Up North: This Old One tends to haunt Alaska and Siberia.
 * Leave No Witnesses: Anyone who sees Ithaqua is bound to be hunted down by him.
 * Mars Needs Women: Ithaqua attempts to reproduce with humans, apparently so his children would have his powers, but not be imprisoned by the Elder Gods.
 * Wendigo: Ithaqua is known as this as well.

Rhan-Tegoth
Originally from Yuggoth, Rhan-Tegoth came to Earth millions of years ago, settling in what would become the arctic. However, Rhan went into hibernation and can't move without some outside aid. One of the more unfortunate Old Ones, as he got stuck being used as some statue in a museum. Physically, he's very tall, covered in small tentacles, has six serpentine appendages with black crab pincers, a three-eyed and gilled head, a globular torso, as well as a proboscis.
 * Human Sacrifice: Played with, the blood of any living thing is sufficent to awake Rhan.
 * Cosmic Keystone: One character believes if Rhan-Tegoth dies, the Great Old Ones will never return. Then again, said character wasn't exactly sane...
 * Gods Need Prayer Badly: Apparently went into hibernation after his original followers abandoned him. Although, it's more due to that Rhan-Tegoth needs blood to sustain himself than prayer.
 * Refuge in Audacity: What do you do with a Cosmic Horror that's been sleeping for eons? Stick him in a wax work display!
 * Wax Museum Morgue: The guy who found Rhan-Tegoth runs one of these.

Shudde-M'ell
Leader of the Cthonians: worm-like monsters with a squid-like head. Shudde appears like a larger form of a Cthonian, and possibly the progenitor of the species.
 * Broke Your Arm Punching Out Cthulhu:
 * Eyeless Face
 * Nigh Invulnerability: Shuffle-M'ell can take on a nuclear explosion and live, as well as able to bore through Earth's crust and survive in the planet's mantle.
 * Made of Iron: Cthonians are able to resist great pressures and temperatures.
 * Mama Bear / Papa Wolf: Generally, it’s a bad idea to mess around with Cthonian eggs.
 * Mental Fusion: Groups of Cthonians can combine their psychic powers to overcome any protection.
 * Psychic Link: All Cthonians are linked to each other, allowing to know exactly what other one knows.
 * Sand Worm: Cthonian physical appearance suggests this, but they're more like the Horta from Star Trek the Original Series. They can easily burrow through rocks, and can resist high pressure and heat. Although, the Cthonians and Sandworms do share the same...
 * Weaksauce Weakness: Cthonians don't take well to exposure to, of all things, water. Which helps explain why they usually tend to stay safely miles underground rather than visit Earth's mostly water-covered surface, of course.
 * Telepathy: The worms can influence a person's thoughts and emotions, causing them to make mistakes or force them to stay in one location.
 * Tome of Eldritch Lore: The G'harne Fragments, which tell of the history of the Cthonian city.
 * Tunnel King: Cthonians excel at this.

Tsathoggua, AKA The Sleeper of N'kai
Old One whose visage is that of a furry, huge toad. The Sleeper was born outside the solar system, where he immigrated with his family to Yuggoth, and eventually making his way to Earth. He briefly resided under Mount Voormithadreth, and is often mentioned in the Hyperborean Cycle. Tsathoggua currently resides in N'kai, deep under the Earth. He is served by the Formless Spawn, black ooze capable of changing shape.
 * Affably Evil: Surprisingly laid-back for an Eldritch Abomination.
 * Deadpan Snarker
 * Dysfunctional Family: Humorously for a Cosmic Horror, Tsathoggua has a number of family members. Some of which want to eat each other.
 * Evil Sorcerer: The patron of these back in Hyperborea (The Smith one), including the infamous Eibon.
 * Oh Crap: Was once a popular deity among the K’n-yani. Then they discovered something horrid about Tsathoggua, and quickly removed any imagery or worship of the toad.
 * Portal Door: The titular The Door to Saturn was given by the Toad as a gift.
 * Tome of Eldritch Lore:
 * The Parchments of Pnom, which chronicles the genealogy of Tsathoggua and several Great Old Ones. Unlike some other examples, it's not notably dangerous.
 * The Book of Eibon (aka the Liber Ivonis), which told of the adventures of the titular Hyperborean wizard. Ebion also recorded Tsathoggua's secrets and rituals in the book.
 * What Do You Mean It's Not Awesome?: He's a giant, furry toad from space with magical powers.

Yig
The half-human Father of Serpents, this Old One is the patron of snakes. May have been the inspiration for the Aztec Quetzalcoatl, Yig was worshiped in North America by Plains tribes and the K'n-yani. Very impulsive and tyrannical, but beneficial to those kind to his "children".
 * Instant Death Radius: Done in the Call of Cthulhu RPG, where his poison will insta-kill if it touches bare skin.
 * Fate Worse Than Death: Do anything bad to his children, Yig torments the transgressor.
 * Overprotective Dad / Knight Templar Parent: Yig loves his snakes. Just don't do anything to them.
 * Swallowed Whole: Also from the Call of Cthulhu RPG.

Y'
Trapped behind some wall somewhere, the Defiler is the Old One of Squick. His earthly manifestation is that of a fat, headless body with mouths on its hands. Typically seeks out closet perverts, offering them to become his servants in exchange to experience their sick desires.
 * Brown Note: Merely reading his name in the right context is enough to summon him.
 * Complete Monster: Inasmuch as an utterly inhuman alien being can be.
 * Depraved Omnisexual: Implied, although this may be a way of satisfying the needs of his respective hosts.
 * Did You Just Romance Cthulhu?
 * Fat Bastard: In his "human" form.
 * God of Evil: Because those with hidden deviations and obsessions are easier to control, he has essentially adopted the role of their god.
 * I'm A Humanitarian
 * Manipulative Bastard
 * Memetic Molester: And then some.
 * Power Palms: It's mouths are on it's palms, which consume people.
 * Serial Killer: Gravitates toward these.
 * Speak of the Devil: In some cases, simply reading his name is enough to summon him.
 * Squick: In-universe example. It's telling that not even the servants of Cthulhu will talk about "the Violator".
 * The Unfettered: He will, quite literally, do anything to escape his prison.

Zushakon
A winged humanoid of the Great Old Ones, who hates light. For the Mutsune tribe of California, it is a god of Death.
 * Dark Is Evil: It really hates light, and is always accompanied by darkness.
 * Enemy to All Living Things: It's cursed bells drives anyone - humans and animals alike - in close proximity to insanity.
 * For Doom the Bell Tolls: Literally with the titular "The Bells of Horror" by Henry Kuttner. When those bells ring, it summons Zushakon.
 * Gods of Evil
 * Ultimate Evil: It is never seen, either because it's too dark... or people have already clawed out their eyes.

Bast
Based of the mythological goddess of the same name, Bast is the Elder God of Cats. Was classified as Elder God in the Call of Cthulhu, since Lovecraft was rather fond of felines. Bast was also used in several Mythos tales by Robert Bloch. The story of The Cats of Ulthar is also ties to her in the Call of Cthulhu. For further details, check out the Egyptian Mythology Character sheet.

Hypnos
Another deity appropriated from Mythology, this time from Greece. Listed as an Elder God of sleep in Call of Cthulhu, and as such Lord of Dreams. Other than that, little is known of this being.
 * Depending On the Writer: Hypnos being an Elder God comes from the Call of Cthulhu game. The original short story is told from a questionable perspective, so it's not clear if Hypnos even existed.
 * Calling Card: Apparently leaves behind statues of himself.
 * The Ghost: In Lovecraft's short tale "Hypnos", the character's friend fears something that the narrator or reader never sees. In fact, Hypnos is almost never depicted in any artwork, except only as a marble bust.
 * Pillar of Light: If for some unknowable reason a dreamer attracts his attention, Hypnos will seek that person out, and pull them up in a golden light.

Kthanid
Brother of Cthulhu. Visual appearance is like that of Cthulhu, but only with golden, peaceful eyes. A controversial subject in the Mythos, as he's clearly depicted as being good in a universe filled with alien, amoral beings.
 * Big Good: The main issue why he's disliked.
 * Eye Beam: Call of Cthulhu sorcebook Malleus Monstrorum claim it's his main attack.
 * Good Counterpart: to Cthulhu.
 * It's Personal: Bears a special grudge against the Great Old Ones, since they killed his mate and offspring.
 * Palette Swap: Except for the eyes, there's no physical difference between Kthanid or Cthulhu.

Nodens, AKA The Lord of the Abyss
Named after an obscure Celtic deity, Nodens is unusual in that his main apparition is an old man. Apprently a great hunter, seeking out the servants of the Great Old Ones. Typically seen riding in a seashell chariot drawn by fantastic beasts. Opposes Nyarlathotep.
 * Anti-Villain: Described as almost friendly to the humans he speaks with. He also apparently has a strong dislike for Nyarlathotep.
 * Cool Old Guy
 * Egomaniac Hunter: He hunts the servants of Nyarlathotep and other horrors. But not because Nodens cares for humanity, but because the Great Old Ones provide the best sport.
 * Humanoid Abomination
 * Shout-Out: To The Great God Pan, where the name Nodens is briefly mentioned.

Vorvadoss, AKA The Troubler of Sands
Lesser known Elder God who appears in the writings of Henry Kuttner. Sometimes appears as a cloaked, hooded being, enveloped in green flames, with fiery eyes. He may otherwise appear as a misty, silvery being with an inhuman face.
 * Alien Geometries: Vorvadoss' body seems to follow an alien pattern.
 * Dissonant Serenity: As alien and disconcerting Vorvadoss may appear, people around the Kindler of Flame feel a wave of assurance in its presence.
 * Monochromatic Eyes: Eyes dark as space.

Byakhee
Beings that live in interstellar space, noted for their "great wings". Capable of traveling interstellar distances, they can be summoned to be used as transports. Just remember to take some Space Mead or a space suit, since you still need some sort of protection against the cold vacuum. Servitors of Hastur.
 * Batman Can Breathe in Space: The Byakhee can. Not necessary the people they carry.
 * Giant Flyer
 * The Library of Babel: At the Fungi From Yuggoth Call of Cthulhu supplement, the Library of Celaeno is infested with Byakhee, who make sure no one smuggles out any books.
 * Speak of the Devil: Mentioned in the 1980 Dungeons & Dragons Deities and Demigods Cyclopedia, that Hastur sends Byakhee to kill whoever speaks his name.

Colour Out of Space
Creature from outer space, whose visible manifestation is a unknown hue. Contact with earthly life leads to ... terrible fates.
 * Came From the Sky
 * Energy Beings: An early example.
 * Fictional Color: When heated in a spectroscope, a meteorite that carried the Colour "displayed shining bands unlike any known colours of the normal spectrum". A globule inside the meteorite and vegetation grown in the area where the meteor fell also display the non-spectrum colors. The Colour monster itself is made up of these colors.
 * Fisher Kingdom: The Blasted Heath, which was once a farm before everything began to mutate and turn into grey dust.
 * Not of This Earth
 * Science Cannot Comprehend Phlebotinum: Scientists studying the meteorite that the Colour comes down from are baffled by its properties.
 * Starfish Aliens: Considered the most alien of all of Lovecraft's creatures. While some physical information and effects on Earthly life are known, nothing about the intentions or purpose of the Colour is. It's not even clear if the creature is intelligent or not.

Cthonians
See Great Old Ones: Shudde-M'ell

Dagon/Deep Ones
A giant, ocean-dwelling being. One of the less actively malicious beasties - apparently wants some peace and quiet more than bringing the world to an end. Not that that's going to help you if you accidentally enter his domain, though. Progenitor of the Deep Ones, a similarly isolationist underwater civilization of fish-people with a certain... interest in humanity. Physically, Deep Ones are humanoid, a cross of fish and frog, with grey-green skin, white bellies, webbed paws, and gilled necks.
 * Body Horror: The below-mentioned hybrids start out seemingly human. And then, after a few years, they start to mutate...
 * Cult: The Esoteric Order of Dagon in Innsmouth, which the humans collaborators of the Deep Ones use in worship and controlling the town.
 * Face Full of Alien Wingwong
 * Fish People: The Deep Ones.
 * Giant Swimmer: Dagon and Mother Hydra.
 * Half Human Hybrids: His "children" the Deep Ones, can mate with humans to produce these. They can also procreate with dolphins to create hybrids.
 * Immortality: Can live forever, barring violence or accidents.
 * Kraken and Leviathan: Dagon and his mate, Mother Hydra.
 * Our Mermaids Are Different: In-universe, the Deep Ones inspired the mermaid myth. The problem is, the reality is far more horrible.
 * Slow Transformation: Deep One Hybrids, changing throughout their life.
 * Town With a Dark Secret: Innsmouth.
 * Underwater City: Several, such as the city of Y'ha-nthlei.

Elder Things, AKA Elder Ones
Aliens that once colonized Earth billions of years ago. They developed a highly advanced civilization, and they accidentally lead to life arising on Earth in the process of creating the shoggoths. They're described as a barrel-shaped body with a starfish-like head and feet. Featuring radial symmetry, they have five eyes, tentacles, wings, feeding tubes, and brain lobes.
 * Ancient Astronauts
 * Advanced Ancient Acropolis: The city in the "Mountains of Madness".
 * Batman Can Breathe in Space: Subverted, the Elder Things could travel through deep space, but only by absorbing "certain chemicals".
 * Bizarre Alien Biology
 * Heroic Neutral: Long gone, for the most part, by modern times, but their enemies coincided with many of those that now trouble humanity. The narrators of the story in which they appear even compare them to human beings.
 * They're also the only inhuman race Lovecraft portrayed with any kind of sympathy, explaining the frenzied murder of the researchers in At The Mountains of Madness as a hysterical reaction to unknown circumstances.
 * Made of Iron: Capable of living under deep sea pressures.
 * Plant Aliens: More like half-plant, half-animal aliens.
 * Precursors
 * Starfish Aliens: Literally in this case, with the Elder Thing's radial physiology and starfish-shaped heads, though they are some of the more comprehensible aliens in the mythos.
 * Vestigial Empire: After Shoggoth rebellions, wars against Cthulhu's spawn, the Great Race, and the Mi-go, and the cooling of Earth, the Elder Things are reduced to this.

Fthaggua
Described as a sphere of blue-flame, Fthaggua is similar to Cthugha. However, where as Cthugha is imprisoned, Fthaggua is free and riding across the universe on the comet Ktynga. He is served by his Fire Vampires, which appear as red lighting. It's unknown if Fthaggua is a Great Old One or not, also if it has any relation to Cthugha.
 * Hive Mind: Fthaggua and his Fire Vampires are described as such.
 * Older Than They Think: The term Fire Vampires were first used for Fthaggua's servitors. Latter, Call of Cthulhu used the term to describe Cthugha's Flame creatures, and became the depiction that most associate with.
 * Our Vampires Are Different: A radical example, although the basic synopsis is the same. Upon destroying a victim (akin to spontaneous combustion), the Fire Vampires absorbs both the lifeform's energy and memories.

Great Ones
Weak gods of the Earth who reign over Earth's Dream Land. Not even remotely powerful as the other Ancient Ones, although they are still worshiped in the Dreamlands. They appear to be similar to humanity, and distinguished by certain facial features. For whatever reason, the Great Ones are protected by the Other Gods, which include Nyarlathotep. Not to be confused with the Great Old Ones.
 * Big Fancy Castle: Their home on Kadath.
 * Deface of the Moon: Carved on the hidden side of Mt. Ngranek is a portrait of the Great Ones. It proves to be an important plot point in The Dream-Quest Of Unknown Kadath.
 * Do Not Taunt Cthulhu: While one can trick or go against the wishes of the Great Ones, the Other Gods will reek their vengeance in retribution.
 * Have You Seen My God?
 * I Just Want to Be Normal: Maybe. In The Dream-Quest of Unknown Kadath, Nyarlathotep tell Randolph Carter how Great Ones are want to abandon their godhood and living as normal humans in waking world.
 * Interspecies Romance: The younger Great Ones tend to go down to Earth in disguise and take human women as wives.
 * Physical God: Rather limited ones at that, capable of being tricked by a mortal who is wise enough.

Great Race Of Yith
A highly intelligent race that lived on Earth long before humans. Their bodies consist of fleshy cones with four tendrils (two ended in pincers, one a mouth and one a pair of eyes) sticking out of the top. They ruled a portion of the Earth that includes what is now Australia when Cthulhu was active. They use psychic powers to leap from body to body across time. Their society is described as socialist and placing a high value on individual intelligence. The Great Race of Yith is wiped out in a war with the Flying Polyps, but will be re-created in the future thanks to their time-traveling powers. Yithians come across as the closest thing to a "good" race out of the original Lovecraft critters.
 * Badass Bookworm: one of the more (conventionally) intelligent races in the setting, and the Mi-Go and the Star Spawn of Cthulhu respected them.
 * Bizarre Alien Biology: not unexpected considering the setting. They also reproduce by spores....
 * Grand Theft Me: Usually combined with the mental time travel mentioned below. Can be temporary for research purposes or permanent.
 * Inferred Holocaust: The bodies most commonly associated with them? Those belonged to beings native to Earth before the Yithians used their mind-swapping powers to leave their own dying world for ours...
 * Laser-Guided Amnesia: Before reversing a temporary body swap, the 'guest' mind is stripped of its memories of its stay with the Yithians. As Professor Peaslee (of "The Shadow Out Of Time" fame) will attest, the process isn't always quite 100% effective.
 * Lightning Gun
 * Psychic Powers
 * Shock and Awe: The main weapon of the Yithian armies is a lighting-shooting device that looks like an old camera.
 * Time Travel: Of the mental variety, and the source of the appellation "Great Race," as they were the only species to master it.

Ghouls
Cannibal humanoids with rubbery skin, bony claws, and dog-like faces. They tend to live underground, lurking near graveyards.
 * Changeling Tale: Ghouls are also known for kidnapping babies and replacing them with ghoul babies. Don't worry though, they just teach the abducted children how to become ghouls.
 * I'm a Humanitarian: Played with, the Ghouls are known for eating corpses. Although sometimes, they do attack people.
 * Good All Along: Although presented as horrific, they are sometimes presented in a positive light, being loyal and helpful to some. Considering the Mythos being filled with unspeakable, apathic horrors, Ghouls are one of the nicer species one can encounter. If one knows their language...
 * Grave Robbing: The Ghouls probably call this "Grocery Shopping".
 * Our Ghouls Are Creepier
 * Tome of Eldritch Lore:: The Cultes des Goules, which presumably dealt with Ghouls and their cults.
 * Tunnel Network
 * Was Once a Man: Hanging out with Ghouls long enough can transform a human into one.

Hounds of Tindalos
Creatures from the primordial past that are capable of traveling through time. They are only able to enter our dimension through angles.
 * And Man Grew Proud: Due to some unspeakable act in near the primordial past, the Hounds became “foul” while normal life remained “pure”. The event itself was forgotten, but the myths such as The Fall from Genesis are allusions to this event.
 * Alien Geometries: The Hounds are descended literally from angles. All natural life (including humans) are descended from curves. As a result, the monsters can enter anywhere and anytime there are angles. The only way to hide from the beasts is to be in a totally curved room.
 * Clock Roaches
 * The Ghost: The Hounds are never seen in the original story they debuted. They're only described as "hungry" and "foul" by one of the characters.
 * Hell Hound: Described as this, but more for their ravenous, relentlessness hunger than for their physical appearance.
 * Immortality: Theoretically they have Biological Immortality, since no enzymes exist within the bodies of the Hounds.
 * The Juggernaut: Once they catch the sent of someone, they will keep on hunting until they get their target.

Insects from Shaggai, AKA Shan
Extraterrestrials that worshiped Azathoth. Although highly advanced, this species was also extremely decadent. The Shan are about the size of a pigeon, with leathery wings, large lidless eyes, ten legs with tentacles, six brain lobes, and three mouths.
 * Asshole Victim:
 * Cold-Blooded Torture: As a form of ritual or entertainment.
 * Futuristic Pyramid: The Insects' conical-shaped temples to Azathoth, which are not only capable of teleportation, but also have gateways that allow direct contact with "The Demon Sultan".
 * Intangible Man: Because of their affiliation with Azathoth, the Insects are able to phase through organic matter.
 * Mass Teleportation : The Shan are well versed in teleportation technology, capable of transporting their temples across interstellar spaces.
 * Oh Crap: Twice, often after discovering something disturbing on a planet they visited.
 * Puppeteer Parasite: With their phasing abilities, and in combination with their psychic powers, the Shan are able to infest and dominate humans.
 * Slave Race: The Xiclotl, tall, meat-eating creatures, which the Shan conquered.
 * Telepathy
 * Tome of Eldritch Lore: the Massa di Requiem par Shuggay, an opera that tells of the Shan's travels. It's also impossible to perform, since
 * Weakened By the Light: Sol's electromagnetic radiation has an averse affect on the Shan's metabolism.

Mi-go, AKA Fungi from Yuggoth
Crab-like fungi aliens that come to earth for mining.
 * Batman Can Breathe in Space: Some subspecies.
 * Brain In A Jar: How other subspecies that can't breathe in space travel. Also fond of doing this to humans.
 * Cool Gate: The Devil's Steps in the Severn Valley houses a portal to Yuggoth. Fortunately, a human can use the gate as it reconfigures the traveler to survive it's destination. Unfortunately, Pluto houses things far worse than Mi-go...
 * Grand Theft Me: They sometimes implant the brain of one of their kind in someone's skull.
 * Hive Caste System: At least one sourcebook for the RPGs divides the Mi-Go into three castes: warriors, workers and scientists.
 * Lightning Gun: In the role-playing supplements The Stars Are Right! and Terror from the Stars describe the Mi-go as having Electric Rifles.
 * Multiversal Conqueror: Potentially.
 * Organic Technology: The Call of Cthulhu RPG has them using this.
 * Plant Aliens: They seem to be made of some kind of fungus.
 * That's No Moon: Call of Cthulhu sorcebook Malleus Monstrorum mention how Mi-go harvest flesh of the Outer God Ubbo-Sathla and use it to construct bio-mechanical super weapon capable to travel through time and space, the living moon Charon AKA Pluto's moon.

Nightgaunts
Thin, black humanoids with large wings, rubbery skin, and barbed tails. They are the servants of Nodens, and Brian Lumley had associated them with Yibb-Tstll.
 * Based On a Dream: A nightmare Lovecraft had inspired these creatures.
 * The Blank
 * Giant Flyer: Nightgaunts tend to carry people away, and drop them in unwanted places. The Ghouls can also use them as mounts.
 * Horrifying the Horror: Nightgaunts has this effect on Nyarlathotep's servants.
 * Our Gargoyles Rock
 * Tickle Torture: Using their barbed tails, they tend to do this to the people they capture.

Shoggoths
Monstrous creatures bio-engineered by the Elder Things. They are massive, amorphous, with eyes floating on its tar-like body, and emits green light. They are able to create organs at will.
 * Blob Monster
 * Dumb Muscle: Meant to be living construction equipment/servants.
 * Extra Eyes
 * Servant Race: Shoggoths were created to be beasts of burden for the Elder Things. Also, they tend to be used as servitors by the Great Old Ones or human cultists.
 * Turned Against Their Masters
 * Partial Transformation: Shoggoths are versatile shapeshifters, able to create any organ they need. However, the ability seems limited, as most Shoggoths appear to be a horrendous mesh-mash of organs and black goo.
 * Squick: An in-universe example for Alhazred, who would not even mention Shoggoths unless he was high on drugs.
 * Voluntary Shapeshifting: Shoggoth Lords are capable of doing this, able to imitate human beings.

Shantak
Elephantine bird-like creatures with scaly slimy skin, bat wings, two talons, and horse heads. They can be used as steeds, and serve Nyarlathotep.

Star Vampires, AKA Shamblers from the Stars
Monsters from outer space that hunger for blood. If they're seen (never a good sight), they're a gelatinous mass with a huge mouth and talons, covered in trunk-like tentacles - each one ending in a sucker.
 * Giggling Villain: It's presence is marked by mocking giggling sounds.
 * Invisible Monsters: Totally invisible...
 * Invisibility Flicker: ... until they feed.
 * Our Vampires Are Different: Different form, but the basic principle is the same.
 * Tome of Eldritch Lore: The De Vermis Mysteriis, or "The Mysteries of the Worm". Written by Ludwig Prinn (a 15th century sorcerer), the book contains the secrets of summoning these creatures.

Tcho-Tcho
"Abominable humanoids", short and hairless, who serve the Great Old Ones. Their abode is in Burma, on the Plateau of Tsang (which is also an extension of Leng). ""... the nastiest people who ever lived ...They'd been living way up in those hills I don't know how many centuries, and whatever it is they were doing, they weren't going to let a stranger in on it"."
 * Bald of Evil
 * Culture With A Dark Secret: In T.E.D. Klein's "Black Man With A Horn", a missionary goes to investigate the group:


 * Half Human Hybrids: Descendants of humans who mated with the Miri Nigri, a species of dwarfs made from amphibian flesh by Chaugnar Faugn.
 * Insanity Immunity: Call of Cthulhu has their SAN halved at birth, and it only gets worse from there.
 * I'm a Humanitarian
 * Our Gnomes Are Weirder
 * The Triads and The Tongs: Having migrated to America, the Tcho-tchos had created crime syndicates to continue their "traditions".