Superpowered Evil Side - Television Tropes & Idioms

Himura Kenshin from Rurouni Kenshin is a technical pacifist in battle, fights with a reverse-blade sword and vowed years ago to never kill again. But if things seem to be getting out of hand even for him to handle (usually when his friends are in danger), his fighting style and mindset slowly begin changing into the highly pragmatic and ruthless Battosai, the assassin he was ten years ago. He switches the extremely humble sessha for the brash ore, loses the de gozaru from his speech, his eyes turn gold and more slanted and he moves for the kill. In the anime, Battosai seems to be considered an actual personality Kenshin has learned to seal off by creating his rurouni persona - he has to literally punch himself in the face to push it back and revert back. In the manga, this gets lampshaded a bit when Kenshin remarks that his face muscles have cramped and he isn't able to end his permanent death glare.
Son Gohan of Dragonball Z during the Cell Games is easily the most chilling example in anime. It is more than a little disquieting to watch the kind-hearted and sensitive little boy we have come to care about turn into a gleefully cold-blooded sadist when he achieves the Messianic power of Super Saiyajin 2.
- The original Super Saiyajin mode was originally intended to be a Superpowered Evil Side, as when Son Goku is in this state, he cannot use the Spirit Bomb, which requires a pure heart to use, because the Super Saiyajin state fills his heart with rage.
- Vegeta seems to regain some of his old nastiness whenever he fights as a Super Saiyajin (against the androids first, then later against second-stage Cell). Even Son Goku loses his usually unbreakable self-control the first time he achieves Super Saiyajin while fighting Freeza, though he seems to partially regain it by the end of the battle.
- In addition to the above, it should be noted that when Son Goku and Son Gohan transform into Oozaru, they also become mindless beasts, while increasing massively in power. This has been used both to save Son Goku from the clutches of the Emperor Pilaf, and allowed Son Gohan to beat Vegeta after crushing him from having his tail cut off and losing the transformation.
Ichigo in Bleach is the embodiment of this trope. He becomes much stronger when his inner hollow is allowed to come out, or comes out on its own accord. The inner hollow is a completely different personality, behaving differently and mocking Ichigo about his weakness even as he attacks their common enemy. Ichigo gains half a hollow mask, yellow eyes (the picture in the main article) and the ability to block sword strikes with his bare hands. His sword's energy blasts become ~~red~~ black (specifically stated in the manga) and can be guided to the target. Sure enough, the first time he uses this form in combat is during his final battle with Byakuya Kuchiki, an Aloof Older Brother, in the Soul Society arc. Sure enough, Byakuya doesn't do much more than widen his eyes a bit.
- The best part about this form is that it is truly opposite: he is always smiling, as opposed to Ichigo who is (almost) always frowning, he tells jokes, he's the complete opposite of Ichigo.
- Later on, Ichigo gains the ability to control his hollow through the help of the vizard, enabling him to voluntarily call forth a full mask and consequent powers. However, at the start, he can only maintain this form for 11 seconds. By the time the Huecho Mundo arc rolls around, the mask has become just another power-up, its 'evil' being utterly gone and leaving Ichigo in control. This wasn't achieved without a climactic Battle In The Center Of The Mind, however. Twice, even.
  - And judging from the last chapters, his Super Powered Evil Side Took A Level In Badass, complete with evidence of further Sanity Slippage. Instead of a cackling lunatic in a mask, he becomes a full hollow that speaks only in roars and likes taking his opponents apart one dismembered limb at a time.
Inu-Yasha's demon side in Inu Yasha, although it could also be interpreted as With Great Power Comes Great Insanity, as his bouts of insanity stem from having too much demonic power for his half-human body to handle. The Tetsusaiga acts as a Restraining Bolt.
- Subverted in that eventually the Tetsusaiga itself is so powerful that his demon side is actually weaker by comparison.
- Suikotsu of the Shichinintai is a doctor with Split Personality whose darker side is a sadistic, blood-thirsty murderer.
In Naruto, the Kyuubi, Sasuke's cursed seal, and to a lesser extent Shuukaku are all Superpowered Evil Sides, even though all three can be suppressed in some way.
- Sasuke's case actually only happens during the first activation. Additionally, the source of the cursed seal and its original user, Jugo, is an odd case but still fits to the point that he's called "Jugo of the Scales" (or "Bipolar Jugo" depending on the translation). The "odd case" comment comes from the fact that despite the Superpowered Evil Side being caused by the cursed seal, it's triggered independently of its use. This means he also fits to some extent in Split Personality and that actually using the cursed seal doesn't increase the chances of snapping and becoming a killing machine, so he can use it's power without much additional worry ("additional" being a key word here as he's always ready to snap). In theory he should be able to remain in his normal form while crazy, but since he wants to kill everyone this hasn't happened as of now.
Alucard of Hellsing is a sadistic, mass-murdering, cannabalistic vampire with a low opinion of human life as a general thing. If you actually manage to get him on the ropes, though, he can transform into a Shape Shifting black horror that can butcher opponents en masse or release all the souls he's eaten as a gruesome, blood-soaked army.
- However, there's no real indication that he loses control or anything when he does that. That's just his superpowered side... he's already got the evil covered. Arguably, Alucard himself serves the same purpose as a Superpowered Evil Side for the Hellsing organization as a whole.
- Seras Victoria's berserker mode could be counted as her Super Powered Evil Side.
Lucy from Elfen Lied is a variant of this trope - while she was originally the 'true' personality, she suffered a nasty head wound that caused Split Personality and left her nonpowered good side, Cute Mute Nyuu, in control. The times when her 'true' self resurfaces fits this trope to a tee.
Orson from Record Of Lodoss War is literally a Berserker Class and, when he gets angry, he becomes an unstoppable killing machine that wields a massive claymore as if it were a toothpick.
The "Shiki Nanaya" within Shiki Tohno in Tsukihime. Crucial in the manga/game but only used once (and not explained) in the anime.
- Many other characters in the Nasuverse have an 'inversion impulse,' the desire to go psycho and unleash their bitchin' superpowers on the world in an orgy of murder. Being a true ancestor or successor to a demonic or psychic bloodline helps. Sometimes, such as in Shiki Ryougi's case, this a true split personality, in others it's just buried bloodlust or some less conventional psychological artifact. In Arcueid's case, being a True Ancestor means using most of her insane amount of power simply repressing this impulse; letting loose would increase her power orders of magnitude.
- Melty Blood, the fighting game based on Tsukihime and Kagetsu Tohya, uses the Big Bad's plot-device-like powers to summon the Superpowered Evil Side of several characters, which leads to interesting pre-fight exchanges in "Doppelganger" fights.
- In Kagetsu Tohya it's revealed that his super powered demon killing side terrifies him. As such, he actually appears to have stopped using it.
Sumire's Anti-Virus mode (called "Berserker") in Venus Versus Virus.
Vash the Stampede's eponymous weapon in Trigun is triggered involuntarily by such events.
Yugi's powerful alter ego in Yu-Gi-Oh, Yami Yugi, is not actually evil, but he is a lot less concerned for the well-being of his enemies. Yami Bakura and Yami Marik, on the other hand, are both gleefully, psychotically evil. (Regular Marik isn't exactly a nice guy either.) In the manga, however, Yami IS evil, at least initially.
Yami Yugi: Couldn't I just mind-crush him?
Yugi: You can't fix all your problems by mind-crushing people.
Yami Yugi: Oh, come on! Just one little mind-crush, it'll barely hurt him.
Yugi: No! Bad pharaoh! No mind-crush!
Yu Gi Oh The Abridged Series
- Word Of God stated in a Shonen Jump Q&A that Yami Yugi actually WAS evil at first, due to a few millennia of his soul being imprisoned, but that his experiences with Yugi and his friends gradually helped him regain his sense of righteousness. This plot point was mostly, if not entirely, removed in the second animated adaptation.
  - Funnily enough, the plot point was revisited in the otherwise fairly pointless "Waking the Dragons" arc. After Yugi's soul gets imprisoned, leaving Yami in control 24/7, he starts to regress back to his original evil nature, without Yugi's kind nature there to temper his drive for vengeance. Which makes him a more vulnerable target to Dartz's machinations.
- Judai, Fubuki, and Kaiser in Yu-Gi-Oh GX... except Kaiser doesn't gain an evil side as much a new evil persona.
- Displayed in Yu-Gi-Oh 5Ds with the Dark Signers. Aki, too.
Tequila in Galaxy Angel II (and Galaxy Angel Rune, but since when has the anime had any actual battles?)
- Tequila isn't really evil, though. Just completely uninhibited.
The eponymous warriors of Claymore constantly run the risk of becoming "Awakened Ones" when using their powers. In that state, they become their superpowered evil sides without any chance of turning back to their original forms.
- The twist is Heroic Willpower lets the sufficiently motivated come back from the brink and even retain some control after completely transforming.
Quiet and retiring Haru's alter ego, "Black Haru," from Fruits Basket is a humorous take on the trope. In the anime (or early in the manga), at least. It's played for some serious drama later in the manga.
- Along the same vein, that goes for the brief 'cameo' of "Black Yuki" in the later chapters as well.
When Yuri from Kyo Kara Maoh reaches an appropriate level of moral outrage, he involuntarily transforms into a larger version of himself with cooler hair, amazing magical powers and a thirst for justice.
When Kazuma of Kaze No Stigma taps into his evil side (really a reversion to his old behavior in his backstory), he will do whatever it takes to accomplish his goals, no matter who he has to hurt (or mind crush!). Kazuma may actually be a subversion if Ayano is correct in her analysis when she faces him to try and stop him from going on his rampage. She states quite clearly that he used to be so overwhelming that it seemed to be stupid to be afraid of him. Because she was afraid, it was proof that he was weaker than before. In any case, he's still very kick ass.
In Jojos Bizarre Adventure part 5, the protagonist Giorno Giovanna develops a new stand "Golden Experience Requiem" which is intelligent and can act on its own, and completely destroys his enemy Diavolo, causing him to experience death over and over again for all eternity.
Ginji's Raitei persona in Get Backers. Kazuki also has one, when he releases the seal on his Stigma eye. The same way Ginji is the "Thunder Emperor," he's "the Prince of Terror."
In Daa! Daa! Daa!, you can see a crystal-clear example in Christine, the older Hanakomachi... when a girl (human, alien, it doesn't matter) approaches his beloved Kanata in a remotely romantic way, she emits a black aura and her eyes glow: it's your cue to get the hell away. In such state she is capable of feats like lifting trees & breaking concrete walls. She's not evil, just clingy.
Subverted in Samurai Deeper Kyo: prior to his further training under his master Muramasa, Onime no Kyo was in fact weaker than Mibu Kyoshiro, who was merely feigning weakness to complete the facade of a harmless medicine peddler.
Moka's "super-vampire" side in Rosario To Vampire. Super-Vampire Moka speaks to her normal self through her Power Limiter, giving her guidance that she needs. This one isn't evil so much as very emotionally cold, though.
In Heroic Age, the giant mech-like warriors of the Heroic Tribe, called the Nodos, can eventually let out a Superpowered Evil Side when two fight together - whether against each other, or side by side - called Mental Chaos, when they enter a pure blind berserker rage. Considering a single Nodos can sometimes destroy a whole planet on its own at its normal levels of power, a Nodos in Mental Chaos is a frightening thing indeed. In Bellcross, the Nodos that serves the human Age, Mental Chaos is shown by his skin and "armor" turning dark gray, almost black, and a set of blue spheres implanted in his body begins to glow bright red. And he roars a lot.
Guts, the protagonist of Berserk, is known to slip into this state during particularly tense moments.
- In the manga, this becomes personified by The Beast, a feral lupine creature formed from the considerable amount of rage at the Godhand (and Griffith in particular) and other negative emotions that Guts suffers from after the Eclipse. When Guts is under The Beast's influence, he becomes a danger to everyone around him, even the people he loves — at one point in the manga, he almost rapes Casca while under its influence. Later on, he acquires the Berserker Armor, an extremely dangerous cursed Dwarven artifact that blinds its user to pain and limitations and causes them to see everything as a threat. It also becomes a kind of physical conduit for The Beast.
In the h-anime Makai Tenshi Jibril (Translated title: Jiburiru - The Devil Angel), Meganekko-with-a-crush Meimi is given the sadistic Magical Girl persona of Misty May, the "Devil" counterpart to the heroine Rika, (St. Jibril/Jiburiru)
- Closer to the trope definition would be Rika's evil form in the sequel, or Hikari's Black Aries form in the third game.
This happened in Guyver once, but it was a doozy. After his father was turned into an Enzyme Zoanoid and ripped out Sho's brain, the Guyver itself took over Sho and killed his father. Let's just say that when he found out, he didn't take it well.
- Though this wasn't so much the Guyver being evil, as obeying its Prime Directive of wearer-preservation.
In D Gray Man, Allen's Innocence seems to have a mind of its own and tends to upgrade itself when Allen gets particularly angry or emotional. It also can control Allen when he's unconscious, and it tends to be very vicious. Then again, it's only dangerous to Akuma.
- Also the vampiric Arystar Krory, although he has less of a Superpowered Evil Side than a Superpowered Deadpan Snarker Bad Ass Side.
- There's also the Noah, although they're (affably) evil to begin with.
How has Son Goku from Saiyuki gone unmentioned? His 'evil side', the Seiten Taisei, is akin to a heretical chaos god and nearly overthrew the Heavens, goes on an Unstoppable Rage whenever unleashed, and usually ends up trashing both the enemy, AND his teammates by the time he's finally stopped. The only thing that keeps him in check is the crown he wears which serves as a Restraining Bolt.
In Soul Eater, Soul Eater is infected by some of Medusa's black blood, which manifests itself as a devil living inside his head offering him power in return for giving in to the insanity. On the one occasion he and Maka give into it in order to stand a chance against The Dragon, the trope is almost fulfilled to a tee... Except it's not so much a 'superpowered evil side' as a 'Nigh Invulnerable giggling lunatic side who catches The Dragon completely off-guard'. They barely make it back to sanity, which the devil seems to consider this a temporary setback.
- While not anywhere as drastic a change as Maka, Stein's tactic against Medusa, of giving into his own madness, could also be seen as this. Though this side is not so much 'hidden' as it is what Stein would be if he didn't hold himself back through fear. He also seems able to control it frighteningly well, if Spirit's comments at the time are anything to go by.
Koyori in Nurse Witch Komugi has a literal evil Magical Girl Split Personality that she is completely unaware of.
Lina from Slayers when she's possessed by the being that accidentally created the universe and would really like to undo it.
- IIRC, Word Of God says that The Lord of Nightmares less an evil entity and more a Cosmic Horror whose motivations are so alien that her moral character is essentially irrelevant.
The "berserker spirits" aka The Dragons from Ikki Tousen. So far, we have four dragon holders: Hakufu, Ryuubi, Sousou, and Ryoumou
Sonic X: Absorbing the negative energy of an entire factory's worth of fake Chaos Emeralds coupled with seeing his friends tortured unleashed Dark Sonic for the first time in animated continuity. Complete with white eyes and navy-dark energy all over his body, plus the ability to tear anything that pisses him off to shreds.
- Super Sonic in the British Sonicthe Comic comic series. In that comic's canon, the Chaos Emeralds are full of pure evil (as energy), rather than their neutral alignment as confirmed as canon by Sonic Adventure. Super Sonic came about by overexposure to the Chaos Emeralds, and as such... he's totally insane, and totally evil. Not to mention sadistic, psychopathic... and equipped with the power of the Chaos Emeralds.
- Although it's not strictly evil, the Were-Hog form in Sonic Unleashed could be considered a Superpowered Evil Side... except that Sonic isn't really evil in that form, just super aggressive and destructive.
The main character of 666 Satan is actually the container of Satan himself along with nine other demons that have the ability to possess people. There are also ten angels, none of which are evil or attempting to take over but some are incredibly vain and judgemental.
While not necessarily "evil," a mechanical version of this can be found within Gundam Wing, specifically in the form of the Zero System, a computer system in the Wing Zero which interfaces with the pilot's brain, enhancing his reaction time and aggressiveness, and allowing him to process tactical data with superhuman speed and efficiency... with a fun little side effect of driving the pilot temporarily insane. The Epyon uses a knock-off of the Zero System which has an even worse effect; when Heero pilots that mecha temporarily, he goes on a murderous rampage.
- Gundam 00 also has fun with this - Allelujah Haptism has a Split Personality: Hallelujiah, a blood-thirsty "warrior" half whom is much more skilled than just about any other pilot in Celestial Being, Setsuna included.
  - Then subverted with The "Ultimate Soldier", aka H/Allelujah or Doublelujah, whose an even better pilot and integrates the best parts of both personalities, including Allelujah's morals.
Dark Schneider/Lucien in Bastard. Tiny, fifteen year old boy turns into the infamous eponymous bastard, the all-powerful Exploding Wizard. Then subverted since Darsh does a lot of dorky things outside of battle and seems much more like a Jerk With A Heart Of Gold than anything else, with some people often remarking that compared to the Dark Schneider of fifteen years ago, this one is practically a saint.
In Saikano, Chise's personality while in the Ultimate Weapon form could be psychotically vindictive, threatening on multiple occasions to utterly eradicate anyone who got in her way or made her mad, be it friend or foe... and that she could do so with ridiculous ease made her even more horrifying.
Parodied in Yu Yu Hakusho. Yusuke dies, it is revealed that he is in fact part demon. Said demon blood kicks in and he gets better, with his demonic powers lending him a considerable increase in strength. He then decides to have a little fun at the expense of some alarmist commandos who wanted to take him out.
Yusuke: For what I desire is ending the world and everyone in it. For I am the mighty Mazoku, Lord of Evil! And now, after hibernating for a thousand years I will finally reveal my true form! AHAHAHAHAHAHAHAHAHA... psych!! Damn, you guys are gullible!.
- Late in his fight with Sensui, the trope is played straight, as while he still isn't quite able to overpower him, his demonic ancestor Raizen takes control of his body and makes him considerably faster and more powerful, enabling him to easily defeat Sensui.
- Sensui himself is an inversion of this trope. Of his seven personalities, the strongest one is Minoru, the original one, and the only one to remain pure and innocent.
- Kurama displays a variant on this trope in the Dark Tournament when his opponent tries to reverse his aging to make him a baby, but goes to far and reverts him to his previous incarnation as a powerful demon bandit.
Mayo Kagura from Mai-HiME Destiny. In a series where everyone has psychic powers, it's hard to stand out when you have boring ol' telekinesis... unless you have a Superpowered Evil Side that can uproot trees and use them as weapons.
Ryo Takatsuki from Project ARMS. His right arm is a nanite-based entity known as the Jabberwock. Get him ticked off enough, and the Jabberwock spreads over and takes control of his entire body. Though more really, really angry rather than outright evil, this doesn't stop Jabberwock from doing such feats as tearing apart an entire helicopter division, numerous other ARMS, emitting fire, and much, much more. Oh yeah, and it evolves too.
In Omamori Himari, all demons, including Himari, can fall prey to their instincts or desires and become savage beasts. In Himari's case, she turns into a nigh unstoppable juggernaut-but, like any other demon, she runs the risk of not being able to return to normal. It's explicitly stated that in this situation, they will be exterminated.
As of recent events in Mahou Sensei Negima, it seems that the "Encroachment of Magia Erebea" is causing Negi to develop one of these.
Urd of Ah My Goddess (at least in the anime).

Close Anime and Manga

Though not portrayed this way in the original comics, all subsequent portrayals of the Venom symbiote from Spider Man have made it out to be this, with even the comic book symbiote having been RetConned into a more malevolent entity.
The Incredible Hulk is the canonical super-Hyde. The Hulk, over time, has been softened down from "evil" to "pure id". Not that that stops him from racking up the damage bill every time he shows up.
- Banner does have the Devil Hulk personality inside him, which is pure evil.
- As well like Gray Hulk and Guilt Hulk
Wolverine has a tendency to lapse into a "berserker rage" while in close combat. In this state he lashes out with the intensity and aggression of a mindless animal and is even more resistant to psionic attack. Though he loathes it, he acknowledges that it has saved his life countless times.
The New Mutant Magik, way back when, was partially transformed into a demon by Belasco. Her "Darkchylde" side is intelligent but malicious, though almost powerless on Earth, where her magic doesn't work very well. In the end it took over her and nearly ended the world in a major Crossover Event.
It's still not clear whether Dark Phoenix is Jean Grey's Superpowered Evil Side or a variation on Grand Theft Me.
- Whether Jean actually became Phoenix (and then Dark Phoenix) or was merely replaced by the Phoenix Force is in an almost constant state of retcon, so the confusion is quite understandable.
In the British Fleetway Sonic The Hedgehog comics, this was how Super Sonic was. When he split from Sonic and lost his powers he mellowed out, but returned to form when he got them back. The Archie comics did a homage to this in one issue, although in that canon there's generally no personality difference between Sonic and Super Sonic.
The Sentry and the Void, from Marvel Comics, are this trope taken to its extreme. They manifested as alter-egos of a single person, representing the good and dark sides of humanity, respectively. The Sentry is a superhero and the Void is a supervillain. They've also split into separate bodies, and sometimes make out with each other.
- ONE TIME. And immediately following this, the Sentry threw the Void into the sun. Given the Void's speech prior to this, this doesn't decrease the Foe Yay any, though.
Stephanie Maas/Critical Maas in Rising Stars, in which the only normal in a town full of superheroes actually just shunted her super powers (including flight, strength, and creepy-puppetmaster mind control) into her secondary, psychopath personality.
- Incidentally, Critical Maas is undoubtedly the inspiration for Heroes' Jessica/Niki, right down to her history of abuse by her father and her penchant for calling her 'weaker' half 'little mouse'.
Jackie Estacado in The Darkness also fits this, and even likes it during the early parts of the series, as it gives him more unique ways to kill people.
Mr. Negative, new Spider-Man villan take this to a whole new level he was born when personality of some thougt divide on two parts - pure good become filantropist Martin Li, while pure evil become Mr. Negative. Both fights with each other in interesting way - Negative likes to corrupt all Lee's good deeds, while Lee helps people that suffers because of Negative.
Curt Connors and Lizard are often potrayed this way Hoever, there's a Ret Con wich reveals that Connors was always in control of Lizard and left him out when life was too hard for him. He just keep teeling himself it's not truth.

Close Comic Books

Subverted in the comedy The Animal.
Nathan Wallace in Repo! The Genetic Opera is a sweet, loving, family man. Until he puts on his helmet, at which point he becomes the merciless Repo Man.
Heavy Metal segment "Captain Sternn". While under the influence of the Loc-Nar, Hanover Fiste grows into a mightily muscled hulk and smashes through all opposition in an attempt to murder Sternn. Once everyone's gone, he turns back. Sternn then thanks him for getting him out of the trial... before shooting him out of an airlock in lieu of payment.
The version of Venom in the third Spider-Man movie is, of course, Peter's superpowered evil side, and it begins to affect his personality. The catch is, Venom's just enhancing Peter's latent personality traits, so out-of-costume his evil side comes across as a massive dork, and he is generally an asshole to everyone rather than being a figure of terrible power.

Close Film

Most incarnations of Jekyll And Hyde in popular culture portray Hyde as inhumanly large and strong, often ape-like. (For instance, the movie Van Helsing, The League Of Extraordinary Gentlemen, etc.) In the original book, there is nothing superhuman about Hyde; he simply gives free reign to his base instincts. In fact, it is explicitly stated that Hyde is smaller than Jekyll, as Jekyll is more a good man than an evil one. In the second volume of League, Hyde acknowledges this, but explains that the longer he's given free reign, and the more impotent Jekyll (the "good side") feels, the more powerful he becomes.
In Redwall, some animals (usually badgers) have an attack/split personality called the "Bloodwrath" which makes them extremely powerful, very resistant to pain... and also no longer able to tell friend from foe, meaning it's dangerous to anyone who's nearby when they go into this rage.
Johnny Truant channels his Superpowered Evil Side against Gdansk Man in House Of Leaves. The way in which Truant thrashes him and how the book describes Gdansk Man's wounds afterwards has led to some Epileptic Trees, such as Johnny Truant is ~~the Minotaur~~.
Most werewolves that aren't villainous in human form get a lot more powerful and don't mind the taste of blood when transformed. Both the Kitty Norville and Mercy Thompson series have werewolf choosing their animal form for combat, and the Kitty Norville series portrays the Wolf as an alternate personality. The Wolf won't go out of its way to Kick The Dog, but it won't really care about taboos regarding cannibalism or murder.
Exar Kun, Darth Vader, Ulic Qel-Droma, Darth Malak... when a Jedi falls to the Dark Side, it's time to get the hell out of Dodge.

Close Literature

Niki in Heroes has her amoral alter ego Jessica ("ikiN"), who has sole control of her super strength until the finale, when Niki finally gets to use it for herself. She might have used it once on impulse a few episodes prior to stop an attacking policeman—this is debatable.
- In the second season, it was explained that Niki, like some other metahumans, subconsciously manifest another personality imbued with their ability (leaving the original personality powerless) as a result of being metahumans, or because of the original personality's inability to cope with the reality of being a metahuman. When Niki conquered the Jessica persona at the conclusion of the first season finale, she manifested a third personality named Gina several weeks later.
A really beautiful Deconstruction is the British TV series Jekyll.
Lori developed one in the Big Wolf On Campus episode "Manchurian Werewolf" after being bit by a brainwashed Tommy. She became a member of the werewolf syndicate. Merton also got a dose of the evil life in "Everybody fang chung tonight" and "Boy who tried wolf" where he become a vampire and a werewolf.
Pretty much every Heroic Vampire protagonist or Supporting Character: see Forever Knight, Angel, and Moonlight.
- Angel gets listed twice because he's from Trope Overdosed Buffy The Vampire Slayer.
Kamen Rider Kabuto's "Kamishiro Tsurugi" is actually the Scorpioworm, who actually manages to overpower both Cassisworm Clipeuses when he was unable to defeat even one as Kamen Rider Sasword.
In the live-action Pretty Guardian Sailor Moon, Sailor Moon's alternate persona Princess Moon is pretty much a Superpowered Love Makes You Evil Side.
In the Farscape universe, starving Delvians start sprouting growths that paralyze any predators that touch them, turning would-be predators into prey. If that doesn't help, they'll start emitting spores, gradually paralyzing any and all lifeforms in the vicinity. In this state, higher cognitive functions are compromised, gradually turning them more and more feral. And if the said Delvian is Zhaan who was nice only due to her Heroic Willpower in the first place...
Buffy The Vampire Slayer has several of these:
- If Angel loses his soul (due to the lingering effects of a Gypsy Curse), he becomes the brilliant and formidable Angelus, widely reputed to be the most vicious vampire in history. As Cordelia Chase once queried about Angelus's evident genius compared to his heroic alter ego's, "...what is it about evil that jacks up the I.Q. points?"
- Willow has Dark Willow, which she touches whenever she taps dark magic. Easily identified by the Black Eyes Of Evil.
- Giles' Ripper persona isn't quite an example, as the Ripper is actually no more powerful than Giles, he just has fewer compunctions.

Close Live Action TV

Cuchulainn from Irish mythology has a prime example of this kind of Unstoppable Rage, making this Older Than Dirt. In the epic, Táin Bó Cúailnge, he enters a "Ríastrad" or "Warp Spasm". In this state he transforms into a horribly mutilated monster whose very appearance is enough to scare enemies away. The catch is that, while in this form, Cuchulainn may not know friend from foe.
- See Slaine from {{2000AD}} to see just how mutilated.

Close Mythology

This crops up in the various World Of Darkness Role Playing Games, especially those featuring Vampires and Werewolves. One Tag Line for the original Vampire: The Masquerade was "A Beast I Am, Lest A Beast I Become" — leeches had to allow themselves little atrocities like controlled blood-drinking to avoid being consumed entirely by the madness of their inner blood-hunger.
- Werewolves, on the other hand, don't tend to view their own berserk frenzies as "evil" (after all, Rage is a gift from Luna... and they have plenty of reason to be really, really pissed off). However, if they give in to their Rage too fully, they can enter a state called "Thrall of the Wyrm," just like a normal frenzy, except that it's inescapable, and tends to provoke rather horrific behavior (typically either cannibalism, dismemberment, or... er... defilement).
- WoD Wraith 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 generally loathe to do so because there's no telling what else the shadow might do while in control.
- 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.
- Although not directly part of the World of Darkness, Exalted has a couple instances where the characters go temporarily insane on some level. But 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 Battle Aura, and grants them intense and brutal combative skill. Remaining in this state too long, however, sends them into an Unstoppable Rage, 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.
  - The Solars have nothing on the Ghost-Blooded, who (in the first edition at least) could learn a certain Arcanos called Lower Soul Ascendant, which fits this trope to a T — increased physical power at the cost of embracing sociopathic behavior.
In Dungeons And Dragons 3.5, there is a prestige class called Frenzied Berserker. Once they've Frenzied, which is like a Barbarian's Rage but moreso, they attack until either the frenzy runs out, they are incapacitated/dead, or there's nobody nearby.
Highly common in Warhammer 40000, and one of the reasons Space Marines (Grey Knights in particular) are required to pass such rigorous and often deadly mental trials as a method of prevention. The most obvious are the Blood Angels Chapter and its successor chapters, whose members are known to succumb to a condition called the Black Rage which increases their already Super Soldier levels of strength and vitality and turns them into frothing berserkers who seek only death, often organised into aptly-named Death Companies led by skull-helmeted Badass Preachers. The Eldar however create one of these intentionally, inducing a form of split personality disorder so that in battle they can fight with unhindered skill and brutality while retaining absolute control over themselves the rest of the time. Then there's Chaos, which, being The Corruption and Always Chaotic Evil personified, fully embraces the added power this trope provides with no concern for the consequences, because "sanity is for the weak".

Close Tabletop Games

Ryu, from the Street Fighter series of video games, has a power inside of him known as the "Satsui no Hadou", or Surge of Murderous Intention, which he works to suppress and was retconned as the reason that Sagat received the scar he bears on his chest. Akuma (Gouki in the original Japanese) represents someone who has fully given in to the Satsui no Hadou, and when he's not holding back, he is truly fearsome. In Street Fighter Alpha 3, 'Evil Ryu' is actually a secret, playable character - a dark-skinned, red-eyed version of Ryu with some additional attacks from Akuma's movepool.
- Note that Akuma is an example of a character who has embraced the "Satsui no Hadou" but remains in control of his power at all times (he just holds back portions of it at various times). Ryu's Superpowered Evil Side is a result of his being unable to control the power. However, since the power still involves a willingness to kill and a more brutal mindset even when in control, he makes no effort to even try to learn how.
In the third game in the recent Prince Of Persia trilogy, the Prince occasionally transforms into an alter ego with a bladed chain-whip (and the skills to wield it gruesomely, out of nowhere) and who can completely regenerate whenever exposed to the Sands of Time, but at the expense of constantly deteriorating health otherwise. The Dark Prince is also a sociopath with a massive entitlement complex. Even when in the Dark Prince body, the Prince remains in control, but the Dark Prince hints that the health draining out of you is actually going into it, and that dying of this will give the Dark Prince control of the body (and, incidentally, Babylon).
Soma Cruz in some of the later Castlevania games inherited Dracula's soul, while Alucard is his son (sort of). The emergence of their Superpowered Evil Sides are Alucard's greatest fear and Soma's bad ending.
The Slayer from Baldurs Gate II, a ten-foot tall spiky mass of pure murder that the protagonist ends up gaining access to. Using it results in a reputation loss, except for scripted events that force you into it. Plus there's the whole thing about it killing you (and thus ending the game) if you stay in that form for too long.
Rozalin from Disgaea II manifests a Superpowered Evil Side during the storyline when her seal is broken, which turns to be her former life as Overlord Zenon, complete with both memories and power, back from the dead.
- Mao from Disgaea 3 has a similar Superpowered Evil Side that can go on a complete rampage in one of the endings.
From La Pucelle Tactics, Croix has his Superpowered Evil Side as the Dark Prince serving the fallen angel Calamity.
Iori Yagami in The King Of Fighters is normally amoral, and (judging from his winposes) has quite a few screws loose. Riot of the Blood Iori, however, has absolutely no sense of self-restrain and will attack anything on sight.
- Leona also fits this trope, sometimes even more perfectly than Iori, due to the fact that she is in the "good side", while Iori can't decide himself; with some Emotionless Girl spices added, though that said, she has smiled once◊.
Jaster Rogue in Rogue Galaxy does this, although his "evil" side isn't so much evil as so far above everyone else that he barely notices they exist. Hard to tell the difference from the "normals" point of view, though.
Johnny Garland gains this far into the third Shadow Hearts game. Johnny actually died at a very young age along with his sister, Grace. Their father managed to get his hands on the series' Tome of Eldritch Lore, in hopes of resurrecting them. He only succeeds in reviving Johnny, as his sister gives up her humanity in order to save him, leaving her an empty shell, "Lady". Because Johnny's body is composed of both "Malice" (negative energy) and "Will" (the human soul/spirit), after being fatally wounded by Killer, his "true" Malice form, the Awaker, emerges.
In Xenogears, one of the primary villains for the first half of the game, Id, turns out to be an alternate personality of the primary hero, Fei. Id was completely different from Fei in appearance (except for the face itself) and had several magnitudes more power than him.
And how can we forget Zero of the Mega Man X/Zero series who gains several powerful new abilities whenever he is controlled by The Virus.
Elena's alternate personality Millenia from Grandia II.
Anti-Sora from Kingdom Hearts 2. Ironically, while Anti-Sora looks damn cool, he's not actually much more powerful than Sora in terms of offense, and can do nothing other than attack solo in a frenzy of clawing and kicking. The inability to heal, gain experience, or really do anything else makes this form a liability, and it can't be entered deliberately.
- That's more of an example of Sora's drive forms occasionally being Blessed With Suck, since Sora is still in complete control of himself; he just happens to look like a heartless for the duration. Riku, on the other hand, plays this trope straight in all four games, but primarily in Chain of Memories when you can play as him and "Dark Mode" is one of his key abilities.
In Metroid Prime 3: Corruption, Samus gets the ability to enter Hypermode, fueled by the evil substance known as Phazon. Staying in this mode for too long corrupts her, leading to a Nonstandard Game Over, specifically turning into another Dark Samus.
Dark Jak from Jak And Daxter's attempt to become Darker And Edgier.
- Although interestingly subverted by Light Jak in Jak 3... which is a superpowered GOOD side.
Sonic the Hedgehog has one in Sonic Unleashed. At night, he'll turn into Sonic the Werehog, a bulky werewolf-esque form of himself with super strength and stretchy arms. Though his personality remains more or less the same except for the obligatory howling.
In Super Smash Bros Brawl, Bowser's Final Smash transforms him into the even more monstrous Giga Bowser, although he was evil to being with, kind of.
- Giga Bowser is pretty much Evil Bowser since Bowser isn't much of a villain these days (he's been taking a back seat to eviler people recently).
Almost every member of the Mishima Family in the Tekken series. Also Ogre/True Ogre.
- Only Jin adheres to that fully with Devil Jin, however. Kazuya was evil all along, calling his Devil Form would be more like normal Super Powered self. And Heihachi is just that evil, he doesn't need an evil side to get more evil, super powered or kick ass.
- Jinpachi could be said to be another example, as he holds the King of Iron Fist Tournament 5 to find somebody to stop him, as he could feel the Devil taking over. He also sends a letter to Wang, his old friend, to have a go as well.
In the early Soul Calibur games, Nightmare was supposedly a Demonic-Sword-induced version of this for Sigfried. The latter freed himself in SCIII, but his armour and residual evil power was too attached to Soul Edge to die.
- Two far more definitive examples show up in SCIII as the boss Abyss (spawned from Zasalamel's quest for the power to die), and bonus boss Night Terror (Nightmare on serious 'roids).
Fighters Destiny has a clown character, and there's a cheat you can use which turns him into a werewolf.
Primal has its main character who personifies this when in any of her monster forms.
Subverted in Muppet Monster Adventure.
It is revealed in .hack//GU that Natsume has a split personality: Her normal self is her cheery, slightly ditzy self while her other self is crazed, rampaging Pker known as The Edgemaniac. This is played for laughs.
- In the movie adaptation, Haseo's B-St Form is basically this trope incarnate. Even if all it did was make him look pathetic against the final boss...
Vincent Valentine from Final Fantasy VII can transform into a variety of monstrous forms using his limit breaks. Possible forms include Frankenstein's Monster, Jason Voorhees and Chaos, the Big Bad of the first game in the series.
Django, the gun-slinging hero of Boktai. In the second game of the series Django is infected with vampirism and almost loses his soul before his half-brother Sabata purifies him with the Solar Pile. After this, Django eventually gains the ability to transform between human "Red Django" and vampire "Black Django." Though it might be argued that Black Django isn't that much more powerful as, despite his dark-based powers, he loses the ability to use all of Django's magic (gaining new spells only he can use) and is harmed by both rain and sunshine.
The Terror Mask in the Splatterhouse series embodies this trope, especially in Splatterhouse 3 where its own personality, and its effect on Rick, become more apparent.
In Majora's Mask, Link can trade all of the masks in the game (no mean feat, mind you) to turn into a Badass infused with the power of an angry god. Sweet, innocent little Link can then tear through any boss in the game with little difficulty. However, the mask can 'only' be used against bosses without using a cheat.
Queen Arshtat Falenas in Suikoden V took the Sun Rune into her to prevent it from falling into the "wrong hands." Ever since, she melodramatically rants and cackles authoritatively whenever her "divine rule" is threatened. Once, she even unleashed the Sun Rune, completely dessicating a lake and its nearby landscape and leaving her nearby subjects to die a wasting death. All in all, a Superpowered Evil Side is a great way to balance The High Queen and her darker counterpart, leading to a natural aloof regality.
In The World Ends With You, the Bonus Boss is the Noise form of Hanekoma, and since he really kills you if you .lose, it can be seen as this. The fact that, during the fight, he spews his human form's inspirational phrases like battle cries could show that he's not quite in control.
Emil from Tales Of Symphonia: Dawn of the New World has Ratatosk mode, where he morphs from a Woobie-ish Non Action Guy into an ur-Bad Ass Anti Hero Blood Knight. It's not so much that Ratatosk is Emil's Super Powered Evil Side; instead, Emil is Ratatosk's Non Action Guy side. Like the case in Elfen Lied, the "evil" side is the original person.
At one point in Wild ARMs 2, Ashley is transformed into some kind of zombie-like creature early on, but before he is taken completely, he makes it to the Argetlahm and pulls it out — this has the result of countering the demon within him with the good force of the sword, and the resulting combination is a badass black-armored-red-trimmed entity called Knight Blazer. He can't actually use it in battle until a few plot points later, but once he gains the ability, nearly every remaining boss fight in the game boils down to letting him transform in order to open up a can of whoop-ass. At one point, in a moment of Unstoppable Rage fueled by a terrorist threatening his girlfriend, Knight Blazer actually takes another level in badass and transforms into a gold-armored knight with extra abilities that is that much more powerful. And then at the end of the game, the "demon" portion escapes Ashley's body and reveals itself to be the Cosmic Horror responsible for devastating the world centuries ago, Lord Blazer. Of course, this leaves Ashley with the holy sword. Guess who wins the resulting boss fight.
In 'Megaman Battle Network 4'', if MegaMan turns dark enough from the use of dark chips, his dark side will appear after he is K.O.'d and start fighting. MegaMan gains control back after a while.
- Chaos Shadow Soul in Battle Network 5 made Mega Man completely invincible and uncontrollable as the AI attempted to duplicate the player's fighting style. Speaking of which, the fight against Dark Rock in Battle Network 4 did the same, using every chip the player had ever used and weighting the ones the player used more often.
In the Heaven's Feel route of Fate Stay Night, Sakura Matou's Superpowered Evil Side is powerful enough to defeat True Assassin, Gilgamesh, and Zouken Matou.
In The Suffering, you get to change into some... monster thing that can tear enemies (body horror like freaks of death and human atrocities). It is implied that your character does not actually transform, instead he goes into a rage that boosts his strenght. But then how does he make spikes pop from the ground...?
The Fierce Deity Mask (called the "Oni Mask") in Legend Of Zelda: Majora's Mask is treated as one of these in Fanon; canonically, at least the Skull Kid thinks it's the mask of a "bad guy".
Legend Of Mana has two characters who have a Superpowered Evil Side: Pearl has Blackpearl, what she was like pre-Laser Guided Amnesia and the Mana Goddess.
In Painkiller, when you collect 66 souls of enemies you killed, you transform into an unstoppable demonic killing machine. It only lasts for about 30 seconds but that's all the time you'll need to obliterate an area full of monsters just by looking at them.
It may not be on quite the same level, but in Pokemon Colosseum, there's a random chance that a Shadow Pokemon might go into 'Hyper Mode' during a battle. The Pokemon in question will be surronded by a black aura, and will do more damage - BUT. It won't be able to use any moves you've unlocked, it can't be healed, and it will also take recoil damage when it attacks. Thankfully, you can call out to it, which brings it back to it's senses.
Jin from Blaz Blue, normally a smug, arrogant Jerk Ass, goes completely berserk when in combat, especially if his opponent happens to be Ragna.

Close Video Games

Roger in College Roomies From Hell. Unleashing his werecoyote side is often the Roomies' only way out of a tight spot, but he has trouble controlling it, and he's been warned by another werecoyote that sooner or later he'll be unable to change back.
- He actually has a second werecoyote form that is a stronger embodiment of this trope.
Graveyard Greg of the Gaming Guardians 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".
Last Resort has Jigsaw, since apparently all vampires in her galaxy can transform during their Unstoppable Rage.
In JACK, 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 absorbs and seals the sin of Lust, who talks to him, hassles him and will sometimes help him in fights through his cloak.
While 'Fallen Grace' (AKA 'Dark Omega Grace') from El Goonish Shive falls much closer to the Crouching Moron Hidden Badass type, she still deserves mention here. Not only is Fallen Grace actually willing to use her shape-shifting powers as a weapon - unlike the pacifistic (NOT Technical Pacifist) Grace - she's also got access to the Lespuko Spurs; special claws that retard healing, thus neutralizing the advantage of the Healing Factor. She's also got horns, Hellish Pupils, and a whole lotta spikes.
In Gnoph, Will's symbiotic partner Lyss usually acts as a Bond Creature; but when he passes out and she takes full control of his body, she acts like an example of this trope, due to being Ax Crazy and having no compunction against killing (or eating) humans.
Subverted in Order Of The Stick: It initially looked like the comic was going down this path when Vaarsuvius made a deal with three devils in order to save the lives and souls of his/her family. Having successfully rescued them from a dragon, (s)he then proceeded to use epic magic to slaughter as many as a quarter of the black dragons in existence, in what was widely held to be a Moral Event Horizon by the audience. The next strip reveals that, contrary to what the devils said earlier, the power-up had no effect on Vaarsuvius' ethics and that whatever atrocities (s)he just committed were all of his or her own doing.
Black Mage from 8-bit Theater has one of these. Considering that he's normally an Omnicidal Maniac with enough power to destroy entire cities, this should tell you something.
- And now, omniscient superwizard Sarda has absorbed Black Mage's superpowered evil side. Lampshaded thus:
  Sarda: Who knows what kind of sadistic and impossible stuff I'll do now.

Close Web Comics

A fairly goofy example occurs in episode 40 of Red Vs Blue: 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!"
Caboose: Now I'm thinking of a kitten... covered in spikes... that makes... me... angry... YYAAARRRRGGHHH!
Caboose jumps off the roof he was hiding on, shaking the ground when he lands
Caboose: My name is Micheal J Caboose, and I. Hate. Babies!
Red Zealot: It's the beast! The Anti-Flag! Come to live among us and rule for seven years! The end is nigh- blleergh!
- He did this by replicating the effects of being possessed by the AI O'Malley, who gives whoever he inhabits a Super-Flanderized evil side, which in Tex's case makes her super aggressive. When he inhabited Grif he wanted to Take Over The World, but was too lazy to do anything. Only Church is immune to this effect, being as cynical as it is possible to be already. Among other reasons...
In Tales Of MU, the side of Mackenzie that some fans have taken to calling Kenzie is two details off from being a textbook example of a Superpowered Evil Side: First, Kenzie is triggered by hunger instead of desperation in battle. Second and more distancing, the closest thing to a superpower Kenzie has over normal Mack is being willing to hurt people that are trying to kill her.
Shandala in Broken Saints has some serious issues.

In the DCU role playing universe of JLA Watchtower/DC Nation, Fauna, a sweet, quiet Granola Girl shapeshifter has this problem if you push her too far. Also, the more complicated her shapeshifting or extensive the use of her other abilities, the more feral she becomes.

Close Web Original

In the Teen Titans cartoon, a splashing of chemicals prompts good-natured vegetarian Beast Boy to turn into a surly, meat-chomping bad boy who later turns into an anthropomorphic wolfman that was capable of taking on the entire team (as well as another wolfman). Later it's explained that, instead of turning Beast Boy into an actual lycanthrope, the chemicals only unleashed what was already there, and he's given an antidote so that he won't transform against his will. He once again manifests this hidden wild side in a battle against Slade, slicing through a number of his goons before Slade puts a stop to it with his own supercharged powers.
- Possible subversion: It's made quite clear that "Man-Beast" isn't evil, just a really powerful, rather intelligent animal. Like any animal, it becomes hostile when scared, but generally it keeps to its human form's wishes. Beast Boy still expresses concern that it's still inside him at the end of the episode.
- And of course, there's Raven's 'Daddy Issues'. Dr Light should really have backed off like she told him.
Kim Possible: Ron Stoppable is ordinarily a likable goof, but he's been zapped a couple of times with Applied Phlebotinum with superpowered evil results. The first time, the device was malfunctioning and gave him a transfusion of Dr. Drakken's evil, turning him into the insane, fiendish, blue-skinned, cleverer-than-Drakken-by-a-long-shot "Zorpox the Conqueror." The second time, the device was a properly-working instant Face Heel Turn button. One might simply chalk it up to a removal of inhibition, of course, as Ron has some serious mystical mojo that backs him up at critical instances. The point is, Ron's evil side is inexplicably hyper-competent to the point of being slightly unnerving (enough to cow Shego into obedience) — he mastered the art of having multiple plots within what may well have been hours of his conversion, and showed himself to be a serious, focused martial artist, at least the equal of Kim. Granted, he HAS had secret ninja training...
- Ron loses focus easily, his evil side doesn't. When Ron gets focused, he becomes competent. But where the heck did his evil side get the skills to invent that plasma catapult thingy?
- Actualy, Ron is an intuitive genius. In other words, he is actually very intelligent, he just isn't aware of it, and has a hard time learning something that doesn't interest him. For example, his vocabulary, it is by far the most sophisticated of the cast, which he picked (probably) from movies: "Keep your friends close, and your enemies closer" a quote that Ron took from maquiavel. Also, his doom machine, that Drakken threatened him to do, actually worked, and was made from scrap parts. Moreso, it was actually Lampshaded in the movie a Stitch in Time, where kindergarten Ron made a complex speech. Word Of God actually suggests that he may have repressed his genius so as to fit in better.
- He channels negative emotion into action alot better than positive happpy emotion. Taking over the world is a negative emotion. He also channels his powers when someone hurts Kim. He just does alot better when in angry mindframe.
Another Applied Phlebotinum instance is Rhinox being turned into a Predacon in the Transformers: Beast Wars episode "Dark Designs". He's an ideal minion on the surface, but beneath it, he's cunning, capable, and extremely aggressive, quickly taking it upon himself to create chaos in a takeover bid, which almost works until Megatron applies Reverse Polarity to the Applied Phlebotinum just in time to keep Rhinox from finishing him off. Good thing for Megs that Evil Rhinox just had to gloat like any other bad guy would have, huh?
- Another example involving Rhinox shows up in Beast Machines when it was revealed that Tankor, The Brute tank that had been hounding the Maximals all season was really Rhinox in a sort of Brainwashed And Crazy situation. Sadly things got even worse after Optimus Primal freed him from Megatron's control and he turned against his former allies and started a Xanatos Gambit to take over Cybertron.
- Some poor, misguided fools seem to have heard that G1 Grimlock is capable of combining with the Dinobots to create "the Beast," a terrifying titan of destruction and primal rage. These people are damned liars. Or at least, weren't aware that the sheer suckitude of that Story Arc was so much that Unicron and the Autobots teamed up to wipe it from space and time.
A more literal form of this is The Batman version of Clayface. Just using his powers turns him insane and monstrous.
In Earthworm Jim, whenever Jim's puppy sidekick Peter is injured, he turns into a hulking, ravenous mutant whose sole goal in life seems to be beating Jim to a pulp. In a joke inversion, Peter's Evil Twin is evil when "normal", but his psycho mutant form turns out to be good.
The 2006 revival of Biker Mice From Mars has Stoker turn into an insane rat-like beast called Stoker rat.
An episode of Mr Meaty had Parker (who is normallly calm under pressure due to the fact he just blissfully takes all those insults people kept throwing at him in) turn into a Hulk-like monster due to being unable to hold all those insults in any longer.
Avatar The Last Airbender. Granted, the Avatar State isn't evil per se, but it is also very uncontrollable and violent. The main character never kills anyone unless he is in the Avatar State. Also subverted a little bit in the 3rd season when Zuko executes his Heel Face Turn and sees a significant powerdown in his firebending as a result of no longer being constantly angry. Then he and Aang meet a few dragons and suddenly Zuko's firebending is more powerful than it ever was. He found the good method of channeling.
Sari gains one in the season 3 premiere of Transformers Animated, though not neccesarily evil, per se, just uncontrollable.
In an episode of The New Adventures of Batman (the one after Batman The Animated Series), Batman inhales an anti-fear toxin made by the Scarecrow. As a result, Batman has no fear. NONE. At one point, Bruce Wayne (that's right, no disguise) infiltrates some facility and has to deal with a moat with an alligator or crocodile. He walks through the moat, becoming completely submerged. While still under water, sends the animal flying from the moat and continues on his merry way.

Close Western Animation

The nigh-mythical Norse berserker rages, an adrenal and psychosomatic overclocking which gave one the ability to ignore mortal injuries but removed one's ability to distinguish friend from foe. The less brave soldiers simply drank a lot of alcohol.
- However there is little consensus as to how effective the rages were, or if they even existed, some historians attributing these accounts to overwhelming fear of the Norseman, a likely scenario considering the Norse's tendency to attack and loot monastaries (being non-Christian and thus seeing no importance in them other than being very wealthy), which was the feudal equivalent of crossing the Moral Event Horizon.

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