History GoneHorriblyRight / AnimeAndManga

* In ''Manga/CodenameSailorV'' (of which ''Manga/SailorMoon'' is the MorePopularSpinOff), [[BigBad Danburite]]'s ''real'' plan is to [[spoiler:making Sailor V fall for him]] and use that to make her realize she'll always [[MarriedToTheJob put duty over love]] and awaken her memories of her past life, with her true power along it, before fighting her with his Dark Kingdom-given powers. It works perfectly... And [[CurbStompBattle her one strike is so powerful it overwhelms his strongest attack and makes him slowly disintegrate]].

** In ''Anime/DragonBallSuperBroly'', Freeza kills Broly's father Paragus, remembering that a similar incident caused Goku to reach Super Saiyan. If anyone knows [[TheBerserker how Broly was in Super Saiyan form]] in the non-canon movies, you definitely know how much he just screwed up -- while Goku and Vegeta [[spoiler:learn how to fuse into Gogeta]], Frieza has to serve as an unwanted distraction.

* The BigBad of ''Anime/MagicalGirlLyricalNanohaStrikers'' is a [[spoiler:genetically-engineered MadScientist who turned out to be a lot better at his job than his creators had intended, and [[TurnedAgainstTheirMasters killing said creators]] and nearly toppling TheFederation they were in charge of]]. Interestingly, one of the main heroines of the series, and the one who personally defeats the Big Bad at that, [[spoiler:had years earlier been [[ArtificialHuman created by him]]. As was the case with his own creators, he found that overachieving has its perils.]]

* The BigBad of ''Anime/MagicalGirlLyricalNanohaStrikers'' is a [[spoiler:genetically-engineered MadScientist who turned out to be a lot better at his job than his creators had intended, and [[TurnedAgainstTheirMasters killing said creators and nearly toppling TheFederation they were in charge of]]. Interestingly, one of the main heroines of the series, and the one who personally defeats the Big Bad at that, [[spoiler:had years earlier been [[ArtificialHuman created by him]]. As was the case with his own creators, he found that overachieving has its perils.]]

* The BigBad of ''Anime/MagicalGirlLyricalNanohaStrikers'' is a [[spoiler:genetically-engineered MadScientist who turned out to be a lot better at his job than his creators had intended]]. Interestingly, one of the main heroines of the series, and the one who personally defeats the Big Bad at that, [[spoiler:had years earlier been [[ArtificialHuman created by him]]. As was the case with his own creators, he found that overachieving has its perils.]]

* The scientists in ''Anime/PokemonTheFirstMovie'' created Mewtwo, who was not entirely happy with [[CloningBlues the circumstances of its "birth".]] It was also [[PhysicalGod extremely powerful]]. This... [[StuffBlowingUp didn't work out too well.]]

** Also, the Saiyan race as a whole. Originally a tribe of wandering space barbarians, they were unable to evolve beyond their barbaric level. So they joined Freeza's Army where Freeza offered to uplift them into a technologically advanced, space-faring race in exchange for their services. By then, however, the Saiyans had grown so powerful, and so advanced, as to pose a danger to Freeza himself, who felt compelled to wipe out their race. However, since he had groomed the Saiyans into a spacefaring, unstoppable warrior race, some of them were able to escape. One of them, Goku, eventually defeats Freeza, and Trunks (Vegeta's son) kills him definitely.

** His next creation, Cell, does kill Goku... and also kills his way across the planet, before deciding to destroy it.

** Cell almost fell into this trope before Gohan: after achieving his perfect power, in order to show off his newfound power, he asks Vegeta to hit him with his strongest attack. Turns out that Vegeta's Final Flash is much more powerful than expected: if Vegeta hadn't aimed it away from the Earth, or if Cell didn't try to dodge it at the last second, Cell would've been dead.

** A humorous example: at the start of the Buu saga, Babidi decides to help his minion Puipui against Vegeta (who was kicking his ass) by turning the battlefield into Pocus's homeworld, [[HeavyWorlder that has ten times the gravity of Earth]]. [[DidntSeeThatComing As Vegeta comes from a world with the same gravity and routinely trains in much harsher gravity, it only made things worse for Puipui]].

->''"We dreamed of creating the world's strongest Pokémon...and we succeeded.''"

* The scientists in ''Anime/PokemonTheFirstMovie'' created Mewtwo, who was not entirely happy with [[CloningBlues the circumstances of its "birth".]] It was also [[PhysicalGod extremely powerful]]...that [[StuffBlowingUp didn't work out too well.]]
-->'''Dr. Fuji''': "We dreamed of creating the world's strongest Pokémon...[[FamousLastWords and we succeeded."]]

* ''Webcomic/OnePunchMan'': Saitama wanted to become the hero who could destroy anything in one punch as a child. When he finally becomes that he gets bored of it because there's no challenge in his life.
* ''Manga/MyHeroAcademia'': [[spoiler: Kotaro Shimura]] tried to force his son Tenko to give up on his dream of becoming a hero through systematic abuse. Tenko suffers a psychotic break from accumulated stress and accidentally kills his family with his Quirk, culminating in murdering his father in a blind rage. [[PyrrhicVictory At least he gave up on his dream]]. [[BeCarefulWhatYouWishFor Now he can never be a hero.]] [[spoiler: Tenko, now called Tomura Shigaraki, grows up becoming [[HopeCrusher the Symbol of Fear]], in fact.]]
* ''Anime/DigimonAdventure'': After getting his Crest of Courage, Tai goes above and beyond to get Agumon to digivolve to the Ultimate level, overfeeding him and finally deliberately endangering himself during a battle with Etemon's Greymon. As a result, Greymon digivolves...into [[DemBones Skull]][[DeadlyUpgrade Greymon]], who easily defeats his opponent before going on a rampage.
* In ''Anime/DigimonAdventure02'', when [[GiantSpider Arachnemon]] created [[BetaTestBaddie BlackWarGreymon]] from her own hair and a massive number of Dark Towers from [[TheAtoner Ken's]] former regime, she probably didn't expect him to go insane from reflection over [[CloningBlues the implications of his formation]]. It certainly didn't help matters that he was a [[PowerLevels Mega-level]], and therefore significantly more powerful than anyone in the existing cast (including Arachnemon herself) even up to his death.
* ''Anime/BloodPlus:'' Overlapping with GoneHorriblyWrong. During the UsefulNotes/VietnamWar, the Red Shield forcibly awakens Saya from hibernation to fend off [[OurVampiresAreDifferent chiropterans]]. She does so, but also awakens in a [[BerserkMode psychotic rage]] that leads her to mercilessly butcher both humans and chiropterans left, right, and center.
* In episode 15 and 16 of Season 2's ''Manga/AhMyGoddess'', [[PunchClockVillain Marller]] manages to separate Urd's evil half from her good half and transport it to an artificial body that looks exactly like Urd. Seems to go well for Marller, until evil Urd starts to suffer a SuperPowerMeltdown due to her body being unable to handle the magic being used. In addition, the evil half seems to want to do things even Marller [[EvenEvilHasStandards hadn't thought of, or wanted to do,]] such as taking over the world, rather than simply kicking the goddesses out of Earth.

* ''Manga/{{Monster}}'': Johan Liebert was part of a [[spoiler:social engineering experiment to create vicious, emotionless SuperSoldiers]]. Unfortunately for those in charge, he took to it very well indeed. By which we mean [[spoiler:[[EnfantTerrible no one else made it out alive.]]]]
* ''Manga/ElfenLied'':
** Lucy was part of a [[spoiler:government-supported program to create a new human being that would wipe out and replace the existing humanity with her species]]. Unfortunately, she took to it [[SelfFulfillingProphecy beyond the Kakuzawas' expectations]] (a polite way of saying [[spoiler:[[EnfantTerrible virtually no one else]] [[UnstoppableRage who encountered her made it out alive]]]]).
** [[KidsAreCruel Tomoo]] and his gang of bullies. They decided to literally KickTheDog by beating a puppy Lucy had started to care for to death while [[ForcedToWatch making her watch]], just to see if they could get ''any'' kind of reaction out of her at all. They got a lot more than they bargained for when Lucy snapped and used her [[TraumaticSuperpowerAwakening newly-awakened vectors]] to [[LudicrousGibs splatter them all over the room]].
* ''Manga/{{Saikano}}''. The goal was to make an unstoppable killing machine. The problem came when it became a bit too unstoppable. Eventually, Chise begins to find the whole war pointless. It's all the same, just with different uniforms. If they're all going to die anyway, why should she pick and choose who she kills? At that point, she just starts nuking major cities. This being ''Saikano'', it goes FromBadToWorse.
* The scientists in ''Anime/PokemonTheFirstMovie'' created Mewtwo, who was not entirely happy with [[CloningBlues the circumstances of its "birth".]] It was also [[PhysicalGod extremely powerful]]...that [[StuffBlowingUp didn't work out too well.]]
-->'''Dr. Fuji''': "We dreamed of creating the world's strongest Pokémon...[[FamousLastWords and we succeeded."]]
* ''Manga/FairyTail''
** [[spoiler:Master Hades]], whose EvilPlan involves [[SealedEvilInACan unsealing]] [[spoiler:[[SealedEvilInACan Zeref]]]], the resident [[TheDreaded Dreaded]] of the series. The problem? Not only was [[spoiler:Zeref]] [[SubvertedTrope not sealed in the first place]], he is, in actuality, a WoobieDestroyerOfWorlds who feels an awful lot of guilt about all of the evil things he's done, and [[spoiler:kills Hades for dragging him out of hiding and thrusting him back into world events]]. A classic case of EvilIsNotAToy.
** In the backstory, it turns out there was a civil war between the dragons, one side that believed HumansAreSpecial and deserved to co-exist with as equals, the other (and far larger) that said they're PunyHumans and better off as snacks. Outnumbered and losing the war, the co-existence dragons and their human allies decided to bolster their ranks and prove the dedication of their cause by training the first [[TheDragonslayer Dragon Slayers]] with their Dragon Magic, which did indeed turn the tides in their favor...but what no one counted on were the various side-effects of Dragon Magic on those first Slayers driving them to bloodlust and insanity, as well as [[spoiler:actually turning them into dragons.]] And ''then'' [[spoiler:the most powerful dragon-hating Slayer went completely off the deep end and slaughtered every dragon he could find along with a good number of those Dragon Slayers, before he completely transformed into a dragon and was crowned the "king" of the virtually-extinct race.]] And that is the origin story of [[spoiler:[[GreaterScopeVillain Acnologia]].]]
* The BigBad of ''Anime/MagicalGirlLyricalNanohaStrikers'' is a [[spoiler:genetically-engineered MadScientist who turned out to be a lot better at his job than his creators had intended]]. Interestingly, one of the main heroines of the series, and the one who personally defeats the Big Bad at that, [[spoiler:had years earlier been [[ArtificialHuman created by him]]. As was the case with his own creators, he found that overachieving has its perils.]]
* In ''Anime/UchuuSenkanYamato'', the heroes first use their WaveMotionGun to destroy an enemy base on Jupiter's Floating Continent. To their shock, they find out just how powerful the gun is when the resultant blast destroys the ''entire continent'' and almost destroys their ship. From then on, they're ''far'' more judicious about when to use the thing.
* In ''Anime/{{Robotech}}[=/=]Anime/SuperDimensionFortressMacross'' the SDF-1 is programmed to do a space fold to the moon and is floating above Macross/South Ataria Island when it warps out. Since the crew don't understand entirely how the space fold system ''works'', there are... complications. The warp bubble is large enough to warp out the SDF-1...''and the entire island'', including two ships docked in Macross Bay. Fortunately, the island's denizens are in airtight emergency bunkers, so no one (that we know of) dies. Also, they end up on the far side of [[strike: Mars]] Pluto! However, the people on board the Daedalus and Prometheus aren't so lucky. The Daedalus was an amphibious assault vehicle (not submarine), and the Prometheus was a semi-submersible aircraft carrier. According to the show, neither ship could be hailed and are immediately assumed to have all hands lost due to the neither being designed for space. Roleplaying supplemental information for ''Robotech'' state that the crew of the Prometheus actually survived because of the semi-submersible construction.
** In ''WesternAnimation/RobotechTheShadowChronicles'', Netron-S Missiles turn out to be this. Should even a single missile be detonated on Earth, it would turn Earth into a black hole, obliterating all the Invids and humans still there, AND obliterate the entire RDF fleet.
* The back story, the "scenarios", and the resolution of ''Anime/NeonGenesisEvangelion'' show that GEHIRN, SEELE, and NERV all have far, far worse horribly right effects on their world than anything before.
** In order: GEHIRN wanted to create the ultimate weapons against the Angels by cloning Adam [[spoiler:and Lilith. They succeeded but the things end up being so powerful they cause the end of the world.]] SEELE wanted to cause Third Impact [[spoiler:only to find out that though their plan succeeds, they're going to be trapped in Instrumentality forever, especially when people choose to leave the ocean as Shinji and Asuka did.]] NERV kills all the Angels on SEELE's orders [[spoiler:only to find out that without the Angels, there's nothing stopping SEELE from triggering their plans for the end of the world.]] Lastly, Gendo, commander of NERV, gets his wish [[spoiler:to see Yui again. She despises him for all the evil shit he did to get her back, and allows EVA-01 to kill him.]]
* In ''Anime/YuGiOh'', Gozaburo Kaiba adopts an orphan named Seto to be the heir to his corporation, and puts him through TrainingFromHell to make him as ruthless as possible. A few years later, Seto Kaiba ousts his adoptive father and takes control of [=KaibaCorp=]. Interestingly, Gozaburo played this one [[Franchise/StarWars Palpatine]]-style: Seto succeeded because he'd earned it, and Gozaburo, as the loser, [[DrivenToSuicide had to pay the price]].[[labelnote:*]]In the dub, he [[NeverSayDie ran away and disappeared forever]] -- or at least until season 3.[[/labelnote]]
* In ''Anime/YuGiOhZEXAL'', III is the meekest of the Tron family, possibly qualifying as a MinionWithAnFInEvil. Once he decides that he needs to defeat Yuma to become a strong duelist, he asks Tron for power taken from Haruto in order to give him the confidence he needs. He gets far more than he bargained for; the dark spell turns him into an AxCrazy and sadistic sociopath that almost kills both Yuma and Astral in their worst battle to date.
* In ''[[Anime/YuGiOhARCV Yu-Gi-Oh! ARC-V]]'', the Professor takes advantage of Yuri's strength and trains him to be his most effective ChildSoldier, while encouraging him to enjoy his work. Yuri ends up being one of the strongest villains in the series, but only because he enjoys hurting people. In fact, Yuri enjoys his work so much that he plans on [[OmnicidalManiac carding everyone in the world, until he is the only survivor.]] He later forgets his work to pursue his own interest in finding his dimensional counterparts, defeating them and absorbing them.

* ''[[Manga/{{Guyver}} Guyver: The Bioboosted Armor]]''. [[spoiler:Aliens invent biological symbiotic armor. Good. Aliens invent a new species designed for combat. Great. Aliens give the species the armo-]] ABORT! ABORT! SWEET JESUS, IT HAS A [[WaveMotionGun PARTICLE CANNON]] [[ChestBlaster FOR A TORSO!]]
** And that's only the half of it. [[spoiler:Normal humans were designed as the genetic equivalent of play-doh so that the Aliens could make us into any sort of weapon they wanted, even after birth. The unintended side effect is that they skewed baseline {{Muggle}}s into being far more aggressive than normal evolution would have made us, leading us to be a far more warlike species than we would be otherwise. The other half of it is that if a human were genetically augmented ''and'' given the biological symbiotic armor, they'd be akin to a god.]] Which, of course, is exactly what the bad guy(s) wants for himself.

* The [[EldritchAbomination D-Reaper]] of ''Anime/DigimonTamers'' started out as a [[FromNobodyToNightmare harmless automatic utility program]] designed to delete any data that grows beyond its original parameters and becomes a threat to the integrity of the system. Eventually, it was subdued by the very programs it was built to delete, and was laid to dormancy in the Digital World's center, to eventually fester into a nihilistic cybernetic menace PoweredByAForsakenChild, which began wreaking havoc in both the Digital and Real Worlds. In this, it has a single purpose: follow its prime directive to the letter by deleting anything that grows too much. Unfortunately, by that point, that directive means "[[OmnicidalManiac delete everything]]".
** Also in ''Tamers'', when Leomon is murdered by Beelzemon, Takato flips his shit and ''orders'' Guilmon to evolve to the Ultimate (Mega, in the dub) level and punish him. [[http://wikimon.net/Megidramon He does]]. Both worlds nearly collapse as a result of the mere existence of this thing.
* Researchers in ''Manga/{{BioMeat|Nectar}}'' created the eponymous [=BMs=]. They can and do eat anything except for glass, metal, and fiberglass (and apparently stone), to serve as living waste recyclers. They also are tough enough to ''chew'' through anything short of these materials. They are supposed to be an ultra cheap food source, and so they can multiply extremely rapidly, as long as there is enough food for them. And did we mention that they eat ''anything''? And when some of them get out of containment, horror ensues.
* [[Manga/{{Working}} Mahiru Inami's]] father trained her from birth to instinctively fear all men, so as to [[OverprotectiveDad protect her from any boy that tried to date her.]] Unfortunately, she decided that the best defense was a good offense, and instead ''attacks'' any man that gets within several meters of her, while yelling and crying from fear. Including her father.
* In ''Manga/KoeDeOshigoto'', Kanna nervously asks her sister what anal sex is like, because she doesn't know how to convey it through her acting, but Yayoi just tells her that she should "completely become the character of the game" and assume that it feels good. A short while later in the recording booth, she goes so far into character that she actually tries to initiate anal sex with Motoki.
* In ''VisualNovel/DaCapo'', the Giant Sakura Tree was intended to look after Sakura after her grandmother's death and use its magic to [[BeCarefulWhatYouWishFor fulfill all her wishes.]] Unfortunately, Sakura grows up to be a [[ClingyJealousGirl clingy jealous]] {{Yandere}} on the losing end of a love triangle [[MurderTheHypotenuse and the tree grants subconscious wishes.]]
** This is only in the anime. In the original VisualNovel Sakura is doing it unconsciously [[RealityWarper herself]].

** From Kyubey's point of view, throughout the series he tries to get Madoka to make a pact with him because of her potential for enormous power [[spoiler:which will also make her an incredibly powerful witch]]. When he finally manages to arrange matters in such a way that Madoka decides to make a pact with him, the wish that she makes as part of the pact [[spoiler:rewrites reality and completely changes the nature of the whole magical girl system, making it so that no witches - including the future Witch!Madoka herself - ''ever existed''.]] And with all the accumulated power on her side, ''Kyuubey cannot deny her said wish''. [[VillainousBreakdown He doesn't like that]].

* ''Manga/KodokuExperiment'' is basically "Gone Horribly Right The Manga". The ManipulativeBitch Captain Bagures and leader of the research spacecraft, who as part of an experiment to create the perfect biological weapon, takes a bunch of vicious carnivorous engineered creatures and puts them on another planet so they fight for survival and leave the strongest one standing. With the planet dying and ready to explode, a military team is sent down on the inhospitable planet. Unbeknownst to them they were all simply another part of the Captain's twisted experiments, and they all die horribly except for one last survivor, who promises revenge on the Captain before his memories are assimilated by a nearby literal StarfishAlien. The alien is not only NighInvulnerable as it survives the planetary explosion in the form of a shriveled up fossil, but it is also TheVirus when it creates more versions of itself simply by flashing some alien light from its eyestalks on any unfortunate onlooker, [[http://mangafox.me/manga/kodoku_experiment/v01/c003/17.html even through video recordings]]. This is in addition to its vast array of other abilities, all of them veered towards a RoaringRampageOfRevenge against the Captain.
* ''Manga/OnePiece'':
** A lesser example in the Enies Lobby arc: Nami's [[WeatherControlMachine Perfect Clima-Tact]] works ''too'' well when she first tried it, and leaves her as scared as her enemies.
** Occurs to Trafalgar Law during the Pirate Alliance arc. He teamed up with the Straw Hats since he has faith in Luffy's ability as a [[spoiler: fellow]] D to wreak havoc and wants that havoc on his side, at least, since the Straw Hats are already there. He got ''way'' more than he bargained for and found himself constantly stunned by the Straw Hats' antics. Thankfully, the trope worked out in the end as Law really was right about Luffy...he just had to endure their sanity-destroying quirks for a while because of it.
** Happens to Sugar on Dressrosa. Realizing Usopp is terrified of her and that the rebels attempted to knock her out with a poisoned grape, she grabs it and force-feeds it to Usopp to revel in his terror...only for his FreakOut to so terrify her that she faints, accomplishing the rebels' goal.
* In the anime adaptation of ''Literature/MayaTheBee'', the title heroine is tasked with gathering pollen from around her hive. So she does. ''All of it''. So now she gets sent far out from the hive to find more.

* [[MagnificentBastard Aizen Souske]], of ''{{Manga/Bleach}}'', set in motion a 100 year long plan to become a PhysicalGod. In order to test his new powers against a WorthyOpponent, he set in motion a plan to have [[TheHero Ichigo Kurosaki]] become one as well. [[spoiler:Aizen became absurdly powerful, but he never transcended the limits of Soul Reapers and Hollows. Ichigo however, did, leaving Aizen no match for him.]]
* One episode of ''Anime/GhostInTheShellStandAloneComplex'' has the Major come across an artificially-sustained human brain. Within its mental world is a theater constantly playing a movie so emotionally gripping that, until this point, no one who dove in ever wanted to leave. [[TheStoic The Major]] managed to resist, but not before (in a showing of its emotional grip) the film drew a rare tear out of her.
* In one episode of ''Anime/{{Doraemon}}'', Suneo and his mom get ahold of Doraemon's amazing blanket that can make old things like new. Suneo's mom has an old ratty crocodile purse that isn't what it used to be. She uses the blanket on it, making it [[NeverSmileAtACrocodile exactly what it used to be.]]
* ''Manga/GreatTeacherOnizuka'': After discovering that Ōgi, the teacher she had a crush on, was already engaged and that he had only invited her to dinner to introduce her to his fiancée, a scorned Miyabi takes illicit photographs of herself (knowing that his hobby was photography) and tells the class that he took advantage of her. However, Miyabi's plan works too well; her classmate Takumi Ishida takes matters into his own hands and assaults Ōgi, resulting in Takumi being expelled and Ōgi being fired.
* PlayedForLaughs in ''Manga/ACertainScientificRailgun''. One of Misaki Shokuhou's followers, Junko, tries to get Misaki and Mikoto closer together by asking them to use a technology to share dreams. Though they're not interested, it does work indirectly. When they find out that one of the dream makers is giving out sex dreams about them, they join forces to destroy him completely.
-->'''Mikoto:''' '''Excuse me. I think I need to visit the next shop over...'''\\
'''Junko:''' She's going to kill them! Queen, you have to stop--\\
'''Misaki:''' '''Today, I'll do you a favor of [[MindControl altering the witnesses' memory abilities]]. You handle [[ShockAndAwe the security cameras]].'''\\
'''Junko:''' Oh no, together, these two can easily commit the perfect crime!!
* A minor one, but in ''Manga/{{Berserk}}'' Guts constantly seeks purpose in life. This eventually leads him to helping Grifith reach his dream, only to realize that once that's fulfilled Guts will not have a purpose anymore. This leads him to leave the Band of the Hawk which then sets in motion the series of events that give Guts a purpose at last: [[spoiler: getting revenge]].
* One of Kaguya's plans in ''Manga/KaguyaSamaLoveIsWar'' involved tricking Shirogane into using love tips from a girls magazine on her so she could prove that he liked her (ItMakesSenseInContext). All three of the steps end up working perfectly on her (she even ends up having a HeroicBSOD when he gets to the "[[{{Tsundere}} say you hate them]]" step, despite the fact that she knew he was faking it).
* In ''Anime/Danganronpa3'', Ryouta's plans to [[spoiler: create an anime full of hope that includes brainwashing methods ended up working perfectly bringing [[BigBad Junko]] [[HopeCrusher Enoshima]] to tears. However, she used that anime to her benefit by brainwashing Class 77-B and Chisa to be members of the Ultimate Despair.]]
* In ''Anime/MobileSuitGundamMSIgloo'', Zeon creates a Mobile Suit known as the "GM Camouf", a Zaku frame armored up to look like a GM designed for a FalseFlagOperation. It worked too well as an entire squad of Camoufs were destroyed by their own Musai transport.
* ''Anime/MobileSuitGundamIronBloodedOrphans'' is set in a world where war orphans are often scooped up by PrivateMilitaryContractors and used as cheap, expendable labor -- and there's one subset that has it even worse, being labeled "Human Debris" and being little better than slaves. The protagonists are a group of such orphans who [[TurnedAgainstTheirMasters overthrow their abusive bosses]], take over the PMC, and then become famous after their first job (to escort a VIP to Earth) leads to them saving Edmonton, Canada from a madman in a SuperPrototype. The OpeningNarration for the second season reveals that there's been a severe uptick in the number of ChildSoldiers and Human Debris employed by [=PMCs=], because the protagonists are living proof of how effective they can be.
* In Part 4 of ''Manga/JoJosBizarreAdventure'', Josuke is fighting Rohan Kishibe who's powers require his victim to look at one of his drawings to work. Josuke gets around this by keeping his eyes closed, even when stabbed by sharp objects. Rohan intentionally pushes Josuke's BerserkButton by insulting his hair, hoping to get him to open his eyes in anger. Josuke opens his eyes, but he gets so angry he becomes literally blind with rage, ignoring the drawing entirely and brutally pummels Rohan.
** At the end of [[Manga/JoJosBizarreAdventurePhantomBlood Part 1]], [[spoiler: [[BigBad Dio Brando]] fatally wounds Jonathan Joestar but before Jonathan dies [[HeroicSacrifice he saves everyone from Dio]] [[TooGoodForThisSinfulEarth by simply holding Dio's head]], Jonathan Joestar GoesOutWithASmile and when Dio tried to give a DealWithTheDevil with Jonathan [[YouAreTooLate it was too late, Jonathan is dead]] and [[Manga/JoJosBizarreAdventureStardustCrusaders it would take a long time before DIO becomes a threat again]].]]
* PlayedForLaughs in episode 4 of ''Manga/BlendS''. After noticing some [[CosplayCafe Cafe Stile]] customers still think Maika isn't {{sadist}}ic enough for her role, the cast tries to train her in that direction. The result is a Maika that acts like a dominatrix, which the cast unanimously agree is overly hardcore for a CosplayCafe.
* In ''Anime/KinnikumanNisei'', we learn that to keep his son Mantaro from being intimidated by his father's reputation as a wrestling superhero, Manga/{{Kinnikuman}} had all of the videos and photos of his matches destroyed. This worked a little too well- Mantaro has virtually no respect for his over-the-hill dad, and thinks his matches were all fixed! And this in turn plays into Tel Tel Boy's defeat; during his match against Mantaro, Tel Tel Boy uses his illusion powers to make Mantaro think he's fighting Suguru, as "All children fear their parents". This backfires, as while Mantaro was scared spitless of the Evil Choujin, thinking he's facing his BumblingDad gives him the confidence to attack Tel Tel Boy head-on!
-->'''MAX Man:''' Why isn't the Trauma Call working?!\\
'''Meat:''' Oh, it's working, all right. Perfectly!
* PlayedForLaughs in one chapter of ''Manga/BoardingSchoolJuliet''. When Juliet gets swamped by little girls who want to spend time with her, Romio pretends to be a pedophile (NightmareFace and all) in order to shoo them away and he and Juliet can go on their lunch date. It worked: the little girls are scared witless and run away. Unfortunately for Romio, his act convinced Juliet as well.
* In ''Anime/ReCreators'', the main cast decides to record the final battle between the Creations and the main antagonist as a TV special, thereby trapping her in a work of fiction and forcing her to play by its (and the audience's) rules. It works particularly well...so well, in fact, that the heroes are now trapped ''with'' her. [[spoiler:As a fanwork-only character, Altair's powers ''by default'' are acceptable to the fans, thus she can bolster her power with anything a fan's cooked up for her. And since the heroes are part of the show as well, their special-only powerups get criticised by the fans as too much of an in-universe AssPull to keep Altair down.]]
* ''Shiori Experience'' has the protagonist band stuck in a rut after a disastrous performance and [[spoiler:their club president being so demoralized that she decides to quit the band, since she felt like she had no place as a sax player in a rock group]]. To win them over and make efforts to improve themselves, they take time off to perfect their instruments and pump their in-progress song with so much passion that they hope will get their message out. In the end, they ''did'' improve immensely, and they ''were'' able to make their feelings known--but they only proved the president right, in that [[spoiler:the song no longer has room for a saxophone part. And she only came back to resign.]]
* ''Manga/DoctorSlump'':
** The chapter "Citizen Arale" starts with [[HotTeacher Midori]] telling her class to "bring a lost item to the police" as part of her lesson on "how to be good citizens". Too bad Arale, a CloudCuckoolander RobotGirl with SuperStrength, ''really'' takes her lesson to heart, and starts by taking a book Midori drops, not to her (even though she's right next to Arale at that moment), but to the police, and her applications of the lesson only escalate from there and last through the rest of the chapter. By the time the chapter ends, [[ToiletHumour she has brought to the police loads of poop she found on the roadside]], plus every car, house, ''and'' mountain she sees and takes to the police, making the police station and its surrounding area look like a junkyard as a result.
** The chapter "Mr. Handy", has [[BunglingInventor Senbei]] using his eponymous creation to allow him to move around within it without much trouble. He's so impressed with its performance, he never leaves it -- in fact, he sleeps in it. [[RealityEnsues A month later, his body odor reaches foul levels because he neglects to shower throughout his time in his creation, and, due to his lack of exercise because he's been inside it the whole month, his body becomes so plump that Arale rolls him around like a ball.]]

* ''Manga/FairyTail'' has [[spoiler:Master Hades]], whose EvilPlan involves [[SealedEvilInACan unsealing]] [[spoiler:[[SealedEvilInACan Zeref]]]], the resident [[TheDreaded Dreaded]] of the series. The problem? Not only was [[spoiler:Zeref]] [[SubvertedTrope not sealed in the first place]], he is, in actuality, a WoobieDestroyerOfWorlds who feels an awful lot of guilt about all of the evil things he's done, and [[spoiler:kills Hades for dragging him out of hiding and thrusting him back into world events]]. A classic case of EvilIsNotAToy.

* ''Manga/MyHeroAcademia'': [[spoiler: Kotaro Shimura]] tried to force his son Tenko to give up on his dream of becoming a hero through systematic abuse. Tenko suffers a psychotic break from accumulated stress and accidentally kills his family with his Quirk, culminating in murdering his father in a blind rage. [[PyrrhicVictory At least he gave up on his dream]]. [[BeCarefulWhatYouWishFor Now he can never be a hero.]] [[spoiler: Tenko, now called Tomura Shigaraki, grows up becoming [[LegionOfDoom quite the opposite]], in fact.]]

* ''Manga/MyHeroAcademia'': [[spoiler: Kotaro Shimura]] tried to force his son to give up on his dream of becoming a hero through systematic abuse. His son suffers a psychotic break from accumulated stress and accidentally kills his family with his quirk, culminating in murdering his father in a blind rage. [[PyrrhicVictory At least he gave up on his dream]]. [[BeCarefulWhatYouWishFor Now he can never be a hero.]] [[spoiler: Tomura grows up becoming [[LegionOfDoom quite the opposite]], in fact.]]

* The scientists in ''Anime/PokemonTheFirstMovie'' created Mewtwo, who was not entirely happy with [[CloningBlues the circumstances of its "birth"]]. It was also [[PhysicalGod extremely powerful]]... that [[StuffBlowingUp didn't work out too well.]]

* In ''Anime/YuGiOhZexal'', III is the meekest of the Tron family, possibly qualifying as a MinionWithAnFInEvil. Once he decides that he needs to defeat Yuma to become a strong duelist, he asks Tron for power taken from Haruto in order to give him the confidence he needs. He gets far more than he bargained for; the dark spell turns him into an AxCrazy and sadistic sociopath that almost kills both Yuma and Astral in their worst battle to date.

* In ''VisualNovel/DaCapo'', the Giant Sakura Tree was intended to look after Sakura after her grandmother's death and use its magic to [[BeCarefulWhatYouWishFor fulfill all her wishes.]] Unfortunately, Sakura grows up to be a [[ClingyJealousGirl clingy jealous]] {{Yandere}} on the losing end of a love triangle [[MurderTheHypotenuse and the tree grants subconcious wishes.]]

* From Kyubey's point of view in ''Anime/PuellaMagiMadokaMagica'': throughout the series he tries to get Madoka to make a pact with him because of her potential for enormous power [[spoiler:which will also make her an incredibly powerful witch]]. When he finally manages to arrange matters in such a way that Madoka decides to make a pact with him, the wish that she makes as part of the pact [[spoiler:rewrites reality and completely changes the nature of the whole magical girl system, making it so that no witches - including the future Witch!Madoka herself - ''ever existed''.]] And with all the accumulated power on her side, ''Kyuubey cannot deny her said wish''. [[VillainousBreakdown He doesn't like that]].

* [[MagnificentBastard Aizen Souske]], of ''{{Manga/Bleach}}'', set in motion a 100 year long plan to become a PhysicalGod. In order to test his new powers against a WorthyOpponent, he set in motion a plan to have [[TheHero Ichigo Kurosaki]] become one as well. [[spoiler:Aizen became absurdly powerful, but he never transcended the limits of Soul Reapers and Hollows. Ichigo however, did.]]

'''Misaki:''' '''Today, I'll do you a favor of [[MindControl altering the witnesses' memory abilities]]. You handle[[ShockAndAwe the security cameras]].'''\\

* ''Shiori Experience'' has the protagonist bandstuck in a rut after a disastrous performance and [[spoiler:their club president being so demoralized that she decides to quit the band, since she felt like she had no place as a sax player in a rock group]]. To win them over and make efforts to improve themselves, they take time off to perfect their instruments and pump their in-progress song with so much passion that they hope will get their message out. In the end, they ''did'' improve immensely, and they ''were'' able to make their feelings known--but they only proved the president right, in that [[spoiler:the song no longer has room for a saxophone part. And she only came back to resign.]]

* In Anime/Danganronpa3, Ryouta's plans to [[spoiler: create an anime full of hope that includes brainwashing methods ended up working perfectly bringing [[BigBad Junko]] [[HopeCrusher Enoshima]] to tears. However, she used that anime to her benefit by brainwashing Class 77-B and Chisa to be members of the Ultimate Despair.]]

* [[spoiler:Nina]] of ''Anime/CodeGeass'' feels this way upon seeing the aftermath of her invention, [[spoiler:the FLEIJA warhead]]. Hint: [[spoiler:it goes off in the middle of [[TheTokyoFireball Tokyo]], causing 35 ''million'' casualties.]] Though many fans still give her NoSympathy, as they point out "what else do you expect when you are [[spoiler:designing a nuke?!?]]".
** Of course, "[[spoiler:being used to destroy your own countries' cities ''without'' being stolen]]" is probably not on the list of outcomes to expect. Because obviously tens of millions of people dying is only a big deal when it happens to people from your country.

** The Androids. Dr. Gero creates the Androids in order to kill Goku, but the Androids are too strong to be controlled, and kill Dr. Gero instead. He kind of brought this on himself though, since he made the two out of runaway teenagers ''that he kidnapped''- no freaking wonder they hated him.

** At the end of [[Manga/JoJosBizarreAdventurePhantomBlood Part 1]], [[spoiler: [[BigBad Dio Brando]] fatally wounds Jonathan Joestar but before Jonathan dies [[HeroicSacrifice he saves everyone from Dio]] [[TooGoodForThisSinfulEarth by simply holding Dio's head]], Jonathan Joestar GoesOutWithASmile and when Dio tried to give a DealWithTheDevil with Jonathan [[YouAreTooLate it was already too late, Jonathan was already dead]] and [[Manga/JoJosBizarreAdventureStardustCrusaders it would take a long time before DIO becomes a threat again]].]]

* At the end of [[Manga/JoJosBizarreAdventurePhantomBlood Part 1]], [[spoiler: [[BigBad Dio Brando]] fatally wounds Jonathan Joestar but before Jonathan dies [[HeroicSacrifice he saves everyone from Dio]] [[TooGoodForThisSinfulEarth by simply holding Dio's head]], Jonathan Joestar GoesOutWithASmile and when Dio tried to give a DealWithTheDevil with Jonathan [[YouAreTooLate it was already too late, Jonathan was already dead]] and [[Manga/JoJosBizarreAdventureStardustCrusaders it would take a long time before DIO becomes a threat again]].]]

->''"We dreamed of creating the world's strongest Pokémon... and we succeeded.''"
-->-- '''Dr. Fuji's''' [[FamousLastWords last words]], ''Anime/PokemonTheFirstMovie''

* ''Anime/DigimonAdventure'': After getting his Crest of Courage, Tai goes above and beyond to get Agumon to digivolve to the Ultimate level, overfeeding him and finally deliberately endangering himself during a battle with Etemon's Greymon. As a result, Greymon digivolves... into [[DemBones Skull]][[SuperpoweredEvilSide Greymon]], who easily defeats his opponent before going on a rampage.
* In ''Anime/DigimonAdventure02'', when [[GiantSpider Arachnemon]] created [[BetaTestBaddie BlackWarGreymon]] from her own hair and a massive number of Dark Towers from [[TheAtoner Ken's]] former regime, she probably didn't expect him to go insane from reflection over [[CloningBlues the implications of his formation]]. It certainly didn't help matters that he was a [[PowerLevels Mega-level]], and therefore significantly more powerful than anyone in the existing cast even up to his death.

* ''Manga/MyHeroAcademia'': [[spoiler: Kotaro Shimura]] tried to force his son to give up on his dream of becoming a hero though systematic abuse. His son suffers a psychotic break from accumulated stress and accidentally kills his family with his quirk, culminating in murdering his father in a blind rage. [[PyrrhicVictory At least he gave up on his dream]]. [[BeCarefulWhatYouWishFor Now he can never be a hero.]] [[spoiler: Tomura grows up becoming [[LegionOfDoom quite the opposite]], in fact.]]

->''"We dreamed of creating the world's strongest Pokémon...and we succeeded.''"