History Main / SuperpoweredEvilSide

* In the ''Franchise/StarWars'' franchise, it's possible for a Jedi to temporarily become stronger by tapping into TheDarkSide, but with the [[PowerAtAPrice consequence]] that it can become permanent. It's also not guaranteed to work since it can backfire and lead to their making stupid mistakes due to being DrunkOnTheDarkSide.
** For example, this is how Luke Skywalker defeats Darth Vader in ''Film/ReturnOfTheJedi'' after being provoked into an UnstoppableRage by Vader's use of the RelativeButton. Palpatine even says it: "Your hate has made you powerful." Luke refuses to kill Vader after defeating him, though he comes very close, and if he had that would have led to [[IfYouKillHimYouWillBeJustLikeHim becoming the new Vader]].
** Per WordOfGod, this is also how his father Anakin defeats MasterSwordsman Count Dooku in ''Film/RevengeOfTheSith'' ... but it has the cost of causing him to edge closer to TheDarkSide. Unlike his son, he gives into his anger and kills Dooku, leading to his fall to the Dark Side later on. And despite believing himself to be more powerful because of this, it leads to him trying a reckless maneuver during his fight with Obi-Wan Kenobi that results in some horrific injuries (which are the reason he needs to wear the black suit in the original trilogy).
*** Throughout Anakin’s life it is highly implied that due to his unique birth, Anakin literally has a split personality with Vader being the Dark side and Anakin being the Light side.

** When Willow [[BreakTheCutie is pushed to the snapping point]], she unleashes a Super-Powered Evil Side [[WoobieDestroyerOfWorlds in a ''bad'' way]], replete with utterly delightful badass one-liners. [[PunctuatedForEmphasis "I. OWE. YOU. PAIN."]]

** Played with for a bit in his own series where he becomes a SED KnightTemplar version of himself: as Angelus, he'll gloat and joke and dream up sadism. As a frightening mix of the two, Angel is basically the most vicious vampire in history, on our side.

** When Willow [[BreakTheCutie is pushed to the snapping point]], she unleashes a Super-Powered Evil Side [[WoobieDestroyerOfWorlds in a ''bad'' way]], replete with utterly delightful badass one-liners. [[PunctuatedForEmphasis I. OWE. YOU. PAIN.]]

** Subverted. Stefan Salvatore is a great example of this when he becomes the Jekyll&Hyde Ripper.
** Elena Gilbert's non-humanity side is also subverted. Not necessarily different in physical strength, but also much more cold, arrogant, ruthless, and even calculating that the Salvatore brothers have to keep a sharp eye on her. They did their best trying to bring her back to her old self again. She also happens to be extremely fearless when she's in this phase.
** Even Caroline Forbes's is a pretty straight example. She was even more capable of putting her brute strength and compelling abilities to use without hesitation, especially when she forced Stefan to turn his humanity off to save his niece.

** As time goes on, Willow seems to have her Super-Powered Evil Side under control. It's more that she turns evil when she uses powerful magic, but then she turns back good when she stops. A scene in Season 7 demonstrates this effectively: while using a powerful barrier spell to protect an innocent girl from a spider demon, Willow gets the black eyes and black hair, and also calls the girl a bitch. After the demon leaves, she goes back to normal and apologizes to the girl.

-->'''Templar!Trace:''' ... they should have a festival for me... These Keidran don't deserve anything.
-->'''Dark!Trace:''' Are you the one hurting Flora? No matter... I'll just kill you all and sort it out later.
* In ''Webcomic/RiseOfTheHeroes'' Andrew LaCondore slips into a twisted version of himself after submerging and drowning at sea. It is referred to as an 'Overlord' form by Cate. Needless to say, it comes with a crazy amount of strength and the ability to manipulate dark flames.

** Vessel talents' powers are connected to various Ancient Ones (usually coming from the works of one Creator/HPLovecraft), and there is generally a decent chance of them taking over. Even on its own, that's pretty insane, as ''they'' can use the CastFromSanity magic granted to their vessels ''for free'', but this could eventually lead to the Ancient One in question fully manifesting their power in the mortal realm. Mind you, they're so strong that they snack on lesser deities ''just because''.

* Played straight in ''Fanfic/AhArchfall''. Even before he had his Archs, Jago was a competent fighter but when things got rough, he could us his dark power side, known as "Papa Jupiter". At his most basic level, Jupiter can boost Jago's fighting power to the point where he can plaster ten grown men. At the full extent of his powers, he is AT LEAST as powerful as either the Almighty One or Lady Hild (possibly more so). Unfortunately at this level of power, he has no problem with killing people, even those he cares about (though he prefers enemies as they tend to fight back). [[spoiler:As the story progresses, its revealed that Jupiter taking over is the only thing that Jago is REALLY afraid of. This is brought to a head during the Deity Games when he faces a mirror that reflects a person's worst fears as sees the result of what a fully unleashed Jupiter can do; he devastates the world, crucifies Lamb and Damascus, beats Lind to death with a rock and uses his knife to murder their infant son. The physic torment this causes is so great that it actually makes the mirror shatter.]]

* In ''Fanfic/ChildOfTheStorm'', Harry has a dark side that starts appearing after Chapter 50. While not strictly another personality, it's certainly another side of him. According to Carol (who's had a look inside his mind), like all the experiences that should have screwed him up have been locked away in a box in his mind, constituting his dark side. It's [[TranquilFury frighteningly cold]], ruthlessly calculating, and while not explicitly more powerful, Carol describes it as TheUnfettered, while others describe it as being frighteningly reminiscent of a young Magneto. In one early appearance, it resulted in Harry putting an entire HYDRA assault team at his mercy and nearly forcing a PsychicAssistedSuicide after their leader took a child hostage, only being talked down by Jane. Then, a chapter later, it led to him telekinetically ripping Gravemoss' ribcage open and tearing his heart out (not that it had [[HealingFactor any long term effect]]). Unsurprisingly, [[BestFriend Carol]] [[MoralityChain keeps a close watch on him]], as Harry does on himself, being invariably horrified by what he's done when it sinks in.
** Towards the end of the first book, Harry's protection is revealed as a fragment of the Phoenix Force, and the start of ''Ghosts of the Past'' shows that he can tap into it. Considering the already mentioned dark side and that the Phoenix has taken him over to protect him, appearing in the gear of the Dark Phoenix and destroying everything in its way, this is rather worrying -- while the Phoenix is broadly benevolent or at least, [[spoiler: Lily, the White Phoenix of the Crown,]] is, the power itself is a) morally neutral, b) incredibly volatile. As a result, Loki's fear is that that the two will combine and turn him into the Dark Phoenix. [[spoiler: This fear turns out to be entirely justified.]]

** Touma's ten years of torture and experimentation before being rescued left him with a cold blooded alter ego called, [[TheDreaded ''The Ghost'']]. It isn't evil, but it has no moral inhibition, wiling to do whatever it takes to protect those he cares for.

* Taiga has a variation in ''[[https://www.fanfiction.net/s/11905736/1/Fate-Gamer-Night-SE Fate Game Night]]'' when she wields her shinnai, which she's stored all her negative emotions in (particularly hatred and anger), turning it into a pseudo cursed sword. Though it's main weakness is that while she does become far stronger, the shinnai contains only a finite amount of power; once her hatred runs out, she turns back.

* In ''Fanfic/{{Heir}}'' by Na'hiel "Tom" [[spoiler: [[Franchise/HarryPotter the horcrux Voldemort]] accidentally made that resides in Harry's scar which has became sentient [[LimaSyndrome and very protective of his host]]]] is this for [[TheKidWithTheLeash Harry]].

* The plot of ''Fanfic/ThePowerOfTheEquinox'' begins when Twilight Sparkle, trapped in the crystal caves beneath Canterlot, accidentally [[SealedEvilInACan releases]] from a black crystal [[TheHeartless the Entity]]. After it [[EnemyWithin takes root in her body]], she transforms into a darker and carnivorous mare who has new powers, like a powerful {{healing factor}} and phasing abilities, and she can create appendages and weapons from the black substance that's attached to her. Making a point of no longer being Twilight Sparkle, she renames herself as Dimmed Star. However, while [[TookALevelInJerkass more aggressive and aloof than before]], she still cares about her loved ones to varying extend, and the worst things she does are done when the Entity [[DemonicPossession takes control over her mind]]. Rainbow Dash lampshades this trope to Spike by saying that Twilight has "pulled a Nightmare Moon".

* Dark Cupid gets more than he bargained for in ''Fanfic/SpellboundLilafly'' when he hits Chat Noir with one of his MindControl arrows. Since Adrien is half-fae, and his fae side is resistant to magic, the arrow merely suppresses his human side -- the side that has recognisable morality and compassion and other such niceties like restraint. He proceeds to enjoy beating Dark Cupid to a pulp, and would have outright killed him if Ladybug hadn't intervened.
--> '''Faedrien''': Y''o''u ''ſ''h''o''u''l''d''n''’t ''h''a''v''e ''d''o''n''e ''t''h''i''s.

* ''Fanfic/Zero2ARevision'' has the Digimon emperor being presented as Ken's dark side whenever he shows up as a result of Demon's Dark Spores. Later, in an attempt to stall the prevent the Digidestined from entering the real world and destroy his entire army [[spoiler: and to keep the Digidestined from evolving their Digimons so that he will remain at full power to combat [[EvilVersusEvil Demon]]]], Umbradevimon decides to corrupt Davis, using his own jealousy and hatred for TK against him with the help of the Touch of Evil as well as 15 black gears to create Darkheart, Davis's own evil self. Darkheart at first starts out as an obedient automaton whose only purpose is to keep the Digidestined on their toes under Umbradevimon's instructions. [[FromBadToWorse Unfortunately just as the Digidestined decides to enter the real world and leave some behind to stall him]], Demon inserts a Dark Spore to him which gives him a free will and becomes a sadistic psychopath hellbent on absorbing the Digidestined [[ForTheEvulz just because he can do it]] and [[CardCarryingVillain to become the greatest villain of all time]]. Umbradevimon's plan unintentionally [[GoneHorriblyRight works a bit too well]] as Darkheart [[KnightOfCerebus single-handedly managed to create the]] DarkestHour for the entire Digidestined a long time (13 chapters to be exact) before he finally gets taken down.

* In ''WesternAnimation/TheIronGiant'' the giant is pretty powerful on his own, but friendly. You do ''NOT'' want to push his BerserkButton however.

* In ''Film/ForbiddenPlanet,'' the ancient alien civilization made a giant machine which is capable of turning thoughts into reality. It turns out that the machine works even better with subconscious thoughts.

* The premise of the movie ''Film/{{Split}}'' is a man with 23 personalities kidnaps three women to sacrifice them to a Super Powered new personality called The Beast when it emerges. Most of his personalities are decent people, and he is horrified by what he has done when his original personality briefly gets control again. The explanation given for how The Beast has super powers is the idea that a person with Dissociative Identity Disorder can change their bodies based on their beliefs although [[spoiler: the TwistEnding of the movie reveals that it takes place in the same universe as ''Film/{{Unbreakable}}'' where super heroes and villains do exist.]]
* In the ''Franchise/StarWars'' franchise, it's possible for a Jedi to temporarily become stronger by tapping into TheDarkSide, but with the [[PowerAtAPrice consequence]] that it can become permanent. It's also not guaranteed to work, since it can backfire and lead to their making stupid mistakes due to being DrunkOnTheDarkSide.

** ''Film/TheLeagueOfExtraordinaryGentlemen'': Hyde is essentially the Hulk, superpowered brute who is hard to control but ultimately not ''evil''.

* ''Film/{{Upgrade}}'': STEM has far less qualms about killing people than Grey does, and it certainly can move Grey's body in ways that Grey, or most humans even with extensive training, can. [[spoiler:It also turns out being an EnemyWithin]].

* Rachel from ''Literature/{{Animorphs}}'' has ''two'' examples: in ''The Separation'' a freak accident with a starfish morph splits her into two Rachels, a 'Nice Rachel' that's timid, ditzy and strategic, and 'Mean Rachel' who gets all of Rachel's BloodKnight instincts but none of her restraint. Later in ''The Return'' Crayak tempts Rachel with godlike power, transforming her into a steel-clawed, indestructible killing machine dubbed 'Super Rachel'.

* [[spoiler:Beranabus]], in Darren Shan's [[Literature/TheDemonata Demonata]] series. [[spoiler:As a result of being half demon, he was able to turn into one. He does this only once, because he's afraid that this ability is one of these, in order to fight [[CosmicHorror Death]]. He succeeds in his goal of sending it back into the demonata's universe, but dies in the process.]].

* In the ''Literature/DreambloodDuology'', Gatherers are well trained and educated priest capable of killing people in their dreams and making them enjoy it. [[OurVampiresAreDifferent Reapers]] are Gatherers who have lost control and become addicted to the [[FantasticDrug dreamblood]] they collect as their job. Those are capable of killing hundreds or thousands of people at the same time just to get their desired dreamblood.

* ''Literature/EgilsSaga'': When Egil's father Skallagrim is in a fit of 'shape-strength', he is even stronger than usual but also an incontrollable madman who kills indiscriminately. When Egil is twelve and playing at a ball-game against his father and it looks like Skallagrim is going to lose, he suddenly becomes 'shape-strong' and kills Egil's best friend Thord, his nanny Thorgerd, and very nearly Egil himself.

** Lord Vile [[spoiler: was created when Skulduggery first came back to life and fell into despair over the death of his wife and child. Being undead]] unlocked and enhanced his latent potential for Necromancy, and he became little more than a killing machine serving under Mevolent as that gave him the most options to kill people - [[NotInThisForYourRevolution he didn't care about bringing back the Faceless Ones]] beyond getting the chance to kill a god (which he was entirely capable of). Of all the Three Generals, he was the most feared, and causes an even bigger OhCrap reaction than Mevolent himself, and the plan when fighting him was 'get an army, attack together, hope someone gets lucky'. He eventually came to realize the monster he'd become and hid away Lord Vile's Necromancy-infused armour for centuries. Unfortunately, [[spoiler: being trapped alone in the Faceless Ones' realm for a year]] weakens his resolve to keep Lord Vile locked away, and his subconscious started to reanimate it. He made his long-anticipated return by casually slaughtering a previously unstoppable Russian assassin who'd beaten Skulduggery, Valkyrie, Tanith, and Ghastly just because they were between him and his target, then beat Skulduggery to a pulp, before vanishing after informing him that he was back to find and kill the Necromancers' new Death Bringer. When said Death Bringer, a necromancer altered into a HumanoidAbomination capable of killing millions and who just absorbed the lives of several hundred powerful sorcerers, faces him, she can beat the armour. But when [[spoiler: Skulduggery]] reclaims it, it's all Valkyrie can do to prevent him from killing them both in seconds, and the only person who can fight him evenly is ''Darquesse''. Oh, and his ultimate goal is [[OmnicidalManiac to kill everything]].

* Philuffy in ''Literature/UndefeatedBahamutChronicle'' has her Abyss state, which greatly increases her strength, regeneration and even mental capabilities. This is due to being implanted with tissue from the PuppeteerParasite Yggdrasil, so when she first used this power it rendered her susceptible to its control. After Yggdrasil's death, this is no longer a risk. The state isn't inherently evil, but it does make her susceptible to control by horn flutes (a type of artifact that can control Abyss).

** The Radical has the combined powers of all other alter-egos of Captain' Trips, thus making one of the most powerful aces. He's also, depending on where you stand, a WellIntentionedExtremist or a full-blown villain. Obviously he won't let Trips take back the control of his body.

* In ''Literature/WingsOfFire'', [[TheBigGuy Clay]] thinks he has a suppressed bloodlust in him due to having attacked the other dragonets at their hatching, causing the dragons raising them to think he's a monster. [[spoiler:It turns out to be subverted, when it's revealed that Clay's "attack" was BigBrotherInstinct, helping the others hatch.]]

*** Samantha Arias is an average single mother who eventually discovers she has Kryptonian powers, but can't activate them at will, only during stressful situations. Her cold and ruthless "Reign, the Worldkiller" persona has full control over her powers, and is even more powerful than Supergirl. [[spoiler:In their first fight, she beats up Supergirl so badly she is broken and bleeding and needs to be hospitalized, while Reign doesn't have a scratch on her despite taking several hits. Eventually, Samantha manages to destroy her Reign personality, but this causes her to lose her powers, basically leaving her an ordinary human.]]

** Played with for a bit in his own series where he becomes a SED KnightTemplar version of himself: as Angelus he'll gloat and joke and dream up sadism. As a frightening mix of the two Angel is basically the most vicious vampire in history, on our side.

** As time goes on, Willow seems to have her Super-Powered Evil Side under control. It's more that she turns evil when she uses powerful magic, but then she turns back good when she stops. A scene in Season 7 demonstrates this effectively: while using a powerful barrier spell to protect an innocent girl from a spider demon, Willow gets the black eyes and black hair, and also calls the girl a bitch. After the demon leaves, she goes back to normal, and apologizes to the girl.

** This was played with in another episode, wherein David discovered that a small-town scientist had succeeded in creating a hulk-like creature decades ago. Reading through the scientists' notes in hope of getting insight into a cure for his own condition (while being assisted by the now-elderly lab assistant who had originally transformed many years ago), David reads a observation by the scientist that the creature is murderous and cruel, and notes that he believes it is due to the inherent personality of the human subject. Cue an OhCrap by David as he realizes there's a secret reason why the lab assistant is being so helpful in trying to recreate the process that made him into a Hulk. The early Hulk wasn't an evil side, it was just the ''already'' evil personality of the lab assistant with the strength to do as it pleased.

*** The ''Series/KamenRiderDecade'' version of Kuuga also possesses this form but [[spoiler: unlike the original, he remains the evil 'Black Eyed' version his entire run in this form]]. Taken further when he gains Rising Ultimate form which [[spoiler: first used as a mindcontrolled [[TheDragon Dragon]] by the BigBad]].

** ''Series/KamenRiderBlade'': The [[CreepyCockroach Joker]] [[TheNeedless Undead]] is a feral WildCard that can only [[AttackAttackAttack fight]] and [[ApocalypseHow destroy]]. Thanks to the Mantis and Human Undead, it had developed an identity as [[spoiler: Hajime Aikawa]], who supressed any notion of his true nature out of fear.

** ''Series/KamenRiderOOO'': [=PuToTyra=] combo can easily deal even with [[OneWingedAngel complete Greeed]] and also is the only combo capable of destroying the regular medals. Unfortunately, the forbidden medals can move on their own and take control of Eiji, turning him into snarling, animalistic berserk.
** One of the means of making [[WarIsHell war hell]] in ''Series/KamenRiderBuild''. The Hazard forms are capable of steamrolling anything bellow [[PlanetEater Evol]] [[ArtifactOfDoom Driver]] and are a solid competition even to it. They are not a triumph card, but a GodzillaThreshold as the raw power unleashed overloads the user's brain and shuts down their conscious mind, all in matter of minutes. What's left is no more than an silent, precise AttackAnimal [[AttackAttackAttack destroying]] everything in sight. The [[PreventTheWar first time]] Sento used it [[WarIsHell traumatized]] everyone there to see it and [[EmptyShell shattered]] his [[TheseHandsHaveKilled already]] [[NervousWreck fragile]] mental state.

* Sam Winchester, ''Series/{{Supernatural}}''. When he taps into the demonic "special child" aspect, he is extremely powerful (telekinesis, exorcism, torturing/killing of demons, immunity to attacks by demons) but loses all his humanity and morality and becomes arrogant, violent and cold. His eyes turn yellow or black on a couple of occasions.
** And Dean Winchester, in a way. In Season 10, [[spoiler:The Mark Of Cain turns its bearer into a heartless evil murderer who loves brutally killing everyone, and has the potential to turn them into a demon]], and demons tend to have super-strength. In the past, Dean would punch an angel and doing it is like punching an iron wall; Painful. In Season 10, [[spoiler:the Mark turned Dean into a demon, he was cured and turned back into his human-self, but the Mark still affected him and slowly turned him into this cold-blooded killer. It also enhanced his raw physical strength because he managed to beat the crap out Castiel; an angel he already punched before, but it didn't even left a mark and he nearly broke his hand hitting him. Yet Dean was able to beat the same angel into a bloody mess and leave him laying on the floor with probably a broken nose. Now, granted Castiel wasn't at full strength at the time, but Dean also punched Cupid once and almost broke his fist, and surely Castiel would still remain stronger than a low-ranking Cupid, even when he's half-de-powered... right?]]

** ''Beast Morphers'' also gives this to the Red Ranger with his Fury Mode upgrade, a set of armor with enhanced durability and WolverineClaws powered by an energy source stolen from the villains.

** Elena Gilbert's non-humanity side is also subverted. Not necessarily different in physical strength, but also much more cold, arrogant, ruthless, and even calculating that the Salvatore brothers have to keep a sharp eye one her. They did their best trying to bring her back to her old self again. She also happens to be extremely fearless when she's in this phase.
** Even Caroline Forbes's is a pretty straight example. She was even more capable of putting her brute strength and compelling abilities in use without hesitation, especially when she forced Stefan to turn his humanity off to save his niece.

* One possible interpretation of ''Animal I Have Become'' from Music/ThreeDaysGrace. Many AMV of this song in youtube subscribe to this interpretation.
* Skillet's songs "Monster" is usually seen as being about someone who has a dark side that's trying to get out, resulting in many an [=AMV=] using the song for someone with a SuperPoweredEvilSide. [[MisaimedFandom However, Frontman John Cooper has said the song is actually about "being weighed down by sin" and how the singer is trying to get right with God, but is constantly tempted to turn into even further sin]]. To their credit, the band is well-aware that some people take double meanings to their songs, but they've said that they're okay with that.

* Myth/EgyptianMythology: In the ''Book of the Heavenly Cow'', Ra sent Hathor -- the matriachal bovine goddess -- to punish a group of mortals who had conspired against him. Hathor transformed into the leonine war-goddess Sekhmet and decided to just [[OmnicidalManiac kill everything]] instead, and was only stopped and turned back into Hathor when Ra tricked her into getting drunk on beer dyed to look like blood.
* Kali is this to Durga/Parvati in Myth/HinduMythology. Durga in warrior mode could not defeat a demon who spawned new demons from each drop of blood that hit the ground, so she became Kali, who drank each drop before it could hit the ground, then killing the demon. But theeeen she went on a rampage that only stopped when she injured her husband, the shock turning her back to the gentle Parvati.

* This trope is a tradition in Japanese pro wrestling, where many wrestlers unveil an evil persona to face a special threat or to play mindgames with a rival, and sometimes get in storyline overcome by these personas and turn fully heel, because EvilIsNotAToy. Among them there are Keiji Muto's "Great Muta" and his many emulators, The Great Sasuke's "SASUKE", HardGay's "Super HG", [=BxB=] Hulk's "Killer Hulk", Gamma's "Gamma Daio", Kikutaro's red mask, and many others.

* Simon from ''Roleplay/DawnOfANewAgeOldportBlues'' has an evil split personality known as the Dark Dragon. While both of them are capable of manipulating plasma, Dark Dragon is capable of doing so to a much stronger degree than Simon, and also lacks the inhibitions that make Simon hesitant to use his power.

** The Solar Exalted might have this particular category nailed; one of their abilities -- Ascendant Battle Visage -- places them into a battle-trance that physically changes them to reflect their BattleAura, and grants them intense and brutal combative skill. Remaining in this state too long, however, sends them into an UnstoppableRage, at which point they become even deadlier, and fight until either they're dead or everything else that might be considered an enemy is dead.

** In ''TabletopGame/ChangelingTheDreaming'', changelings can get magic ("Glamour") from normal humans two ways -- the first is by inspiring them to do something incredible. The second is to "ravish" them -- make them feel despair. One example of this involved convincing a small child that the Fae in question had just ''murdered the Tooth Fairy''.
** ''TabletopGame/WraithTheOblivion'': Wraiths have got their Shadow, a second personality usually existing within the wraith trying to make them them give up their struggles and descend into nonexistence or permanently hand over control of their body. Depending on the Shadow, this might take many forms, some direct and some seemingly helping the wraith. The latter type often has ways to enhance the wraith's body when temporarily in control -- better attributes, more magic powers or even items appearing only during the Shadow's catharsis. Such wraiths then always have the ability to let their Shadows handle combats too tough for them, but are generally loathe to do so because there's no telling what else the Shadow might do while in control.

* And to round out Creator/WhiteWolf's systems: In ''TabletopGame/{{Scion}}'', the Scion Companion supplement adds the Tuatha Dé Danann to the playable pantheons. One of their pantheon specific abilities? The "Rí­astrad" mentioned in the above mythology entry.

* Many characters in the Franchise/{{Nasuverse}} have an "inversion impulse", the desire to go psycho and unleash the full power their bitchin' superpowers on the world in an orgy of murder, due to their monstrous bloodlines.
** The BigBad in the ''VisualNovel/{{Tsukihime}}'' fighting game ''VideoGame/MeltyBlood'' uses his powers to summon {{Doppelganger}}s of several characters superpowered evil sides, leading to characters fighting their dark halfs; probably the biggest example being Nanaya Shiki, the evil murderous side of Tohno Shiki from the original VN.

* Graveyard Greg of the ''Webcomic/GamingGuardians'' has two separate and unrelated evil sides. Not only is he a werewolf, with an animalistic but self-aware wolf personality, but he's also possessed by a voodoo spirit which can take control of him at times. Greg has retained control by pitting them against each other, until they decided to team up to suppress him, becoming a zombie wolfman which calls itself "Mange".

* In ''Webcomic/{{Jack|DavidHopkins}}'', the eponymous character, a personification of the sin of Wrath and the Grim Reaper, will occasionally enter a kind of "Wrath Mode". In this state, he will be overcome by his sin and gain a boost of power. He later [[spoiler:absorbs and seals the sin of Lust, who talks to him, hassles him and will sometimes help him in fights through his cloak.]]

* In ''Webcomic/{{Roommates}}'' Goblin King Jareth has one. Technically it's his original personality, but his love and gratitude for the girl he choose, the camaraderie he feels for his friends and his own desire to change makes him suppress it. Not that it helps much, even his "Good" side is an "easily entertained but frequently bored trickster" (great intentions but sucks in this whole good thing) the "Evil" one is an "amoral ruthless fae lord" (FourthWallObserver meets TheFatalist and his role in the story tends to be: Villain).

* Trace Legacy of ''Webcomic/TwoKinds'' has ''two'' of these. Whenever he gets extraordinarily pissed off, his memories of his old life cause a person shift (visually represented by his eyes and part of his hair turning red). However recent comics have seemed to show this side is merging with is current persona. (As the racist evil side is shown defending [[UsefulNotes/FurryFandom Keidran]], which is something only his normal persona would do.) On the other hand, utilizing BlackMagic results a different but even more psychotic personality (visually represented by his eyes and parts of his hair turning black). While Templar!Trace is a complete reversion to his old evil personality and goals, Dark!Trace retains all his current goals and desires... [[TheDarkSideWillMakeYouForget at least at first]].

* In the episode ''Never Fear'' of ''The New Batman Adventures'' (the one after ''WesternAnimation/BatmanTheAnimatedSeries''), Batman inhales an anti-fear toxin made by the Scarecrow. As a result, Batman has no fear. NONE. Bruce Wayne (in disguise) infiltrates some facility and is caught by the Scarecrow. Bruce awakens in a zoo, where the only exit is next to the crocodiles' cage. From a high hill, the Scarecrow confronts him. Bruce plays dumb, pretending to be a petty thief who was simply snooping around for loose cash. Scarecrow shoots him with a gas gun and then dares him to approach the crocodile cage. Bruce crosses over the cage without fear, and is tackled by the beasts. As he goes under, a red stain dots the water, and the Scarecrow leaves, satisfied. Suddenly, Bruce reemerges from the water, and as one crocodile's body floats up, he walks away looking unharmed. This later worsens as he loses his fear of ''killing''...

* Distinctly more of an Superpowered Id than Evil Side, but WesternAnimation/{{Freakazoid}} is like this to mild-mannered nerd Dexter Douglas.

* When audiences found ''WesternAnimation/InvaderZim'''s RobotBuddy GIR cute, the writers created an episode called "GIR Goes Crazy and Stuff", where Zim actually fixes him -- and he becomes suddenly destructive and hyper competent, determining the only way to conquer Earth is with Zim out of the picture...

* In ''WesternAnimation/KipoAndTheAgeOfWonderbeasts'', Kipo discovers that in moments of stress she grows fur and gains superhuman physical abilities. In Season 2, it's revealed that this is because she has the ability to turn into a [[MegaNeko Mega Jaguar]]. However, if she actually transforms, she risks losing her mind to the jaguar's instincts [[spoiler: like what happened when her mom turned into the Mega Monkey]].
* To a degree in ''WesternAnimation/MiraculousLadybug''', this is the state of nearly all the villains - beyond the primary villain, Hawkmoth. Hawkmoth recruits supervillains by creating evil alternate personalities of ordinary citizens - most of whom are part of the supporting, and occasionally even main cast - born from their negative emotions, who he then gives superpowers to. Since they're controlled by Hawkmoth they don't stay with the characters who turn into them, but otherwise fit the bill - including usually pursuing what their normal personality wants in maniacal ways.

** K.O. has one named T.K.O., who is a BloodKnight, and is also an EmoTeen parody who steals his mother's eyeshadow and was initially mistaken for an emo phase. He lapses into T.K.O. when he feels helpless or angry. [[spoiler:However, T.K.O. is an unusual example in that he's not strictly ''evil'' so much as he is rebellious, angry, and violent; on occasions when that violence is aimed in a reasonable and useful direction, he can be something approaching ''heroic''.]] K.O. and T.K.O. can interact with each other [[JourneyToTheCenterOfTheMind inside of their mind]].

** There's Raven's "Daddy Issues". Dr. Light should '''really''' have backed off like she warned him.

* Coop on ''WesternAnimation/YinYangYo''. In his regular form, he's weak and nerdy. However, when he's infused with [[BigBad The Night Master's]] power, he becomes a match for Yin and Yang. Later on, Yin also gets a evil side to her when some of the Night Master's power corrupts her.

[[folder:Video Games]]
* In ''Prince of Persia: The Two Thrones'', the Prince is partially infected with the Sands of Time, leading to the emergence of a Dark Prince persona. The Dark Prince has a unique power set that sets his gameplay apart from the regular prince.
[[/folder]]

*** The episode ''Exile'' deserves a special mention. It is a full episode of Clark doing everything ever linked to the word {{Superdickery}}, including but not limited to [[BankRobbery robbing banks]] ([[KickTheSonOfABitch beating up the would-be robbers on the way]]), [[KickTheMoralityPet roughing up Chloe]] after [[IKnowYoureInThereSomewhereFight she spent two months trying to convince him to go home]], making a [[DealWithTheDevil deal with a crime boss to break into a high-security vault]] and [[CallingTheOldManOut coming to actual blows with Jonathan]]. Oh, he [[ArsonMurderAndJaywalking stole and destroyed Chloe's class ring too]]. [[spoiler:He is actually affected by the red kryptonite in Chloe's ring, and breaking it finally frees him from his Super-Powered Evil Side.]]

Unfortunately, it's not exactly the hero anymore. He's got {{glowing eyes|OfDoom}}, some new FacialMarkings, [[CreepyMonotone a different way]] [[PowerEchoes of talking]], some [[EvilCostumeSwitch new threads]], and a lot less compunction about ripping someone in half. It's his Super-Powered Evil Side. Think of it as the EnemyWithin when it's not the enemy, or as [[JekyllAndHyde Jekyll and super-Hyde]].

* Many characters in the VisualNovel/{{Tsukihime}} have an "inversion impulse", the desire to go psycho and unleash the full power their bitchin' superpowers on the world in an orgy of murder, due to their monstrous bloodlines.

** In the Heaven's Feel route of ''VisualNovel/FateStayNight'', [[spoiler:Sakura Matou]] lets loose a Super-Powered Evil Side powerful enough to kill most of the other participants and create a Super-Powered Evil Side of [[spoiler:Saber]].

Keep in mind, of course, that once the Id is out of the subconscious it's not likely to want to go back in. Thus, the hero faces the very real [[SplitPersonalityTakeover threat]] of [[FreakOut not returning to normal]], each bout of AlternateIdentityAmnesia causing him to get [[AmnesiacDissonance more worried]] about the next. Generally speaking, though, he's usually safe unless he starts thinking EvilFeelsGood.

* Skillet's songs "Monster" is usually seen as being about someone who has a dark side that's trying to get out, resulting in many an [=AMV=] using the song for someone with a SuperPoweredEvilSide. {{MisaimedFandom However, Frontman John Cooper has said the song is actually about "being weighed down by sin" and how the singer is trying to get right with God, but is constantly tempted to turn into even further sin}}. To their credit, the band is well-aware that some people take double meanings to their songs, but they've said that they're okay with that.

* ''Fanfic/ShadowsOverMeridian'': Despite having performed a SplitPersonalityMerge with the Queen, Jade still somewhat has one of these -- when she enters the [[BloodKnight bloodlust]] that comes with her new Oni biology, signified by her eyes glowing brighter and fangs sprouting in her mouth, she slips into a mindset much more like purely the Queen.

* In the ''WesternAnimation/JackieChanAdventures'' fic ''Fanfic/QueenOfAllOni'', the re-emergence of Jade's Queen of the Shadowkhan persona and her StartOfDarkness that occurs because of it is what kicks off the entire plot.

* During Chapters 27 and 28 of ''Fanfic/BlazBlueAlternativeRemnant'', Ragna enters [[spoiler:what's basically his Unlimited Mode. He becomes far more powerful, to the point of being an unstoppable juggernaut, but he loses all sense of control and becomes an AxCrazy destroyer, laying waste to the Vale docks, slaughtering the White Fang, and almost killing his friends in the process]].

* ''Fanfic/DateAReLive'': This ''LightNovel/DateALive'' has both existing and new inverse forms.

* The anime movie ''Anime/{{Tekkonkinkreet}}'' has the main character Black get saved [[spoiler:from space aliens by his own Super-Powered Evil Side known as "The Minotaur" which then tries to completely overtake him and show him the true power "The Minotaur" can unleash.]]

* ''LightNovel/DateALive'' has Inverse Form, a state which Spirits enter if they pass the DespairEventHorizon. In Inverse Form, a Spirit is far more powerful and also lacks any sense of restraint. Their weapon, previously referred to as an "Angel", is replaced by a darker counterpart called a "Demon King". [[spoiler:Interestingly, it's later revealed that this is the true personality of Spirits.]]

* Philuffy in ''LightNovel/UndefeatedBahamutChronicle'' has her Abyss state, which greatly increases her strength, regeneration and even mental capabilities. This is due to being implanted with tissue from the PuppeteerParasite Yggdrasil, so when she first used this power it rendered her susceptible to its control. After Yggdrasil's death, this is no longer a risk. The state isn't inherently evil, but it does make her susceptible to control by horn flutes (a type of artifact that can control Abyss).

* In ''Literature/SkulduggeryPleasant'', Darquesse and Lord Vile are the superpowered evil sides of [[spoiler: Valkyrie Cain and Skulduggery Pleasant]], respectively. Darquesse is [[spoiler: Valkyrie's]] True Name, and using the incredible powers that come from knowing her True Name [[DrunkOnTheDarkSide enhances all of her negative personality traits]] and causes her to revel in death and destruction, seeing everyone else as ants to be crushed at her whim. Lord Vile [[spoiler: was created when Skulduggery first came back to life and fell into despair over the death of his wife and child. Being undead]] unlocked and enhanced his latent potential for Necromancy, and he became little more than a killing machine serving under Mevolent. He eventually came to realize the monster he'd become and hid away Lord Vile's Necromancy-infused armour, but [[spoiler: being trapped alone in the Faceless Ones' realm for a year]] weakens his resolve to keep Lord Vile locked away.

* Many characters in the Franchise/{{Nasuverse}} have an "inversion impulse", the desire to go psycho and unleash the full power their bitchin' superpowers on the world in an orgy of murder, due to their monstrous bloodlines.

* ''Webcomic/SweetHome'': Each infected person develops one of these. They serve as a means of determining exactly how those that were infected will end up mutating. Hyun's in particular is very eager to play mind games with him.

* In ''Literature/TheOtherKindOfRoommate'', Xander is very rightly this to Alex. On top of being ten times more of an aggressive and amoral personality, complete with every [[SirSwearsALot profanity known to man]], plus a few he strings together, he's the half with chock full of the enthusiasm needed to use their powers' [[KillEmAll final setting]].

* ''Machinima/RedVsBlue'': A fairly goofy example occurs in Episode 40: in order to fight off a horde of "noobs" in Battle Creek, Caboose gets in touch with his "angry side", which results in him gunning down the noobs while shouting bizarre threats like "I will eat your unhappiness!" and "Your toast has been burned, and no amount of scraping will remove the black parts!"