* [[AncientConspiracy The Circles]] from the ''FanFic/DevaSeries''. They firmly believe that artificial magery will lead to TheEndOfTheWorldAsWeKnowIt and seek to kill Hayate and friends for using Devices. Admittedly, there is a smidge of truth in their beliefs, but the extents to which they go, combined with their insistence on refusing Hayate's offers, do not help their case.
* ''FanFic/RosarioVampireBrightestDarkness'':
** Hokuto Kaneshiro. He commits all manner of horrible atrocities purely for the endgame of resurrecting [[EldritchAbomination Alucard]] and watching his destroy all life on Earth, simply because [[PutThemAllOutOfMyMisery he believes that all life is evil, meaningless trash]], and repeatedly declares that all of his actions are for a higher cause.
** Talon Ryashen, the "Fairy Tale killer." He was turned into a SuperSoldier by Fairy Tale, and is now on a RoaringRampageOfRevenge against ''anyone'' who was ever a part of the organization. It doesn't matter if said members defected, were LockedOutOfTheLoop, or non-combatants; if they were even remotely a part of Fairy Tale, they're on his hit list. Case in point: despite knowing that Dark left Fairy Tale a long time ago and is one of the heroes who slew Alucard, Talon flat-out states that he doesn't care; all that matters is that Dark ''was'' a member of Fairy Tale, and thus is irredeemably evil in his eyes.
** Fairy Tale themselves. For all of their claims on monster equality, they're more focused on anti-human extremism to the point that any monster who even ''thinks'' of siding with humanity is automatically the enemy; they have personally destroyed Ahakon's [[DoomedHometown hometown]] for refusing to side with them, and tried to do the same to Mizore's hometown twice, on top of attempting to destroy Yokai Academy for teaching coexistence. In fact, in Act VI chapter 52, after seeing Moka preach human/monster coexistence on national television, both Gairen and Raika openly state that they're beginning to see why Gyokuro hates Moka so much.
** The [=HDA=] is this throughout Act V and most of Act VI, given their AggressiveCategorism of all monsters as evil beasts. In Act V chapter 23, Marin explicitly describes their treatment of monsters as inhuman, and in Act VI chapter 25, Moka outright declares them to be nothing but a barrier in any efforts to attempt peace between humans and monsters, since they, in her words, "treat all monsters as [[AlwaysChaoticEvil absolute evils]] regardless of their nature." As of the end of Act VI, they've finally grown out of this, in part due to a ReasonableAuthorityFigure in their new director, Hothorne Tamaka.
* Subverted in the ''Franchise/SonicTheHedgehog'' and ''Anime/SailorMoon'' crossover ''[[http://www.fanfiction.net/s/4167708/1/Chaos_Infinity Chaos Infinity]]''. [[TheChessmaster Chessmaster]]/MadScientist Dr. Eggman manipulates the Sailor Scouts into thinking that Sonic and his friends are the ones responsible for the crisis in Tokyo and pushes them to [[LetsYouAndHimFight fight each other]], thinking that the Scouts are too much for his archenemies to handle. His plan fails when Sonic gathers enough HeroicResolve to pull out his [[spoiler: own Chaos Blast]] to overpower their rivals and calls out BOTH the [[WhatTheHellHero Sailor Scouts]] and the [[WhatTheHellTownspeople people of Tokyo]] for their mistreatment. And then Eggman nearly kills Sailor Moon when using her and the Master Emerald as batteries for another one of his war machines to take out Sonic for good and everyone knew from then on who was really friend and foe. Again, it backfires. After stopping his final weapon, the Sailor Scouts and the [[RagtagBunchOfMisfits Freedom Fighters]] become friends.
* In ''[[FanFic/SovereignGFCOrigins Origins]]'', a ''MassEffect''[=/=]''StarWars''[[spoiler:[=/=]''[=Borderlands=]''[=/=]''[=Halo=]'']] MassiveMultiplayerCrossover, Sarah [[spoiler:a Force-sensitive Siren]] is ''absolutely convinced'' she's doing the right thing to stop a devastating AlienInvasion...by [[KillEmAll killing anyone in her way]]. This is also enforced by her creators' belief they just did a bit of BrainwashingForTheGreaterGood by erasing her belief that ''they'' were breaking the very rule her present killing is supposed to be enforcing ([[{{Irony}} protecting sapient life]]).
* In the ''Franchise/SonicTheHedgehog'' fanfic Fanfic/PrisonIslandBreak, Silver is the nicer kind of Knight. However he is always convinced that he is morally in the right, despite also being a murderer. His greatest fear is becoming his father.
* In the ''Fanfic/PonyPOVSeries'', one of the {{Alternate Universe}}s that Applejack sees at one point is a world were the Mane Cast have become a group of dictators who brainwash and otherwise brutally suppress anything "disharmonic". They are actually based off of the Justice Lords from the ''WesternAnimation/JusticeLeague'' series.
* In the Fanfic/SpyroMadnessSaga, we have Ember's father. He [[MoralEventHorizon murdered his mate]] after learning she was [[OmnicidalManiac Malefor's]] granddaughter, which would make Ember his great granddaughter. He then abandoned Ember's egg in a swamp. [[FromBadToWorse It only gets worse]] when [[spoiler: after Ember lays an egg fathered by Spyro, he kidnaps her and fools everyone into believing she's dead. He spends the next few months [[ColdBloodedTorture torturing]] ''his own daughter!'' When Ember's discovered [[TearJerker she's badly scarred and missing a horn.]]]] And all of this was just because [[HeWhoFightsMonsters he was paranoid and believed she was a demon.]] Ember then [[CrowningMomentOfAwesome shows just how wrong he was]] by [[spoiler: [[CruelMercy sparing his life and allowing the police to deal with him]] proving she's not a [[YouMonster monster like him]].]] By the way, it's [[spoiler: Terrador]].
* Subverted in ''[[FanFic/CheerileesGarden Cheerilee's Garden]]''. Cheerilee justifies her [[TorturePorn many brutal murders]] by claiming that she's doing the world a favor by ridding it of degenerates and corrupting influences ("weeds"), but just in case the reader wasn't already tipped off by her obvious eagerness and pleasure in committing such acts, Twilight flat-out states in the third chapter that Cheerilee is nothing more than a [[ForTheEvulz Hedonistic]] SerialKiller.
* In the ''WesternAnimation/{{Daria}}'' multiversal {{Crossover}} ''Worldburner'', the ''Warhammers'' (the military-tasked arm of the [[BadassArmy Corps of Ringbearers]] who are serving as the front-line forces in the war against the JokerImmunity-blessed BigBad [[GodModeSue Judith]]) definitely fit this trope. In order to defeat Judith, they decide that no rules apply anymore and do things such as arm anyone who asks with 'bleeding edge' weapons, [[EarthShatteringKaboom destroy whole planets]] [[ApocalypseHow and solar systems]], and [[BullyingADragon even standing up to an agency tasked with policing time]]. Unfortunately, they end up mostly dying because they run afoul of TheOnlyOneAllowedToDefeatYou territory, and don't want to wait for TheChosenOne to arrive. The really sad part is that FridgeLogic (and an AlternateCharacterInterpretation) suggests that they're actually correct, in that they saved untold lives by distracting Judith (and her forces) long enough for [[TheChosenOne the Worldhopper]] to arise and defeat her.
* In ''[[http://www.fanfiction.net/s/3557725/1/Forging_the_Sword Forging The Sword]]'' Harry wonders why no one makes all wizards take an unbreakable vow to never hurt anyone. [[ValuesDissonance This leads to quite a spectacular argument with Ron]] on how he can even ''suggest'' such a thing.
* The [[LightIsNotGood Law Heroine]] in FanFic/GoddessRebornChronicle, whose soul was bonded to an angel-until she finds herself better treated by enemies than allies, questioning her own faith and motivations.
* In ''VideoGame/{{Touhou}}'' canon, Yukari Yakumo is usually portrayed as the overseer of Gensokyo, when working being a TricksterMentor to Reimu and tending the Hakurei Border. However, when the fic oges DarkerAndEdgier, Yukari will usually be a ruthless knight templar, that measures no consequences in order to keep the barrier up and Gensokyo safe. This goes from hunting Rin, provoking a small war with Yuuka and [[spoiler:nearly [[YouHaveFailedMe executing Remilia for her failure]]]] in ''FanFic/ImperfectMetamorphosis'' or [[spoiler:spiriting away selfish kids to destroy the balance of Gensokyo in order to keep the place busy and prolong its lifespan]] in ''WebAnimation/DiamondInTheRoughTouhou''.
* This is Danzo's portrayal in ''{{FanFic/Vapors}}''. He is a cruel and ruthless monster, but he's a cruel and ruthless monster ''for the betterment of Konoha'', and even Aiko, who despises him, agrees with some of his ideas. When he is waiting to be executed for treason by his own home, he refuses to let a Root operative spirit him o safety, instead only asking that the explosive seal on his chest be defused before he dies, so that Konoha won't suffer any collateral damage.
* A common trope in ''FanFic/SonicXDarkChaos'', particularly among the Angels and the more-fanatical Demons. The Muslims and the Emirate of Mecca take this trope UpToEleven. [[spoiler: Cosmo's mother Hertia]] also eventually became this, [[spoiler: torturing Tsali's sister and killing a recently born Seedrian male child because of Daffodil's religious influence]].

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