When the body your mother gave you has a new landlord there is a nasty tendency for you to be remodeled, and possibly shown off.

Parodied: Alice the ghost possesses Bob the Human. Gender bending and awkwardness ensues. The transformation even includes Bob's Clothes and other possessions.

Times where being possessed causes the vessel to transform in Fan Works.Crossovers In Avengers: Infinite Wars, after Karness Muur takes one of Kaecilius& …

Times where being possessed causes the vessel to transform in Video Games. In Diablo, this happens to Prince Albrecht when he is possessed by Diablo, ...

While Billy was researching a way to get Zordon back, the Z-Wave particles found somehow went to Alpha-8. This resulted in the creation of Robo-Rita.

In The Inheritance Cycle, when a human is possessed by spirits and becomes a Shade, it transforms their appearance, including turning their hair bright crimson.

Times where being possessed causes the vessel to transform in Anime and Manga. Animals possessed by spirits in Berserk get deformed human-like faces.

Times where being possessed causes the vessel to transform in Literature. The Big Bad of Heralds of Valdemar is a long-dead sorcerer.

Times where being possessed causes the vessel to transform in Live-Action TV series. Demonic possessions eventually tend to disfigure the host in Buffy the ...

Transformation Horror is a subtrope of Body Horror involving graphic and unsettling transformation sequences (not the trope) or continuous random mutation.