Monster Girl Encyclopedia

Imagine your typical RPG-style fantasy world, filled with monsters and adventure.

Now replace all of said monsters with Cute Monster Girls, and throw in huge amounts of Fan Service and outright sex. The Monster Girl Encyclopedia is Exactly What It Says On the Tin, a bestiary dedicated to cataloging all the different kinds of Cute Monster Girls in the world. Naturally, the entries are filled with Fetish Fuel, and most are Not Safe for Work.

A compilation of translated entries for the Encyclopedia canon can be found here(needs registration in order to view the contents). New monster species are being added all the time by the original creator, and so the list linked above is not complete yet. Just go to either Danbooru or Gelbooru for the newest additions to the list ( which may not even be translated into English yet). A new -booru has opened recently thanks to the Monster Girl Unlimited staff: MonsterGirlbooru

Also see Living With Monster Girl for a Doujinshi series with similar content.
 * WARNING: The -booru sites contain NSFW material! Do not browse with touchy relatives present. ;)
 * Kenkou Kurosu/Cross, the artist's, page can be found here.
 * Monster Girl Unlimited: The Group responsible for creating the English Translated Profiles. Also acts as a Fan Community. Requires registration to view.
 * Another much-smaller attempt at an Encyclopedia from apparently the same artist as the Living with Monster Girls series.
 * An alternate site is here: http://mjm202036.pbworks.com/Monster-Girls-Encyclopedia

!!This work provides examples of:


 * Abuse Is Okay When It Is Female On Male: The Ogre is stated as literally beating her partner into submission so she can carry him off in the first place, then beating him while having sex with him, and beating him even harder if he tries to fight back. The Amazoness demands her husband stay in the kitchen "where he belongs" and will force him to service her sexually in public so she can show off that she's the dominant party. The Dark Elf, meanwhile, is a dominatrix who regards men as nothing more then sex toys.
 * Albeit the same information on the ogre refers to these beatings as resulting in a great deal of pleasure for the man, which implies it may be a euphemism/mistranslation/confusion for rough, passionate sex. Further, background information claims that even monsters that refer to their men as slaves or prey still treat them in a loving manner.
 * A Form You Are Comfortable With: Doppelgangers. They shapeshift into an ideal form of the woman loved by the man they love.
 * Alchemic Elementals: All four of them are featured as monster girls. Except Salamander is replaced by Ignis, but later on Salamander was added to to encyclopedia as a subspecies of the Lizardmen girls.
 * All Women Are Lustful: Best case scenario. Some are not so much lustful as they are hungry.
 * A Man Is Not a Virgin: Almost certainly not in this world. If he does subvert it, he'll have horny Unicorns trying to get him to become their husband.
 * Alice Allusion: For one, there's Alice-type succubi, the artwork for wererabbit also has her carries a large pocket watch. There's even a bit of dialogue in the book about this.
 * In addition, the Alice emits a pheremone that makes men rape her, forcibly turning them into Lolicons. This, and her appearence as a young girl, is possibly a reference to rumors of Lewis Carroll being a Lolicon himself.
 * Wererabbits can teleport their husbands to the Wonderland.
 * The Alice likes to chase after and play with Wererabbits.
 * All Amazons Want Hercules:
 * Orcs and Ogres are abusive toward their male slaves, but beat one in combat or during sex and she will become an obedient wife/slave herself. More pronounced with the Orc then with the Ogre.
 * Dragons have a tsun-attitude toward their husbands at first, treating them as precious treasures and won't let them out of their sight. They become full dere when they recognize the man as a "stronger male".
 * Lizardmen, a Proud Warrior Race Girl, will propose marriage to whoever beats them in a duel. And they won't give up even if the man refuse.
 * Baphomet, the most powerful demon-beast, while she turns men into Lolicon regardless of their strength, she only accepts one who beat her in combat as husband.
 * Averted by Amazoness though.
 * Ancient Egypt: We've got the Anubis, Sphinx and Mummy.
 * Anything That Moves: It's mentioned that zombies can't distinguish a man from a woman, and so they'll pretty much violate both indiscriminately.
 * The Archer: The Elf and Centaur
 * Art Evolution: There's quite a difference between the earliest entries and the newest, and quite a few versions have actually been redone graphically, sometimes with very visible changes (the Lizardman, for example, got shorter, got more detailed armor, had her hands changed into more bestial paws, and got bigger breasts).
 * Atlantis Is Boring: Averted. Aquatic monsters are as lustful as those on land. And Sea Bishops can transform any man so he can live in ocean freely, though they only do this to either aquatic monster's husband or drowning guy.
 * Author Appeal: The artist seems to love Horny Devils, considering how many monsters have been corrupted by them. And let's not forget the number of monsters that convert other women into their species, or the number that can be turned into more submissive versions...
 * And the fact many of them want to rape you
 * Baby Got Back: Werecat, Scylla, Kappa, Orc, and Girtablilu
 * Bee People: The Honey Bee
 * Beware the Nice Ones: Jurogumo is sweet and harmless during daytime, but at night she will turn into a sadistic rapist who invariably completely breaks her husband's will.
 * BBW: Orc.
 * Blessed With Suck:
 * You're a man in a magical land full of Cute Monster Girls that are, presuming they find you attractive, are all willing and eager to have sex with you? Sounds fun, except some of them can be less then attractive unless you're into the fetish they represent, many of them aren't very big on the concept of "No", and pretty much all of them are very possessive. But then again. Rape Is Ok When It Is Female On Male.
 * Plus, if you happen to have an abundance of spiritual energy, you're an extremely powerful person or a mighty wizard... and you're going to draw eager, hungry monsters like iron fillings to a magnet. Irregardless of your attraction to them or desire to attract them.
 * If you're a woman in this world, you can be turned into a Cute Monster Girl, gaining supernatural charm and beauty (along with other abilities). Unfortunately, not all of the potential transformations you can undergo are neccessarily attractive to you (Roper and Dark Slime particularly), your personality changes when you are transformed (though there's a bit of a Broken Base on exactly how much is changed. See Draco in Leather Pants in the YMMV page) and, worst of all? Most of the monsters won't ask your permission first.
 * Blind Idiot Translation: The man whose translations are used in the majority of the edited profiles left the word "monster" as "mamono". It's not like he was trying to make it so English-speakers could understand it.
 * Still, the word has since become used in the fandom not as Engrish, but a word to actually refer to Kenkou Cross's Monster Girls.
 * Blood Knight: The salamander. She doesn't care really if you win or lose when you fight her, so long as you can give her the most enjoyable fight possible and prove to be her most worthy adversary she'll follow you to the ends of the Earth declaring her love for you until you agree to be her husband.
 * Blue Eyes: The Yuki-Onna has a stunning pair.
 * Boobs of Steel: The Amazons entire culture revolves around this.
 * Lizardmen and Orcs, meanwhile, are races whose culture emphasizes combat and fighting and who are both fairly buxom (especially after her artwork upgrade, for the former). The Minotaurus and the Red Oni aren't quite as busty as any of them, but they are super strong.
 * But averted by Baphomet who is stated to have the most strength of all the monsters.
 * Bottle Fairy: The Red Oni lives to party and spends most of her life drunk or drinking.
 * Boy Meets Ghoul: It's possible to develop romantic relationship with many monsters, assume that she isn't one of those who will just going with rape.
 * Taken to punny/literal levels with the release of the Ghoul monster.
 * Broken Bird: Most men who get raped by Jurogumo will have their will completely shatterred.
 * But You Screw One Goat: How one mates with a Centaur wasn't made clear until the first book was published, leading some to believe you mate with them like a horse. The bonus art for the Centaur shows her just having finished playing with her lady bits.
 * Actually, this is still somewhat debated. Her hands are covering her lower body in the picture, so it isn't quite clear what's down there. She only has an embarrassed look on her face because someone is riding her.
 * Career Killers: A subversion with the Mantis. They don't kill for money, but they are highly efficient hunters, nicknamed "Assassins of the Forest"
 * Catgirl: The Werecat monster. Giving her catnip results in her raping you. Now in Ancient Egypt flavour with the Sphinx. And now in Japanese Flavour with the Nekomata.
 * Chest Monster: The Mimic and Pot Devil are Cute Monster Girl embodiments of this. They pretend to be, respectively, a chest or a large pot, hiding in a pocket dimension within, but any man who messes with it is promptly "attacked". The Mimic pops out and uses magic to get the man to have sex with her, taking him back into the chest if she really likes him, while the Pot Devil sucks him into the pot to have sex. Stick something into the Mimic's keyhole, or toss something into the Pot Devil's jar, and they'll leap out of their home and be helpless.
 * Wouldn't all the Monster Girls count as chest monsters?
 * The Charybdis is counted as a Mimic too for a Mimic is any living creature that imitates an inanimate object. Since the Charybdis masquerades as a crater, she applies.
 * Clingy Jealous Girl: The Lamia and Medusa entries are noted to be quite possessive.
 * The Charybdis doesn't take kindly to Scylla scooping up men she's dragged, or dragging, down beneath the waves. They're too timid to actually confront Scylla about this though.
 * Corrupt the Cutie: Sorry, Chaste Hero. No matter how negative your view on sex is, get demonic energy injected to your body will turn you into sex maniac monster girl or incubus. Followers of the Fallen God are especially enjoy corrupting chaste persons, including angels, more than usual.
 * Downplaying by Alice succubi. They can't remember anything about sex, so their mindset remains as innocent children. Their bodies, however, will be more responsive after each sexual encounter. It may play straight on their husband though, those who just have strong Big Brother Instinct will slowly turn into Lolicon because of her charm magic. If an Alice is taught about sex, she doesn't act much differently than a regular Succubus.
 * Counting Sheep: The Weresheep has enchanted wool which makes those who come in contact with it drowzy.
 * Covered in Gunge: The various slime monsters' preferred method of catching men.
 * Covert Pervert: The Charybdis looks like a shy little girl in a vaguely organic crater, but she is perhaps the horniest girl in the MGE!
 * Not really. She is one of the horniest girls, and does act shy, but she's not really covert about it. She activly creates whirlpools that drag men down to her when she's horny.
 * She's still the only monster so far to actively try to enact gangbang fantasies. All of the others are monogamous.
 * Also the Sea Bishop, who doesn't even actively seek out a husband and only gets one when she has to transform him in order to save him from drowning, secretly takes notes from the couples she marries and, once she has transformed a drowning man, eagerly pounces him to try them all out with him.
 * Nightmare is a subversion of this. She appears as strong-willed and lustful woman to assault her victim in their dreams. The real Nightmare is extremely timid centaur who will get paralyzed simply by getting touched in reality. But, as time passes, she'll become less and less covert.
 * Cute Bruiser: The Goblin is a loli who happens to be several times stronger than a fully grown man.
 * Now in Oppai Loli variety with the Hobgoblin.
 * Cute Clumsy Girl, Dojikko: Hobgoblin. To quote her entry "However, perhaps because the enlarged portion of their bodies robs them of nutrients, they're often slower in the head than normal goblins. They're simpler than goblins, and perhaps because of the weight of their huge breasts, nowhere near as agile. When the goblins who formed a gang chase the man around, they're always the ones lagging behind. They're often observed falling down during the chase too.".
 * Cute Monster Girl: Goes without saying. The entire purpose of the Encyclopedia is to catalog each and every one, and considering the number of monsters in popular culture, it isn't even half done yet.
 * Cute Witch: The Witch entry, natch. And all of them are lolis.
 * Dark Skinned Blond: The Amazon, Dark Elf, Pot Devil, Girtabilu, and Dryad all have dark skin and light colored hair.
 * Death By Sex: Amazingly enough, totally averted; none of the Horny Devils will explicitly kill you.
 * Although, the stories state that a Slime girl will sometimes (if not usually) have sex with a man until he... expires.
 * The stories aren't canon, only what's in the actual Encyclopedia entries counts.
 * Additionally translated settings information from the author's website states that monster girls never kill their mates, as they need men to reproduce (and of course many genuinely love their husbands). The lamia may be an exception, but only if you cheat on her.
 * Imps steal the souls of men. It's not explicitly stated that "loss of soul" means death, though.
 * The "background articles" on the world explain that's more of a mistranslation issue than anything; the correct term is "spirit energy", which is what most demon types feed on. It's harmless to men, who replenish it faster and produce more than women, but women who lose all of their spirit energy and have it replenished with the monsters' demonic energy become monster-girls themselves.
 * Distressed Damsel, Standard Hero Reward : Subverted. Whenever there is maiden hold captive in dungeon, it's most likely to be Echidna in disguise, waiting for a strong man worthy to be her mate.
 * Elemental Embodiment: The Gnome (Earth), Ignis (Fire), Sylph (Wind) and Undine (Water) monster-girls. Also overlaps with Horny Devils, as they're also partially embodiments of pure "demon magic"; if they have enough sex, they become "corrupted" and start broadcasting it, transforming all the men and women within miles of them into incubi and succubi.
 * The Dark Matter was retconned into a Darkness Elemental.
 * Maybe this means a Light Elemental is on the way?
 * The Salamander was considered this, before the Demon Magic caused the creation of the Ignis.
 * Elves Versus Dwarves: Even the ones that have been turned into succubi tend to snipe at each other and fight over men.
 * Empathic Shapeshifter: Doppelgangers. Affection-based. See A Form You Are Comfortable With
 * Enthralling Siren: A kind of harpy with a beautiful singing voice. They share similar traits with other harpies.
 * Erotic Eating: A subversion with the Ghoul. Her mouth has evolved sensitivity to the point of being considered a sex organ all on it's own, so anytime she puts something in her mouth is either masturbation or sex.
 * Everythings Better With Cows: Holstaurus. To quote her entry "She, even as a child, develops nutritious milk. This milk increases the amount of spirit a man has, and promotes great health. This is of great demand among monsters, in order to make their husbands stronger and healthier, and sells very quickly, even among humans. She produces enough milk, that two people can live off of it alone.".
 * Everythings Squishier With Cephalopods: The Scylla.
 * Everythings Worse With Bears: The grizzly monster. Might avert this seeing how shes a cute Bear Girl.
 * Face Full of Alien Wingwong: Some (most) monsters both avert this and play it straight. The same concept, an alien forcefully using a defenseless human to mate.
 * More like Inverted Trope - they do rape people, but because its Female On Male, the action goes the other way around.
 * Fairy Sexy: Pixie. Other kind of fairy should be count, though they are all child-like.
 * Fallen Angel: What happen when angels get corrupted by succubi. At first it just twists their logic into thinking that sex is proper reward for good deed. They still think that they're doing holy work, rewarding good-doers with pleasure using their body. Eventually however, they will realize their own desire and fully transform into a dark angel.
 * Fallen Hero: Demon Lord's army has whole unit made up purely from this trope. Just like Fallen Angel above, these people were heroes who fail their mission to slay the Demon Lord. Men were charmed and women become succubi. The old comrades now reform their party under command of the Demon Lord. Although they're probaly the most powerful fighting force in Demon Lord's army, the former heroes are mostly too busy screwing their heroines and only seen in actual combat when it's serious threat. And the Demon Lord's husband is none other than the hero who slayed previous Demon Lord. But consider his motive, it's arguable if he's really fallen.
 * Fantastic Arousal: Many monster-girls, naturally, have extremely bizarre ways of turning them on.
 * Fantasy Kitchen Sink: Dragons, Mummies, Slime, Oni, Harpies, and that's just too get you started. All kinds of Fantasies.
 * Fantasy Pantheon: So far, we have The Chief God (who seems to based on the Judeo-Christian-Islamic one, Poseidon (who governs the ocean), and the Fallen God (who resides in Pandemonium).
 * Fetish Fuel: Takes it Up to Eleven.
 * The Dark Angel especially. She can actually learn her mates fetishes instantly during sex.
 * Fetish Fuel Station Attendant: Far, far too many to count. Dark Angel literally so, see above.
 * Fiery Redhead: The Ignis is not only this, she's literally on fire.
 * The Salamander, especially if you give her a good fight.
 * Fisher Kingdom: The Demon Realm. It's full of demonic energy, so anyone inside will become more lustful over time. And the way a woman's spirit energy works, she naturally draws in energy from her surroundings when she expends it doing anything from fighting or casting magic to just breathing (as opposed to men and monsters, who can recharge from their own souls by eating and resting). When her spirit energy is completely depleted and replaced by demonic energy, she becomes a Succubus. Of course, by that point, she'll probably already be caught and transformed by a Succubus, a Vampire, a Dark Slime, a Dark Matter, or turned into a Roper after wandering into the Forest of Tentacles.
 * Gag Boobs:
 * The massively well-endowed Holstraurus uses her breast size as a form of communication. If she presses her breasts against you, it means she likes you. If she presses them against you firmly it means OH MY GAWD I WANT YOU INSIDE ME NOW! They can even change size.
 * Hobgoblin is inferior to normal Goblin in every way except strength. They're The Ditz and Dojikko, yet ordinary Goblins will follow them around because they think "bigger breasts are amazing".
 * Gender Bender: Undead monsters are always female. No matter what gender the living body used to have. The more self aware ones will even have warped memories: you might remember your best friend from when you were a guy as a lover.
 * The Alp is a Succubus that was once an Incubus. A Homosexual Incubus. Their desire to be with a man was so great, they (sub)consciously transformed themselves into a monster-girl.
 * Golem: The ones appearing in the Encyclopedia are made as statues with the forms of attractive women, though more mundane golems are mentioned in their entry. They have the unusual trait that, should a golem fall in love with a man, she will remove the control runes by herself and then rewrite it to ensure her lover becomes her new master.
 * Gorgeous Gorgon: The entire Encyclopedia probably qualifies, but the Lamia, Medusa and Echidna are the most literal examples.
 * Horny Devils: Not only is there the basic Succubus, there's also multiple different variants. The Alice is a mutant Succubus that looks and thinks like a pure and innocent young girl, but she exudes a mind-warping aura that eventually causes any man too close to lose his mind and rape her -- despite the fact she doesn't want him to or even really desire sex of her own. For added insult, after the sex, she forgets all about it even as her body is restored to its virgin state. The Amazoness is basically a Hot Amazon Succubus with an appearance that invokes Nubile Savage and who lives in a society that is one part Boobs of Steel to one part Amazon Brigade. Dark Priests are Succubi-like demons that attempt to convert men to worship of the "Fallen God" through preaching and sex, dressing up in sexy nun outfits to boot. Imps aren't Succubi, but have adopted the same approach despite their childish appearance.
 * A considerable number of the creatures in the Encyclopedia are either being influenced by Succubus magic (Elves, Angels), or were outright created by it (Dark Elves, Dark Angels).
 * On the other end, Lilim (who are the direct biological children of the Demon Lord) are basically super-succubi, able to do all of the things that other succubi can on the mere virtue of being damn sexy (no magic or effort required). However, they somehow also inherit their mother's preference of monogamy.
 * Hot Amazon: The Amazon, obviously.
 * Hourglass Hottie: Orc, Holstaurus and Gnome.
 * Ho Yay: Inverted with the Alp. They used to be Homosexual Incubi, but they wanted to be with men so much, it caused them to forcibly Gender Bend themselves.
 * Human Mom Nonhuman Dad: Inverted. Most of the monster races depend on human males to reproduce. The background material proclaims that this inversion is the core of the current Demon Lord's plan for peace; though she doesn't yet have enough power to make human/monster-girl couplings produce anything other than more monstergirls, she intends to make it so that they give birth to human sons as well. In essence, humans and monsters will become different sexes of the same race.
 * I Am Legion: Slime Queens, who need to produce slimegirl-like subunits because they're too large and slow, and will sometimes grow to resemble large villages of slimes (even trading with other villages!). Needless to say, woe to any man in their sights.
 * Interspecies Romance: A rather explicit (and not neccessarily consensual on the male side) version, but the basic principle behind the setting.
 * Jekyll and Hyde: The Jurougumo. During the day? The sweetest, nicest girl you could hope to meet. At night? A sadistic, raging, rape-happy nymphomaniac.
 * Technically the Holstaurus as well. Ordinarily sweet, gentle and placid, they become savage, brutal and as lusty as their Minotaurus cousins if they keep looking at the color red or go too long without sex.
 * Jerkass Gods: The Chief God really loves humans, but his hatred of monsters only serves to justify the extremism of the new Demon Lord. He's apparently unwilling to accept that monsters aren't the same as they were under the original Demon Lord, and may or may not have created them with the intent of having an enemy for mankind to fight. On the other end of the spectrum, the Fallen God takes the new Demon Lord's philosophy Up to Eleven (or rather, was apparently retconned into fulfilling the Demon Lord's original role). He/she/it believes in pleasure above all other things, and forcefully converts both human women and angels into its followers the same way as a succubus, causing them to desire the ultimate "reward" of being locked in eternal coitus with their mate in Pandemonium.
 * The cyclopes were once deities, but fellow deities cursed them into monster simply because they have only one eye.
 * Translations of the official background material have also shown that Poseidon (who is a goddess in this setting) turned against the other gods and sided with the demon lord in part at least because the other gods were forcing her to make storms to reduce human populations and make them fear the sea.
 * Kimono Fanservice: The Yuki-Onna and Inari look great in their kimonos, but the Jurougumo and Youko look drop-dead sexy.
 * Knight Templar: The Order. In order to prevent mankind from falling to corruption, and to keep them from going extinct due to the flaws in interbreeding, they make it their business to kill monsters and launch invasions into the Demon Realm. They make no effort to spare the human "husbands" in the process, even if he was unwilling, and some sects actually perpetuate the myth that monsters eat the humans that they kidnap so that people won't sympathize with them. On the other hand, it's mentioned that the clergy itself and many followers act more like a Saintly Church, and a special note is made that they aren't the great evil that monsters and monster sympathizers think they are.
 * Kuudere: Mantis. She acts like The Stoic her entire life, until she gets her first man during their Mating Season. After her first time, she'll be as dedicated to loving her husband as she is to hunting for food.
 * Sahuagin counts too. She never shows any emotion and rarely speaks, but is loving and vocal during intercourse.
 * Les Yay: Considering the source material, surprisingly little. Most monster girls either ignore women or somehow turn human women into their own species, such as Vampires and Succubi . Then again, there's always fanart....
 * Giant Slugs and Zombies are, so far, the only monsters who will as happily have sex with women as they will with men. Although it's stated that the Zombies do so because they're typically too dim to really distinguish between the sexes, while Giant Slugs are responding to old instincts from their pre-Cute Monster Girl form, when they were hermaphroditic.
 * The "contagious" monsters tend to have some shades of this. Succubi are explicitly stated to transform women through sex acts (they drain spirit energy through sex, and a woman becomes a monster when her spirit is completely drained and replaced with demonic energy). The Dark Slime transforms women the same way she has "sex" with men (engulfing them and pleasuring their bodies), the Roper plants its seed through tentacle rape, and the Kiss of the Vampire is probably just as pleasurable for both the vampire and victim when it's used for converting women rather than feeding.
 * Lolicon: ...Way too many to count. The Alice is the one who best invokes this; she's sexually innocent, but will unconsciously charm male humans. At first, the man is merely compelled to act protective towards the Alice, but he will eventually assault her sexually. Once that happens, the Alice will revert back to a virginal state with her memory about the sexual encounter erased.
 * The Baphomets are loli-leaders of a cult of witches called a Sabbath. Witches are Lolis too. Therefore, they attempt to convert as many men as possible into Lolicons.
 * The Dark Angel is perhaps the best example. She is not only one of the most sex-crazed of all monsters, but she can actually learn about her partner's fetishes during sex.
 * Love Freak: Lilims are, just like their mother, want nothing more than have humanity and monster girls coexist in harmony of love...and sex. On personal level, each lilim seek one and only true lover to be her husband, despite has power to dominate as many men as she want. Subvert that they're currently the most powerful monster girls and very effective at spreading love, able to seduce men without effort and can turn women into any type of monster girl that's under demon lord's command.
 * Love Is in The Air: The Alraune and many other monsters use pheromones to attract men.
 * Love Redeem, Love Make You Evil: Demon Lord's husband is either of this, depend on you're asking. He was the great hero who slayed previous Demon Lord, but has doubt on why monsters and humans must keep fighting. When he meet his lover, the succubus that's current Demon Lord, they combine force to made the world as it is.
 * Loveable Sex Maniac: The Merrows are the most lustful member of the Mermaid family and they never cease thinking about sex. However, when a Merrow proposes marriage to her husband-to-be, she gives him her hat. Said hat is the Merrow's Power Source and she can't even swim without it (unless she gets spirit energy from her husband). In other words, she puts her life in your hands when she asks for marriage. You can't really hate such a girl, can you?
 * Mars Needs Women: Inverted. A Dark Angel who takes a liking to a man will bring him to Pandemonium. A Succubus will bring him to the Demon Realm. And a Fairy will take him to the Fairy Kingdom. A Wererabbit will take her husband to Alice's Wonderland.
 * Mermaid Problem: Averted, for obvious reasons. If you look hard, each mermaid-type monster has lines that resemble thighs just below their waist, where the fish tail join with girl body. The older art for mermaid doesn't address this problem though. The book's bonus art for the mermaid shows her genitals as well.
 * Moe Anthropomorphism: Enforced in-universe, and somewhat weaponized, by the Demon Lordâ€™s power. Originally, most monsters were the usual gruesome run-of-the mill men-eating monstrosities you find in most RP Gs. Their transformation into pretty girls was a vital part of the Demon Lordâ€™s plan to merge monsters and humans into a single species and enforce peace.
 * Moral Myopia: Both the Demon Lord and the Order are convinced of their own righteousness and that the other side is a force of pure evil. The Demon Lord's side is that the Order are a bunch of self-righteous puritans ruining her efforts to bring an end to a pointless war that the Gods created and forced upon both sides, as well as interfering with her efforts to gather enough power to improve the faults in her program, spreading blatant lies about her cause and murdering innocents who just happen to have found genuine love or simply sympathize with her cause. The Order's side is that the Demon Lord has functionally destroyed two humanoid races that were already on friendly terms with humanity, is looking to destroy a third, determined to rip human culture as it has always been apart, threatening humanity with extinction due to the "monster girls only birth monster girls" fact, cheapening love with her minions' abundance of mind-ensnaring magic and powerful natural aphrodesiacs, and her own efforts to paint smilies on everyone's soul are basically an attack on free will itself. To some extent or other, both sides are right.
 * Most Common Superpower: Most of the monsters, but the Holstaurus in particular. May overlap with Gag Boobs.
 * Mummy: Was there any doubt?
 * Naughty Nuns: The Dark Priestess is a Horny Devil whose whole shtick is that she preaches a "religion" proclaiming the holiness of regular sex and runs around in a fetishistic nun outfit. The Angel and Dark Angel kind of fit as well, given they are celestial beings who, particularly in the latter case, now live to have sex. There's also the Sea Bishop, a Mermaid-variant who has the fetishistic clerical uniform, but who is a loving, gentle and shy woman who performs the marriage ceremonies between humans and sea-dwelling monster-girls... which happen to involve the newlyweds having sex right there and then in front of the Sea Bishop (the act is combined with the sea bishop's magic to enable the man to live underwater), who secretly takes notes for when she finds herself a boyfriend...
 * Naughty Tentacles: The Scylla has these. And the Roper is (are?) these in the form of The Virus.
 * Dark Matter does this as well, similar to the Roper.
 * The Demon Realm has a location known as the Forest of Tentacles. It is, predictably enough, a forest made out of Naughty Tentacles, presumably the Roper's non-human-infested form. Succubi and other monsters often bring their husbands to the outskirts to use them as marital aids, though they are wary of going deep into the forest where the trees are more aggressive. A human woman who wanders inside will be raped until she's either turned into a Roper by the forest or a Succubus by the Demon Realm's natural energy, and she'll probably want to come back as often as possible even after she's released.
 * Nightmare Fuel: Invoked; the Nightmare monster can invade people's dreams this way.
 * There is also meta-contextual nightmare fuel: imagine living in a world where, if you are male, chance are very good that you'll end up being raped (with or without the loss of your soul on top of that) or being a sex slave to some monster, and if you are female, that you'll be turned into a monster.
 * The loss of one's soul was due to mistranslations and is not at all canon. Most monsters are looking for husbands, not slaves, and even those that call men slaves are stated to treat them like husbands.
 * Obake: Many entries, including Oni, Kappa, two kinds of fox-girls, Jorougumo and Yuki-onna.
 * One Gender Race: Every single monster race is all-female, although repeated sex with succubi family monsters (which includes vampires and dark angels) can turn a man into an incubus (which seems to just be a man with a monster-girl's lifespan and capacity for sex). In reality, all the monsters can do this, but those who feed off of spirit can do this much faster.
 * They weren't always either, but the current Demon Empress has put the world in its current state as part of her master plan.
 * Further alteration on it, recently it's been stated that all Monster Girls can turn their husbands into Incubi if they have sex with him enough (It just works alot quicker with Succubi-types).
 * Oral Fixation Fixation: Ghouls. Full stop.
 * Our Angels Are Different: If an Angel has too much sex, she can fall and become a Dark Angel.
 * Our Centaurs Are Different: Subverted. There are normal centaurs, but then there are also the Dream-Invading Nightmares, and the Virgin-Until-Marriage Unicorns. They're all incredibly lustful of course, though the vanilla-flavor ones at least try to restrain themselves unless they're drunk.
 * Our Dwarves Are All the Same: Inverted. Hard. The MGE Dwarves are Toddler-Sized little girls who're so good with their hands, the simplest touch makes men fall for them.
 * That's just the women. The men are the same good ol' short, bearded, heavy drinking, jolly guys common in most rpgs, though most have gone into hiding after the new Demon Lord took over and began creating a world where all new dwarves that are born will become female.
 * Didn't it say they (Male Dwarves) are already extinct?
 * Our Elves Are Better: And this is what grants the Succubus-infected ones the Heroic Willpower to (temporarily) keep from mating with "inferior" humans.
 * Our Demons Are Different: They all want to bed you (if you're male) or convert you (if you're female). If you're lucky some may ignore you if you leave them be.
 * Our Dragons Are Different: Anthromorphised like every other Monster, extremely intelligent but slaves to their instincts. Said instincts have been warped and their snobbish aloofness is an attempt to hide their forced attraction towards human men. They are now completely incapable of harming humans thanks to the influence of the Demon Lord. Love to collect troves of treasure like any other dragon. Once they find a man who they eventually grow to love, they treat him as the prize piece of their treasure trove. If at some point this man proves himself stronger than her, she'll become an incredibly subserviant "Lizard Woman". Albeit such a dragon will still likely only be obedient and submissive to her husband.
 * Also, they're the only Monster Girl able to turn into their original, true Monster form.
 * Our Mermaids Are Different: Their blood can extend human lifespans.
 * Our Monsters Are Different: Well, they're all female. And horny. All the time, in fact.
 * Not all the time for most of them. Most of the more "humanoid" monsters have heat cycles.
 * Well there's enough monsters that want to rape men to make sure men never leave the house. Unless you have a monster mate already, as it is stated most monsters will not attack a man who has been claimed by another monster (they can tell by sensing her energy and scent on the man).
 * Our Orcs Are Different: They're chubby, pink-skinned women with pig ears on the top of the heads and literal pigtails (as in curly little stringy tails jutting from their rear), as well as being sadomasochists to whom, quite literally, Rape Is Love.
 * Our Vampires Are Different: Not as much as you'd think, strangely enough. The Vampires of the MGE are of the classic, regal, powerful, blood-drinking variety. They do feel pleasure from feeding, as does their prey, but they consider going as far as having sex with a human to be a disgusting act.
 * However, the men they capture to act as servants and food sources will become Incubi if they're fed from enough, at which point the Vampire warms up to the idea of making one her husband.
 * Our Werewolves Are Different: They run around in packs and gang-rape any man they find. Unless you defeat the one trying to screw you, at which point she'll become loyal to you.
 * Parental Incest: Dark Elves hate humans, but still need male humans to reproduce, so when they do get a man they treat them as sex slaves to dominated. They then teach their methods to their daughters who practice with their mother's slave... who is usually their father. The Devil Bugs, being Roachgirls, will also indiscriminately have sex with any male, including their fathers (and since they are such homebodies, this is usually what happens).
 * Pettanko: The Harpy family are all very flat-chested, presumably because they're bird-girls and so need to be aerodynamic. The Cockatrice is flightless, but is a swift runner, so the same principal applies. The Werebat, Honeybee and Beelzebub, three non-Harpy fliers, are also Pettankos, and the Kappa sits somewhere between here and Lolicon.
 * Goblin definitly counts.
 * Petting Zoo People: As noted elsewhere, a fair number of the monsters are this.
 * Pity the Kidnapper: Whoever looks into the pot that a Pot Devil's hiding in will get sucked inside and affected by charm magic. Since the timid Pot Devil has no control over this ability, sometimes she will get raped by the man she pulled in.
 * Plant Person: Alraune, Dryad, Matango and Mandragora
 * Playing With Fire: The Dragon can breath fire, while the Ignis is a Fire Elemental. Salamander possesses flames on her tail produced by magical energy that can be used as a weapon if she wants or can simply be harmless indicators of her arousal (both sexual and fighting spirit varieties).
 * Pop Quiz: The Sphinx casts a curse on a man that comes across her, then asks him a question. If he answers her question wrong, the curse activates, making the man so horny he'll offer himself up to the sphinx. On the other hand if he answers correctly, the curse will be reflected back on the Sphinx... making her immediately rape him.
 * Proud Warrior Race Gal: A few, most of them Amazon Brigades, including normal Centaurs, Lizardmen, and, naturally, Amazons.
 * Rape Is Love: Several monsters, through creative use of pheromones and/or magic.
 * Orcs in Dere mode. In fact, they have an outright rape fetish, and are fine being the rapist (in Tsun mode) or rapee (in Dere mode).
 * Rape Is Ok When It Is Female On Male: If you can't embrace this trope, the whole encyclopedia will be High Octane Nightmare Fuel.
 * Well aside from the few types that usually or never force themselves on men (holstaurus, unicorn, inari and such).
 * Red Oni Blue Oni: One of the entries is a Red Oni, who is described as a super-strong party girl who likes to kick back, drink booze and have sex all day. So far, a Blue Oni hasn't appeared.
 * The Ogre might be intended to be the Blue Oni, being a calm girl that likes to fight.
 * The Red Sonja: The entire Lizard(wo)man race
 * Religion of Evil: The Religion of the Fallen God, supported by Dark Angels and Dark Priests.
 * Not evil persay, but unlike most other Monster Girls that have a bit of restraint, the Fallen Lord's worshipers practice sex 100% of the time.
 * At least in Pandemonium, the Fallen Lord's realm where Dark Angels and Priests bring their husbands. Time is frozen there, and there is nothing to do but have sex.
 * Refuge in Audacity: Although the mere premise of the Encyclopedia may be this, being raped by a sentient mushroom certainly is.
 * Scary Scorpions: The Girtablilu
 * Sex Slave: Surprisingly not very prevalent. There are however the Orcs and the Dark Elves. Orcs will challenge a man they like to One-On-One combat. Whoever loses becomes the slave in the relationship. Dark Elves treat their husbands as slaves because of their natural pride.
 * Shy Blue Haired Girl: Nightmares are extremely shy, and have purple hair.
 * Sinister Scythe: Both the Baphomet and the Nightmare are seen with rather elaborate scythes.
 * The Mantis has a Scythe-Like blade attached to each of her wrists.
 * Snake People: The "lamia family" of species.
 * Snakes Are Sexy: The premise of the Lamia, Echidna, and Medusa races.
 * Snow Means Love: Played Straight. There's a Yuki-Onna Monster Girl, but luckily she prefers to take in and mate with men she leads astray in snowstorms.
 * Stalker With a Crush: The Lizardman entry says if someone defeats her she'll offer herself to be his wife and if the person refuses she'll most likely stalk him until he changes his mind. Given her appearance it isn't a really terrible thing...
 * Likewise the Dullahan which will out and out hunt the man she likes down to bringing him back to the netherworld; and she always finds her quarry.
 * Young Kappas will play with male children around their age, not because they enjoy human company, but because they're picking a husband for the future.
 * The lizardman's cousin race, the salamander, does this in a more blatant way. She'll stalk the man she likes but is not quiet about it, taking every opportunity to shout to the world about how much she loves him and wants to be with him. Their personality is to tend to act without thinking things through first.
 * Super Drowning Skills: An interesting subversion with the Nereid. They'll drag women down under the waves and drown them...only for the victim to be reborn as a new nereid.
 * Super Not Drowning Skills: All the undersea monsters. Sea Bishop especially for being able to give husbands of such species the ability to breath underwater.
 * Super Strength: Red Oni, Goblins, Vampires and Minotaurus are all explicitly much stronger than any human.
 * Taken for Granite: Medusas use this technique to kidnap desirable men. The Cockatrice also has this power. Luckily, the effects are reversible. Also, Gargoyles turn to stone when the sun rises -- and if they're on top of a man when it happens, he also turns to stone.
 * Tsundere: Dullahans. Tsun with their head on, Dere with it off.
 * Orcs are Tsun or Dere depending on which one of you is dominant.
 * Vampires are Tsun, at least until their lover becomes an incubus, whereupon they, sometimes, become Dere.
 * Dragons may also count, as all of their pride and self-dominance goes down the drain when they encounter a "stronger" male.
 * At least around their husband.
 * Background story also mention that the Demon Lord is this, fact that they're now parents to numerous daugthers doesn't stop her from being Tsun-ish.
 * The Fair Folk: Sort of. Fairies & Leanan Sidhe aren't malicious unless a Succubus is involved. Played straight with the Pixies, however, who are actually typed as "Demons" rather than "Fairies".
 * The Undead: The Zombie, Ghoul, Skeleton, Ghost, Doppelganger, Vampire and Mummy entries.
 * Thou Shalt Not Kill: A prime, inviolable mandate enforced on any and all monster races via the Demon Lordâ€™s power. Since the entire idea behind the monster girls is to achieve peaceful coexistence, no monster can willfully take a humanâ€™s life. Ironically, it's the humans that have no such restrictions.
 * Recently translated material has outright stated that monsters will still kill in self-defense and in order to protect their husbands (and presumably their children or friends).
 * Unicorn: They're Centaurs, virgins and only seek virginal husbands too.
 * Virgin Power: The Unicorn toys with this. Her magical powers get weaker if she has sex, but only if her lover has had sex with monster-girls other than her.
 * There's also the even weirder/kinkier example of the Alice monster; her Virgin Power drives men to rape her. And when they're done she gets Easy Amnesia and becomes a virgin again. What.
 * The Virus: Many monsters, most notably the Succubus, and always targeting females. Others include the Werewolf, Matango, Roper, and Dark Slime. Possibly the Honey Bee as well, though it's not revealed what happens to the women they kidnap.
 * The Matango has a rare ability to change men; if enough of her spores get inhaled, he turns into a "mushroom person".
 * And with the introduction of the Lilim, a woman can now be transformed into almost any monster (yes, including a giant slug). Men can also become Incubi when coupled with a monster for long enough, and though they technically aren't monsters themselves, they behave the same and can act as The Virus to human women on behalf of whatever monster species changed them.
 * The Corruption: Basically, demonic energy makes everything either monster girls, some kind of succubus, or physical embodiments of lust (elementals). Also makes everyone horny beyond measure.
 * Voluntary Shapeshifting: Many monsters can disguise themselves as human women. Dragons are standout, being the only monster girl that can transform into their original monstrous form.
 * Well Intentioned Extremist: The current Demon Lord, a succubus, had decided to try to fix the ages-long mutually genocidal war between mankind and the monster races. Unfortunately, her method of doing so has caused the world to sink into its current state, and may lead to everyone's mass extinction.
 * Differently so, the current chief celestial power recognizes that he hasn't left the world in the best state. But his method of dealing with the problem seems to involve forbidding humanity to make contact with monster kind, and resorting to genocide when necessary.
 * It is a little more complicated. Before the new Demon Lord the monsters were the werewolves, vampires and demons found in normal fantasy settings; with only mermaids, elves and fairies being the non-human intelligent races. All of that was part of the world created by the gods (although it's not clear whether the Chief God, who hates monsters, had a hand in their creation in particular). But then the Succubus became the Demon Lord and started to change the nature and the rules of the setting, transforming all monsters into monstergirls and them needing to mate with human males. The chief god doesn't like that and forbids human-monster relationships, and send angels to help the Church into Crusades into the Demon Realm. The Demon Lord has had her share of fights with her husband (a former hero who came to kill her predecessor) about her plans, but it seems that if she was able to gain more power she would be able to remove the whole rape aspect and allow human-monster relationships to have human male children as well as more monster girls. The human women don't enter in her plans, though, so their only option is to transform into succubi or other monster girls with that skill. Ultimately, it's a case of xenophobia versus Getting Smilies Painted On Your Soul, with the current world being the result of the struggle between the two.
 * When Trees Attack: Dryads and Alraune are like this... just replace 'Attack' with 'Rape'.
 * White Haired Pretty Girl: Lilim, Dark Angel, Dark Priest, Dark Elf, Ogre, Yuki-Onna, Unicorn, Ghost, Zombie, Skeleton, Holstaurus, Arachne, Cockatrice all have very light hair, varying from white to various color-shades of silver.
 * Wutai: The Zipangu region, which is the home of all monsters based on Japanese mythology, as well as humans who fashion themselves after Jidai Geki. The monsters are even referred to as "Youkai" there (whereas the usual untranslated term for monsters is "mamono", the reason for this being that "mamono" usually refers to western monsters, rather than eastern monsters.), and they range from being tolerated, to welcomed, to even revered by the humans who live there - and vice versa. They seem to be the third option of the Grey and Gray Morality of the setting, but sadly don't seem too interested in the struggle between the Order and the Demon Lord. Rather they have built up their own forces to keep the other powers from interfering in their part of the world.
 * You Gotta Have Blue Hair: Mermaid, Succubus, Sea Slime, Beelzebub, Pixie, Pot Devil, Medusa, Sea Bishop and Nereid.