History Flanderization / AnimeAndManga

* This happened to both the leads from ''Manga/KaguyaSamaLoveIsWar'' after the series changed its format from self-contained battles of wits to an EnsembleCast-based show with greater focus on {{Story Arc}}s:
** Shirogane was originally introduced as TheAce: a hyper-intelligent, handsome, and talented {{Chessmaster}} [[RagsToRiches who managed to be the first commoner to ascend Shuchiin Academy's class-based hierarchy in decades]]. The chapter where he was revealed to be bad at sports was originally just a way to show that he wasn't as perfect as he first appeared, but the series takes this trait and runs with it to the point where [[GiftedlyBad he ends up becoming completely incompetent at anything that isn't intellectual in nature]].
** Kaguya was introduced as the heiress to Japan's richest family and a ChildProdigy who was Shirogane's equal in talents and intellect if not more so. Nonetheless, she was still pretty sheltered and could get flustered when things took an overtly romantic tune. As she came to terms with her crush on Shirogane more and more, she went from someone who battled intellectually against him to someone who couldn't say two words to him without blushing crimson.

** With the villainous [[ColonelKilgore Vegeta]], this set in already in the original manga. Early on, he was portrayed as a pragmatic and [[NoNonsenseNemesis ruthlessly efficient]] SociopathicSoldier, in deliberate ''contrast'' to the several purely [[ForTheEvulz randomly evil]] bad guys who preceded him (and, as it turned out, followed him), who was not above EnemyMine or even [[VillainExitStageLeft unceremoniously running away]] when the fight turned against him. However, at ''one'' point he did indulge in a bit of sadistic taunting by letting a group of inferior minions fight a team of [[SuperWeight hopelessly outclassed]] heroes who were no threat at all to him for his amusement--nevermind that he quickly dropped this charade and got deadly serious when some heroes appeared who ''were'' a genuine potential threat. His later appearances drew increasingly exclusively on that single sequence for his characterization, however, making him an [[HonorBeforeReason honor-obsessed]] BloodKnight who would do things like ''help his enemies grow stronger'' so he'd get to [[TooDumbToLive fight the most formidable opponent of all]].

* ''Manga/{{Beastars}}'': [[TheHero Legosi]] gets this of the sexuality variety. While far more subtle and less intrusive than most examples of this trope, [[FridgeLogic it can still retroactively ruin the entire story if you think about it too hard]]. Legosi is introduced someone whose nature compels him to be assertive, courageous, and a tad domineering. However, he lives in a society that views such traits as wholly negative and so forces himself to be meek to fit in. Louis and Haru both saw right through his facade and treated him accordingly, which caused him to fall in love with Haru and come to view Louis as his moral compass. He's also a little bit more ''preoccupied'' with herbivores than is normal for a 17-year old Wolf, and multiple characters have noted that it reaches the level of fetishizing them. However, towards the latter third of the series this fetish starts to reach a point where his motivation for doing anything can be traced back to it, to the point where his bond with Louis and Haru were now born of his fetish first and that they were the first people his own age to treat him like a real person second. In the case of Haru, it's especially creepy since he has romantic feelings for her which wouldn't be a thing if she weren't a rabbit.

** Broly [[Anime/BrolyTheLegendarySuperSaiyan in his first movie]] wasn't what you'd call a particularly talkative or emotive character; he was introduced as a quiet and meek Saiyan who seemed content to let more dominating personalities like Vegeta boss him around. Midway through the movie came TheReveal that he was an actually an AxCrazy [[TheBerserker berserker warrior]] whose insanity was being suppressed by his father and that he hated Goku because [[NoInfantileAmnesia Goku's nonstop crying frightened him the day he was born]]. But even in his maniacal Legendary Super Saiyan state he has dialogue, a handful of [[BadassBoast Badass Boasts]] and enough brainpower to anticipate his father's DirtyCoward escape and beat him to the punch. In his sequel appearance, and most of his appearances in games and specials thereafter, his insanity and his obsession with Goku have become his sole character traits, to the point that his dialogue now primarily consists of [[SayMyName screaming Goku's name]]. It's become fairly common fanon that his signature SuperMode is degrading his mind, a compelling argument in light of the fact that he rarely ever appears ''outside'' of that form.

** Ino Yamanaka at first started out as a ninja who focused more on her appearance and love than actual fighting. However, she still isn't above giving up those 2 to win (as evident by cutting her hair short to outsmart Sakura). She is also known to have the highest grades out of the Konoha 11. However, when the anime fillers kicks in, she was turned into a character who only cared about her appearance, where she freaks out when a prince chooses another girl over her, and the majority of the Shippuden's Extra footage containing her is about her complaining about or glorifying her bust size.

** Ami is a more subtle case, ''Sailor Moon R'' felt the need to give it a bump to the point where she can't seem to go most episodes without mentioning the need to study. Though given the fact that the girls are studying to pass their high school entrance exams, this can be somewhat understood.

** Zelgadis did not change much initially, save for becoming [[DeadpanSnarker snarky]], but as time passed, he became more of a whiner and, despite, well, whining about his chimeric body so much, he takes joy in InsultBackfire that occasionally happens to him, tends to dismiss his companions (especially when they're trying to be actually nice to him), and in later manga and newer anime seasons, shows signs of being an InsufferableGenius. In the original books, he's a genuinely sad figure that simply wants to [[IJustWantToBeNormal be normal again]] and [[TheAtoner atone]] for working under Rezo, the Red Priest.

* In the first series of ''Manga/ToLoveRu'', Rito perverted accidents were more often caused by Lala's inventions, rather than Rito's own clumsiness. In the sequel "Darkness", he can hardly take a step without tripping onto a girl in a suggestive position. As a result, this has become his principal hallmark.

** This happened not just with characters but PlotDevice as well. Initially the pun-based reactions were PlayedForLaughs ImagineSpot. From middle to late series, it got exaggerated into a straight up superpower that the main characters save the world with.