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[[quoteright:330:[[Film/TheExorcist https://static.tvtropes.org/pmwiki/pub/images/ExorcistBeforeAndAfter_758.jpg]]]]
[[caption-width-right:330:On the bright side, she can declare the demon as a dependent come tax season.]]

->''"His outer battle-plate exploded outwards, revealing a new, sinuous underbody of violet flesh and black veins. His stature swelled to obscene portions until he towered over them. Arms, four of them, corded and bound with leather, unravelled in place of his own, and horns erupted, twisting, from the bones of his dissolving face. He took a first step, and instead of a heavy-tread boot, a cloven hoof cracked the deck".''
-->--''Literature/HorusHeresy'', ''Path of Heaven''

Being [[DemonicPossession demonically possessed]] [[WillingChanneler rarely]] [[SuperEmpowering works out]] [[PowersViaPossession well]] for the [[HeroicHost host]], however, every once in a while things go FromBadToWorse. Perhaps it's just that EvilMakesYouUgly, EvilMakesYouMonstrous, or that [[GrandTheftMe your body is]] [[EmpathicShapeshifter the plaything of the mind]], but when the body your mother gave you has a new landlord there is a nasty tendency for you to be [[{{Shapeshifting}} remodeled]], and [[BodyHorror possibly]] [[ShowingOffTheNewBody shown off]].

Sometimes justified in narration as the host becoming the new body of the guest either as an intrinsic feature or as a deliberate action on the part of the guest. In extremely unfortunate cases, the host body also suffers from PossessionBurnout which will quickly destroy it.

Compare and Contrast: GlowingEyesOfDoom, PowerUpgradingDeformation, RedEyesTakeWarning, and ViralTransformation.

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!!Examples:
[[index]]
* TransformationOfThePossessed/AnimeAndManga
* TransformationOfThePossessed/FanWorks
* TransformationOfThePossessed/{{Literature}}
* TransformationOfThePossessed/LiveActionTV
* TransformationOfThePossessed/VideoGames
[[/index]]

[[foldercontrol]]

[[folder:Comic Books]]
* ''ComicBook/{{Annihilators}}: Earthfall'': Anyone possessed by [[ComicBook/Warlock1967 the Magus]] gains his distinctive purple skin, red eyes, and white hair.
* ''ComicBook/JudgeDredd'': The Dark Judges tend to possess people solely to asssist them in finding new corpses for their spirits to occupy after the destruction of the previous one, but Judge Mortis once possessed the Chief Judge and directly decayed his body into the cow-skulled monster that he is.
* ComicBook/IronMan villain Fin Fang Foon an [[NinjaPirateZombieRobot alien shapeshifting dragon kaiju space navigator]] was killed, at least once, only to possess a convenient human to [[SelfConstructedBeing transform]] into his default form notably by assimilating earth reptiles.
* ''Franchise/WonderWoman'':
** ''ComicBook/WonderWoman1987'': When Deimos possesses ComicBook/TheJoker, the fear god transforms the Joker's hair into venomous snakes and his feet into the taloned things Deimos himself possesses.
** ''ComicBook/WonderWomanWarbringer'': When Phobos, Deimos and Eris possess humans to take form in the human world, those they are possessing are altered to look like the war gods within a minute or so, with their eyes turning into pupil-less light sources first.
[[/folder]]

[[folder:Films -- Live-Action]]
* In ''Film/{{Casper}}'', Dr. Harvey, shortly after getting possessed by the Ghostly Trio, is morphed into Clint Eastwood, Rodney Dangerfield, Mel Gibson, and the Crypt Keeper. [[note]]The movie, however, does not exactly make it clear as to whether these changes are actually happening, or if it was all just a hallucination.[[/note]]
* When [[spoiler:Carolyn]] is possessed by the ghost of Bathsheba in ''Film/TheConjuring,'' her body visibly distorts to more closely resemble the witch, including a more prominently hooked nose, straightened and ruined hair, and wounds opening on the skin. Most of these, except the wounds, vanish almost instantly when she is banished.
* Happens twice in ''Film/{{Constantine}}''. In the beginning, when the soldier demon inhabits the young woman her face is covered with blotches. When [[spoiler:Angela Dodson]] is possessed by Mammon (Lucifer's son) near the end the change is much greater. In each case, once the possession ends the skin changes disappear.
* In ''Film/DemonKnight'', this is the fate of everyone possessed by demons. The last transformation in the film [[spoiler:of a young boy]] is especially grotesque.
* This is what happens to June Moone in ''Film/SuicideSquad2016'' whenever she transforms into the Enchantress. Once the Enchantress is killed off by Task Force X, June bursts out of the skin of her possessor.
* ''Film/TheDevilInside'' plays it straight, but in fairly plausible ways. Those possessed sport freakish flexibility, dilated eyes (a line of dialogue indicates that the human eye can dilate to 9 mm, 11 mm under the influence of some drugs, but possession can force it further), and red eyes. All could be explained by actual physical symptoms.
* The Kandarian demons in the ''Franchise/EvilDead'' series use this in a variety of ways.
** In [[Film/TheEvilDead1981 the original film]] the only change was in the eyes (and spreading black veins in one case), but physical damage inflicted on the host quickly reached gruesome levels.
** ''Film/EvilDead2'' had a greater degree of BodyHorror, including a possession victim with an ''extremely'' long neck.
** ''Film/ArmyOfDarkness'' had [[spoiler:Sheila]] acquire ghostly pale, mottled skin, sunken eyes and a heavier brown when [[spoiler:she]] was possessed; the rest of the Deadites (particularly Evil Ash) took on a rotted appearance (even without any injuries).
** Finally, [[Film/EvilDead2013 the 2013 remake]] only gives the possessed yellow eyes by default, but they then inflict gruesome injuries on ''themselves'', apparently to match the documented appearance of whatever spirit is possessing them.
* ''Film/TheExorcist'' has a pretty gruesome transformation when the demon Pazuzu manifests within Regan.
* ''Film/Ghostbusters1984'': When Dana Barrett and Louis Tully become possessed by Gozer's demonic Terror Dogs, they don't just gain demonic powers such as levitation, telekinesis, and glowing red eyes. Upon completing their demonic tasks Dana and Louis transform into the monstrous hellhound forms of their possessors.
* ''Film/{{Legion}}'': various angels do ''odd'' things to the bodies they inhabit.
* ''Franchise/TheMatrix'': The Agents are Machine programs who manifest inside the Matrix by taking over the bodies of people who are still plugged into the program, which alters their physical appearance to that of the agent. Obviously, it's easier for them to do since the whole thing is a simulation. If an Agent is ever killed (no small feat), [[ThisWasHisTrueForm their host body turns back]].
* A flashback in ''Film/MightyMorphinPowerRangersOnceAndAlways'' has Robo-Rita possessing Alpha 8 and instantly transforming him into her current form.
* ''Film/ANightmareOnElmStreetPart2FreddysRevenge'': Every time Freddy possesses Jesse, he forcibly converts Jesse's body into his own form.
* Happens to the Chosen One in Creator/JohnCarpenter's ''Film/PrinceOfDarkness''. Satan, in the form of an evil green fluid, enters the mouths of his victims to control them, but the Chosen One ingests the lion's share of the fluid and becomes the [[GrandTheftMe personal vehicle of Satan himself]] (This causes said Chosen One's body to appear progressively rotten and decayed as the movie goes on).
* ''Film/{{Scalps}}'' features transformations whenever the homicidal spirit possesses a victim.
* In ''Film/WarCraft2016'', fel magic's calling card is its mutation of everyone who comes in direct contact with it.
** The orcs empowered by Gul'dan turn green.
** Blackhand, when empowered by Gul'dan, regrows his hand around the claw he's been wearing on the stump of the previous one but with sickly-looking flesh, grows skin on the spines he's been using as a cape, and looks less orcish and more bestial, with more teeth among other things.
** Gul'dan himself sprouts a crown of horns on his back from oft usage of fel.
** When he's fully corrupted, [[spoiler:Medivh's skin wrinkles and turns dark blue, and he starts to sprout horns from his chin]].
[[/folder]]

[[folder:Radio]]
* ''Radio/BleakExpectations:'' When Mr. Benevolent comes back from his second death by possessing a medium, he physically transforms her into his own form. When that goes wrong, the medium's still-possessed remains are eaten by a pigeon, and Mr. Benevolent takes over that, and uses it to try and work his way back to humanity. He does admit that there are still some pigeon atavistic urges he's [[TheMindIsThePlaythingOfTheBody unable to completely resist]].

[[/folder]]

[[folder:Tabletop Games]]
* In ''TabletopGame/DemonTheFallen'', Demons knowledgeable in the lore of transformation can make permanent alterations to its host.
* ''TabletopGame/DungeonsAndDragons'' 3.5 & 4.0: Many fiends find remodeling their new body to their advantage and extensive remodeling can result in being completely replaced.
* In ''TabletopGame/{{Ravenloft}}'', this is how fiends gain physical form in the Domains of Dread, in a process known as Transposition. It is a five-step process that gradually transforms the body of the fiend's victim, advancing in a manner similar to how a person can be corrupted in Ravenloft by committing acts of evil, before culminating in the final step where the fiend takes the place of the victim on the Material Plane and condemns the victim's soul to an awful fate in the Outer Planes. Because of the nature of the Domains of Dread, this is just as much of a trap for the fiend involved as any other evil being caught in the Mists.
* ''TabletopGame/Warhammer40000'':
** Daemons will alter the body of their host, moulding it into one more suitable for them. The host rarely lasts for very long. They can do this to things as well as people, by the way, as even machines in this setting have souls to devour. Swords, guns, [[HumongousMecha giant robots]], city-sized, planet-wrecking starships, ''entire sodding planets...''
** Lucius the Eternal, the Champion of Slaanesh, gets his epithet because whoever kills him and feels the slightest twinge of pride over it slowly turns into him. Once the transformation is complete, the killer is [[AndIMustScream just another screaming face trapped in Lucius' armor.]]
* The Fomori in ''TabletopGame/WerewolfTheApocalypse''. When a bane (an evil spirit of the Wyrm) possesses a human body, that person's body is hideously mutated with whatever the Storyteller picks from a grab-bag of disgusting BodyHorror-based powers. Examples include multiple limbs and mouths, corrosive puss boils, and internal organs replaced by infectious fungus.
* Likewise, the spirits in ''TabletopGame/WerewolfTheForsaken'' can do this to their hosts, but only at the point where they've either destroyed the host's consciousness or irreversibly taken over their soul. In any case, the body starts to take on elements of the spirit possessing it -- for the Hosts, this is usually the creature the Host derives from (examples include spiders, rats, crows, worms, fungi, etc.), but for the Spirit-Claimed, the possessed takes on elements of its nature (a fire elemental will give its host bright eyes and blisters, a death spirit will make its host look gaunt, etc.).
* ''TabletopGame/YuGiOh'':
** Present in the lore for the "Mermail" series of monsters. Getting too full of himself, Emperor Poseidra put on a golden bracelet with the power to control the weather valued as the great treasure of his people. [[DemonicPossession Poseidra's body was taken over by the king residing in the bracelet]] and instantly his body began to change. It wasn't long before Abyssgaios, the Mermail King spoken of in legends, appeared and eliminated the Atlantean army with ease. Abysstrite, the Mermail Queen, appeared to have [[SealedBadassInACan sealed the bracelet away]] because [[HumanSacrifice the advent of the king required a sacrifice]].
** Krocodilus is forcibly transformed into Graydle Crocodile in the artwork for Graydle Parasite.
[[/folder]]

[[folder:Visual Novel]]
* This is how the Kurain Spirit Channeling system works in the ''Franchise/AceAttorney'' titles. It comes in handy more than once, allowing a widow to see, hear and speak to her fallen husband one more time, [[spoiler:allows a medium to hide from a vengeful spirit that wants them dead]] and [[spoiler:allows a spirit to hide the fact that they have died from a friend of theirs, in order to keep their spirits up]].
[[/folder]]

[[folder:Web Animation]]
* ''WebAnimation/MysterySkullsAnimated'': Arthur starts turning green when he's possessed by the spirit of the cave, his [[BlackEyesOfCrazy sclera turn black]], his iris turns green and glowing and his teeth start to turn sharper before Mystery [[AmputationStopsSpread tears off his arm]].
[[/folder]]

[[folder:Webcomics]]
* ''Webcomic/ArchieSonicOnline'': Ixis Naugus is still in possession of Geoffrey St. John's body. Unfortunately for Naugus he involuntary keeps on slowly reverting back to his old form.
* ''Webcomic/CharbyTheVampirate'': Zeno's eyes turn glowing red and his wings and horns grow when he is taken over by the wraith.
* ''Webcomic/DaughterOfTheLilies'': A corpse or living being possessed by a drath spirit is quickly twisted and warped into unnatural shapes. The first example seen is of a white mouse that turns gray and has its head twisted upside down while its mouth grows to cover most of its neck; later examples include cyclopean or many-eyed creatures, a three-headed bird, and a cat with human hands.
* ''Webcomic/ElGoonishShive'': When [[spoiler:Magus]] [[http://egscomics.com/comic/2017-11-10 takes over]] [[spoiler:Elliot]]'s body, it turns his hair light blond.
* ''Webcomic/{{Housepets}}'': When WillingChanneler Tarot is possessed by Dragon, the goddess can choose to speak through Tarot's body (which turns her eyes green and allows Dragon control) or to transform her body into Dragon's entirely. This is what leads Peanut to believe that Tarot is shapeshifting ''into'' a dragon, rather than being possessed by a different entity entirely.
* ''Webcomic/LiesWithin'': The [[OurSpiritsAreDifferent Wraith]]'s hosts gain BlackEyesOfCrazy, [[ScaryTeeth sharpened teeth]], and [[HornsOfVillainy horns]] that grow and shrink in proportion to the Wraith's influence on them. A host who's been reduced to a MeatPuppet has [[https://www.lieswithincomic.com/comic/page-18 a full set of antlers]], while Lys has none at all most of the time.
* ''Webcomic/{{Nebula}}'': When Black Hole possesses someone, their appearance warps, spikes emerging from their body in random places and their hands shifting to have two thumbs each. And sometimes, the changes are more... [[MultiArmedAndDangerous extreme]].
* ''Webcomic/TheOrderOfTheStick'': [[spoiler:Vaarsuvius]] takes on a demonic appearance after being [[http://www.giantitp.com/comics/oots0635.html Soul Spliced]] with three epic-level casters.
* ''Webcomic/OurLittleAdventure'': Emily takes on a horrid alien appearance as some kind of controlling, [[spoiler:Angelo-loyal]] parasite inside her takes control of her body.
* ''Webcomic/{{Paranatural}}'':
** The host of a spirit (whether human or object) will gradually begin to look like its host, albeit in barely significant ways.
** Isaac's only manifestation is his hair, which is [[http://www.paranatural.net/index.php?id=113 SPIKY ALL ON ITS OWN]]
** The lizardman seen in the Activity Consortium appears to be the [[http://www.paranatural.net/index.php?id=168 subject of an extended possession.]]
* ''Webcomic/RedSpaceBlues'': AMI [[http://redspaceblues.com/?comic=red-space-blues-27 takes over an enemy soldier by first impaling, and then replacing, his head with her own]].
* ''Webcomic/SomethingPositive'': When characters are (possibly) possessed by the spirit of the homicidal colour-changing cat Twitchy-Hug (it all MakesJustAsMuchSenseInContext), their clothes start changing colour.
[[/folder]]

[[folder:Web Originals]]
* Noted in the Literature/WhateleyUniverse as one possible consequence of a low-powered Avatar-type mutant hosting a too-powerful spirit as the spirit will make changes to the Avatar's body to make itself more comfortable. And the [[HeroicHost Avatar]] trait is ''already'' all about being superhumanly good at this sort of thing...
[[/folder]]

[[folder:Western Animation]]
* In ''WesternAnimation/AdventureTime'', [[ArtifactOfDoom the Ice Crown]] causes a physical transformation in its wearer, whom it tries to impose its own will on. As the person falls further and further under the Crown's control, they begin to develop blue skin, long white hair, and fangs (although some of these traits can vary depending on circumstance).
* In ''WesternAnimation/BatmanBeyondReturnOfTheJoker'', [[spoiler:the Joker is actually Tim Drake acting under the control of an implanted chip containing Joker's personality, memories, and genetic information. When the Joker chip takes control, it transforms Tim into a clone of the Joker. "Joker" has access to all of Tim's memories in addition to his own and can even make his voice sound like Tim's (which he does to keep Tim's wife from being suspicious of her husband working late hours). "Joker" tells Terry that while he still has to revert to Tim Drake every now and then, he's getting stronger and soon will be able to maintain control full-time. Thankfully, Terry is able to destroy the chip and free Tim from the Joker's control.]]
* ''WesternAnimation/Ben10AlienForce'': When Zs'skayr takes over Vilgaxia in "[[Recap/Ben10AlienForceS3E10GhostTown Ghost Town]], everyone he possesses gets linked into his HiveMind, and gains his original Ghostfreak appearance. Luckily, Kevin's mutation makes him immune to this. Ben plays this trope more literally by ''willingly'' getting possessed to allow the Omnitrix to scan Zs'skayr's DNA, then quickly turning into Ghostfreak with the Omnitrix. This goes about as well as you might expect.
* ''WesternAnimation/TheBoondocks'': When Tom is possessed by Stinkmeaner, his {{Animesque}} eyes are changed into BlackDotPupils and gains dark circles around them, befitting the deranged psychopath possessing him.
* After being possessed by Zordrak in an episode of ''WesternAnimation/TheDreamstone'', Amberley gains a pair of extremely evil looking glowing eyes.
* In the ''WesternAnimation/GravityFalls'' episode "Sock Opera", when Dipper is possessed by [[EldritchAbomination Bill]], he gains creepy yellow eyes, and teeth that should probably not be on an animated character.
* ''WesternAnimation/JackieChanAdventures'': The ghost of Shendu (a [[NinjaPirateZombieRobot dragon-demon-wizard]]) usually gives his host glowing red eyes when in control. While he's not capable of transforming his host's body under his own power, he once tried to do so ''manually'' with potions, and when he is in control, will [[RobeAndWizardHat dress as befits a demon sorcerer]], to his host's chagrin.
* In ''WesternAnimation/TheLegendOfKorra'', when a human is possessed by a spirit, the human's body starts to change to resemble the spirit. [[PossessionBurnout If the spirit stays inside too long, the host will die.]]
* ''WesternAnimation/TheOwlHouse'': [[spoiler:When Belos possesses Hunter, his cursed slime covers large patches of Hunter's body, antlers sprout from his head, his eyes glow electric blue, and his arms become long and stretchy, able to extend to many times the length of his entire body. Hunter managed to throw him out of his body, but while he lost the antlers and the stretchy arms, he was left CoveredWithScars and barely clinging to life.]]
* Happened a few times in ''WesternAnimation/TheRealGhostbusters'', most notably in the episode 'If I Were A Witch Man', where we see the ghostly-witch Kestral possess two people -- one of which being Egon Spengler -- and she turns their bodies into the old stereotypical witch look (or in Egon's case, an old man).
* ''WesternAnimation/{{Wakfu}}'': When a shushu possesses someone, they take on the physical traits of the shushu's true form, making them look like a fusion between the two in most cases.
** An interesting case occurs when Anathar possesses [[spoiler:Adamai]]. It seems like the transformation isn't solely due to his own power but also because he's exploiting and supercharging the natural shapeshifting abilities of his host. The result is a drooling grotesque mockery [[spoiler:of a full-grown dragon]] with eyes all over its body that is strong enough to face Phaeris the Powerful in single combat.
[[/folder]]

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