'''Basic Trope''': A character suddenly changes with no explanation whatsoever.
* '''Straight''': Bob, formerly a NiceGuy, suddenly starts [[KickTheDog kicking the dog]] and becomes a huge {{Jerkass}}.
* '''Exaggerated''': Bob, formerly IncorruptiblePurePureness, becomes a CompleteMonster.
* '''Downplayed''':
** Bob, a [[JerkWithAHeartOfGold normally is nice if a little crass at time]], starts dropping cluster F bombs.
** OutOfCharacterMoment
* '''Justified''':
** Bob has split personality disorder.
** CharacterizationMarchesOn
* '''Inverted''': StaticCharacter
* '''Subverted''':
** Bob, the resident NiceGuy, seems to have become a {{Jerkass}}. However, it turns out that it's actually Bob's identical twin brother berating everyone - Bob himself is just as nice as ever.
** CharacterRerailment
* '''Double Subverted''': However, it turns out that Bob has secret evil plans, and his kindness is [[FauxAffablyEvil merely a facade]].
* '''Parodied''': Bob constantly switches between TheHero, BigBad, AntiHero, AntiVillain and various other roles in the course of a single episode/book/game.
* '''Zig Zagged''':
** Bob was previously a NiceGuy, then he acts like a {{Jerkass}}. But it turns out to be someone else. But they're covering up for his secret evil plans, which turn out to be [[WellIntentionedExtremist well-intentioned but extreme]].
** Bob's personality [[DependingOnTheWriter varies by episode]].
* '''Averted''': Logical CharacterDevelopment takes place in the course of the work.
* '''Enforced''':
** The new writing team wants to establish that [[WriterOnBoard all good-hearted people have no problem with X]]. Since [[JerkWithAHeartOfGold jerkish but otherwise helpful sidekick Bob]] mentioned two years ago in passing that he has a problem with X, he [[FaceHeelTurn joins forces with all other characters who dislike X]] and [[KnightTemplar crusades ceaselessly for all X to be destroyed forever]].
** Bob was TheScrappy, so the writers change his character in an attempt to [[RescuedFromTheScrappyHeap make him more popular.]]
* '''Lampshaded''': "Bob isn't how he used to be, is he?"
* '''Invoked''': "I'm going to be a changed man!"
* '''Exploited''': ???
* '''Defied''': ???
* '''Discussed''': ???
* '''Conversed''': ???
* '''Deconstructed''': Fans who liked Bob's previous characterisation resent his changes so much that they abandon the show entirely.
* '''Reconstructed''':
** The writers decide to return Bob [[CharacterRerailment to his previous characterisation]], thus restoring the work to its former glory.
** Alternatively, fans begin to see the merits of Bob's new personality as well, and thus start watching again.
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[[NiceGuy Hi there, Pal.]] Would you allow me to assist you on going back to {{Charact|erDerailment}}-...*poof*...Ha! [[TookALevelInJerkass I'm not helping you at all, sucker!]]
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%% Optional items, added after Conversed, at your discretion:
%%
%%* '''Implied''': ???
%%* '''Plotted A Good Waste''': ???
%%* '''Played For Laughs''': ???
%%* '''Played For Drama''': ???