Transformation of the Possessed

Being Demonically Possessed rarely works out well for the host, however, every once in a while It Gets Worse. Perhaps it's just that Evil Makes You Ugly, Evil Makes You Monstrous, or that your body is 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 remodeled, and possibly shown off.

Sometimes justified in narration as the host becoming the new body of the guest either as a intrinsic feature or as a deliberate action on the part of the guest

Compare and Contrast: Glowing Eyes of Doom, Red Eyes, Take Warning and Viral Transformation

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Examples:

Anime and Manga

• Apparently happens in Ao No 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.
• Happens with Orochimaru's hosts in Naruto.
  • When Naruto has a demon cloak with 4 or more tails, the Nine-Tailed Fox is controlling him.
• The 2003 anime version of Fullmetal Alchemist had Dante's deterioration with each possession.
• Animals possessed by spirits in Berserk get deformed human-like faces
• In Bleach, when Kaien is possessed by Metastasia, he first gets hollowed, empty eye-sockets, then he starts sprouting tentacles from his limbs, sockets and mouth.
• In Soul Eater, when Medusa loses her body, she possesses a young girl and twists her appearance into a younger version of herself.
• In Dragon Ball GT, after Baby takes over someone's body, he gradually alters it more and more over time until it almost completely resembles his own.

Film- Live Action

• Legion: Various angels do odd things to the bodies they inhabit.
• The Exorcist had a pretty gruesome transformation.
• The deadites in the Evil Dead franchise have varying versions of this.
• Angela in the Night of the Demons trilogy. And anyone she possesses.
• Dr Harvey in Casper.
• Happens twice in Constantine. In the beginning, when the soldier demon inhabits the young woman, her face is covered with blotches. When 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.

Literature

• True for most Denarians in The Dresden Files, though some of them choose to keep their human appearance.
• Played With in Perelandra, Dr. Weston's possessed body at first looks quite normal, but as it is damaged beyond repair in the course of the plot (yet continues to move thanks to the devil inside it), it becomes horrible to look at and wholly inhuman.
• 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.
• Professor Quirrell from Harry Potter and The Philosopher's Stone, a Death Eater who's physically merged with Lord Voldemort.
• Spellbent: Possession victims get funky eye colors. Their sclera (white of the eyes) turns red or, in some cases purple, depending on the power level of what's possessing them.

Live Action Television

• In Star Trek: Deep Space Nine, when the Pa-Wraiths possess someone, the person's scleras become red.
• In Kamen Rider Den-O, being possessed by any of the friendly -taro imagine gives the character a lock of appropriately colored hair and sometimes a change in wardrobe.
• Demonic possessions eventually tend to disfigure the host in Buffy the Vampire Slayer and Angel.

Tabletop Games

• Dungeons and Dragons 3.5 & 4.0: Many fiends find remodeling their new body to their advantage and extensive remodeling can result in being completely replaced.
• In Warhammer 40000, Daemons will alter the body of their host, moulding it into one more suitable for them. The host rarely lasts for very long.
• In Demon: The Fallen, Demons knowledgeable in the lore of transformation can make permanent alterations to its host.
• The Fomori in Werewolf: The Apocalypse. 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 Body Horror-based powers. Examples include multiple limbs and mouths, corrosive pus boils, and internal organs replaced by infectious fungus.

Video Games

• Legacy of Kain: Raziel learns to occupy corpses and shape them into an image of himself
• This happens to anyone possessed by a demon in Dragon Age.
• In Diablo 2, this happens to the first game's protagonist when they fail to contain Diablo's soul.
• When an Ing from Metroid Prime 2 fuses itself to a host, the host takes on a darker, mutated appearance as a direct result.
• In Doom 3 (and quite possibly the old Doom games), demonic possession turns people into zombies.

Web Comics

• Vaarsuvius from Order of the Stick takes on a demonic appearance after being Soul Spliced with three epic-level casters.
• This is a side effect of a spirit's recovery in Paranatural. A mortally-wounded spirit will hide in an object or person to recover, and as it gains its health back, whatever it possessed looks more like the spirit. Isaac O'Connor, a medium, explicitly states his spiky Anime Hair is due to his possession.

Western Animation

• Jackie Chan Adventures: Shendu, a dragon-demon-wizard, wanted his current host Valmont to get scales. However, it was not a direct effect of the possession; he had to use potions for that.
• After being possessed by Zordrak in an episode of The Dreamstone, Amberley gains a pair of extremely evil looking glowing eyes.