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Anime & Manga
- In Osamu Tezuka's Phoenix: A Tale Of The Future, the Moopies are amorphous aliens who will voluntarily become anything a person desires. Earth society condemns interacting with them, because it is of course tremendously addictive. The main character is in love with a Moopie who has turned into his idea of the perfect woman.
- In Revolutionary Girl Utena, it's heavily implied in the Black Rose Arc that "Mamiya" is really Anthy in disguise, and in fact Mamiya at first glance appears to be a Distaff Counterpart to Anthy in terms of appearance.
- Ixtli in RahXephon will take the form of the whomever the RahXephon's pilots cares about the most.
- Meggan, from the spinoff Excalibur. She is the Trope Namer as she was explicitly described as a Empathic Shapeshifter and, indeed, she would look like what other people thought she should. This caused her quite a lot of angst as a kid, though she fortunately had other powers to back it up (and by other powers we mean that she won the Superpower Lottery, big time) and had the ability to adapt to any environment bundled in. However, she managed to move past it as of the Captain Britain and MI13 series.
- Darwin from the X-Men would gain new powers to protect himself from threats, often shape shifting in the process.
- Lifeguard, also of the X-Men, teleported situationally, developing powers that would be useful to save any endangered lives around her.
- Earth X suggested that all of Marvel Comics' supers were evolving toward this state. Loss of Identity soon follows.
- Trauma of Marvel's The Initiative can touch the mind of his target and turn into their greatest fear — complete with that fear object's abilities.
- One of the stories in Demo has a girl with this kind of power, but it only applies to romantic intent. She's searching for someone who will see her the way she really is. She finds a woman who seems to be able to do just that and falls in love with her based on that fact alone, only to find out that the woman is already seeing someone (and hence implicitly didn't care about making her look like the kind of person she already had).
- One of the later arcs of W.I.T.C.H. had Cornelia befriend a girl named Leah, who had the magical ability to change her appearance depending on the current needs of those around her. However, she didn't have full control of her power, and had changed her appearance so many times that she no longer remembered what her face originally looked like. The girls were eventually able to bring her to Yan Lin, who was able to help Leah return to her true appearance.
Films — Live-Action
- Prot in K-PAX claims that he appears human on Earth because it is the most energy-efficient shape he could assume here. He uses the analogy of "Why is a soap bubble round?" and says that on K-PAX he appears K-Paxian.
- In Panna A Netvor (the Czech film adaptation of Beauty and the Beast) , the beast, instead of changing completely from monster to human in a single pivotal scene like in almost every other adaptation, changes according to the beauty's perception of him: when she grabs for his talons, expecting them to be a pair of hands (as he's forbidden her from looking at him and she believes he's human), they magically transform into human hands, but it isn't until she declares that he's beautiful in her eyes that his human form is fully restored.
- Mix a little of this with a whole lot of terror and you've got the insane children's book A Bad Case of Stripes. The story is an aesop to Be Yourself.
- Harry Potter: Boggarts take on the form of a character's greatest fears.
- The Animorphs series makes it quite clear that the instincts of the animal always pop up. Not so bad if you're morphing a dolphin. You basically experience pure joy. Not so good if you're morph a prehistoric superpredator. Then you turn on your friends and attack random prey animals. Nightmare Fuel if it's some mindless automaton insect. All you can do is get in line and serve the queen.
- In Clive Barker's Imajica, one character is a "mystif" who takes on the form matching the unconscious sexual desires of whoever looks at him/her/it. The character says that many people, when shown what they actually desire instead of what they think they desire, end up feeling horrified instead of attracted.
- The Warlock in Spite of Himself series has Witch-moss, an alien fungus that adapts its shape in response to Telepathy— even unconscious telepathy, explaining why there are elves and many other mythical monsters on the planet Gramarye.
- In James Blish's The Duplicated Man, the title duplicates are formed by a machine that is controlled telepathically by its operators. The operators are displeased to discover that all the duplicates come out wrong because each of the operators has his own imperfect, thoroughly subjective ideas of what the original guy is like, both in his personality and his appearance.
- Wild Cards: Succubus becomes the ideal lover of whoever she's near, and has since childhood. Her parents actually took advantage of this and pimped her out as a prostitute (her clients were mostly unaware of her real age since she looked older even in her default form).
- Skinfred, a bizarre one-off character from Fraggle Rock, was completely at the mercy of other people's opinions of him. It's really amazing how upbeat he was come to think of it.
- Red Dwarf
- A one-off character on looked like whoever the viewer was most attracted to — The very personification of beauty is in the eye of the beholder.
- The Psirens from a later series could take the form of their chosen victim's greatest sexual fantasy, complete with voice and mannerisms, etc, only they did it to get brains to snack on.
- The Monster of the Week in the The X-Files episode "X-Cops" kills people using the form of whatever they're mortally afraid of. Forms it's assumed have included a werewolf, "the Waspman", Freddy Krueger, a crackhead, and the hanta virus.
- A one shot patient in House had a bizarre type of amnesia, where he would automatically adopt the mannerisms and personality of whoever the dominant person in the room was. At one point, House and Cuddy decide to use his condition to deliberately determine who is really top dog by seeing who he will mimic in a room with just the two of them:
Patient (to Cuddy): Your ass is amazing...House: That's definitely me.Cuddy: Doesn't prove anything... I'm very proud of my butt!
- An episode of Star Trek: The Next Generation featured a woman who was to be used to seal a peace treaty: she would marry the leader of a planet and end a centuries long war (which began when one royal brother kidnapped the other's bride). The problem is, while she remains physically the same, her personality changes to whatever the men around her find irresistibly attractive, which has the added effect of her being irresistibly attracted to every man she meets. At least until she reaches "maturity" and forms a bond with a single mate, then Shapeshifter Mode Lock kicks in and she remains that person's ideal personality permanently. So the problem is twofold, managing a way to safely transport her to her destination without her causing a riot among the various males who all fall in love the moment they meet her or her bonding with a single individual before she meets her arranged husband. They manage the former by keeping her as isolated as possible once they realize how disruptive her mere presence can be, the latter issue ends up as yet another example of Picard's tragic love life. She bonds with him, but of course Picard's ideal mate is noble enough to put her duty to end the war ahead of her own happiness, so she resolves to fake bonding to her new husband (using her residual empathic ability to understand his desires) for the rest of her life.
- The Tulpas in Over the Edge are formed by what their opposite expects them to be.
- City of Heroes': This, combined with Power Perversion Potential, can be found in...certain RP cliques on one of servers.
- Eevee: every game describes it as having an unstable genetic structure, and it evolves into one of several creatures depending on environmental stimulus (or exposing it to a magical stone). So far, we have evolutions for eight habitats: hot/fire, aquatic, electrical, nocturnal, diurnal/friendship(?), forest, cold/snowy, and bonding with another being. That said, once it evolves it's permanent, and since there are reliable ways for Trainers to force/invoke each individual evolution...yeah.
- Ditto, however, can transform into anything it sees regardless of size. In the games, it can only transform into other Pokémon, but in the anime it has been shown to mimic things like objects.
- The Dog in Secret of Evermore takes a form to reflect whatever region of Evermore the Boy is exploring at the time.
- Whateley Universe:
- Fling shapeshifts according to other people's sexual fantasies, of any sex or sexuality.
- Another secondary character shapeshifts into whomever she's looking at.
- The SCP Foundation has several of these:
- SCP-056 is a being that becomes "better" than anyone observing it. It will take on a shape that is more attractive, stronger, and smarter, with the particulars determined by the mindset of the observer. Even when there aren't any people around, if there is a camera monitoring it, it becomes a higher quality video camera.
- SCP-523 is an object that transforms into something that will have no current use for the person holding it. For example, if you are cold, it would become an ice cube. If you are trying to put out a fire, it would become something flammable.
- A teddy bear run through SCP-914 on "Very Fine" ended up as a ball of fluff which transforms into an animated plush toy if held by a sentient being. The toy's appearance and behavior is whatever the holder finds most Cuteness Proximity-inducing. It was removed to be analyzed under controlled conditions later.
- Oliver, a minor character in Worm, changes his face and body according to his basic perception of attractiveness which slightly changes every time he sees a new face, to the point that even his friends have had trouble recognizing him.
- Ex-Super Soldier Shane "Goose" Gooseman of Adventures of the Galaxy Rangers shapeshifts automatically in response to any threat (forming reflective armor against Frickin' Laser Beams, for instance), but if his Series Five implant goes out of whack, he loses control of his power and becomes a danger to himself and others.
- The chameleon. They change colors based on features of the environment like temperature. Despite the common notion, their color change is not based on the color of the surrounding environment; a naturally green chameleon will not change to pink or brown if you pick it up or move it to a piece of tree bark. Apart from specific patterns for things like mating, most of the color changes are darkening, brightening or paling.