Times where being possessed causes the vessel to transform in Anime and Manga.
- Animals possessed by spirits in Berserk get deformed human-like faces. The cultists in the Conviction arc also undergo a transformation when the spirits possess them.
- In Bleach, when Kaien is possessed by Metastasia, he first gets hollowed, empty eyesockets, then he starts sprouting tentacles from his limbs, sockets and mouth.
- Apparently happens in Blue Exorcist. Father Fujimoto is definitely an example. So is Toudou, later on, although it does seem to depend on how powerful the demon in question is. Basically, all the demons seen were originally non-supernatural things from Assiah, with every monstrous or odd specificity caused by this trope.
- The Curse of Kazuo Umezu: Masami has a sharp-toothed demon that comes out of her neck in "What Will the Video Camera Reveal?".
- Dragon Ball GT: Once Baby chooses Vegeta as his permanent host body, he slowly does this to Vegeta. At first, it's just Facial Markings and white hair, but as Baby becomes more powerful, eventually Vegeta looks nothing like himself.
- Dragon Ball Super: Watagash is able to possess others and shift their forms, the transformation depending on how much evil and hatred the host has in their heart. When he possesses Barry Khan, he shifts into a large ape-like form, and then a Kaiju-sized reptilian beast that no longer resembles Khan at all.
- Taken to extreme proportions in Fullmetal Alchemist. When Envy is reduced to their parasite form they persuade May to go to the catacombs under central where they are attacked by a hoard of mannequin soldiers. During the chaos Envy manages to possess not one, but all of the monsters and proceeds to assimilate them, turning the mass of mannequin soldiers into their true form and then into their preferred form.
- Kagerou Project: This happens to Konoha when he is possessed by the series' Big Bad, The Wide-Open Eyes Snake; the transformation turns his hair, shirt and boots black, makes his skin even paler, and turns his eyes bright yellow. The manga also adds scales to his design, to make it more clear who's possessing him.
- Mob Psycho 100: Dimple the spirit is a non-villainous example (at least after getting curb-stomped by Mob). Whenever he possesses a host, said host gains his signature Blush Stickers.
- Naruto:
- Happens to Gaara during the Chuunin Exams when he (purposely) goes to sleep and lets Shukaku take over. Naruto has to (literally) beat some sense into him.
- The Edo Tensei technique works by taking some genetic material of a deceased person and forcing them into a still-living body. This transforms the host's body into that of the deceased person's, killing the host in the process but allowing the body to become animate.
- The bodies of Orochimaru's hosts change to have the same pale-white complexion as he does, then he uses a shapeshifting technique to get a Shapeshifter Default Form identical to his original body.
- When Naruto has a demon cloak with four or more tails, the nine-tailed fox is controlling him.
- In Chapter 679, Black Zetsu/Kaguya inflicts this upon Madara.
- The standard Monster of the Week of the Pretty Cure series is a possessed object transformed into a rampaging beast which the heroines fight, defeat and purify. The level of transformation of the objects greatly vary within the series, sometimes to the degree the monster barely resemble the object it controls i.e an electrical transformer tower Zakenna that looked like a Kaiju, a trolley Kowaina with the likeness of a pudgy penguin and a catching net Nakewameke with the appearance of a stereotypical mariachi, complete with Gratuitous Spanish (¡AMIGO!) to name a few.
- Sailor Moon: Season 3's Mistress 9 has the transformation come in stages. While relatively dormant, her host, Hotaru, grows steadily weaker and while in (brief) periods of direct control, undergoes an Evil Costume Switch and Glowing Eyes of Doom with Face Framed in Shadow. After gaining complete control, however, she ages Hotaru's body into her mid-20's,grows her hair down to the floor and starts wearing an all black outfit.
- In Soul Eater, when Medusa loses her body, she possesses a young girl and twists her appearance into a younger version of herself.
