History VillainFixing / AnimeAndManga

** A major one during the Marley Arc. For the last century, Marley had constantly been sending the Eldian dissidents to Paradis; transforming them into Pure Titans. Because of this; Humanity within the Walls had invented ODM Gear and adapted their fighting strategy for dealing with the Titans outside of The Walls, and during the attack orchestrated by Marleys' Warriors years prior. Adding in the advancements introduced like the Thunder Spears and Marleys' overreliance on sending in Titans and Titan-Shifters to fight their battles turn into one of their greatest hindrances [[https://www.youtube.com/watch?v=OmDLtFxORRk as was shown with Porco becoming overwhelmed by veterans of The Scout Regiment: who have honed their skills to specifically fight against Titans]].

** But bigger and longer in the making than all of the above would have to be the series' BigBad, who caused his own downfall by one act of kindness. The Dwarf in the Flask (AKA: Father) saved Hohenheim from becoming a human sacrifice along with the rest of Xerxes ''and'' split the resulting Philosopher's Stone with him, which extended Hohenheim's lifespan well beyond its natural end (both as thanks for being the reason he existed, as Hohenheim's blood was used by an alchemist to create Dwarf in the Flask). Without that, Hohenheim never would have lived to have the opportunity to set up the giant reverse transmutation circle that gave the heroes the chance they needed to fight back in the end. Not to mention fathering Al and, more to the point, [[TheHero Ed]], who ultimately foil the BigBad's plot.

* In ''Anime/MaiHime'', the Obsidian Prince goes to great lengths to make sure Mai wins the Festival. He also has Mikoto in reserve in case Mai won't join him. But for that to work, he needs Mikoto to be willing to kill her--and he himself had just finished convincing Mikoto that Mai would still forgive her! (This was part of the plan to eliminate another [=HiME=].) She might still have done it if Mai had been really out for blood, but the prince should've known her better than that.

%% This page has been alphabetized. Please add new examples in the correct alphabetical order.

** Eren points out the greatest mistake of Annie, Reiner and Bertolt was teaching him how to ''fight''- Reiner served as a mentor to Eren and the other cadets, while Annie sparred with him and taught him hand-to-hand combat. While hand-to-hand combat skills are of limited use when fighting a Titan, it's another story for Eren. Since he can transform into a Titan, martial arts skill is useful against the hordes of other titans and especially useful against enemy Titan Shifters like the aforementioned trio.

* In episode 4 of ''Manga/ChargerGirl'', a thief breaks into the school where Hakone and Iono attend. He steals both the student council's funds, along with Iono's gift to Sento, Hakone's brother. Plug and Sento decide to help Iono out of her depression by trying to find the thief, but have no luck whatsoever. Arresta, a coworker/rival of Plug, meanwhile watches them a little bit, then decides that while its noble of him to help her out, she's got a job to do. She decides to continue her job of [[ItMakesSenseInContext zapping people]], and one of the people she zaps suddenly decides he's going to turn himself in. Although she's wondering what the heck she just did, she inadvertently caught the thief and helped recovered the stolen money and Iono's gift.

** During the Impel Down Arc, Luffy's first confrontation with Magellan in Level Four of the complex is a CurbStompBattle with Luffy on the curb, with the result being Luffy poisoned with Hydra, a venom that kills in 24 hours. Magellan then tells the other guards to send him to Level Five, despite the fact that he'll die anyway. Unfortunately for Magellan, Luffy is eventually found there by Ivankov and the other members of the Newkama Land colony (which not even the guards know about) and Ivankov is able to use his Horu Horu no Mi Devil Fruit power to aid Luffy in fighting off the poison, which he eventually does. As a result, Magellan soon has a crisis on his hands as Luffy's trek through Impel Down continues with even more gusto. (Of course, one can hardly blame Magellan, as ''nobody'' had ''ever'' survived the Hydra. Even Ivankov said that his help would only raise Luffy's nonexistent chance of surviving to about 5%.)
** Magellan poisoning Luffy has more repercussions than that. [[PoisonousPerson Magellan’s]] poison’s potency can be adjusted and when he engulfed Luffy in his poisonous cocktail, Luffy’s body got exposed to toxins of all kinds of degrees. Now normally this would have meant certain death for him. But thanks Ivankov, he survived, and in the process his body was able to live long enough to produce absurdly strong antibodies to combat poison. By poisoning Luffy so severely, Magellan has inadvertently given Luffy the ability to [[NoSell shrug off]] most types of poison, as demonstrated when he was fighting Caeser. The mad clown tries to kill him by enveloping him a giant cloud of DeadlyGas, and Luffy simply breathes it all in at once [[TheWorfBarrage without any issues]]. Subverted, Luffy isn't completely immune to poisons, as one being extremely fatal is able to injure him seriously, meaning Magellan is still a credible threat to Luffy.
** Caesar Clown does this after Luffy hands him his ass, by trying to stab Smoker's heart (which was extracted courtesy of Tralfager Law) in order to [[TakingYouWithMe take him out too]]. Thing is, Law had tricked him, and what he ''actually'' held was his subordinate Monet's heart. He chose to stab it at exactly the moment that Monet was going to use a self-destruct mechanism to kill everyone on the island, thus ''saving'' Smoker along with the rest of his enemies.
** Doflamingo's seemingly fool-proof plan to prevent Luffy enacting his SpannerInTheWorks tendencies results in this. His plot involved a tournament for Ace's devil fruit, in order to distract Luffy from destroying the [=SMILEs=] factory. Sure enough, Luffy enters, and finds himself in a pickle when he can't leave the tournament without being noticed and allowing the devil fruit to fall into Burgess's hands due to being in the finals, until ''Sabo'' arrives (apparently as a Revolutionary) and trades places with him. The thing is, Sabo's appearance is largely Doflamingo's own fault. Chances are the Revolutionary Army would have never taken action on Dressrosa and Sabo would have never appeared had it not been for the tournament for the Mera Mera no Mi. What proceeds afterwards is a domino effect that complete derails his plans, to the point that, in hindsight, setting up the tournament was the first step towards his downfall.
** The tournament becomes Doflamingo's worst plan in another way--the rest of the fighters, once they've lost their matches, are turned into LivingToys and made slaves of the Don Quixote Family. Once Usopp stops the curse and everyone goes back to normal, these same fighters are now ''royally PO'd'' at Doflamingo and bound and determined to wipe him out. In the ensuing battle, several of the Don Quixote Family's officers are taken down by these champions. It's stated that Doflamingo's actions have united an otherwise random assortment of champions, rogues and weirdos into an ArmyOfThievesAndWhores. Even worse, these people (totaling over 5,000) ultimately unite ''behind Luffy''. Thanks to his meddling, Doflamingo has just created ''the biggest pirate alliance since the legendary Whitebeard''. This is bound to have repercussions long after his defeat.

** A minor one was when Baby 5 was believing that Sai was proposing to her, her ally Lao G was telling his opponents that she was only a [[ExtremeDoormat "convenient"]] underling. Along with Sai promising to [[LoveRedeems marry her]], [[HighHeelFaceTurn Baby 5]] [[HeelFaceTurn defected from the Don Quixote Family]] and joined the Happo Navy that becomes part of the Straw Hat Grand Fleet.
** During Whole Cake Island, the Charlotte siblings, the main body of the Big Mom Pirates, end up making things easier for the Straw Hats and harder for themselves. First, [[spoiler: Pudding]] gloats about their plans to kill the Vinsmokes and take their technology...unaware that Sanji, the WhiteSheep of the family, is listening. Meanwhile, Opera, who was supposed to have killed Luffy and Nami in the prison, ends up losing his prisoners to Jimbei, and lies about what happened to avoid a YouHaveFailedMe death. Smoothie, hearing that there's ''some'' kind of ruckus in the prison, has the entire level sealed off to keep Big Mom from finding out and upsetting her. This allows the Straw Hats to plan their own counter to Big Mom's plans. When they begin, part of it involves having dozens of animals transformed into Luffy by a captured Devil Fruit user as part of a distraction. Katakuri, who has epic CombatClairvoyance, tells everyone to focus on the real Luffy… and completely misses Brook, wearing a PaperThinDisguise, who manages to complete the first step of the counterattack.
** This becomes a habit for the Charlottes throughout the course of the Whole Cake Island arc after the tea party is foiled. Of particular note is Brulee, [[spoiler:who announces Katakuri's defeat at Luffy's hands to the forces of Cacao Island while Luffy and Sanji are trying to flee to Sunny. While it succeeds in getting them to focus more on Luffy, it causes them to open themselves up to attacks from the Vinsmokes, who run roughshod over them, allowing their brother and his captain to escape]].
** In Wano, the heroes are trying to raise an army from the citizens for a raid on Kaido's hideout. However, since they have to be undercover, the alliance has to be very circumspect about it, only identifying possible allies by a tattoo on their ankles. Luffy is imprisoned in a labor camp early on, and later learns that most of the workers were captured for rebelling against Kaido- thus, when he takes over the camp, the alliance suddenly has at least 4,000 samurai to join on their raid! Meanwhile, Kaido's forces get wind of the tattoos and begin imprisoning everyone sporting them. But, as Sanji notes, this means that all of their possible recruits have been gathered in one place, adding another thousand to their ranks!

* ''Anime/PrettySammy''[=/=]''Magical Project S'': In episode 19, Ramia has transformed Misao into Misa in the day where her father comes to visit her. Her plan not only fails, but also leads Sasami and Misao to have angst of discovering their magical girl identities.
* [[ManipulativeBastard Kyubey]] in ''Anime/PuellaMagiMadokaMagica'' pushes Madoka to make a contract with him, and make a wish, because he knows she will make an extremely powerful magical girl, and, in turn, the most powerful witch in existence, Klimheld Gretchen. In the process of trying to break her, he reveals the existence of magical girls throughout humanity's history, and that they all died in despair. When she finally agrees to the contract, her awareness of the suffering that has happened in the past drives her to force through a CosmicRetcon--which Kyubey has no choice but to grant. On top of that, the only reason she's so powerful in the first place is because he granted Homura's wish to save Madoka in such a fashion as to send Homura off on her quest through alternate universes, each of which adds a bit more to Madoka's power...

** The equivalent moment in the manga for Kid fits the trope--Mosquito Curb Stomping him triggers his [[DeadlyUpgrade questionable]] Super Mode, but Black Star's final fight with Mifune does not. Black Star had already been 'fixed' by his negotiation with [[DarkIsNotEvil Nakatsukasa/Masamune]] and the Single Stroke Battle sequence which ends his fight specifically, IIRC, does not involve an SuperMode.

* In episode 4 of ''Manga/FightIppatsuJuudenChan'', a thief breaks into the school where Hakone and Iono attend. He steals both the student council's funds, along with Iono's gift to Sento, Hakone's brother. Plug and Sento decide to help Iono out of her depression by trying to find the thief, but have no luck whatsoever. Arresta, a coworker/rival of Plug, meanwhile watches them a little bit, then decides that while its noble of him to help her out, she's got a job to do. She decides to continue her job of [[ItMakesSenseInContext zapping people]], and one of the people she zaps suddenly decides he's going to turn himself in. Although she's wondering what the heck she just did, she inadvertently caught the thief and helped recovered the stolen money and Iono's gift.

** Inuyasha and Miroku were trapped in a cocoon by the moth demon, Gatenmaru and forced to watch as the latter eats the women of the village he and his men destroyed. This forced Inuyasha's [[SuperpowerEvilSide]] to take over and kill the demon and [[AssholeVictim most of his men]]. When Kagome helped restore Inuyasha's sanity, the event also made Inuyasha think about not wanting to be a full demon.

* Played pretty much straight with Gauron from ''LightNovel/FullMetalPanic'', of all people. Despite all that he's done and/or tried to do to Sousuke, his words end up have an eventually positive impact on the kid. For example, his lecture in TSR contains not only vital information that he willingly passes on to Sousuke (in order to get revenge on his former organisation, but mostly "as a favour to you"), but it also poses Sousuke one of the most important questions in his personal arc: "Did you sell your soul to those bastards in Mithril?" Sousuke gives his answer during his confrontation with his Mithril superiors at the end of TSR: "I dont' remember selling my soul to you." Also, on every occasion after Gauron's death (uh... the final, ''definitive'' one, I mean...), that someone mentions Gauron, it only serves in making Sousuke try harder. He uses his 'Kashim' personality to reach his goals, knows some of his enemies better because they were Gauron's associates (and they fear/respect him because they know how Gauron... ''felt'' about him) and he eventually confirms his and Gauron's almost identical nature to Leonard Testarossa's face, with no shame or guilt, merely pointing out the one thing that made them different: the enjoyment they each took in the act of killing (or lack thereof, in Sousuke's case). And in hearing Leonard's words about Gauron's opinion on the delicate subject of changing history/fate, Sousuke received confirmation of his own beliefs (apparently, he trusted Gauron's judgement on this matter, at least). All in all,not a bad job from the resident psychopath of the series.

* ''Anime/Danganronpa3TheEndOfHopeSPeakHighSchool'':

* ''Anime/DanganRonpa3'': Generally in this franchise, if Junko's plans fail, it's because [[FairPlayVillain she deliberately left a loophole for them to fail]]. However, in one of them, there was one thing she didn't think to factor in: what executing Izuru's MoralityPet Chiaki would do to him. While it certainly did push Chiaki's classmates into despair and bring them under her sway, it pushed Izuru ''out'' of despair simply through sheer anger, and thus out of her service. Because of this, he would go on to mastermind the events of [[VisualNovel/SuperDanganRonpa2 the second game]], leading directly to her downfall there and the salvation of not only Chiaki's friends, but the Future Foundation as well.

* In ''Manga/AttackOnTitan'', Eren points out the greatest mistake of Annie, Reiner and Bertolt was teaching him how to ''fight''.
** Had Annie/the Female Titan not spared Armin's life as the former was slaughtering soldiers, he would have not figured out her identity.

* In ''Anime/SonicX'''s third series the Metarex kidnap Sonic's friends in order to blackmail him into revealing all his abilities to them. Given that Sonic was on a [[WithGreatPowerComesGreatInsanity superpowered crazy kick]] thanks to Dark Chaos Emeralds littering the building at the time, this turned out to be an [[BerserkButton even worse idea for them than threatening Sonic's friends usually is]]. Whether the good guys or the bad guys won, [[PyrrhicVictory it looked bad for everyone]]. It's Eggman and his allies who burst in, destroy the attacking Metarex, save Sonic's friends while nobody's looking and ends with Eggman of all people ''[[Awesome/SonicX reprimanding Sonic]] for losing his temper''.

* ''Anime/DanganRonpa3'': Generally in this franchise, if Junko's plans fail, it's because she deliberately left a loophole for them to fail. However, in one of them, there was one thing she didn't think to factor in: what executing Izuru's MoralityPet Chiaki would do to him. While it certainly did push Chiaki's classmates into despair and bring them under her sway, it pushed Izuru ''out'' of despair simply through sheer anger, and thus out of her service. Because of this, he would go on to mastermind the events of [[VisualNovel/SuperDanganRonpa2 the second game]], leading directly to her downfall there and the salvation of not only Chiaki's friends, but the Future Foundation as well.

* In ''Manga/FullmetalAlchemist'', Major Armstrong is injured in his fight against Sloth, until Sloth delivers a blow that accidentally pops his shoulder back into place, giving Armstrong his second wind.
** Though Armstrong probably deliberately placed himself so that Sloth would attack in such a spot that his shoulder popped back.

** Envy decides to [[EvilGloating gloat]] about killing Hughes. To Roy, the victim's best friend. [[PlayingWithFire Who can throw fire around]]. That was a ''[[NoHoldsBarredBeatdown really]]'' bad idea.

** But bigger and longer in the making than all of the above would have to be the series BigBad, who caused his own downfall by one act of kindness. The Dwarf in the Flask (AKA: Father) saved Hoenheim from becoming a human sacrifice along with the rest of Xerxes ''and'' split the resulting philosopher's stone with him, which extended Hoenheim's lifespan well beyond its natural end (both as thanks for being the reason he existed, as Hoenheim's blood was used by an alchemist to create Dwarf in the Flask). Without that, Hoenheim never would have had the opportunity to set up the giant reverse transmutation circle that gave the heroes the chance they needed to fight back in the end. Not to mention fathering Al and, more to the point, [[TheHero Ed]], who ultimately foil the BigBad's plot.

** Sesshomaru has a tendency to inadvertently help Inuyasha almost every time he fights him. His attempts at obtaining [[{{BFS}} Tessaiga]] for himself led to losing an arm, Inuyasha getting it, and subsequent attempts to take it help Inuyasha master it. However, it becomes increasingly obvious that Sesshoumaru is moving away from this trope into IWasJustPassingThrough as begins warming up to his brother (in a TheOnlyOneAllowedToDefeatYou sort of way).

** [[StrawNihilist Shinobu]] [[BigBad Sensui]] kills Yusuke toward the end of the [[HumansAreBastards Chapter Black]] saga, causing him to come back from the dead as a [[HalfHumanHybrid super-demon ]] and kick ass on a nearly-cosmic level. Especially funny since it follows directly after a NiceJobBreakingItHero, when said hero insisted on fighting [[MagnificentBastard Sensui]] at his full, [[KnightTemplar Shinobu]] strength, so he could have a good fight, rather than wiping the floor with [[SplitPersonality 'I Do The Sick Work' Kazuya]] and saving the world. Ironically, Sensui ''wanted'' to die at the hands of a demon, so his actions worked out perfectly.

** Yeah, one of the big themes from the moment Younger Toguro appears is the concept of what is more important: Victory or the fight itself. Pretty much everyone does this to some degree, and about 75% of them were intentional.

* In ''Manga/PokemonSpecial'', there seriously should've been no way for Sapphire to come out on top when in an airtight DrowningPit. The bad guy there with her, Team Aqua's Matt, (who provided himself a means to breathe) could have simply waited a couple minutes until she ran out of air. But no, he provided her with the means ''and'' time to escape by bringing out his [[SharkPool Sharpedo]], letting her break its teeth off, and [[EvilGloating not noticing]] her using said teeth to cut open a hole in the wall. Needless to say, he got owned pretty damn badly.