History TookALevelInJerkass / AnimeAndManga

* ''Anime/DragonBallZ'': This happens to [[{{Badass}} Vegeta]] [[spoiler: after his FaceHeelTurn]].

** Chichi's MamaBear tendencies make her do this at the end of the Saiyan saga, where she declares the world can be destroyed for all she cares and refuses to show Goku any sympathy after he's outright crippled as she blames him for getting Gohan involved. She tones down by the Android and Majin sagas.

* ''GundamAge'', Flit Asuno goes from an idealistic shonen hero to a ruthless dictator who is willing to destroy his enemy [[FantasticRacism "race"]] without listening to anyone even his son and grandson. To say that he has taken a level in jerkass is an understatement.

* ''Anime/Persona4TheAnimation'' has Chie, Yukiko, Rise, and Naoto in episode 20 when the Investigation Team are staying in the Amagi Inn due to them are still in the hot springs when it's the boy's turn and [[NeverMyFault refusing to apologize to them for the moment, even if it's their own doing]]. And worst of all, [[KarmaHoudini they get away with it!]]

* It's stated evolution changes a ''Anime/{{Pokemon}}'''s personality in the anime and this is most noticeable with Charizard. As a Charmander he was overall a nice Pokemon, maybe even one of the [[NiceGuy nicest]] Ash owned in the Original Series, but when he evolved into a Charmeleon he TookALevelInJerkass. He stopped listening to Ash and was more violent, and it didn't get any better when he evolved again. With gradual character development by his reappearance in Unova he was as kind as he was as a Charmander.

** Chichi's MamaBear tendencies make her do this at the end of the Saiyan saga, where she declares the world can be destroyed for all she cares and refuses to show Goku any sympathy after he's outright crippled after she blames him for getting Gohan involved. She tones down by the Android and Majin sagas.

* Chiba and Maho from ''Manga/WanderingSon'' have taken this in recent chapters. In Maho's case, it might be because she hit puberty.
** To specify, Saori went through a sort of TraumaCongaLine in late elementary. She was becoming increasingly jealous of Takatsuki's friendship with Nitori which lead her relationship with everyone to sour. Eventually she became bitter and aggressive. Maho on the other hand was under stress of having her crush fall in love with her little brother, along with said sibling being transgender.

* Suzaku from ''Anime/CodeGeass'' gets a ''huge'' one during the timeskip, [[BreakTheCutie for obvious and rather justified reasons]]. He never really gets better, and his pain is very apparent, if expressed in the wrong way.

* Depending on your opinion, this is what happens to anyone who is infected with Eclipse in ''Manga/MagicalRecordLyricalNanohaForce''.

* "[[KuroganeNoLinebarrel Linebarrels of Iron]]" The main character so incredibly straight until even the helpful support character hates him.

* "Linebarrels of Iron" The main character so incredibly straight until even the helpful support character hates him.

* Most of the former NERV officers after the TimeSkip in the third ''RebuildOfEvangelion'', especially Ritsuko. MAJORLY justified though since the reason everyone is now so hostile towards Shinji is because [[spoiler: he almost destroyed the world]].

*** [[NiceGuy Iruka]] of all people takes one in The Sixth movie. Set after a battle with Akatsuki, some of the Konona 11's parents are offering to recommend to Tsunade that they get promoted to Jonins for their efforts. Naruto seeing this goes to him as he's the closest thing Naruto has to a family and asks if he could do the same. Iruka coldly shoots him down and tells him he won't get special treatment just cause he saved the Village from Pein not even offering to let him get promoted to Chunin. Geez Iruka and I thought you loved Naruto like a brother

* ''Manga/DragonBall'': This happens to [[{{Badass}} Vegeta]] [[spoiler: after his FaceHeelTurn]].

*** When Tobi told Sasuke the AwfulTruth, Sasuke went from sparing the lives of insane prisoners to casually murdering guards doing their jobs, not to mention [[spoiler:almost killing Karin because she was captured by the freaking ''Hokage'']].

*** When Sasuke recovered from [[MindRape Tsukiyomi]], he lashed out at Konoha in general for his being weaker than Itachi and Naruto in specific for his success in getting stronger. This led to him defecting and almost killing Naruto.

* ''GundamAge'' Flit Asuno goes from am idealistic shonen hero to a ruthless dictator who is willing to destroy his enemy [[FantasticRacism "race"]] without listening to anyone even his son and grandson. To say that he's taken a level in jerkass is an understatement.

* Chiaki Yoshino from ''Manga/SekaiichiHatsukoi'' went from [[InnocentlyInsensitive bratty but well meaning]] {{adult child}} to immature {{jerkass}}. This might be justified as he's dating his best friend Hatori who is a {{Yandere}} and given that [[spoiler: he was [[RapeasDrama brutally raped]] and then suddenly forced the two into a relationship based on [[LivingEmotionalCrutch co-dependency]]]] pretty much made him worse as shown when his relationship with his best friend [[UnluckyChildhoodFriend Yanase]] is strained given that he fails to understand Yanase's feelings and not only turns him down multiple times in the worse way possible but constantly rubs salt on the wound. It gets to the point that Yanase does call him out on his attitude...unfortunately, it means nothing in the next episode where Chiaki pulls a huge {{jerkass}} moment that the fanbase [[NeverLiveitDown won't let him live down]] and generally through him into TheScrappy territory.