Morphic Resonance

""The chieftain had been turned into a pumpkin although, in accordance with the rules of universal humour, he still had his hat on.""

- Terry Pratchett, Lords and Ladies

In fiction, when people turn into things, often times, the things will...look like themselves. Characters will often retain specific traits between physical forms. In some cases, this is as easy as hair and eye color, which makes sense to a degree. Things get a little confusing, though, when characters end up keeping a color scheme or markings based on, say, the clothes they were wearing or the color of their eyes.

It's done, of course, so the viewer/audience/reader can tell them apart from other animals or other people wearing the same outfit, if they're infiltrating and pretending to be someone else. It can also extend to the shapeshifter's voice, retaining their identifying vocal range, regional accent, and personal inflections regardless of whether their current body should be able to speak in that manner or not (sort of a non-malicious version of Voices Are Mental).

If these identifying cues become relevant to the plot, it will probably become a Glamour Failure.

Named after a not-so-popular hypothesis by biologist Rupert Sheldrake, in which the forms of organisms are imprinted upon 'morphic fields', which in turn influence the forms of subsequent organisms (at least, before the term was hijacked by science fiction authors to name this trope's concept). See also Shapeshifter Default Form.

Anime & Manga

 * There was an episode of Pokémon with a Ditto owned by Duplica who had this problem -- it could turn into anything, but it always kept its own face, which usually looked downright RIDICULOUS. It is eventually stolen by Team Rocket, who flat out threatened the poor thing, eventually teaching it to make a perfect transformation. Duplica returned in Johto with a second Ditto with yet another transformation issue -- it could transform perfectly...just not its size when it came to big Mons. Duplica eventually decides that she'll make it her goal to try and capture an entire team of Ditto with various transformation quirks.
 * The Ditto in Pokémon Snap also have a problem with their faces not changing. In fact, it's the only way to tell them from normal Bulbasaur (which they will register as) until you hit them with a Pester Ball to make them change back.
 * At least in early generations, any Ditto who used Transform would become a perfect copy of the enemy sprite, but would retain its purple palette.
 * Another Pokémon example: in the Johto-arc episode Hocus Pokémon!, Ash was transformed into a Pikachu for a few minutes. As a Pikachu, he still had the same eyes and hairstyle.
 * When incarnates as Femto in Berserk, one of his primary features is the demonic hood he wears, which is very similar to the helm that he wore as.
 * In Princess Tutu, Ahiru's duck form has a sometimes disturbingly human face and retains her trademark hair-style. Or maybe it would be more accurate to say that her human form retains the trademark feather-style of her duck form.
 * In Ranma ½, most of the transforming characters retain some of their regular characteristics. Some are minor and make sense, like Ranma retaining his hairstyle because there's nothing in the transformation that would require undoing his braid. Others are either an item or a physical feature:
 * Genma's panda form has round black circles around the eyes, looking very much like the glasses he never part with in human form.
 * Ryōga retains his Cute Little Fangs as P-chan, though that's nowhere surprising for a piglet. His trademark bandanna also almost always end up tied around P-chan's neck, and then returns to his head when changing back. Which made the "Charlotte" collar that was put on his pig form unusual, because it stayed on his neck (despite the collar being small and, unlike the bandanna, very tight) when he reverted to human.
 * Shampoo's cat-form markings match the clothes she wears most of the time, and her fur is an unusual shade of pink and purple in the anime. She also always keeps the bell-like, round hair decs tied to her bangs.
 * Mousse keeps his fringe of hair as a duck, as well as his Nerd Glasses. The glasses don't shrink, however -- he owns a second pair sized for his duck form (this can be seen clearly in the manga, book 10 chapter 5).
 * An Imagine Spot where the characters envision Happosai changing into a tiger, a monkey, or a snake, has them all imagining animals that clearly have Happosai's features.
 * Rakkyousai's tiny ponytail and swirly spiral markings on his cheeks remain in place whether he's a child or a tiny old man.
 * A monkey thrown into Nyannichuan, which had a very unique and nearly human look compared to the rest of Takahashi's monkeys, retains her basic facial appearance as a human.
 * Weirdly, Rouge's translucent pants disappear whenever she becomes Asura and come back when she reverts, even though her lower body (and the rest of her wardrobe) doesn't change at all. Her waist-length hair also disappears, though that may simply be due to how hard it would be to draw long hair for one head with three faces.
 * This has also caused no end of controversy as to what the extent of curses' transformation really is. The common consensus is that cursed characters transform into "what they would look like" in the alternate form, and this is proven right by the Musk Dynasty saga (wherein another Gender Bender victim of Nyannichuan looks nothing like female Ranma, but like a female version of himself, and various animals thrown into the spring also have unique appearances and the similarity between two Nyannichuan victims is described as so rare it's actually a plot point), but muddled by the Phoenix saga (where the Phoenix people "somehow" manage to create a spring which does turn you into an exact duplicate of the original.)
 * In Inuyasha, Shippo always keeps his tail, while Naraku, much to his frustration, retains the spider-shaped burn scar that marks him as part-human. The latter is so persistent that ripping the skin from his back or burning it off (which his Healing Factor enables him to do without any long-term consequences) will only result in his skin growing back with the mark intact. The same applies to all of his detachments.
 * Averted in Wolf's Rain. It would have made perfect sense for the wolves' fur color to match the hair of their human forms, but the colors are reversed for Kiba.
 * Having black hair in his human form actually makes a lot of sense -- it makes his skin and eyes stand out a lot, so it's not too much of a stretch that the guy with light eyes and pale skin is really a white wolf.
 * Not to mention that it stops Kiba from being a White-Haired Pretty Boy, which he was dangerously close to becoming.
 * In Fushigi Yuugi, Chichiri does an impeccable impersonation of cold, calculating Nakago...except he brings his own propensity for going Super-Deformed. Hilarity Ensues.
 * Graf Herrmann from Mahou Sensei Negima keeps his horns when he's pretending to be a human. To be more accurate, his horns turn into a strange, curving hairstyle that look like his horns.
 * In The Slayers, Filia's human and dragon forms share a similar hairdo and a pink bow.
 * In a meta example, the manga Gundam Sousei (a Dramatization of the creation of Mobile Suit Gundam) depicts the show's voice actors as looking like their characters. This varies between people: Shuichi Ikeda looks like an older, black-haired Char, while Tohru Furuya looks exactly like Amuro.
 * In Ghost in the Shell: Solid State Society, the characters who turn out to be all have.
 * As witch-apparentices, the main characters of Ojamajo Doremi could turn into pretty much any animal they wanted. However, no matter what form they assumed, their fur would always be of the girl's Signature Color and Doremi would always end up with Odango somehow, even if the animal in question didn't even have hair. Likewise, Hazuki somehow never lost her glasses upon transforming.
 * There are several instances of this in Hell Teacher Nube, especially when it comes to shapeshifters:
 * An accident with a magical artifact temporarily shoves Miss Minako's soul into Miss Ritsuko's body, resulting in a mishmash that calls herself "Miss Rinako". Her appearance is a combination of both women right down to the outfit and hairstyle.
 * Whenever Nube is.
 * Hayame the mermaid, who has several distinguishing features in her true form (such as webbed hands, large gills on her ribcage, and fin-like ears,) keeps her exact same face and hairstyle as a human.
 * Subverted with Tamamo, the yohko. This type of kitsune steals human skulls for his own use, which grants him the exact appearance of whoever the previous owner was (up to and including hairstyle.) This causes some discomfort when.
 * A mystic tree in the school's playground releases insects that have a heavy resemblance to whoever sticks their finger in a knot and gives it some blood. As in, when the girls tried it, they got butterflies and moths that looked exactly like them but with wings. However, these insects quickly degenerated into horrifying "halfway" states. Nube settled the commotion down by producing Nube-faced Hercules beetles complete with gloved Red Right Hands that subdued the monstrous bugs.
 * The spirit of bedridden Ill Girl Ayumi, who attends school via astral projection, still wears her glasses even though a projection wouldn't need them. She clearly does this to preserve her self-image, since she, Tamamo, and Nube (who taught her how to project) can modify their projections at will, to the point they could be blobs of ectoplasm if they wanted.
 * The Oni Siblings are all over the place: Baki's human form is heavily muscled, has wild hair, and prefers intimidating clothes like biker jackets and chains, and he closely resembles his original shape. Zekki's human form is a wispy bishonen that is nothing like the huge and horrific monstrosity of his Oni appearance. Minki looks exactly the same whether human or Oni, just minus the horn and the monstrous right hand from the latter form.
 * Partly averted in Yaiba, where the some of his transformations made with the Gold Orb are complete, but played straight by Shiro Amakusa who retains his whiskers and sometimes his collar while transforming.
 * 007 of Cyborg 009 can turn himself into anyone, but he always retains his decided pronounced belly button, and reverts to his original form if it is pressed.

Comic Books

 * In One Disney's Aladdin Comic, the genie switches Aladdin and Jasmine's bodies to teach them a lesson, and their clothes change colors to reflect their normal colors. (Aladdin as Jasmine's top and pants are purple and white, and Jasmine as Aladdin's vest and pants are blue)
 * Plastic Man could become almost anything, but kept his colors.
 * Whether or not he has to keep his goggles and other facial features depends on the writer and/or medium.
 * His power is actually being semi-fluid and he is therefore able to stretch/contort into the shape of anything. He does not actually turn into the thing.
 * This troper once read a JLA comic where Plastic Man turned into an aeroplane that could actually fly. And, with tremendous effort, he once turned the tip of his nose blue.
 * The Impossible Man character in the Marvel Universe and all the other Popuppians. He can shapechange into different forms but always keeps his green and purple coloration.
 * This is, in fact, how he lost a Shapeshifter Showdown once. After trying to impress each other with a wide variety of assumed shapes for the entire issue, his opponent Warlock (with a little help from his teammates, who felt the whole thing was getting out of hand) hit upon the idea of changing color, which he could do and Impy couldn't.
 * Changeling (a.k.a. Beast Boy) from the Teen Titans is always green in his various animal forms.
 * Snowbird from Alpha Flight is always albino.
 * As is Virginia Dare in Marvel 1602 (which is loosely based on the legend that she could turn into a white deer).
 * In X-Nation 2099, the mutant Willow always has a particular marking around her left eye, even though her shapeshifting powers are otherwise so precise that she can duplicate another person's form right down to their DNA.
 * In Avengers: The Initiative, secret Skrull spy Crusader has a flashback to a combat training exercise on his homeworld where his oppenent K'rtem gave him a scar. Crusader vowed to keep the scar no matter what form he took in tribute to K'rtem's might.
 * Warlock at one time was only able to shapeshift into black things with yellow circuitry. But he got better at shapeshifting and that quality went away.

Film

 * The entire last bit of The Emperors New Groove has Kuzco retain the black of his hair and the red of his old imperial garb across the animal kingdom. Similarly,
 * Happens in Disney's The Sword in the Stone. When Merlin and Arthur transform, Merlin retains the blue of his cloak, his glasses and his bushy moustache, while Arthur has the earth tones of his clothing and his page haircut. Madame Mim changes into animals who are fat, pink and have purple hair, except for that one time during the Wizard's Duel.
 * Happens with all of Genie's transformations in Aladdin. Also, when Abu is turned into an elephant, he retains his hair, fez, and, strangely enough, his long tail.
 * Also, Snake Jafar at the end of the film.
 * In The Princess and the Frog, Naveen and Tiana's eyes stay the same after they're changed into frogs and eyes stay the same after he's changed into
 * The various animals Mama Odie turns her snake Juju into keep the snake's colouration as well as his big yellow eyes and forked tongue.
 * Lumiere & co. from Beauty and the Beast keep their general appearance. The Beast keeps his Blue Eyes and hair color.
 * Ralph, the All-Purpose Animal and Male Lead of Twice Upon a Time, could shape shift at will, but always had the same rather dorky face.
 * In Help! I'm a Fish, when transformed into fishes, Fly keeps his hat and a tuft of hair, Chuck keeps his glasses, and Stella keeps her skirt and pigtails.
 * In the X-Men movies, Mystique's eyes occasionally flash yellow when she's shapeshifted into someone else as an indication it's her.
 * In Megamind, the titular alien, no matter the form he used, had big green eyes.
 * In Terminator 2: Judgment Day, the actors all used a specific mannerism, looking upward at the camera in a sinister fashion, to indicate it was the T-1000 using its mimetic abilities.
 * Dragon Maleficent from Sleeping Beauty.
 * When Kenai is transformed into a bear at the very beginning of Brother Bear, if you look very closely, you can actually tell that his bear form has the exact same facial features as his original human form. Also, his fur is the same color as his clothing.
 * Merlock, the Big Bad of DuckTales the Movie: Treasure of the Lost Lamp, actually retains his mustache and goatee whenever he turns into (in order of appearance) an eagle, a rat, a bear, a cougar, a cockroach, and finally, a gryphon.
 * When Mater disguises himself as a Lemon tow truck in Cars 2, he actually retains his Hazel Eyes (and yes, the opposite is true).
 * And his body style when he decides to have fun with his disguises, such as a German SUV wearing lederhosen, a Dracula-esque hearse, a yellow drag racer, and a taco truck.
 * And Rod "Torque" Redline's Gremlin disguise. Since his disguise is made up of a retractable metal shell instead of a voice-activated hologram projection, the only thing about him that doesn't change are his hubcaps.

Literature

 * In The Last Continent, the Librarian gets a magical illness that makes him turn into all kinds of things, all of which have shaggy red fur. This includes a book, various pieces of furniture, and
 * In the TV adaption of The Colour of Magic, the Librarian's human form has a thick auburn beard. He really does look like he's waiting to turn into an orang-utan.
 * Also, in Discworld in general, nothing, not even a god can change the nature of his or her (or its) eyes.
 * And Angua, a werewolf with long blond hair, turns into a wolf with long blond fur.
 * The Animagi in Harry Potter, particularly McGonagall and Rita Skeeter. Their animal forms both have their "glasses", in that the characters "wear" glasses-like patterns on their animal faces. This is at first hinted to be deliberate, as Animagi have to register and have distinguishing marks, but then Rita's an unregistered Animagus and she has such markings, so it's apparently intrinsic to the process.
 * In Lirael from the Old Kingdom series, when Lireal is exploring the Great Library, she uses various shapeshifting spells to turn into animals. For one of her later explorations, she's using an otter-form and notices that the fur seems darker than normal. As otters are colourblind, its not until her friend, the Disreputable Dog (exactly what it says on the tin), tells her that "otters shouldn't have red bellies" that Lirael realises that she has subconsciously changed the fur to match her promotion within the Libraray to a red waistcoat.
 * In Holly Black's Modern Faerie Tales, faeries keep a trait when they transform. The troll Ravus, for example, turns into a human with golden eyes.
 * Sun Wukong, the Stone Monkey, can use Taoist arts to perfectly change into many different animals -- but if he tries to become a human, he can only change his head and must conceal everything else.
 * In the German novel Krabat the Master, the Evil Sorcerer can turn into different Animals, but they will always have only a left (I think) eye. The same counts for his students, whose Animal forms always mirror their appearances as humans.

Live Action TV

 * In BeastMaster, King Zadd is turned into a donkey with the same tatoos. Although one character finds them familiar, it doesn't become Glamour Failure in time to be meaningful.
 * Since Kamen Rider Decade, who has the power to transform into his predecessors, needs to access the DecaDriver to use his own abilities, the Driver appears on all his forms.

Multiple Media

 * Word of God says that Kanohi Masks generally retain their basic shape if their wearers willingly shapeshift, but there's not much in the merchandise and media to suggest this.

Myths & Religion

 * According to tradition, Satan can transform into any creature, every part of him -- other than his feet (either cloven hooves or chicken feet). Fridge Brilliance: this must be why he prefers snakes. Nothing would give him away in that form.
 * Older Than Print: Odin could also turn into various animals (his favourites were Ravens and Wolves), but like him, they would always have only one eye.
 * The alp, a nightmare-inducing, blood(and breast milk)-sucking creature from German folklore, derives its shapeshifting abilities from its magic hat, which it always wears, and which is always visible in some form no matter what it shapeshifts into.
 * In Japanese folklore, kitsune (fox spirits) can shapeshift but will retain their tails (like the examples from Inuyasha and Dungeons & Dragons). Therefore, they must cover up their tails in a more conventional manner to hide their true nature.

Puppet Shows

 * On the Roger Miller episode of The Muppet Show, an outbreak of cluckitis, a disease which nearly-instantaneously turns the afflicted into chickens after they sneeze, sweeps the cast. The Swedish Chef retains his mustache and eye-covering eyebrows. Lew Zealand, Rowlf, Miss Piggy, and Janice keep their respective eyes; Kermit does, as well, and even has his pointy collar. Only the main cast retains Morphic Resonance, however, and some don't even get that: extras and even some of the main cast turn into indistinguishable chickens. Maybe they'll have a hat or necklace, which they keep.

Tabletop Games

 * Dungeons & Dragons
 * The hengeyokai race in the 1st Edition supplement Oriental Adventures. When they shapechange into human form, they always have a distinctive feature from their animal form, such as a sparrow hengeyokai with a long nose like a bird's beak.
 * Dungeon Magazine #21, adventure "The Chest of the Aloeids". The goddess Athena is noted as always having grey eyes, no matter what form she assumes.
 * Lunars in Exalted each have a unique body feature called a Tell, which is retained regardless of what they transform into. Their magic makes their Tell difficult for normal people to notice, but once you do, you'll always be able to identify that Lunar at a glance, regardless of form.
 * One of the sample archetypes in Mutants and Masterminds is an Indian woman with a blue costume and a bindi dot on her forehead. She transforms into blue animals with little red dots on their foreheads.
 * When Chaos Lords and Sorcerers of Warhammer 40000 transform into Daemon Princes, there's a good chance that they'll still be clad in the remnants of their old power armor. That being said, not much else is recognizable...

Video Games

 * Pretty much any video game where you turn into something beyond just a standard power up.
 * The vehicles in Yoshi's Island
 * The masks in The Legend of Zelda: Majora's Mask. Link always has his green hat, though it becomes the size of his entire body in deku form for some reason.
 * Whenever Kirby copies a power, he gains a hat characteristic of that power. This is carried over to Super Smash Bros.
 * In Banjo-Kazooie, Banjo always has his yellow shorts and blue backpack.
 * Often averted in Final Fantasy games, but played straight in the remake of Final Fantasy IV -- characters turned into frogs or pigs will bear a resemblance to their original selves. In the original, you just turn into a generic looking pig/frog/tiny person.
 * Luke in Project Altered Beast keeps his Cross shaped scar in all his forms except the.
 * Boo Mario/Luigi.
 * And the Lumas' bunny forms.
 * When Maya or Pearl channels someone in the Phoenix Wright: Ace Attorney games, they change their size and faces to the channeled, but they retain their hair style, color, and their clothes.
 * This is arguably because hair and clothes are "dead" and can't be affected by living tissue. Their full bodies change completely into the channeled person.
 * A strange, non-supernatural example: when  testifies in court in the second game, the transceiver he's using to communicate with the court has a button resembling his monocle.
 * During the Shannon boss fight in God Hand, Shannon can turn Gene into a chihuahua with one attack. His fur keeps the skull pattern from his jacket.
 * The status effect Ovum from Breath of Fire 3 turns the affected into an egg. Your party members keep their primary color scheme as eggs (and, in weretiger Rei's case, his tail).
 * Druids in World of Warcraft. Elves keep their long eyebrows and Pointy Ears (even if this makes their bird forms rather silly-looking), and Tauren keep their horns. In Cataclysm, with the addition of Troll and Worgen druids, Trolls keep their tusks and mohawks, while Worgen's forms have glowing eyes and manes.
 * Also, Alexstrasza still has her horns, glowing eyes, and necklace in humanoid form as in her dragon form, along with a wing-like cape. Her sister Ysera gets similar treatment. Black dragons also always have humanoid form as humans or elves with black hair.
 * Shows up in the Kingdom Hearts series from time to time.
 * In the first game, Donald Duck and Goofy change into sea creatures in the Atlantica level (an octopus and a sea turtle, respectively), though they still have their distinctive faces.
 * In Kingdom Hearts II, in addition to the Atlantica level, there's also the Pride Lands level. Donald is a bird, and Goofy is a turtle again, both with their own faces. Sora is also transformed for the Pride Lands level; he's a lion cub, with his blue eyes, crown pendant, and distinctive Anime Hair.
 * Furthermore, abuse of his Super Mode can randomly transform Sora into a Heartless version of himself, completely black and with glowing eyes. Which is funny because.
 * In King's Quest VI, the genie appears throughout the game, spying on or trying to trick Alexander. His glinting Eyes of Gold are always a dead giveaway.
 * In Scaler, after being turned into a lizard, Scaler retains the blue-and-yellow colour scheme of his clothes, and also a sort of scaley, spikey version of his blonde hair. Likewise, when transformed into other types of lizard-y creatures, Scaler still keeps a blue-and-yellow colour scheme.
 * In Shin Megami Tensei, you can always anticipate who "Louis Cypher" will be because he (or she, as the case may be) will always have intensely golden hair and blue eyes, regardless of the setting of the game. And in all but one case, he will also have long hair. Especially notable in Shin Megami Tensei III: Nocturne, where he assumes two different forms to mess with you.
 * In Shin Megami Tensei: Strange Journey, after fuses with, . This is a very unique transformation because fused demons always result in a completely different kind of demon.
 * In Persona 3, the Ultimate Persona of the Death Arcana, Thanatos, wears a mask that is like a highly stylized version of the Death Shadow's head. Additionally, Orpheus, the main character's initial Persona, has his or her same face, and when Thanatos and Orpheus combine, the resulting shares traits from both.
 * In Persona 4, most of the Personas earned by the protagonists look like the Shadows they originally were, with minor differences to make them less nightmarish and more heroic. Amusingly, although Take-Mikazuchi looks little like Shadow Kanji, he DOES have the skull-and-bones-on-black motif that Kanji's clothes have.
 * In Shin Megami Tensei Nocturne, Noah, the demonic sponsor for Isamu's Reason, eventually.

Webcomics

 * In El Goonish Shive, the artist Dan Shive often draws characters transformed into animals or anthropomorphic shapes (sometimes pertaining to the storyline and sometimes not), but they always retain their original hairstyles. Often, the fur will be the same color as their hair.
 * I seem to recall that a Filler Strip of El Goonish Shive actually explained some of that -- namely, that since most of the transformations were inflicted by Tedd's TF Gun, people ended up looking the way they did because that's the way he LIKES it. This is visible in the case of Hedge and Guineas, who've got transformation-powers of their own and transform much more completely as a result. Guineas is basically unrecognizeable between his two forms...
 * As for Grace, well, her use of this trope is apparently down to the strange synergy of her mixed Uryuom and Lespuko genes, which enable her to instinctively blend the most desirable features of all her available forms -- such as maintaining the expressiveness and speech-ability of a human face while in an animal-form.
 * Grace gained most of her forms from using the TF Gun, which seems to have changed aspects of her transformation from how it originally worked. (Grace is a natural shapeshifter with three forms -- Human, Half-Squirrel, and Squirrel. However, whenever she's transformed with the TF Gun, she becomes able to transform into (and out of) that form on her own.)
 * In Gunnerkrigg Court, when, the feathers on their heads mimic the hairstyles they had as humans.
 * Evilish, now on extended hiatus, features a character that can change into almost anything, but will always keep triangular facial markings under his eyes.
 * In The Inexplicable Adventures of Bob, Princess Voluptua's alien butterfly form retains her long red hair and has roughly the same silhouette as her human mask (except for the wings, of course).
 * Last Res0rt has this enforced on Alice, sort of; she can't change the color of her eyes. This would be more of an issue if her eyes hadn't already changed into the same red-pupils-in-black "Dead Eyes" that every Djinn seems to have, but among the limited cast, it's trouble enough.
 * An unusual variation in The Wotch: there's a Running Gag that every time Jason is turned into a girl, he gets red hair (unless the spellcaster specifically wishes otherwise), even though his normal form has blond hair. For him, even transformations unrelated to gender-swapping tend to produce forms based on that redheaded female form rather than his normal form.
 * Also seen in Order of the Stick, where shapeshifters keep their overall color scheme, like with Leeky Windstaff or Vaarsuvius, whether (s)he shapechanges voluntarily or is victim of a baleful polymorph. As for Sabine the succubus, if she can take various human forms, she tends to retain her black hair and dusky skin tone (as well as showing red eyes from time to time).
 * The Aces (animals turned human) in Pandect have morphic resonance with their animal forms and frequently increase the effect with their clothing and hairstyle.
 * Danny, the titular character in Shifter, has eyes and a mouth that appear on whatever form he takes, identical to the eyes and mouth on his human face.
 * The students in Wizard School keep their glasses when shapeshifting to play Transmogritus.

Web Original

 * Fauna of DC Nation maintains her blonde hair, bipedal form, and cannot change her height.
 * The cast of Suburban Knights maintain their identifying articles despite being in costume for the majority of the movie, i.e. The Nostalgia Critic and 8-Bit Mickey wear their neckties, Paw Dugan wears his headphones, Todd in the Shadows keeps his mask on,, etc.

Western Animation

 * In The Grim Adventures of Billy and Mandy, whenever Nergal Junior transforms into a different shape, he always keeps his signature lime green eyes, jagged yellow teeth, and nerdy glasses.
 * Teen Titans: Beast Boy can transform into any animal, but they were always green.
 * And when Mumbo transforms him, he can transform into any inanimate object but, again, he's always green.
 * His Evil Counterpart can do the same, but he's always blue.
 * In Aqua Teen Hunger Force, a running joke is that Meatwad can change shape, but only into either an igloo, or a hot dog. Both of these still have the same texture and color as Meatwad, and still have his face.
 * In earlier episodes, he could change into other things, such as a Meat Bridge and a statue of Abe Lincoln with a Samurai sword (it was supposed to be a statue of Wayne Gretzky). He became a hammer in a much later episode, too.
 * In The Movie, he turns into He retains the previous clues to his identity, the texture and face and whatnot.
 * Justified since Meatwad isn't a true shapeshifter. He's just a ground meat patty than can change his shape.
 * In Ben 10, each of Ben's alien forms has a "timer" resembling the face of the Omnitrix, in addition to, for most of them, an outfit design similar to that on Ben's one T-shirt. At least one of them has the design (a black stripe on a background of white) on its skin.
 * In "Gwen 10", the colours become light and medium blue, reflecting her one T-shirt.
 * In Gargoyles, no matter what form the Weird Sisters take, they always have their respective hair colors.
 * When Transformers reconfigure themselves to have different vehicle forms, their robot-mode bodies tend to look roughly similar to their previous forms. For example, Generation 2 gave Optimus Prime a new "Hero" body that still had his distinctive red truck cab chest, even though his chest actually became the underside of his new vehicle mode (which had a white cab of a completely different design).
 * Mind you, that's a major improvement over the original series, which applied the same concept going backwards in time. G1 Bumblebee had VW Beetle hood halves on his feet long before he turned into one (indeed, long before there was any such thing as a Beetle, or Volkswagen, or Germany, or humans at all).
 * This is something in several series (but not in just as many others). Rather than make two designs for every character - a pre-Earth one that will only be in part of the premiere and an Earthen one - the standard robot modes will be used in Cybertron scenes. Transformers Animated seems to be the only series so far that gives everyone pre-Earth and Earth forms in vehicle and robot mode (they've all got toys, natch.)
 * And who can forget the episode "Only Human"; when Rodimus, Ultra Magnus, Springer, and Arcee are forced into human bodies, not only does Arcee's hair resemble her robot form's helmet, but they almost immediately find a building with jumpsuits in their robot forms' color schemes for them to wear.
 * Adventures of the Galaxy Rangers: Shane Gooseman always keeps a bipedal form and roughly the same mass. He usually also keeps the blond hair.
 * This happens in one of the later episodes of The Magic School Bus, where the kids learn about animals living in the city, and their hairstyles are kept when they're changed into animals. The same could be said for any of their other transformations, including those The Bus undergoes.
 * In Wakfu, the ancient dragon, Grougaloragran, retains his bushy eyebrows and beard, as well as a general dark color, whether he transforms into a human or a giant squid kralamoure. This is also true for Adamaï, a younger dragon, who can take many shapes but keeps his white-and-blue color scheme and peculiar eyes.
 * Here's a tip for new viewers of Samurai Jack. If Jack encounters a character or creature with red, green, and black predominantly featured in its color scheme, it's going to be Aku in disguise. Yes, this even applies when
 * On Spider-Man and His Amazing Friends, the Chameleon's eyes would flash to indicate it was him wearing whatever shape he was in.
 * Although he's not a shapeshifter, Danny Phantom's green eyes show in the face of whoever he's overshadowing. And that's true for other ghosts as well.
 * Strangely enough, on Superfriends, the Wonder Twins had differing shapeshifter tells: it was Zan whose face was usually visible as a reflection on the surface of whatever water-based item he turned into. Jayna maintained her purple eyes no matter the form she took.
 * All fairies from Fairly Oddparents maintain their primary characteristic when they change into something else. Their crowns frequently remain above their heads no matter their shape as well. This is also true for other nonhumans.
 * Cosmo's and Wanda's hair colors are their primary trait, so they turn into green and pink items.
 * Jorgen Von Strangle has a Lantern Jaw of Justice, so whatever he turns into tends to have one as well.
 * Wandissimo Magnifico turns purple, like his eyes. His godchild's parents even called him purple when in his ferret form.
 * Alien Mark Chang keeps his big square teeth and his red eyes in his human disguise or while otherwise using his image fake-ifier.
 * Wanda and Cosmo's unlikely colored forms are often Lampshadeed by anyone with enough attention to notice that dogs shouldn't have pink or green fur. This went to Serial Escalation levels when they agreed to switch roles with Timmy and transforming themselves into looking like him - except their hair, voice, and eye color remained the same as their default forms. This became a source of confusion to Timmy's dim parents whenever they encountered one of them breaking house rules.
 * A Couch Gag from The Simpsons parodying human evolution actually showed various prehistoric animals resembling Homer Simpson gradually turning into, well, guess...
 * There is also an octopus resembling Mr. Burns, a dragonfly resembling Lenny Leonards, a Pterodactyl resembling Agnes Skinner, a Tyrannosaurus Rex resembling Bart, and a Stegosaurus resembling Lisa.
 * And a small mammal resembling Moe Szyslak. (Which did evolve from Cave-Moe.)
 * A Treehouse of Horror episode was actually about Dr. Hibbert being a mad scientist who turned everyone else into an animal who retained characteristics of who they originally were: for example, we have Homer as a walrus, Marge as a jaguar, Bart as a spider, Lisa as an owl, and Maggie as an anteater.
 * Star Wars: The Clone Wars: The Son and Daughter's gargoyle and gryphon forms, respectively.
 * The mascaritas' Signature Moves from Mucha Lucha. For example, Ricochet's "Pulverizing Pinball" has him turn into a large sphere colored to resemble his wrestling mask, and Buena Girl's "Bulldozer of Truth" has her turn into a bulldozer with her outfit colors.
 * Yam Roll of the so-named cartoon can transform into pretty much anything, but that anything will be coloured like his yam filling and wearing his trademark cowboy hat. His mentor has similar powers, always turning into something brown with a white beard.
 * Tom Terrific, the 1950s tv cartoon character, could transform himself into anything - but always kept his face and trademark funnel hat.
 * American Dragon Jake Long has spiked green hair and always wears a red jacket; he turns into a red dragon with green spines down his back. His Grandpa wears a blue robe and has white hair and a moustache; he turns into a blue dragon with white spines and a moustache. And his kid sister Haley wears pink and has bunches; she turns into a pink dragon with bunches.