History UsedToBeASweetKid / AnimeAndManga

** Naoka Ueno is a particularly tragic example. [[spoiler: As a young and genuinely sweet girl in elementary school she nursed an unrequited but innocent crush on the protagonist Shoya Ishida, and wanting to please him badly she started to model her behaviour on his own. Unfortunately Shoya was a [[TheBully bullying troublemaker]] so Ueno became a brat herself and joined in on Shoya's [[BullyingTheDisabled torment of deaf]] girl Shouko Nishimiya. Worse still she soon discovered Shouko had a crush on Shoya as well and stricken with [[ClingyJealousGirl jealous hatred]] she upped her bullying of Shouko and [[UsefulNotes/VictimBlaming blamed her]] when their class eventually used Shoya as a scapegoat when Shouko's mother complained. In the present Ueno is an obnoxious AlphaBitch who still can't stand Shouko and despairing at a [[TheAtoner reformed]] Shoya now [[DisabledLoveInterest reciprocating]] Shouko's feelings, does her best to come between them acting like a {{Yandere}} in the process.]]

* The main character Jae Hyuk of the manwha ''Manhwa/ImmortalRegis'' started out as a sweet OrdinaryHighSchoolStudent devoted to caring for his DelicateAndSickly little brother. Then both of them got dragged into another dimension full of swords and sorcery and monsters. Jae Hyuk is forced into the role of TheHero while his little brother [[spoiler:eventually becomes the host of the BigBad]]. Over the course of the series, Jae Hyuk becomes more and more jaded and bitter about having his old life ripped away from him (being turned into an undead abomination didn't help either). In the sequel series ''Cavalier of the Abyss'' which takes place years later, Jae Hyuk has become the new king of the other world. The first thing we see him do is ruthlessly order ThePurge of a village of suspected rebels -- men, women, and children alike are all put to the sword. He also chops off the arm of a soldier who questioned his orders. He's not so sweet anymore.

* ''Manga/FruitsBasket'' has Kyo Sohma. Kagura's flashbacks shows that Kyo, even with the stigma of being the Cat of the Sohma family, was a timid but well-meaning child who was eager to spend time with her because he'd never had friends before. It wasn't until his mother was DrivenToSuicide and ''every single adult in his famiy'', save for his foster father Kazuma, [[TheyDiedBecauseOfYou blamed him for her death]], that he develops the hot-headed, rude, temperamental and violent personality he has in the present day.

* The first line in the ''LightNovel/{{Baccano}}'' novel set in 1705 is from [[ManipulativeBastard Huey Laforet's]] mother, talking about how innocent he was. [[{{Immortality}} A couple of hundred years]] since, he's become a MadScientist who sees all humans ([[AbusiveParents including his own children]]) as "raw materials."

* Tabitha [[spoiler:aka Princess Charlotte]] of ''LightNovel/TheFamiliarOfZero''. Before her [[spoiler:mother went mad to save her from an assassination attempt from her EvilUncle]], Tabitha was a CheerfulChild. Now she's TheStoic and very quiet.

* In ''LightNovel/FullMetalPanic'', one side story focusing on Sousuke and Kalinin's backstory showed that Sousuke was this. During his childhood, when he was rescued by Kalinin and they spent time together, Kalinin was shown to love Sousuke and grow so attached to "that sweet and gentle boy" to the point where he really wanted to adopt him as his own. Then they got separated, and the next time they meet, they met as enemies, with Sousuke becoming the StrawNihilist [[TheStoic Stoic]] that we know today.

* ''Anime/YuGiOhGX'''s Kaiser Ryo. As shown in a flashback, he ''used'' to be a sweet, idealistic kid. Somewhere along the line, he became the [[TheStoic stoic]], cold, AloofBigBrother of Season 1. It's even more jarring after he [[FreakOut freaks out]] and becomes [[BloodKnight Hell]] [[BrokenAce Kaiser]].

** Sofia Irininskaya Pavlovena, a.k.a. Balalaika, [[https://www.youtube.com/watch?v=agWy-7XANJ8 used to be]] a pretty, young and seemingly friendly girl who wore her hair in GirlishPigtails and whose dream was to do her family proud in the Olympics as a sharpshooter. That is... until the [[WarIsHell Afghanistan War]].

** Naoka Ueno from is a particularly tragic example. [[spoiler: As a young and genuinely sweet girl in elementary school she nursed an unrequited but innocent crush on the protagonist Shoya Ishida, and wanting to please him badly she started to model her behaviour on his own. Unfortunately Shoya was a [[TheBully bullying troublemaker]] so Ueno became a brat herself and joined in on Shoya’s [[BullyingTheDisabled torment of deaf]] girl Shouko Nishimiya. Worse still she soon discovered Shouko had a crush on Shoya as well and stricken with [[ClingyJealousGirl jealous hatred]] she upped her bullying of Shouko and [[UsefulNotes/VictimBlaming blamed her]] when their class eventually used Shoya as a scapegoat when Shouko‘s mother complained. In the present Ueno is an obnoxious AlphaBitch who still can’t stand Shouko and despairing at a [[TheAtoner reformed]] Shoya now [[DisabledLoveInterest reciprocating]] Shouko’s feelings, does her best to come between them acting like a {{Yandere}} in the process.]]

* [[spoiler:Faye Valentine]] of ''Anime/CowboyBebop'' actually used to be a very sweet idealistic child from what could be told from the lost tape found from a time capsule. It is a very [[TearJerker sad]] comparison to how they are as an adult.

** The [[Anime/FullmetalAlchemist 2003 anime]] version of Wrath is introduced as a young WildChild before being revealed to be a homunculus. Envy feeds him red stones which makes him undergo a FaceHeelTurn into a full EnfantTerrible. In the end, he's mellowed down but is solemn and depressed, especially after [[spoiler:the death of his mother Izumi, who he had finally accepted as his mother]].

* ''LightNovel/AccelWorld'' has [[CreepyChild Nomi]], a.k.a Dusk Taker. [[spoiler:In the last two episodes of the anime, it's revealed that his mentor, who introduced him to Brain Burst, used and abused him to the point of breaking. When he's defeated, and the Brain Burst (and his memories of it) erased, he reverts back to being a cute boy.]]

** Mao was a sweet, innocent little boy until [[spoiler:C.C. gave him his Geass power]]. After [[spoiler:she abandoned him in the hope of making him not rely on her]] it ultimately [[BreakTheCutie broke him completely]] and [[UnhappyMedium drove him insane]], so he turned into a PsychopathicManchild with no grip on reality who {{Mind Rape}}s the local AllLovingHero and the KnightInShiningArmor and kidnaps the IllGirl... To say that his opponent, the IllGirl's DarkMessiah, was ''pissed off'' at him, is an understatement.

* The main character Jae Hyuk of the manwha ''Manhwa/ImmortalRegis'' started out as a sweet OrdinaryHighSchoolStudent devoted to caring for his [[IllGirl Ill Boy]] little brother. Then both of them got dragged into another dimension full of swords and sorcery and monsters. Jae Hyuk is forced into the role of TheHero while his little brother [[spoiler:eventually becomes the host of the BigBad]]. Over the course of the series, Jae Hyuk becomes more and more jaded and bitter about having his old life ripped away from him (being turned into an undead abomination didn't help either). In the sequel series ''Cavalier of the Abyss'' which takes place years later, Jae Hyuk has become the new king of the other world. The first thing we see him do is ruthlessly order ThePurge of a village of suspected rebels -- men, women, and children alike are all put to the sword. He also chops off the arm of a soldier who questioned his orders. He's not so sweet anymore.

* [[spoiler:Sakuya Ookuchi]] from ''Manga/SensualPhrase'' once was a kind boy who lived alone with his BrokenBird mother. We meet him, however, as [[spoiler:a massively screwed-up BastardBoyfriend]].