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  • Urd of Ah! My Goddess (at least in the anime). She has a divine father, a demon mother, and the demon half is scary when it gets loose. She nearly destroys a Power Absorber, which can one-hit knockout some fairly powerful angels, goddesses, and demons.
  • In Air Gear one of the strongest members of the protagonist's team has a split personality. Although Agito isn't exactly evil, his aggressive, bloodthirsty behaviour and great skill at the series' title sport make him this to Akito, one of the gentlest characters in the series. Additionally, later on Agito/Akito discovers he has a third personality named Lind who embodies this trope. He's the polar opposite of Akito and is implied to be much better at Air Gear than Agito. Although his intentions are still largely unknown, Agito himself warns the protagonist that Lind will probably end up becoming the main personality and betray him.
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  • In Anpanman, Rollpanna is already a superheroine, but with two hearts: a good one and an evil one. Being under the influence of Baikinman or being near Anpanman triggers her evil heart, which powers her up even more, but she can break out of it when by her younger siblings, Melonpanna and Creampanda. Sometimes, Baikinman uses dirty tricks to completely remove her good side, turning her into Black Rollpanna, a ruthless fighter that is even more powerful than when she has both hearts, and nothing stops her, not even her siblings, until both hearts are together. For these reasons, she prefers to wander the earth alone, in fear of her evil heart being triggered.
  • Eren from Attack on Titan can become a Titan whenever he bites his hand. However, since the power of a Titan isn't easy to control (most of them are mindless ravaging beasts, after all), this tends to make him more Chaotic Neutral than Chaotic Evil like the regular Titans who eat people For the Evulz.
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  • Bakugan: Masquarade is revealed to actually be Alice, the Friend to All Living Things and Nice Girl of the main team. A Jekyll & Hyde complex was created do to being around her grandfather's laboratory at the time of an experiment that released powerful negative energy into the area. Masquarade is a cruel, sadistic, and incredibly powerful and strategic Brawler that plagues the main cast constantly; Alice is a Non-Action Girl that acts as a Pacifist, wishing to avoid fighting altogether. This is also a case of Gender Bender. There ultimately is a Split-Personality Merge, with Masquarade occasionally appearing as a vision to help advise Alice in battling, and Alice going on to become an Action Girl (who still keeps her Nice Girl personality).
  • Dark Schneider/Lucien in Bastard!! (1988). 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.
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  • Defied in Black Clover. Asta is caught in dire straits the demon within his anti-magic sword attempts to tempt him into letting it take over with its power. Asta promptly tells it to suck it and punches the demon out to claim the power as his own, entering a demonic form called Black Asta. That said, when overcome by malice in his Black Asta form he's covered in more Anti-Magic and his powers are strengthened, playing this straight.
  • Black★Rock Shooter (who is already not the nicest person out there), after killing Dead Master the instant Mato enters her body, becomes Insane Black Rock Shooter. IBRS is a lot more powerful and has better gear, but seems to hold Mato's happiness above literally everything else. And yes, that means she's willing to destroy the entire Other World, subjecting everyone else to the full effects of irreparable psychological trauma. Not to mention she never holds back, even when faced against Mato herself in a Black Rock Shooter avatar. And sure, you could say, "well Mato wanted to be hurt instead of BRS", and you'd be right, but that doesn't excuse IBRS from the downright crippling injuries she gives her with full knowledge that Mato cannot eat up as much pain as an Other Self. Long story short, when BRS is insane, you do not want to mess with her.
  • 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.
  • Beyond the Boundary: Akihito loses control of his youmu side after sustaining severe injuries. He is immensely powerful in this state, requiring 3 people just to contain him. One stray fireball creates an enormous explosion when it hits a nearby mountain and he levels his surrounding area.
  • Bleach: Ichigo's inner Hollow is initially an extremely powerful, violent and monochromatic version of Ichigo. He ends up training Ichigo in how better to harness his Hollow and Shinigami power, but Ichigo has to beat him into submission to do it, or risk becoming a monstrous battle-frenzied Blood Knight as the price of power. Eventually, he learns how to harmonize with his inner power and can achieve his full potential without any loss of sanity and humanity.
    • ...Which didn't help against Ulquiorra, which released the Evil Side after quite a massive upgrade, as he completely crushes Ulquiorra. This is actually a second Superpowered Evil Side. While Ichigo's inner Hollow is frenzied and vicious, it's capable of coherent speech and (often quite unorthodox) tactics. The new form he assumes against Ulquiorra is a single-minded, brutish but immensely powerful Berserker who mindlessly attacks everything in his path other than the person Ichigo had been focused on protecting at the time he transformed...even his other friends aren't safe from it.
  • In Brave10, it turns out the sweet naive miko Isanami is the vessel for the Destroyer Deity Izanami.
  • In the series A Certain Magical Index, the main character Touma is shown to have an actual sentient being inside of him that appeared after having his arm cut off. The guy who cut off said arm had an Oh, Crap! moment when he realised that his power paled in comparison even though he reached the point of being higher than God. Note that Touma's name can alternately be read as "Invisible Demon Above God".
  • Change 123 demonstrates why, in the real world, this is less of a cool new power and more of a deadly serious problem; you don't want your high-school girlfriend to snap and try to kill someone on your behalf because they said nasty things about you...or to try to kill you because you tried to stop her from killing that person.
  • Played with in Chobits. Robot Persocom Chi has a personality living inside her called Freya. Freya always wears darker clothes, sports far less innocent expressions than Chi and is the one to take action to defend Chi when others threaten her. She's not evil, just less innocent than Chi and the holder of the answers to many mysteries of the series.
  • The eponymous warriors of Claymore constantly run the risk of becoming "Awakened Ones" when using their powers. In that state, they become their Super-Powered 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 retain some control after completely transforming.
  • Wretched Egg is this to Shiro in Deadman Wonderland. Shiro is a nice teenager while Wretched Egg is super-powered and incredibly murderous. Subverted near the end when Shiro reveals that both personas were a lie. She's in control either way and is really a Death Seeker.
  • In Delicious in Dungeon, Falin was a powerful mage anyway, but her Lunatic Magician controlled chimera form is on another level altogether. Makes sense as she now has the strength of the Red Dragon added to her own.
  • Akira Fudou and Amon from Devilman may be the oldest example in the history of manga. And also an Unbuilt Trope, as the manga shows that having one wouldn't just conveniently let you send it out on enemy too strong for you to take — taking Amon's powers changes Akira from meek and gentle boy into complete Blood Knight and that even without letting Amon out. Amon however only breaks free in a Spin-Off manga AMON, and an OVA of the same title. In the anime Amon eats a little girl alive and in the manga he is maybe just a bitter Anti-Hero, but still destroys several countries, just by passing through them.
  • Digimon has a few examples of this:
    • In Adventure, Taichi tries to force Agumon to evolve to perfect, causing the creation of SkullGreymon.
    • Digimon Tamers has Megidramon formed when Takato watches Leomon die, who is so powerful the Digital World starts collapsing.
    • Digimon Frontier Koichi spends about half the series as his Superpowered Evil Side Duskmon/Velgemon before it's revealed that he's Koji's brother and gets his Digispirits purified to Loweemon/JagerLoweemon. He never seems quite as powerful after returning from the The Dark Side.
    • In Digimon Data Squad, Marcus' emotion get the better of him, too, forcing ShineGreymon to enter ruin mode.
    • Digimon Fusion has two examples — DarkVolumon for Ballistamon and the Whisper virus for Apollomon. Surprisingly enough, Shoutmon averted this by having no "evil" powered side.
    • Digimon Adventure: (2020) has this happen to Agumon again, but for his Mega evolution when his partner gets too furious in his desperation to protect his friends from DoneDevimon, Digivolving him to Machinedramon.
    • Digimon Ghost Game has GulusGammamon, who Digivolves after Bokomon's death. He immediately kills Sealsdramon and almost does the same to his friends before returning to normal. Unlike the previous examples, GulusGammamon is formed from Gammamon's own feelings of anger and becomes an intelligent and sadistic killer instead of a mindless monster.
  • Son Goku of Dragon Ball faced this early on with his Oozaru transformations. In this form, he loses all sense of self while gaining immense strength and size; the best solutions found were to either cut off his tail or blow up the moon. The transformation into the Oozaru, while generally a bad thing, did have two positive outcomes. One was the escape of Goku and friends from Emperor Pilaf; the second was Gohan defeating Vegeta... by landing on him.
    • Dragon Ball GT takes Oozarus Up to Eleven when Goku transforms into one as a Super Saiyan. Think a giant raging ape is bad? Try a giant raging Super Saiyan ape. Though Goku's able to come to his senses, which sparks his transformation into a Super Saiyan 4.
    • The Super Saiyan state acts like this without proper training. The transformation occurs in a moment of pure rage, and the resulting personality shift leaves the Saiyan struggling with an overwhelming anger. In the Cell Saga, Goku and Gohan train in order to resolve this issue, making Super Saiyan as natural and comfortable as possible so they can maintain it without extra effort as well as retaining their own personalities.
    • Frieza even comments on this when Goku beats him around as a Super Saiyan. He asks if Goku isn't being as cold blooded as he is, and concludes that Goku is still struggling to control the rage in him and that it's uncertain if he will win.
    • Son Gohan's Super Saiyan 2 form is a truly chilling example. It is more than a little disquieting to watch the kindhearted and sensitive little boy we have come to care about over three sagas turn into a gleefully cold-blooded sadist when he achieves the Messianic power of Super Saiyan 2.
    • In the Buu Saga, Vegeta falls under Babidi's mind control, becoming Majin Vegeta. However, it turns out that Vegeta is Not Brainwashed: he let Babidi put him under the wizard's "control" for the power boost that comes with it, and is perfectly capable of ignoring Babidi's commands (because they distract Vegeta from the reason he did it in the first place: fighting Goku).
    • In Dragon Ball Super, we have Kale, a Saiyan from Universe 6. Her "Super Saiyan Beserk" form is just as violent as Broly's Legendary Super Saiyan form. Cabba could barely survive and Caulifla had to bail him out.
    • Surprisingly, Broly is a downplayed version of this, as when he turns Super Saiyan and loses all his sanity, he is more like a feral beast than a raging psychopath, even fighting with himself to avoid killing somebody.
  • 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 Arystar Krory, although he has less of a Super-Powered Evil Side than a Super-Powered Deadpan Snarker badass Side.
    • There's also the Noah, although they're (affably) evil to begin with.
    • Allen, with the Fourteenth Noah who is now making himself heard in conversation, if only to mess with the Millennium Earl's head. The Fourteenth hasn't been seen in actual combat yet, so "superpowered" may still be in question (yeah, right), but his brief awakening in Allen is enough to terrify a Level 4 akuma and his ability to make Allen display a truly nasty Slasher Smile definitely hints at the evil part.
      • In the most recent chapters, after Kanda stabs Allen and awakens his Noah side, there are clear hints that the Fourteenth is terrifyingly powerful, even by Noah standards. Remember, this is the guy who apparently by himself managed to kill off nearly all the previous incarnations of the Noahs and severely injure the Millennium Earl several decades ago, to wit his laughter after having just woken up is mistaken for a minor earthquake.
  • D.N.Angel:
    • Satoshi has Krad, one half of an extremely powerful artwork who likes killing people, living in his head.
    • Daisuke has Dark, the other half of the same artwork, living in HIS head, although Dark's more mischievous than evil.
    • Krad's fandom nickname: Homicidal Blonde.
  • 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 fit this trope to a tee.
    • In the manga, we learn that Lucy — or rather, Kaede — is actually more of a superpowered neutral side, who's been listening to and partly controlled by a completely insane Omnicidal Maniac third personality (created by either her Diclonius instincts or by snapping as a result of the torment inflicted on her when she was young, whichever theory you prefer) that wishes to annihilate the entire human species, if not all sentient life.
  • Vincent Law's proxy form is initially presented as this in Ergo Proxy. As the series progresses, it is later revealed that "Vincent Law" is just the alias for the Proxy of Death: Ergo Proxy
  • Brain from Fairy Tail has Zero, who is twice as strong as him and far more adept in combat, being credited as the true master of Oracion Seis. He's so dangerous that Brain sealed him away with special keys that link all the members of the Oracion Seis, and he emerges when the Oracion Seis are all defeated to finish what they started.
    • Also Rogue, whose magic causes the darkness in his heart to manifest as his shadow, tempting him to do evil and even possessing him once to give him a power up and try to force him to kill.
    • Natsu, as it turns out, is the true identity of E.N.D., the most powerful demon ever created by the Big Bad, Zeref. While not much else is known about him, its indicated that even the dragon Acnologia is leery of him, which no doubts says a lot about E.N.D.'s power level.
  • 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.
  • 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."
  • Kagura, the adorable, profane, sukonbu-chewing, nose-picking heroine from Gintama can go into this when the self-imposed chains on her Yato blood get broken. She stops fighting to win and instead fights to kill with a savagery that scares her.
  • Green Worldz: Akira, the survivor most of the story has focused on so far, has a darker personality hidden within him that tends to come out when he's at a crossroads and pushes him to survive and adapt to their post-apocalyptic world, even if doing so sometimes requires him to do unethical things.
  • 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 Hellsing, Seras Victoria's berserker mode could be counted as her Super-Powered Evil Side.
  • In Heroic Age, the giant mech-like warriors of the Heroic Tribe, called the Nodos, can eventually let out a Super-Powered 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. Then he begins leveling whatever galaxy he's in at that moment, before moving on to another area.
  • The main character of Ikki Tousen, Sonsaku Hakufu, is a token Idiot Hero with enough fighting skill to beat the crap out of a school attended only by martial artists and assorted thugs. But sometimes the enemy is just above her level and she finds herself beaten almost to death: vision blurs, strengh fades... Congratulations! You've awakened "the power of the dragon" and the last thing you are likely to see is her raptured expression, while she strangles you to death or is about to stab you with a sword. To be honest, everyone possessed by a dragon soul behaves this way... even if not a fighter — the biggest example is Gentoku Ryuubi, a Butt-Monkey Cute Clumsy Girl who happens to possess a Dragon Soul even more powerful than Hakufu's, and when taken over by it she becomes a totally savage Person of Mass Destruction.
  • The "berserker spirits" aka The Dragons from Ikki Tousen. So far, we have four dragon holders: Hakufu, Ryuubi, Sousou, and Ryoumou
  • Inuyasha:
    • Inu-Yasha's demon side, 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. His Empathic Weapon Tessaiga acts as a Restraining Bolt. Subverted in that eventually Tessaiga itself is so powerful that his demon side is actually weaker by comparison. (He was in fact given so powerful a weapon so he wouldn't need to rely on his own demon powers.)
    • Suikotsu of the Band of Seven is a doctor with Split Personality whose darker side is a sadistic, blood-thirsty murderer. It turns out that this is his true self, as well: he'd been good, gotten a taste for battle when defending his village, and became a mad killer of his own free will. The purifying effect of the mountain the story takes place on lets him revert to the decent man he'd once been.
  • 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.
  • In Jujutsu Kaisen, Itadori has Ryomen Sukuna, the strongest cursed being, as his super powered evil side. Itadori's journey is about getting and consuming all of Sukuna's fingers, so that he can hold all of Sukuna within him and be executed, destroying him once and for all.
  • Kagerou Project: Konoha, Super-Powered Alter Ego for Ill Boy Haruka Kokonose, is a downplayed example. While he is in fact a very caring individual — like the real Haruka — it is noted by other characters that despite noble intentions, he uses his powers to solve problems with violence and destruction. Not to mention that he's a Demonic Possession away from being used to massacre every other main character, and does so every few thousand years.
  • In Kamigami no Asobi, Baldr, the God of Light has one, as the God of Destruction. And Loki, who loves him, will have to kill him to prevent his evil side from destroying the world.
  • 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. She's right. When he's in this state he's basically letting his anger and pride control him (something he had often warned others against), lacking the ability and focus that he'd shown in the rest of the series. This fight is also the first time that she gets the best of him, first calling him out for his behavior, then landing a solid hit that knocks him off his feet.
  • When Yuuri 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.
    • ...who almost always says he's going to kill people, even though he 'dislikes bloodshed', but has no confirmed kills, and is usually confirmed as not having hurt anyone. Once he sentenced an Unlucky Childhood Friend and her quarry to go on a date. Another time he mistook an assassination attempt for an earthquake and saved everybody, even the enemy soldiers who'd been trying to kill him. Also, he has been known to say nonsensical things about fire brigades etc., just like Yuuri always does, just in a serious, booming way.
    • In the manga he gets a lot closer to the 'evil' line, but is a lot less divorced, in terms of identity, from normal Yuuri, whose lifelong tendency to a really violent temper is underlined. But the manga is darker than the anime. And Yuuri accidentally stabbed Wolfram half to death a while back in the novels. Genre Woobiefication?
  • Ryner Lute from The Legend of the Legendary Heroes is lazy but if you hurt one of his friends, you will see why Alpha Stigmas are feared: an evil God of Destruction personality with overwhelming powers will just disintegrate you.
    Ryner Lute: First comes destruction. I bring forth nothing. I bless nothing. I save nothing. I just erase. Completely.
  • In Magical Project S Misao is normally a shy, physically weak and powerless girl, but when she transforms into her evil side, Pixy Misa, she becomes super confident and super competent. At full power she is able to easily defeat the heroine Sasami.
  • Tohma in Magical Record Lyrical Nanoha Force has his Black Knight form. When it comes out, he gains a Healing Factor, powerful magic, and is capable of performing a Zero Effect, which greatly drains the energies of anyone and anything in a wide area. Unfortunately, he loses over half his consciousness in this form, replacing it with an insatiable need to kill.
  • 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 Super-Powered Evil Side that can uproot trees and use them as weapons.
  • In Mobile Suit Gundam SEED, Andrew Waltfeld seemed to likened SEED Mode to berserker rages of the Vikings. While it's not an actual Super-Powered Evil Side, activating SEED Mode while enraged is certainly a glorious mess.
  • While not necessarily "evil," a mechanical version of this can be found within Mobile Suit 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 Ax-Crazy. Given that they're still inside a giant, city-killing death machine with all their piloting skills boosted, results are predictably messy.
    • The Zero System can be used safely: the pilot must keep a clear head and not be conflicted in his thoughts towards the battle. In this case the pilot then gains all the benefits without the insanity. Both Heero and Zechs reach this point in the end — and, in fact, Heero eventually becomes so relaxed about the obligatory in-cockpit Mind Rape that he starts offering it to his fellow pilots as therapy. Astonishingly, it works.
    • Mobile Suit Gundam 00 also has fun with this — Allelujah Haptism has a Split Personality: Hallelujah, a blood-thirsty "warrior" half who is more skilled than any other pilot in Celestial Being. Then subverted with The "Ultimate Soldier", aka H/Allelujah or Doublelujah, who's an even better pilot and integrates the best parts of both personalities, including Allelujah's morals.
    • In the Gundam 00 movie his mech, the Harute, gets one of its own called Marute.
    • From Mobile Suit Gundam Unicorn, there's the Unicorn Gundam. Normally a high performance mobile suit with generally above average statistics but nothing of any particularly remarkable quality, when the pilot and it come into contact with a Newtype enemy and the pilot feels a strong enough emotional pull (usually anger), the Gundam feeds off of it and transforms into the eponymous Unicorn Gundam, now in its "NT-D" (Newtype Destroyer) Mode. Its speed ramps up significantly, its strength seems to increase, it gains new abilities related to its psycoframe, and worst of all the suit's AI will stop at nothing short of a manual override or a Heroic RRoD to kill any Newtype in weapon range. This is entirely not good for anyone who happens to be facing the thing down, as it generally goes from on an even footing or slightly underperforming the enemy to stomping their face in on a one-sided epic beating. After falling victim to this once or twice, Banagher learns how to consciously activate the NT-D system and override its AI, leaving him in complete control of the suit.
  • Mob's ???% form in Mob Psycho 100 comes out when Mob falls unconscious, and is not only far more powerful than Mob at even 100%, but is also far less restrained in how it uses that power — though, as a defense mechanism, it doesn't seem actively malicious.
  • Piss off the softspoken, easygoing and always smiling Wolfgang Grimmer, from Naoki Urasawa's Monster, and you'll have to deal with "The Magnificent Steiner". Carnage ensues — though it's never directly shown. This is how his psyche deals with the experiments done on him when he was young, and is the best result of the known survivors.
  • Naruto:
    • Subverted where Jinchuriki can attain great powers due to being linked to their Tailed Beasts. However, only Naruto and Gaara are explicitly shown using this trope due to their Dark and Troubled Past, as while all the other Jinchuriki can use their Beasts abilities easily, these two just lose it, manifesting when either are emotionally distressed or when their lives are at stake. Both manage to reject or tame these circumstances, and the latter turns his into a Super Mode. It turns out that Tailed Beasts are just as intelligent as humans, and while they can be subjugated by a strong host, the key to fully utilize their power is to befriend them and become a team that shares a body.
    • Sasuke and the curse mark. During the Chunin Exams arc, Orochimaru gave him a curse mark, which, once activated, turned the quiet, elite loner into a sadist who broke a guy's arms without a second thought. Creepy!
    "You seem quite attached to these arms of yours."
  • In Negima! Magister Negi Magi, it seems that the "Encroachment of Magia Erebea" is causing Negi to develop one of these. Played with in that when he learns that the Super-Powered Evil Side is a product of the Magia Erebea turning him into a demon and that there's no known way to stop it, rather than decide he'll figure out a way to seal it away permanently, he instantly, without hesitation, decides to get the whole demonic conversion process over with right now and get it out of the way. Technically he agreed without fully understanding how it worked, and Eva just kickstarted the process. Given that the alternative is well, the same thing only over a longer time period, and that the point of the conversion is to get the Super-Powered Evil Side under control, it was really the only viable option anyway. More like a Super-Powered Dark Is Not Evil Side, really.
  • Koyori in Nurse Witch Komugi has a literal evil Magical Girl Split Personality that she is completely unaware of.
  • The main character of O-Parts Hunter 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 trying to take over but some are incredibly vain and judgmental.
  • 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.
  • One Piece has Chopper, a shapeshifter who, as with all Zoan Devil Fruit users, normally has three forms available. When he eats a Rumble Ball, he gets access to four more forms for three minutes. If he eats another before the six-hour cooldown wears off, he gets three more minutes, but the shapeshifting is uncontrollable. If he eats a third, he morphs into a giant monster that's incredibly powerful, incredibly resilient, and absolutely uncontrollable. In its first appearance, he one-shotted an enemy who had been beating him handily a moment before, then smashed through a castle wall and went on a rampage, destroying a dozen rooms before Franky managed to throw him into the ocean. Chopper masters this form during the timeskip (now officially called "Monster Point"). He can use it by consuming a single Rumble Ball and retains full control, but is still too exhausted to move afterwards.
    • In the kingdom of Rommel, there was a phenomenon where it seemed as if the wind itself was cutting people. Eventually, a Marine warship was sent out to investigate, and the culprit was found to be a man by the name of Hakuba. Even to this day, he still hasn't been caught, but he still appears in towns where a certain pirate resides. The pirate in question? Cavendish. In fact, Hakuba is the one who went out to sea to become the pirate named Cavendish.
  • Pikachu in the Pokémon: The Series anime practically turned into a demon when he was possessed by Groudon.
    • Korrina's Lucario goes absolutely berserk after gaining the power of Mega Evolution because it can't control the aura that's unleashed. Eventually ,it learns to control its power.
  • 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 a helicopter division, numerous other ARMS, emitting fire, and much, much more, said much, much more means he makes anti-matter on a whim later on in the manga. Oh yeah, and it evolves too.
  • In Radiant, Piodon removing the bandage on his cheek lets Seth access his Berserk Mode, turning him stronger at the cost of becoming feral and unable to differentiate between friend or foe. He gains some control over this form after training with Myr.
  • Orson from Record of Lodoss War is a Berserker Class and, when he gets angry, with the influence of the demon Hyuri he becomes an unstoppable killing machine that wields a massive claymore as if it were a toothpick.
  • The Rising of the Shield Hero: Due to the sheer amount of severe injustices thrust upon Naofumi right at the start of his so-called "Heroic Journey", resentment has accumulated into him evolving from his former jovial-self to his internally-armored/cold untrusting-self, eventually having him unlock his Curse Shield (complete with crimson eyes) which not only lets him unleash his hatred upon those who wronged him, but to everyone else as well, as he attacks indiscriminately when he completely gives into it, and was close to becoming a very deadly Hero-turned-villain, just as everyone accused him of from the beginning... if not for his true comrades who were there to snap him out of it before he could delve even further into its madness-imbuing embrace. If that wasn't enough, the soul of the Zombie Dragon he slew earlier with the help of his party members now resides within his Curse Shield, tempting him to give into his unfettered hatred and rage completely whenever he unlocks a new depth of its dreaded curse-fueled power.
  • Moka's "super-vampire" side in Rosario + 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.
    • Though recent chapters have revealed that Inner Moka is the true personality of the one body and the Outer Moka was created when Moka's powers were sealed by her mother's Rosario so she could go in to hiding. Outer Moka's personality is actually based on her mother Akasha's personality.
    • Tsukune's ghoul transformation is much closer to the trope. He requires a power limiter like Moka to keep it under control, but unlike Moka, he's a complete monster without it, and only monster of a similar/higher level to Inner Moka stands a chance against him, unless he really cares about them like his friends. As of Chapter 41 it seems he's at great risk of becoming a second Alucard.
  • 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 Battousai, 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, Battousai seems to be considered an actual personality Kenshin has learned to seal off by creating his rurouni persona — he has to 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.
    • It's an unusual case, as in his current state Kenshin is actually much stronger than when he was the Battousai, having fully mastered Hiten Mitsurugi Ryu, including learning its ultimate technique, in the intervening years. But as the Battousai, he never held anything back, always going for the immediate kill. If he didn't stop himself every time the Battousai persona tried to emerge, though, he'd combine his increased strength with his former ruthlessness to become a near-unstoppable killing machine.
  • 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.
  • Sailor Moon:
    • Hotaru Tomoe has two other sides. Sailor Saturn and Mistress 9, who nearly destroyed the world. Hotaru also subverts this trope. Sailor Saturn's breed of destruction is basically a cosmic Reset Button — albeit one that's only marginally better than outright annihilation. Mistress 9, on the other hand, is desperately weak; the Deathbusters' scheme in the second half of the season boiled down to saving her before she (and Hotaru) curled up and died.
    • Also Chibi-usa, who had one as well when she was brainwashed by the Wiseman, known as the Black Lady.
  • Saiyuki:
    • Son Goku. 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.
    • Cho Hakkai's youkai form would normally just be a Super Mode, but when he changes into it he risks slipping into this due the Minus Wave that is sending youkai berserk. (And consequently, he doesn't pull it out unless the situation is beyond dire and it's time to set his usual nice-guy facade aside, meaning that even without the Minus Wave there's going to be blood on the walls when he's finished.)
  • 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.
  • Lina from Slayers when she's possessed by the being that accidentally created the universe and was presumed to be ready to undo it just as willingly. However, it is instantly subverted as it chastises the villain that made Lina fall to it and unmakes only him and all his plans. Her actual motivations are stated to be simply alien to our moral scale.
  • In Sonic X, absorbing the energy of a 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.
  • 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 "Super-Powered 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 only a temporary setback.
    • While not anywhere as drastic a change as the above, 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.
  • In Steel Angel Kurumi, at least the anime version, it's revealed that Kurumi's Angel Heart Mk. II has both an angel and a demon in it. Thanks to Nakahito commanding Kurumi not to hurt people, Kurumi finds herself helpless during fights because she doesn't want to hurt anyone, especially her fellow Steel Angel sisters. The demon side manifests soon after, Blank White Eyes, grim demeanor and the ability to punch holes into walls from a distance. When Nakahito's kidnapped in an attempt to find out why his power makes Kurumi stronger, she starts to freak out and slip farther and farther into this power until everyone is forced to use a last-ditch weapon to kill her. Thankfully, Nakahito's able to break through to her and True Love's Kiss ends up purifying her heart.
  • Double-subverted (at least) in Super Taboo with Yuu turning into "Instinct Yuu," which is less Omnicidal Maniac and more the personification of All Girls Want Bad Boys that's initially desired by his mother and sister since that side awakens whenever he's sexually aroused (minus everyone being drunk on Christmas) and implied to be inherited from his father, whose voice is even mesmerizing enough for Up To Eleven Phone Sex with his wife. Other than the confusing blackouts and reactions to sleeping with various women it/he's harmless until getting too rough with his sister, requiring a Battle in the Center of the Mind where Reason and Instinct (previously just a running gag where Instinct curbstomps Reason in cartoon-form ex. Barney-like dragon eating a knight) are personified as a Betty and Veronica that he has to choose between despite Evil Is Sexy. He finally chooses to be with Reason and rewarded with one last shot at his mom as himself (who's somehow a virgin) before being more steady with his sister as a happily ever after.
  • In UFO Baby, you can see a crystal-clear example in Christine, the older Hanakomachi... when a girl (human, alien, it doesn't matter) approaches her beloved Kanata in a remotely romantic way, she emits a black aura and her eyes glow: it's your cue to get away. In such a state she is capable of feats like lifting trees & breaking concrete walls. She's not evil, just clingy.
  • This short cartoon about an anthro clione, whose SES is based on his real-life counterpart's mouth. The sequel stars a female version with a dash of Tsundere.
  • The protagonist of The Three-Eyed One, Hosuke Sharaku, is a tiny, wimpy, Charlie Brown-esque boy who turns into an immensely powerful, larger, psychic supervillain when the bandage on his forehead is removed, revealing his third eye.
  • Vash the Stampede's eponymous weapon in Trigun is triggered involuntarily by such events.
    • There is less "evil" here than "Evil Twin pulled the trigger" or occasionally "moment of Unstoppable Rage." Vash has never shown a Super-Powered Evil Side, although he does have the related tropes of Crouching Moron, Hidden Badass, an Evil Twin, and the occasional burst of aforesaid temper, after he witnesses a massacre or something else heinous.
    • Livio from the manga plays it more straight, actually having a split personality.
  • Trinity Blood: Father Abel Nightroad only looks like a bumbling idiot most of the time — in reality, he's an extremely powerful and extremely dangerous Crusnik, a super-vampire that preys on regular vampires. He voluntarily limits his power to 80% activated, at most, though, although he does suffer from Sanity Slippage at that point. His brother, Cain, was driven to insanity by fully-activating his power, so yeah, that voluntary Power Limiter is actually a good thing.
  • Vampire Hunter D: Dhampyrs (human/vampire hybrids) can 'vamp-out' under physical and/or emotional stress and start exhibit Noble-like traits such as drinking blood, etc. Given how powerful D is when he's trying to act mostly human, when his Noble side emerges, expect plenty of Oh, Crap! moments and Curbstomp Battles.
  • Sumire's Anti-Virus mode (called "Berserker") in Venus Versus Virus. It's brought on by being shot by a special bullet. Berserker Sunire is supposed to only hurt Viruses however she is attracted to Lucia as well.
  • In Violinist of Hameln, Hamel's mazoku blood gives him a Super-Powered Evil Side that, however, is not usually activated by rage or being near death, as it usually the case, but instead takes over whenever he cannot carry on anymore and is close to Heroic BSoD. It comes with demonic physical changes, such as horns and wings, is powerful enough to easily devastate whole cities, indiscriminately murderous and completely uncontrollable until the final battle, when Hamel managed to stay in control despite the full-body mazoku transformation, because that time he fought for his friends and love and only transformed because the Big Bad's power level was high enough to warrant it.
  • In X/1999, Big Good Hinoto is shown to have one of these, who wants to unleash The End of the World as We Know It to become the only Dream Weaver. When the manga was given a No Ending, her Dark Self has completely taken over her. This is dealt differently in the TV series, where Hinoto goes through an Heroic Suicide to stop said Dark Self.
  • When Yaiba loses control of the Raijin Sword he turns into a lightning-blasting, destructive avatar of the God of Thunder.
  • 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 initially a Good Is Not Nice antihero who will dole brutal punishments out to the Asshole Victim of the week, the severity usually varying by threat but always a terrible Mind Rape at the very least. Word of God is that this due to millennia of imprisonment, but Character Development and the influence of Yugi and co. put him in the Good Is Not Soft category. This may have been the result of Yu-Gi-Oh!! being planned as a horror series and Yami Yugi being a straight split personality originally. This trope comes into play during the Doma filler arc of the anime, when Yami Yugi showcased his vengeful, darker side.
    • Judai (Jaden), Fubuki (Atticus), and Kaiser (Zane) in Yu-Gi-Oh! GX... except Kaiser doesn't gain an evil side as much a new evil persona.
      • Fubuki is possibly unique among this trope in that he has, twice, purposely assumed it, and had a rather good reason both times (well, good in his view, maybe). The first time he thought it might bring Kaiser back to his senses, seeing as he thought Kaiser might have been under a similar curse. (It didn't work, seeing as that was not the case.) The second time was due to his feeling that bringing Darkness (Nightshroud) back was the only way to answer the questions tormenting him.
    • Displayed in Yu-Gi-Oh! 5D's with the Dark Signers. Most of them became evil due to Blatant Lies told to them by the Earthbound Gods, and most came to their senses before it was too late. Aki (Akiza) is another example, although a Heel–Face Turn in her case didn't cause her to lose her powers. (In fact, it actually made them more benign, eventually.)
    • Yuya and his counterparts of Yu-Gi-Oh! ARC-V have what is known as "Awaken", in which their eyes glow and they become enraged and battle-thirsty in order to win a duel. Yuya develops one after absorbing his alternate dimension self, Yuto. It comes with glowing red eyes, a Creepy Monotone voice, and Major Injury Underreaction to being repeatedly hit with a monster's flamethrower. The persona has given Yuya some powerful cards (notably Odd-Eyes Rebellion Dragon). But the more powerful it gets, the more violent and malicious it becomes.
      • Yuya actually has two established evil sides; Yuto, who while otherwise benevolent, will act on his (completely justified) hatred of Fusion and Academia. The other is an unknown darkness that's trying to take over both Yuto and Yuya.
      • That unknown darkness living that's trying to take control of both Yuya and his counterparts? That's the Devil Duelist, Zarc, whom Yuya, Yuto, Yugo and Yuri all used to be part of, until Ray split him, the universe and herself into four pieces each. Zarc eventually gains full control over Yuya and his counterparts and it's not pretty!
  • In YuYu Hakusho:
    • Parodied when Yusuke dies, and it is revealed that he is in fact part demon. Said demon blood kicks in and he comes Back from the Dead, 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 uses it 'better,' defeating Sensui easily and killing him, which Yusuke is not cool with. Mostly because he wanted to kill Sensui himself...
    • Sensui himself is an inversion of this trope. Of his seven personalities, the strongest one is Shinobu, the original one, and the only one to remain pure and innocent. His Kazuya personality, by far the most violent and sadistic, is the weakest personality shown.
    • 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 too far and reverts him to his previous incarnation as a powerful demon bandit.


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