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* An example of this played for humour is the [[BokeAndTsukkomiRoutine comedy duo]]/LovelyAngels Love Pheromone in ''Anime/AkahoriGedouHourLovege''. For even the slightest misdemeanor against them (such as calling Aimi [[ACupAngst flat-chested]]), they will destroy anything in the surrounding area with their {{Powered Armor}}s. They have no HeroInsurance whatsoever and are, in fact, seen as villains by nearly everyone. Yet all the while, they claim that "Anything can be done in the name of justice!"
* Akira in ''Manga/AoNoFuuin'' becomes one as the story proceeds. His duty as the Byakko is to kill Oni, but as things happen, more and more Oni appear and he starts to go along the idea of "A dead Oni is a good Oni". While he certainly ''is'' only fulfilling his duty and Oni are presented as bloodthirsty, violent people who feast on humans, it's also portrayed as a very bad turn of his character and adds to the story's GreyAndGrayMorality.
* The Holy Iron Chain Knights in ''Manga/{{Berserk}}'' are devoted to smiting out all traces of evil. The problem: they include "anyone not following our exact procedures for demon-smiting" under "evil". Because of a prophecy about a Hawk of Light, which they consider the newly-reincarnated BigBad Griffith to be, and a Hawk of Darkness, which they consider AntiHero Guts to be (though it's actually [[spoiler: Griffith as Femto]]), things go downhill in a hurry. Doubly applies to Inquisitor Mozgus, who believes in horrifically torturing people to "expiate their sins". The thing is, the Holy Iron Chain Knights are supposed to be strictly a ceremonial guard consisting of young noblemen whose parents wanted their heirs to have all the prestige of military service with none of the danger. It is their leader, Farnese, who is completely and fanatically dedicated to the cause. She gets better, thankfully.
* Satyajit Shyamalan from ''[[Anime/BirdyTheMighty Birdy the Mighty: Decode]]'' is this, believing that it's his duty as one of the "chosen" to [[spoiler: use an alien super weapon to wipe out all of humanity except the "chosen" few.]] He never once remotely considers that he might not be doing the right thing, or even that he might not succeed, and he ultimately [[spoiler: gets killed by that same super weapon without ever realizing his mistake]].
* ''Manga/BlackButler'': [[spoiler: [[OurAngelsAreDifferent Ash/Angela]] and [[{{Yandere}} Queen Victoria]]]] just want to make England a [[LightIsNotGood brighter]], {{pure|IsNotGood}}r place in Season One.
** [[spoiler: Ash/Angela even gets bonus points for being an utter {{Hypocrite}}, doing things themself that they see as capital offenses in humans.]]
* ''Buraiden Gai'': the Director of the Human Institute.
* Suzaku of ''Anime/CodeGeass'' starts out as a WideEyedIdealist and a KnightInShiningArmor. After [[spoiler:Euphemia's death]], he falls into Knight Templar territory when he starts conquering/enslaving other countries for the Emperor in the hopes of gaining control over Japan some day. [[spoiler:Eventually, after a couple of MyGodWhatHaveIDone moments, he gets better -- or at least self-aware enough to point his NecessarilyEvil tendencies in the right direction.]]
** Many of the major noble characters in the Holy Britannian Empire are self-righteous. The Emperor believes that what he's planning to do is so righteous that conquering and dehumanising entire countries, [[spoiler:which is the opposite of the ideology he claims]], is justifiable, even though it's only buying him time. [[spoiler:Schneizel, too, believes that world peace is worth murdering somewhere around 10 digits worth of people and then oppressing the remainder for.]] Even ''[[PsychopathicManchild Mao]]'' has his Knight Templar moments, though he doesn't seem to care enough to actually ''be'' a Knight Templar.
* Kinshirou Kusatsu in ''Anime/CuteHighEarthDefenseClubLove'' verges heavily on this. Convinced of his wealth, social status, all-around superiority, and possession of an evil green hedgehog, he believes in world domination by the elite few -- namely, him and his two [[strike:minions]] friends, Arima and Akoya.
* ''Manga/DeathNote'''s main character, Light Yagami, a.k.a. "Kira", is a Knight Templar, [[spoiler: though he's not as severe on punishment as other Death Note users]]. In fact, most of the interesting characters at least border on this; L is willing to torture people (albeit [[spoiler:another Death Note user]]) to capture Kira, Mikami is eager to kill for Justice, Misa for love, and Light himself...This series has an extra-lubricated [[JumpingOffTheSlipperySlope Slippery Slope]].
* The Royal Knights organization from the various versions of ''Franchise/{{Digimon}}'' are the incarnations of this trope, following anyone who possesses holy or god-like powers with a sense of unquestioning dogmatic loyalty. Usually, whoever is bossing them around goes nuts, and they end up acting as honorable villains until several of them wise up and turn "true good".
** [[Anime/DigimonFrontier Lucemon]] is a prime example.
** The Hypnos organization in ''Anime/DigimonTamers'' are Knights Templar. They seek to protect the world from dangerous Digimon, but employ ludicrously indiscriminate (and almost never effective) tactics in doing so. They are horrific, genocidal, and downright brutal when it comes to actually dealing with the Digimon. Especially the ones that they [[KickTheDog catch]]...
* ''Anime/DragonballSuper'': Zamasu, Supreme Kai-in-training of Universe 10, seems to have this as his primary character trait. He's disgusted by the fact that mortal beings are flawed, and believes the very existence of mortals to be a blight upon the universe. He argues at one point that, as a god, his duty should be to annihilate evil wherever he finds it. His mentor, Gowasu, praises his strong sense of justice but condemns his lack of compassion, saying that their duty should be to guide mortals and help them improve themselves. [[spoiler:In the end, his desire to create a "perfect" universe leads him to commit ''multiversal genocide'' on both the mortals and the gods who would stop him]].
* The 12th from ''Manga/FutureDiary'' is definitely this.
* A large number of ''Franchise/{{Gundam}}'' antagonists are this. Most Zeon high officials such as Gihren Zabi and Anavel Gato in ''[[Anime/MobileSuitGundam0083StardustMemory Gundam 0083]]'' fervently believe that Zeon is in the right and are willing to sabotage any efforts for peace between their side and TheFederation -- with superweapons such as [[NukeEm nukes]] and [[ColonyDrop colony drops.]]
** VillainProtagonist [[spoiler:Flit Asuno]] from ''[[Anime/MobileSuitGundamAge Gundam AGE]]'' is especially worth mentioning with his quest of vengeance against ALL the Unknown Enemies [[spoiler:(Vagan)]] in the name of the [[DarkMessiah Messiah]] for Earth.
* The Vatican's elite [[ChurchMilitant Iscariot]] [[VampireHunter Section]] [[BloodKnight XIII]] in the anime and manga ''Manga/{{Hellsing}}''. Not that the protagonists are [[BlackAndGrayMorality much better]].
** Ironically, this is actually downplayed with Father Alexander Anderson. Yes, he's a bit indiscriminate in his targeting of vampires, as poor Seras has learned the hard way. Otherwise, not so much. And this is proven during Maxwell's Holy Crusade upon Protestant England; instead of backing up the genocidal Maxwell, Anderson is completely disgusted by his bloodlust and the killing of so many innocent Christians and [[spoiler: readily assists Alucard in killing him.]]
** As shown above, Maxwell is even more AxCrazy and fanatical than Anderson, which is truly amazing. Unlike his mentor, Maxwell is willing to kill millions of innocent civilians just to satisfy his own DrunkWithPower ego, and finds an entire army of equally nuts clergy members to help him. It's the main reason why Anderson has to [[spoiler: waste him.]]
** Anderson's protégés, [[BadassNormal Heinkel]] and [[CuteAndPsycho Yumie]], tend to lean towards this as well. However, unlike Maxwell, both they and another large chunk of Iscariot (many of whom were also raised by the [[ParentalSubstitute Scottish priest]]) are directly under Anderson's influence, so they don't take the fanaticism or blood-letting quite so far.
* ''Manga/JoJosBizarreAdventure'' has Enrico Pucci in its sixth part. Pucci is a somewhat unusual case in that he ''was'' manipulated by a CardCarryingVillain (Dio Brando himself, no less!), but he nonetheless believes that what he does is what God desires - for woe to be removed from humanity. [[spoiler: By accelerating time to the point that the cosmos resets and then repeats itself, he's going to make humanity subconsciously aware of everything that will ever befall them in the future, meaning that they'll never be struck with shock, terror, etc. Instead, they should all be in a state of fatalistic, calm acceptance.]] The villainous part comes from his willingness to manipulate the various prisoners whom he imbues with Stands, and killing the Joestars and anyone else trying to obstruct him as barricades to God's will. [[spoiler: In fact, one could argue that the final confrontation between him and Emporio, and Pucci's plans to make everyone aware of Fate being brought to nothing, is essentially UtopiaJustifiesTheMeans getting completely refuted as unjust and untenable.]]
* [[spoiler:Admiral Haruki Kusakabe]] from ''[[Anime/MartianSuccessorNadesico Nadesico]]'' is a particularly evil Knight Templar, especially in the movie, where he crosses the MoralEventHorizon.
--> "There is only ''one'' Justice, and it is obviously on ''my'' side."
** He might be more of a hypocritical, propaganda-loving [[TakeOverTheWorld megalomaniac]], however. His underling Genichiro Tsukiomi, on the other hand, [[spoiler:assassinates his best friend at a peace conference for ''daring'' to negotiate with the evil Earthlings, on Kusakabe's orders. He's become TheAtoner by the time of the movie, however.]]
* Duo and Slur from the ''[[VideoGame/MegaManBattleNetwork RockMan.EXE]]'' saga. Slur, in particular, is another example of a thoroughly evil Knight Templar.
* ''Manga/{{Naruto}}'' has a few villains who count as this trope rather than WellIntentionedExtremist.
** Danzo Shimura is one. While he does acknowledge that some of his actions are [[NecessarilyEvil morally reprehensible]], the lengths he is willing to go to, his conviction that only he can save the world, and the fact that he still believes his methods to be fully justified even when they ''cause most of the problems in the series'', pushes him over the edge from WellIntentionedExtremist into this trope.
** Toneri from ''The Last'' movie isn't really well-intentioned considering his goal to destroy Earth won't benefit anyone. He still counts as a Knight Templar because he thinks destroying the Earthlings for abusing Chakra is a decree from his ancestor, making him the "hero". [[spoiler:Of course, he's unaware that it's really just propaganda from the Otsutsuki branch family who misinterpreted Hamura's will and has a HeelRealization upon learning the truth]].
* [[TheOmniscientCouncilOfVagueness SEELE]] in ''Anime/NeonGenesisEvangelion'' is perfectly willing to torture young children, [[spoiler:kill everyone in NERV, followed shortly by everybody ''[[TheEndOfTheWorldAsWeKnowIt in the entire world]]'', horribly, to unite mankind in a "[[UtopiaJustifiesTheMeans perfect]]" state of existence to gain transcendence and evolve humanity to it's next stage]]. At least the [[EldritchAbomination Angels]] weren't so pretentious.
* The religious branch of the AncientConspiracy "Soldats" in ''Anime/{{Noir}}'' were this way, despite the ironic creation of Soldats due to their persecution 1,000 years ago. Altena, similarly, will stop at nothing to see her ideals realized, for the sake of humanity, no matter how many must die, Les Soldats or otherwise.
* In ''Manga/OnePiece'', since the [[VillainProtagonist heroes are pirates]], many of the Marine officers are Knights Templar, the most notable of whom is probably [[spoiler:Admiral Akainu. The very first thing we see him do is [[MoralEventHorizon blow up a civilian ship]] simply because they ''might'' have one of the archaeologists the World Government wanted to wipe out aboard. They didn't]].
** Some of the Marines, such as Akainu and Lucci, are downright dogmatic in their devotion to the concept of "absolute justice" and can give the impression of a massive, sprawling organization comprised almost entirely of Knights Templar. This is somewhat tempered by the presence of more reasonable characters like Smoker, Garp, or Aokiji. [[spoiler:After the TimeSkip, two of those examples are no longer in the Marines, largely in part due to protesting the actions of people like Akainu.]]
** And now we've got a slighter version in the Fishman Society. Since the World Government have been heavily invoking HumansAreTheRealMonsters on the fishmen, some of the more extreme segments are ready to wage war on the entire effing world to secure decent treatment of their kin. Suffice it to say that most of said kin realize how batshit insane a solution this is.
* [[BigBad Takeshi Hirokawa]] of ''Manga/{{Parasyte}}'' believes humans are irredeemable monsters for the damage they have caused to the environment and that [[GaiasVengeance parasites were sent to wipe them out]]. His faith in this cause is so strong that he launches a political campaign and becomes Mayor of East Fukuyama City so he can designate feeding grounds for parasites to keep the hunters from being caught. When [[spoiler: the police raid his office, he spends his last moments lecturing them that he is righteous and that humanity is vile, even showing an expression of shock when they fatally shoot him after he finishes speaking]].
* ''Manga/ThePrinceOfTennis''' Rikkaidai tennis team, who will stop at nothing to win. Especially their captain, [[spoiler:Seiichi Yukimura, after he gets better from his illness]].
* ''Anime/PuellaMagiMadokaMagica'': Sayaka starts heading this way after she becomes a MagicalGirl, and eventually [[spoiler:[[AndThenJohnWasAZombie becomes the very thing she's fighting against]]]] -- [[spoiler:this is the eventual fate of all magical girls of the series]].
** Thanks to [[spoiler: going back in time several times to try to prevent Madoka from dying and becoming a witch, and watching her friends die and the destruction caused by Walpurgisnacht]], Homura becomes one in order to [[spoiler:prevent Madoka from becoming a witch]].
** Some of the witches are this. Elsa Maria "saves" people by absorbing them into her barrier. Kriemhild Gretchen, [[spoiler: Madoka's witch form in the alternate timelines]], wants to do the same thing to [[KillAllHumans everyone in the world]].
** Then of course you have [[spoiler: The Incubators of whom Kyuubi is part of. Beings who are trying to starve off the heat death of the universe by gathering the energy of despair from the girls that make a contract with them then eventually turn into witches. They honestly believe their doing good for the universe even if it comes at the cost of lives, both from the girls that turn and the human victims who're unaware of them.]]
* ''Manga/RosarioToVampire'': Fairy Tale is a [[ANaziByAnyOtherName Nazi-esque]] terrorist organization that is firmly convinced that HumansAreTheRealMonsters and wants to wipe them out and conquer the world for monsters. Of course, a significant chunk of their time and resources is also spent towards oppressing and killing their fellow monsters for not agreeing with their extremist views; Kuyou, the former head of Yokai Academy's Security Committee, and secretly TheMole for Fairy Tale, comes right out and says that humans are disgusting scum and vermin who are worthy only of death, even flat-out telling Moka and the rest of Tsukune's UnwantedHarem that they deserve to die simply for even ''daring'' to associate with a human.
* ''Manga/RurouniKenshin'': The eponymous hero was this during his assassin days for the Ishin Shishi: a vicious assassin who would kill in cold blood if he thought it would bring about a peaceful era. Thanks to a series of tragic events, he eventually has a HeelRealization and becomes TheAtoner. Unfortunately, due to a combination of [[DeathSeeker self-destructive tendencies]], BerserkButton, and [[ShellShockedVeteran trauma]], Kenshin's former "Battousai"-self now manifests as a [[SupernaturalGoldEyes golden-eyed]] SuperpoweredEvilSide when his ThouShaltNotKill vow begins to waver.
* The goals of ''Manga/ShamanKing'''s X-Laws are fundamentally good: stop [[BigBad Hao]] from taking control of the world. However, when they start beating up and killing people just because they were allied to, or were about to side with, Hao, they kind of stop looking heroic. Their leader, Jeanne, may seem like a NiceGirl, but is just as much of a Knight Templar as her followers; she is willing to [[ColdBloodedTorture torture to death anyone]] who [[IDidWhatIHadToDo opposes her, believing that it's what she has to do]].
** Ironically, their target, Hao, could be considered this too. He wants to kill all normal humans in the world so that only Shamans remain, since supposedly only good people can see ghosts. He's also completely willing to kill other Shamans who get in his way.
* ''Anime/TengenToppaGurrenLagann'''s main antagonists are mostly this trope.
** Some fans view the Anti-Spirals as being thoroughly evil examples of the KnightTemplar, due to their repeated crossings of the MoralEventHorizon. First, they [[MindRape turned]] Lordgenome to their side against his will, making him massacre his own people. Second, they turned [[TheCutie Nia]] into their slave, and then [[ColdBloodedTorture tortured]] her, ripping her apart from the inside. Finally, the reason they tortured her? They were sick of merely oppressing Spiral races, and wanted to KillEmAll. Oh, and in TheMovie, the torture/interrogation scene? It involved Naughty Tentacles.
** [[spoiler:Lordgenome]] claims that he [[spoiler:forced humanity underground and killed all who came to the surface in order to keep the Anti-Spirals away from his planet]].
* In ''Anime/TigerAndBunny'', Lunatic is a NEXT who possesses pyrokinetic abilities that rival even that of Hero TV's Fire Emblem, and who has made it his personal mission to judge and execute criminals who would otherwise escape justice.
* ''Manga/TokyoGhoul'': The [[HunterOfMonsters CCG]] is entirely dedicated to the cause of wiping out the entire Ghoul race, even peaceful ones who don't actually hurt anyone. Humans who sympathize with or aid Ghouls are shown no mercy.
* ''LightNovel/TrinityBlood'' has quite a few bloodthirsty crusaders for justice -- notable among them is Brother Petros, [[AuthorityEqualsAsskicking director]] of the [[ChurchMilitant Department of Inquisition]], who can favorably be described as "zealous though unsubtle" and accurately described as a bloody lunatic.
** Petros is really more of a JerkWithAHeartofGold, willing to listen to reason, and outright defies orders from his superior (who is a flatout KnightTemplar) in order to rescue the pope instead of letting him get martyred.
*** An early episode also subverts this when Brother Tres Iqus, GunKata badass ''extraordinaire'', declares his intent to kill an innocent child simply because he has been ordered to by his superiors, but runs out of bullets. Moments later, he empties his weapon into an attacker and walks away (revealing that he does not mindlessly follow orders from the "good guys"), which is saying something because Tres ''[[ArtificialHuman is an android]]''.
* When one of these is made King of Hou in ''Anime/TheTwelveKingdoms'', his kingdom apparently starts well, but very soon, [[FromBadToWorse it gets worse]] as [[JadeColoredGlasses his absolute sense of justice and human nature]] poisons his common sense and people are executed by the bazillion under his orders. [[spoiler: That is, until the minor noblemen and government officers get fed up with the bloodbath [[OffWithHisHead and behead him, his wife, and their kirin]] [[KarmicDeath as punishment]].]]
* ''Anime/WeddingPeach'': Scarlet/Salvia believed that reforming devils was stupid and kills even the harmless ones. [[spoiler:Subverted as it's discovered that a devil killed her best friend- ''after'' she showed it mercy, [[MyGreatestFailure which totally broke her]]. She mellows out though]].
* The SOLOMON organization in ''Anime/WitchHunterRobin'' has strong ties to the Roman Catholic Church, particularly the Congregation for the Doctrine of the Faith...better known by its truncated historical title of the Inquisition.
* ''Anime/YuGiOh'' has Dartz and his organization, Doma, which wants to destroy the world in order to save it.
** Yami Yugi was also an intense KnightTemplar in the early manga, driving people insane and directly setting five people on fire in order to protect Yugi. Many of his punishments took place through penalty games, but still, many of them are DisproportionateRetribution. When Yugi becomes fully aware of his presence after Yami Yugi is prepared to kill Kaiba to win, Yami tones WAY down, only approaching his old levels in Season 4 of the anime-only Doma arc when he (temporarily) [[MyGodWhatHaveIDone loses Yugi's soul to the Orichalcos seal he used]].
** ''Anime/YuGiOhGX'' has the Society of Light, headed by a vague alien {{Energy Being|s}} called "The Light of Ruin".
** ''Anime/YuGiOh5Ds'' makes a full set with the Yliaster Trio, [[spoiler:Aporia and Zone]], who have come back from the future where Momentum has destroyed the world for the purpose of saving it. They have the power to erase and rewrite history, slaughtering people behind the scenes without most people being aware of what's happening. Then we have the Ark Cradle, [[spoiler: which has a negative spin, cutting all power to Neo-Domino and coming down to wipe out not only the City, the heart of Momentum, but everything in a radius of 30 miles]]. Paradox himself comes from the same future in TheMovie, with the same beliefs.
* Sensui of ''Manga/YuYuHakusho'' was a particularly brutal Knight Templar before the start of the series, believing that all demons were irredeemably evil and all humans were good, killing all demons indiscriminately. When he was given overwhelming proof that his convictions were wrong, he went [[FreakOut completely]] [[FaceHeelTurn insane]] and tried to overrun the world with demons, [[NietzscheWannabe believing all humans to be corrupt]].