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* ''Comicbook/{{Azrael}}'': Jean-Paul Valley's stint as Franchise/{{Batman}} during the "Knightquest" portion of the ''ComicBook/{{Knightfall}}'' storyline was this. After being doused with the Scarecrow's Fear Gas, the hypnotic trance known as The System kicked in, haunting Jean-Paul with images of his father and of Saint Dumas, the "creator" of the order he once was part of. As he's haunted by these apparitions, The System drives him to be more brutal and continuously modify the Bat-Costume, the pinnacle being when he allowed Abbatoir to die, condemning his captive to death, modifying the Bat-Costume to the point where it was less Batman and more Azrael and outright kicking [[Comicbook/RobinSeries Robin]] out of the Batcave and working against him, alienating Commissioner Gordon, and ''Bruce Wayne'' and deciding that all criminals need to be put out of their misery. It's at that point that Bruce decides enough is enough and sets out to take back the Mantle of the Bat.

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* ''Comicbook/{{Azrael}}'': Jean-Paul Valley's stint as Franchise/{{Batman}} during the "Knightquest" portion of the ''ComicBook/{{Knightfall}}'' storyline was this. After being doused with the Scarecrow's Fear Gas, the hypnotic trance known as The System kicked in, haunting Jean-Paul with images of his father and of Saint Dumas, the "creator" of the order he once was part of. As he's haunted by these apparitions, The System drives him to be more brutal and continuously modify the Bat-Costume, the pinnacle being when he allowed Abbatoir Abattoir to die, condemning his captive to death, modifying the Bat-Costume to the point where it was less Batman and more Azrael and outright kicking [[Comicbook/RobinSeries Robin]] out of the Batcave and working against him, alienating Commissioner Gordon, and ''Bruce Wayne'' and deciding that all criminals need to be put out of their misery. It's at that point that Bruce decides enough is enough and sets out to take back the Mantle of the Bat.



* ''Fanfic/LePapillonRising'' takes Adrien Agreste from Miraculous Ladybug, and slowly twists him into a psychotic, obsessive, slightly socipathic {{Yandere}} through use of the Butterfly Miraculous. It's worth noting that this is an AU where Adrien is the main villain.

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* ''Fanfic/LePapillonRising'' takes Adrien Agreste from Miraculous Ladybug, and slowly twists him into a psychotic, obsessive, slightly socipathic sociopathic {{Yandere}} through use of the Butterfly Miraculous. It's worth noting that this is an AU where Adrien is the main villain.



* ''Radio/BleakExpectations'': A few days on a dessert [[note]]No, it's an island [[ExactlyWhatItSaysOnTheTin made out of dessert]][[/note]] island drive Pip Bin utterly mad, to the extent that he loses track of time, and considers eating himself, only relenting when he realises this is "probably a bit of an own goal". He quickly recovers when he finds someone to boss around.

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* ''Radio/BleakExpectations'': A few days on a dessert [[note]]No, [[note]]Not a typo, it's an island [[ExactlyWhatItSaysOnTheTin made out of dessert]][[/note]] island drive Pip Bin utterly mad, to the extent that he loses track of time, and considers eating himself, only relenting when he realises this is "probably a bit of an own goal". He quickly recovers when he finds someone to boss around.



* Blanche in ''Theatre/AStreetcarNamedDesire'' as well as the film adaption with Creator/VivienLeigh.

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* Blanche in ''Theatre/AStreetcarNamedDesire'' as well as the film adaption adaptation with Creator/VivienLeigh.


One way to demonstrate this process is MundaneHorror: when some weird and unsettling details appear in everyday life, this may be the first sign that a character is losing his grasp on reality.

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One A common way to demonstrate this process is MundaneHorror: when some weird and unsettling details appear in everyday life, this may be the first sign that a character is losing his grasp on reality.

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One way to demonstrate this process is MundaneHorror: when some weird and unsettling details appear in everyday life, this may be the first sign that a character is losing his grasp on reality.

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* Music/{{Queen}} has "I'm Going Slightly Mad" and, with less focus on slippage and more on the crazy, "Stone Cold Crazy."

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* In ''Webcomic/GirlGenius'' Gil's father [[spoiler:overlaying his own personality over a portion of Gil's mind]] and his [[spoiler:inheriting the responsibility of ruling his father's quickly crumbling empire]], combined with losing nearly every single friend and family member he had all at once, has not been kind to him and he's implied to have been in TheMadnessPlace for ''two and a half years''. All of Europe can tell there's something off with him.

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* Twilight and Pinkie Pie go though this in ''FanFic/BrideOfDiscord'', after Discord takes Fluttershy away, do to both losing a friend and in Twilight's case, working herself to the bone and refusing to rest, while trying to find any possible way of getting her back.

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* ''FanFic/ThisBites'': During the Enies Lobby arc, Sengoku combines this with UnstoppableRage. Every piece of bad news that comes his way drives him closer and closer to the edge, and by the time he's finally on his way to the Judicial Island himself, he's basically in full-out VillainousBreakdown mode.

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* In the ''ComicBook/BatmanVampire'' trilogy, although Batman is a straightforward hero in the first book, by the second book in the series he begins to lose his mind as he becomes increasingly tempted by his new need for human blood, culminating in the former hero ranting about how he will drain the blood of his old friend James Gordon if Gordon won't kill him.


Compare GoMadFromTheRevelation, FreakOut, VillainousBreakdown, RoomFullOfCrazy, MadnessMantra, LaughingMad, and WithGreatPowerComesGreatInsanity. If this is a backstory it's PreInsanityReveal.

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Compare GoMadFromTheRevelation, FreakOut, VillainousBreakdown, RoomFullOfCrazy, MadnessMantra, LaughingMad, and WithGreatPowerComesGreatInsanity. If this is a backstory it's PreInsanityReveal.
PreInsanityReveal. Compare SlowlySlippingIntoEvil.


* In the ''VideoGame/UnderTale'' fanfic ''FanWork/AlphysHoek'', this gradually happens to Alphys over the course of each chapter, partially as a result of [[AndIMustScream having to deal with the game's fanbase 24/7]] and also partially as a result of the unspeakably humiliating things that Mettaton forces her to do on public TV where everyone in America can see her; by the end of the story, she's a literal genderbent [[TheRenAndStimpyShow Ren Höek]] who's completely hell-bent on [[BadassAdorable twisting Mettaton's neck in his sleep.]]

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* In the ''VideoGame/UnderTale'' ''VideoGame/{{Undertale}}'' fanfic ''FanWork/AlphysHoek'', this gradually happens to Alphys over the course of each chapter, partially as a result of [[AndIMustScream having to deal with the game's fanbase 24/7]] and also partially as a result of the unspeakably humiliating things that Mettaton forces her to do on public TV where everyone in America can see her; by the end of the story, she's a literal genderbent [[TheRenAndStimpyShow Ren Höek]] who's completely hell-bent on [[BadassAdorable twisting Mettaton's neck in his sleep.]]

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* Teddy of ''ComicBook/{{Plutona}}'' slides from hero-worshipping the capes to wanting to become one to pursuing some pretty icky attempts to fulfill that dream.

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** The whole album is about the main character, Crybaby, going through experiences making her more insane. "Mad Hatter", the last song of the album, clearly set up that Crybaby is now fully embracing her madness.

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* [[WasOnceAMan Reaper]] was already AxCrazy in [[VideoGame/{{Overwatch}} Overwatch]] canon. In ''[[FanFic/BreakMyHeartBreakYourHeart Break My Heart, Break Your Heart]]'', he gets worse. [[UpToEleven Way, way worse.]]

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* ''ComicBook/RedSonja'': ''Queen of Plagues'' first shows Dark Annisia as a slave alongside Sonja, then as a high skilled military commander. As the plague's true nature is revealed she goes from WellIntentionedExtremist down to bloodthirsty and indiscriminate murderer.

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* Wrestling/RandyOrton infamously started to lose it after his first world title run, which involved his friend and mentor, Wrestling/TripleH, ousting him ([[NoHoldsBarredBeatdown forcefully]]) from Wrestling/{{Evolution}} in a fit of jealousy. Cracks began to show in The Legend Killer's suave persona over the next few years, and a Wrestlemania feud with (and loss to) Wrestling/TheUndertaker shoved him over the deep end.

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