A person is either part of a certain category (such as a certain species or gender) that they do not feel all right with, and so they want to be part of a different category, or the person was assigned a certain category (often against their will) that they never belonged to in the first place, or some combination of both. Because of this, the person may want or need to change their body or nature or both.

In fiction, TransNature can take ''any'' form, especially in Fantasy and Science Fiction. Note that trying to regain your true form (after having been cursed, for example) does not count. Starting to identify with your new form does, however.

When a character is a fictional kind of TransNature, it is often a big part of this character being a hero or villain: Either he's a member of a oppressive/evil group transitioning to become one of the good and/or oppressed people, or we have a "[[CategoryTraitor traitor]]" who identifies with the "wrong" group.

It can also work as an inversion of InternalizedCategorism: Bob thinks men/humans are bad, but instead of denying himself the good things about being a man/human or doing bad things because he thinks that this is what being a "real" man/human means, he instead ''stops'' being a man/human -- magically changing into something else.

Expect the character to be in a world of trouble if there is NoTranshumanismAllowed.

May be caused by HumanityIsInfectious, or inversions thereof. In some cases, TransNature leads to HumanityEnsues. Note however that that trope is usually ''not'' combined with TransNature - instead, the animal resents having been transformed to a human. One very common form of TransNature is PinocchioSyndrome: A robot, living doll or whatever wanting to become a real human.

Supertrope of {{Transsexual}} and PinocchioSyndrome. Sometimes a SisterTrope of AscendToAHigherPlaneOfExistence. Compare and contrast TheWhitestBlackGuy.



[[folder: Comic Books ]]

* {{ComicBook/Fables}}:
** We have the fox Reynard who is attracted to female humans and wants to become a human so he can seduce them. [[spoiler:This wish is eventually granted by the witches, making him a shapeshifter with a beautiful male human form.]]
** We also have some cases of regular PinocchioSyndrome, with Pinocchio himself and some of the wooden soldiers becoming human.


[[folder: Fan Works ]]

* In Creator/{{Vathara}}'s ''[[https://www.fanfiction.net/s/2698347/1/Walk-Through-the-Valley Walk Through the Valley]]'', [[Manga/RurouniKenshin Hiko]] turns himself into one of the less obvious examples of a CatBoy in fiction. He has retractable AbsurdlySharpClaws hidden under fingernails, InnateNightVision so acute that he's [[BlindWithoutEm blind without]] his CoolShades, [[AlienHair sensory tendrils]], [[KnightTemplarParent parental instincts]] that almost drove him to kill a friend because she didn't smell or feel right, [[TheAgeless eternal youth]] and an interpretation of the original canon's ''ki''-sense that basically makes him TheEmpath. That is, if they could sense trees and animals. Also, he can project images as well as emotion. He's implied to have a hell of a HealingFactor. Making these changes permanent is a felony in the Confederacy—he worked for a hidden branch of its government—and the reader is never given a coherent reason why he'd risk prison and the end of a brilliant career to do this; he and Shakku Arai, his partner-in-crime (literally) had invented anti-aging drugs before he took the serum that would have allowed him to restore his banged up knees and bad back without touching his wrinkles...or the middle-aged spread he must have avoided somehow; he wasn't in do-or-die situation; and then there's this weird line that suggests that even if Hiko isn't consciously aware of any species dysphoria, Arai is:
-->'''Arai:''' I hate what I'm doing, yes,... [b]ut you, Hiko - you hate what you ''are''." (A flicker of humor.) "Or I should say, what you ''were''.
* One joke in the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfic ''FanFic/{{Asylum}}'' has Twilight talking to a donkey who is delusional and believes she's a unicorn.


[[folder: Film ]]

* In Film/{{Avatar}}, [[spoiler:our protagonist takes GoingNative to the logical conclusion, ending the movie with literally becoming a Na'vi]].
* In ''Mammoth'', our [[SubvertedTrope failed]] MightyWhitey protagonist falls in love with a Thai woman and is quite shocked that she thinks men are better then women and that it's okay because she can be a man in her next life if she is good enough. His wannabe-feminist preaching fails to impress her.
* Howard Howe, the main villain in ''{{Film/Tusk}}'' seems to want to be a walrus [[spoiler: since he was rescued by a walrus from a burning boat when he was young]], he talks about it several times while taking on the hero, [[spoiler: instead he makes the hero into a walrus for rest of film]].
* King Louis from ''Disney/TheJungleBook'', an ape wanting to become a human.
* Another Louis, the alligator from ''Disney/ThePrincessAndTheFrog'', wants to be human so that he can play trumpet in a jazz band. [[spoiler:He doesn't become human, but still gets his wish to play in a band.]]
* In the Disney version of ''Disney/TheLittleMermaid'', Princess Ariel of the Mer-people have a fixation with humans, eventually falling in love with a human and becoming one herself. In this version of the story, humans and mer-people are portrayed as equal, so Ariel's transformation isn't about becoming better or worse. The [[Literature/TheLittleMermaid original HC Andersen version]] is not so nice. In this version, it turns out that God loves only mankind, so the Mermaid is doomed from the beginning simply for being born as a "lesser" species. Since her quest in this version was limited to trying to reach out to her LoveInterest, it's not an example of this trope. Oh, and [[DrivenToSuicide it fails miserably, too]].


[[folder: Literature ]]

* One of StephaniePlum's nieces wants to be a pony when she grows up.
* The MerryGentry series has a number of people who want to be sidhe and often mimic them by dying their hair an unnatural red or getting plastic surgery to get their ears pointed. The later is laughed at by real sidhe because only half breeds have pointed ears.
* In the Creator/IsaacAsimov novella (and later film) ''TheBicentennialMan'' the robot "Andrew" desires to be human, so he gets various implants to change his robotic/positronic body & mind into biological parts. He finally gets acknowledged as human by the government, [[spoiler:when he dies of old age]].
* Averted in the Literature/DoctorWhoNewAdventures novel ''Original Sin'' -- it's very popular amongst trendy young humans in the 40th century to undergo radical cosmetic surgery that makes you look like an alien ("body bepple"). The Doctor explains that this doesn't mean they actually ''like'' aliens; like many empires, the Earth Empire has a fascination with its vassal states' cultures but contempt for the bearers of said culture.
* In Cornelia Funke's ''Reckless'', the girl referred to as Fox was given the ability to change into a fox after helping a wounded vixen, and much prefers that form to her original human one. [[spoiler: At least until she realizes that she's fallen in love with Jacob (who is human).]]
* Briefly mentioned in ''Outcast of {{Redwall}}''; Jodd the hare was raised by squirrels and wishes to be one, to the point that he ties his tail to his ears in the hope of stretching it longer.
* The Creator/NeilGaiman short story "Changes" has elements of this. A drug designed to cure cancer has the "side effect" of completely changing a person's biological sex. A biological female who takes the drug will become a biological male and vice versa. It's mentioned that the drug has made sex-change operations obsolete, though some people take it to recreationally change sex.
* In ''[[Literature/{{Discworld}} Reaper Man]]'', the soon-to-be-dying wizard Windle Poons says at his Going-Away Party that he's considering being reincarnated as a woman. His colleagues are a little bit taken aback.
** The Librarian, of course, is perfectly content to remain an ape, even if his transformation from a human wasn't actually by choice. Colleagues who'd known him before are now of the opinion that he was ''always'' an orangutan deep down, he'd just started out looking human due to an accident of birth.
** Discworld dwarfs are facing a kind of cultural revolution of a trans natured kind. Most of dwarf culture centres around stereotypically masculine things, like armour, weapons, drinking and mining. All dwarfs dressed the same, grew their beards long and used male pronouns for themselves. Most of dwarf "sexuality" consisted of finding out what physical sex your boyfriend was before you got married, not that it would change anything. But recently, some dwarfs have been daring to be more feminine. No shaving, obviously, but maybe wearing very slightly lighter chainmail, or a shinier axe. Maybe even lipstick or a chainmail skirt. Of course, since dwarf gender is so optional, it still doesn't mean that they necessarily do have female body parts. Just that they choose to be perceived that way.
** Captain Carrot Ironfounderson, as evidenced by his name, is a dwarf. He is also, through accident of birth, a six-foot tall human king. But he sees no reason why that should stop him being a dwarf, just like adoptive Dads. Nor does he see why some funny crown birthmark, fancy sword and "royal ancestry" should make him have to be King of Ankh Morpork. He would much rather work his way up the ranks of the Ankh Morpork City Watch by the sweat of his brow. This species dysphoria may be what helps him understand Angua, his werewolf girlfriend.
** Speaking of Angua, Discworld werewolves are notably ''not'' "human most of the time". They are ''always'' a werewolf. They just happen to be human-''shaped'' a lot of the time and wolf-''shaped'' at least some of the time. Meanwhile, Wolfmen are the same but the opposite way around. Many werewolves/wolfmen have problems changing shape, in fact. Some can ''only'' change in the moonlight, or not at all, as evidenced by Angua's sister, who could not change into a wolflike shape, and one of her brothers who cannot change into a humanlike shape but chose to pass as a champion sheepdog in Lancre. Apparently werewolves and wolfmen are simply two different examples of the same species (which ''can'' interbreed with human and canine biology).
* The children's picture book ''Goblinheart: A Fairy Tale'' uses this as a [[DoesThisRemindYouOfAnything metaphor]] for {{transsexual}} youth. Julep is a fairy who insists they're a goblin. Julep meets a younger goblin named Tuck who is the opposite.


[[folder: Live Action TV ]]

* In both continuities of ''Series/{{V}}'', alien lizards are evil. Those lizards who side with humanity stop having a real lizard mind, instead developing human personalities/emotions.
* In ''Series/StarTrekDeepSpaceNine'', at least two episodes are about regular humanoid Trill wanting to transition to become "Joined Trill". A Joined Trill is a composite species, with one humanoid component (normally from the Trill race, though a human was briefly joined in one [[Series/StarTrekTheNextGeneration TNG]] episode) and one symbiont. Becoming a Joined Trill brings on many changes, including a form of reincarnation: You retroactively gain past lives in the form of the symbiont's former hosts and their memories, and after your death you will continue to live on as one of these past lives for subsequent hosts.
** Trill must be trained and prepared for a long time before Joining, if they are good enough to be selected, or they may become a person that is far more like past host personalities than the current host's previous personality. Will Riker, who had no idea what symbiosis was like at all, was entirely submerged without realising that there was any alternative. Ezri Tigan, a humanoid Trill who was forced into Joining by circumstance, had at least grown up in a Trill culture and though she experienced a rough and prolonged transition period (full of weird cravings and feelings from her past lives), she kept most of her personality. The most immediately jarring part was that her then boyfriend suddenly reminded her of her ''son'' from a past life, squicking her out and ruining the relationship.
* In ''Series/StarTrekVoyager'', the AI called "The Doctor" as well as the former [[HiveMind Borg]] drone Seven Of Nine are both transitioning. Unlike their predecessor Data from TNG, however, they do not want to become humans. Instead, they are trying to grow into something new, despite the Captain's bias towards the concept of their "humanity" being developed.


[[folder: Tabletop Games ]]

* In ''TabletopGame/{{Shadowrun}}'', elves are a subrace of humanity. Some normal humans are "elf wannabees" who want to be elves, and sometimes use plastic surgery to make themselves more elf-like. They're usually looked down upon by real elves.
** There also exist "ork posers" (which can be both humans and elves). Ork posers can also take this route towards being orks, although the flaw description implies most of them still consider themselves their old race and just want to hang out in ork circles because they're cool. Orks don't discriminate between the two and just find them all annoying.
* In ''TabletopGame/FengShui'', the Ascended are an AncientConspiracy of intelligent animals who used magic to become human, and then took over the world to prevent the same magic from being used to return them to animal form.
* In ''TabletopGame/EclipsePhase'' Body Dysmorphia is not uncommon due to casual use of BrainUploading to switch bodies, and the Fall limiting most people's choices in bodies. Fortunately, bodysculpting, including [[EasySexChange sex changes]], is cheap, but it has limits and bodies are expensive.
** The ''Transhuman'' supplement introduces a variant specifically for [[WithGreatPowerComesGreatInsanity asyncs]], Species Dysmorphia, which causes the afflicted to believe themselves to be some sort of StarfishAlien.


[[folder: Web Comics ]]

* ''Webcomic/GunnerkriggCourt'':
** Reynard the Fox also appears in ''Webcomic/GunnerkriggCourt'', and true to the myth, he fell in love with a human woman. Rather than shapeshifting, however, he convinced Coyote to grant him the power to possess anything with eyes--and he uses it to take the body of a young human male so he can go to the court and woo his beloved...
** There is a Test that, if taken and passed, allows the test-ee to [[{{Metamorphosis}} abandon their old nature and become something new]]. Humans can become animals and move to Gillitie (like the Kershaw family did), while animals and fantasy creatures can become humans and move to the Court (like Red and Blue did).
* ''Webcomic/ElGoonishShive'' features regular genderswapping with the aid of magic and a superscience transformation gun:
** Averted by Justin, who dislikes being temporarily female at a transgender birthday party.
** Averted by Sarah, who enjoys being temporarily male for the party, but is otherwise female.
** Possibly played straight by Susan. Her time as a male apparently felt little different to being female, to her surprise. She also trades uniforms with Tedd, because their school has gender-specific uniforms and they both prefer the opposing gender uniform.
** Played with by Tedd, whose androgynous looks cause people to assume that he is a girl anyway. He developed the genderswapping features on the transformation gun just so that he could actually switch back and forth whenever he wanted to, but mostly because he's a ChivalrousPervert and proud of it. Eventually he is indicated to be gender-fluid, but that he didn't know that was a thing you ''could'' be, and just thought his interest in sometimes but not always being a girl was a result of being raised in an environment with regular contact with shapeshifters and eventually having access to the technological ability to switch sexes.
** Subverted by Grace. She has shapeshifting powers anyway and her sense of self has absolutely no ties to outer appearance in any way.
** Played straight to the hilt by Ellen & Elliot! At first, Elliot was Tedd's much more obviously male friend. He also started off normal to counter Tedd's "MadScientist" theme, though that soon got replaced with a MagicVersusScience theme when he was revealed to be skilled at "Anime Style Martial Arts" including projecting spells from his hands. He gets hit by the "Venus" transformation (becoming an extremely attractive, long-haired girl for a month), he demands that Tedd get him a quicker cure (so as to avoid going to high school with an attractive girl's body for a month). Tedd finds out about a crystal that gets rid of transformative "curses", which should work, since the gun is based on [[AWizardDidIt alien]] {{Magitek}}. They find the crystal and Elliot touches it.
*** Long story short, it split him into two people. "Elliot" who got to keep his name (because he was the male one) gained a hand-beam spell to give people the "Venus" transformation but now has to burn off his excess magical energy once a day by spending a few hours as a woman. "Ellen", who was created from the "curse" that was removed, is permanently a woman now, and only slowly coming to terms with the thought that she might be okay with that. But she still remembers having been a man, mind and body, all her life as well as not being able to date Sarah, the girl she remembers as her girlfriend. She also has the ability to use the anime martial arts but has decided to pursue magic more in order to differentiate herself from Elliot, although she really likes to use her own "Venus" transformation on him.
** Grace's brother, Vlad, is a male bat-human hybrid who can't change into human form permanently because it's too painful. After being hit by Ellen's Venus transformation, he turns into a human woman and is thrilled to be human for once (s/he takes the female part of things in stride, since it matters very little compared to being human).
* ''Webcomic/{{Concession}}'' mentions species change surgery as a one-off joke, then much later introduces the minor character Clarissa who considers herself a human trapped in an anthro hamster's body, so she shaves her fur and blunts her claws. She is on medication for depression, like many transsexuals.
* In ''Webcomic/TwentyFirstCenturyFox'' there's a couple comics in which a male rabbit undergoes species and sex reassignment surgery to become a female skunk (modeled after the protagonist of Webcomic/SabrinaOnline). One of the surgeons states that technology has advanced to the point where they cloned the appropriate reproductive organs for her, but any kits she bore would be rabbits rather than skunks, and the tail was bionic.
* ''Webcomic/KevinAndKell'':
** Bruno is a wolf who identifies as a herbivore, eventually getting surgery to install extra stomachs.
** While Angelique initially became a rat for legal reasons, she later says she feels more comfortable than she did as a rabbit.
* In ''Webcomic/{{Shortpacked}}'', when Ultra-Car becomes a RobotGirl, she calls herself "trans-chassis".
* ''Webcomic/SkinHorse'':
** When the team first meet Nick, they conclude that because he's human (albeit one whose had his brain removed and stuck in a helicopter) his problems don't fall under their purview. When he refers to the helicopter as his "real body" they decide that since he ''identifies'' as non-human he should be treated as such.
** Goes the other way in the "Grillo Parlante" storyline, where Nera and Jonah meet a support group for transgenics who not only identify as normal humans but are trying to will themselves into developing a WeirdnessCensor.


[[folder: Western Animation ]]

* In ''WesternAnimation/TheBoondocks'', When [[BoomerangBigot Uncle Ruckus]] dies, [[http://www.youtube.com/watch?v=jRNCpD3xhsY he will finally become a real white man in the heaven for white racists]].
* ''WesternAnimation/TeachersPet'' is about a dog who wants to be a boy.
* The ''WesternAnimation/SouthPark'' episode "Mr. Garrison's Fancy New Vagina" is about this trope and later {{downplayed}} it, focusing not only on the title character, but on [[spoiler: Kyle and his dad as well.]] Mr. Garrison gets a "vaginoplasty" to become a woman, [[spoiler: Gerald]] gets a "dolphinoplasty" to become a dolphin, and [[spoiler: Kyle]] gets a "negroplasty" to become tall and black. In the end, Mr. Garrison wanted a "peniplasty" to become a man again after realising that he's "just a guy with a mutilated penis". However, his genitalia was used for surgically altering [[spoiler: Kyle and Gerald]], and [[spoiler: since his testicles were used for Kyle's knees, they break]], leaving Mr. Garrison as a woman until he grew new genitalia on a mouse.
-->'''Doctor''' ''(on negroplasty)'' It's a fairly common procedure, really. Just the reverse of a caucasioplasty just like Music/MichaelJackson had.
** Afterwards, in the case of [[spoiler:Kyle and his dad]], this was never mentioned again [[WildMassGuessing possibly due to using Garrison's sexual parts]].
* One episode of ''WesternAnimation/ThePowerpuffGirls2016'': features a colt who wants to be a unicorn. Bubbles gets the Professor to turn him into a unicorn but it backfires and he transforms into a monstrous looking creature. [[spoiler:Eventually his mother appears and informs him he really was a unicorn the entire time, it's just his mane covered up his horn]].


[[folder: Real Life ]]

* [[{{Transsexual}} Trans]] people are assigned a gender at birth, usually based on their physical sex, that does not match their self-identified gender later in life. Sometimes occurs due to Intersexuality, i.e. physically being in between male and female or not fitting easily into one or the other, or on rare occassions when something happens to their genitals such as a botched circumcision. Most often the infants are assigned to be female. The whole situation is [[FlameBait very contentious in the Trans community]].
* There are also religious examples, mostly tied to belief in reincarnation -- since men have higher social status, many Hindu and Buddhist women openly hope to be male in the next life, while still having an entirely female gender identity in ''this'' life.
** That kind of "trans nature" is pretty common in patriarchal cultures. In some rural regions of Albania, women can, if they have no brothers or other male relatives, go through a ritual that makes them men for the purpose of the law, and enables them to get all the benefits awarded to males. At the price of never being able to have children. Those women are usually not trans as it is understood in the medical sense, they're fine with a female body, just not with the oppression they are subjected to - and sometimes they're forced to officially change gender because the family needs a male head. It is slowly dying out as society becomes more equal.
* Otherkin. To quote WikiFur, "Otherkin are those who believe that their physical forms do not define or fully encompass their mental states, personality, psychology, or spiritual nature." See the full article [[http://en.wikifur.com/wiki/Otherkin here.]]
** And some [[UsefulNotes/FurryFandom furries]] or "Furry lifestylers" as well. These most often take the route of reincarnation much like the aforementioned religions or people waiting for biotechnology to become real life PettingZooPeople. Comparing them to the above Transsexuals is considered a BerserkButton to most trans groups.