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Super-Powered Evil Side

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"Jason Blood, born of man
A hidden evil lies within
Spoken verse awakens sin
And frees the demon Etrigan"

"But I'm not my "kind", not anymore — your shadow leeches saw to that. I'm half Toa of Light, half Toa of Shadow. This was what you wanted, wasn't it? Toa consumed by darkness, Toa not hampered by things like mercy or morality. Well, now you can choke on it."
Toa Takanuva, BIONICLE

The fight's not going so well for our hero. He's wounded and at the end of his strength, and his barely scratched opponent looks down at him and sneers. And then the hero somehow suddenly taps into a massive hidden power source within him and unleashes a can of whoopass on his opponent.

It's not exactly the hero any more, though. He's got glowing eyes, some new Facial Markings, a different way of talking, some new threads, and a lot less compunction about ripping someone in half. It's his Super-Powered Evil Side. Think of it as the Enemy Within when it's not the enemy, or as Jekyll and super-Hyde.

Interestingly, notwithstanding the name, this character isn't necessarily evil — he just seems like it because a superpowerful version of a normal person who has no compunctions about randomly destroying things registers objectively as "evil" on most people's scale. To be technically accurate, this is more of a Super-Powered Alter Id — this personality is the physical manifestation of the character's basic drives without having to deal with the inconvenience of higher thought processes and morality — but sometimes this character will have traits of actually being evil or even worse.


Keep in mind, of course, that once the Id is out of the subconscious it's not likely to want to go back in. Thus, the hero faces the very real threat of not returning to normal, each bout of Alternate Identity Amnesia causing him to get more worried about the next. Generally speaking, though, he's usually safe unless he starts thinking Evil Feels Good.

The narrative purpose of having a super-powered evil side is that it provides a way of saving a hero who is otherwise beaten but without making the hero look disproportionately powerful. It answers the question "why doesn't he just do that all the time?" with "because then the evil would take over." Additionally, if it leads to a Face–Heel Turn, it can serve the same purpose as Good Is Dumb in reverse — it justifies taking one member of the Five-Man Band or whatever and making him a match for his entire team while he has given in to evil.


This is the converse of With Great Power Comes Great Insanity, seeing as in this case, with great insanity comes great power.

One possible variation on this trope makes the Evil Side the original personality. This creates the odd situation of an "Evil" super-powerful monster whose "Good" not-as-powerful personality is dominant for whatever reason.

This is sometimes the reason to Beware the Nice Ones. Compare with Crouching Moron, Hidden Badass, Demonic Possession, Jekyll & Hyde and One-Winged Angel. Frequently overlaps with Sealed Evil in a Can and Sealed Badass in a Can. Contrast Heroic Resolve, My Name Is Inigo Montoya, and Helpless Good Side, although that last one sometimes goes hand in hand with this. May be caused by The Corruption. One possible way of Taking A Level In Badass, and in many ways, this is what The Berserker does.

Sub-Trope of Enemy Within and Super-Powered Alter Ego. If the Super-Powered Evil Side is triggered by the character's anger or rage, then it is a type of Hulking Out.


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  • Urd of Ah! My Goddess (at least in the anime).
  • 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.
  • 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.
  • 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.
  • 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!!. 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.
  • 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.
  • 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.
  • 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.
  • Code Geass: Lelouch's Then Let Me Be Evil moment at the end of the second season where he Geasses all of the army guys to become his personal slaves showing if he was to be evil he would be a complete monster. Completed by him taking over the world
  • 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.
  • 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.
  • 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 Super-Powered 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 Savers, Marcus' emotion get the better of him, too, forcing ShineGreymon to enter ruin mode.
    • Digimon Xros Wars 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • 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.
  • 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.
  • In Mahou Sensei Negima!, 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.
  • 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.
  • 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 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.
  • 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.
  • 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, 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, the latter turns his into a Super Mode. It turns out that the 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."
  • 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 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 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 later masters this form (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 anime practically turned into a demon when he was possessed by Groudon.
  • 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.
  • 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" it 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) that not only lets him exude his hatred upon those that wronged him, but to everyone else as well, as it is fully indiscriminate when he completely gives into it, and was nearly becoming a very deadly Hero-turned-villain, just as everyone accused him of from the beginning thought he was... if not for his true comrades 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 slain earlier with 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.
  • Son Goku from Saiyuki. 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.
  • Then 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.
  • 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.)
    • And Yu's (Yuya and his counterparts) of Yu-Gi-Oh! ARC-V have what is colloquially known as Berserk Mode, 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 demon, 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 Yu Yu 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.
  • In Jujutsu Kaisen, Itadori has Ryomen Sukuna, the strongest cursed being, as his super powered evil side. Itadori's journey is all about getting all of Sukuna's fingers so that he can hold all of Sukuna within him so he can be destroyed once and for all.

    Comic Books 
  • Astronaut Brice Rogers became the Moonman after passing through a comet's tail while traveling to the Moon. During the day he was Brice, but exposure to moonlight forced the emergence of his criminal alter ego.
  • Anti-hero (but firmly one of the good guys) Hellhound in Astro City's Dark Ages arc has a huge, colorful demon inside him. When it comes out, well, the demon isn't one of the good guys.
  • Batman:
    • In the Batman R.I.P. storyline, Dr Hurt's mental attacks on Batman unleash a "back-up personality" Bruce had installed in his psyche, known as the "Batman of Zur-En-Arrh", who is essentially Batman without Bruce Wayne, i.e. completely unstoppable, but willing to do things the normal Batman wouldn't dream of to get results (including, it is implied, torture). Once again, more of a "superpowered" (he's still a Badass Normal) Id Anti-Hero side than truly evil.
    • Two-Face is sometimes treated this way, being able to do the nasty deeds that "good" Harvey Dent can't bring himself to. This is particularly evident in the story "Two of a Kind".
    • In an Elseworld story called "Batman/Etrigan: A Tragedy", Bruce Wayne is (unknowingly) the host of Etrigan the Demon, who emerges every night to violently battle criminals in Gotham. However, Etrigan is only as restrained as he is because of Bruce's virtue, and in reality, Bruce has been trapped with Etrigan for over a thousand years, pretending to be his own descendant unknown to himself because his servant Alfred (in reality Merlin the wizard), has kept watch over him and constantly changed his identity for all this time out of guilt of dooming him to an eternity as a prison for Etrigan. Bruce attempts to exorcise Etrigan, but the results are disastrous, resulting in the deaths of Catwoman, Killer Croc, Commissioner Gordon and several police officers, as well as Bruce's fiancee Glenda. Bruce consigns himself to repeating the cycle once more as Etrigan's jailer.
    • In "The Third Mask", a story in the Batman Black and White anthology series, Batman tracks a serial killer with some kind of split personality condition, including an alternate personality who's dramatically muscled and capable of superhuman feats of strength and agility. At the end of the story, Batman manifests his own similar alternate self to confront him.
  • Eclipso has acted as this to various characters in the DC universe. Subverted in one Blue Beetle comic, where Eclipso invokes this by releasing Jaime's darkest fantasy of ultimate power to serve as her champion against Paco. This backfires when this turns out to be a dentist, who is easily defeated. Jaime's deepest desire has nothing to do with power; what he wants is a stable career to help support his family.
  • Wonder Woman (1942): The Silver Age version of the Cheetah, Wonder Woman villain, was the violent split personality of a celebrity, Priscilla Rich.
  • In Daredevil and related comics, Mary Walker is a sweet, innocent woman who has two evil personalities, Typhoid Mary and Bloody Mary, who have sole access to their super powers.
  • Jackie Estacado in The Darkness also fits this, and likes it during the early parts of the series, as it gives him more unique ways to kill people.
  • Doom Patrol has Crazy Jane, a woman with severe Dissociative Identity Disorder, caused by sexual abuse by her father. When the alien Dominators detonated their gene bomb during the "Invasion" event, activating the metagene in thousands of humans, Jane was one of those affected. Jane has 64 different personalities, some good, some bad, and some neutral or inactive (the Jane personality has no powers). Among the evil ones are Black Annis (a violent, psychotic misandrist with blue skin and razorsharp claws and teeth), and "Daddy" (a giant copy of Jane's father made of insects, excrement and puzzle pieces). The Daddy persona was destroyed when Robotman entered Jane's psyche and helped her defeat him.
  • Etrigan serves as this to his host Jason Blood.
  • Star Sapphire, villain and Love Interest of Green Lantern Hal Jordan, was similar, with Carol Ferris being unaware of what her alter ago was up to.
    • The Golden Age Green Lantern also had a villainess who was an otherwise innocent woman's split personality, the first Thorn. Alan Scott would actually end up marrying the Thorn's good side, Rose Forrest, while she was using an assumed name. Unfortunately, the Thorn re-manifested and Rose fled for Alan's sake, and then later had to give up her children to protect them. These children were in fact Obsidian and Jade. Some time later Rose would have another child, Mayflower of the Force of July, but her father was never revealed.
  • 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... possibly. Immortal Hulk makes it a little ambiguous, with the Devil Hulk (an Appropriated Appellation) hating the human world, but being genuinely protective of Bruce and the classic, Savage Hulk, and being downright horrified by the One-Below-All.
    • As well as Gray Hulk and Guilt Hulk — though Grey Hulk isn't really "evil"; he's another closer to "id".
    • Bruce Banner's wife Betty Ross was once transformed into the villainous Harpy. Later she became Red She-Hulk, who's more The Atoner, and currently is the Red Harpy, whose looks and mentality are a mix of the former two.
  • In The League of Extraordinary Gentlemen, Hyde is this to Jekyll. He points out (true to the source material) that this was not originally the case. Quite the opposite: Jekyll was originally a big strapping fellow while Hyde was rather diminutive. The reason Jekyll is a pale and sickly shadow of his former self while Hyde is a big hulking brute now? Without Hyde, Jekyll has no drive, and without Jekyll, Hyde has no restraints.
  • J'onn J'onzz, the Martian Manhunter, has a fear of fire for good reason. When he loses his fear of fire? He unleashes Fernus, the last Burning Martian who beat the entire Justice League of America at once and Batman needed to call Plastic Man in to help. Yes. That Plastic Man.
  • In the Alan Moore Retelling of the comic Marvelman, Miracleman, Kid Miracleman is the only survivor of a nuclear blast (he thinks) and stays in his superpowered form for years. In this form, but using his civilian name of Johnny Bates, he grows up. His moral code begins to erode because he is the most powerful man on earth and he has no one to tell him what to do. When Miracleman confronts him years later, he is the CEO of a computer company and a rather nasty piece of work. They fight, and he is forced to change back into a normal human child (His other self didn't age for years while in stasis) and left at an orphanage. There he is constantly bullied by other orphans, having to carry the dreadful knowledge that he could become more powerful than any of them, but he dare not because KM would start killing people. Then he is pinned one day, and some of the boys attempt to gang rape him, and this pushes him past the breaking point. The resulting awakening of KM results in the slaughter of the boys and a significant number of the population of London. Miracleman is forced to make him transform back into a human and end his life with a Neck Snap. In an apocryphal story called "The Rascal Prince", a book read by followers of Johnny Bates who think he was a tragic victim tells a tale two ways: The revisionist version that depicts KM's meeting with an older woman as a flirty chaste romance, and as the Real Life version depicting the rape of an unwilling victim.
  • The New Mutants 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.
    • Legion from the same series was first introduced with a Super-Powered Evil Side in Jack Wayne, as well as a Super-Powered Jerkass Side (the pyrokinetic Cyndi). He usually has one or more evil personalities, except when they are temporarily merged.
    • His father Charles Xavier also sometimes suffers from this trope. First, in a crossover mini-series with the Micronauts there was the Entity, a personification of his dark side. Later there was the supremely powerful Onslaught, who also contained elements of Magneto's evil side. Then there is Cassandra Nova, who combines this trope with elements of the evil twin and alien invader.
  • In pre-Crisis on Infinite Earths continuity, Stacy Macklin appeared for several years in DC's Wonder Woman series. She made her final appearance in World's Finest, inheriting Moonman's powers and developing an alter ego as Lady Lunar.
  • Raven of the Titans has to maintain strict control over her emotions to the point of being The Stoic. If she doesn't, she runs the risk of manifesting the extradimensional demon side of her family tree and becoming Daddy's Little Villain. This is one of the major reasons Raven and Beast Boy have never been able to make a relationship work in the long run despite strong mutual feelings for each other.
  • Rising Stars:
    • Stephanie Maas/Critical Maas; 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'.
  • 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, and in a slight variation on this trope, the Void is exactly as powerful as the Sentry, and occasionally kills someone for every person the Sentry saves.
    • It was later revealed that the Void exists because before becoming the Sentry, Bob Reynolds was a junkie who broke into a research facility looking for crystal meth and ended up drinking a serum that gave him the powers of the Sentry. He became addicted to that serum and the rush of being an admired and respected superhero, but deep down he was still a selfish, murdering junkie — and this expressed itself through the Void.
    • And later it was revealed that the Void was in fact the Angel of Death. The Sentry is kind of a mess - it doesn't help that he's a fully fledged Reality Warper, meaning that it's quite possible that his backstory genuinely does change whenever he thinks up a new one.
  • Sonic the Comic:
    • Super Sonic. In that comic's canon, the Chaos Emeralds are full of pure evil (as energy), rather than their neutral alignment as confirmed as video game canon by Sonic Adventure. Super Sonic came about by overexposure to the Chaos Emeralds, and as such... he's insane, and evil, sadistic, psychopathic... and equipped with the power of the Chaos Emeralds. When he split from Sonic and lost his powers he mellowed out, but returned to form when he got them back.
    • Doctor Robotnik is also this to his former self Dr Ovi Kintobor, due to exposure to raw evil Chaos Energy.
    • Sonic's Alternate Universe Evil Counterpart King Sonic inverts this trope by virtue of his own Super Sonic self being pacifistic in nature.
  • Spider-Man:
    • Mr. Negative takes this to a whole new level. He was born when a synthetic drug split a man's personality in two - the pure good side became philanthropist Martin Li, while the pure evil side became Mr. Negative. Both fight with each other in an interesting way - Negative likes to corrupt all Li's good deeds, while Li helps people that suffer because of Negative.
    • Curt Connors and Lizard are often portrayed this way. However, one Retcon claims that Connors was always in control of Lizard and let him out when life was too hard for him. He just keeps telling himself it's not true.
    • Though not portrayed this way in the original comics, all subsequent portrayals of the Venom symbiote have made it out to be this, with even the comic book symbiote having been RetConned into a more malevolent entity.
  • Supergirl:
    • In the Red Daughter of Krypton story arc, Siobhan Smythe—who usually is the super-villain named Silver Banshee—let her Silver Banshee evil self out during her fight with Supergirl to try to hold her mindless friend back. Despite of her fears, she manages to keep her banshee side under control.
    • In Supergirl vol. 2 college professor Barry Metzer built a machine to kick-start his brain and body's evolution; but he developed an evil, ruthless split personality who took over.
  • The third Black Knight Dane Whitman's first squire, Sean Dolan, suffers from this. As himself, he's a normal human Plucky Boy and Boisterous Bruiser-in-training who looks up to Whitman and wants to be a good sidekick. But when he makes the mistake of drawing Whitman's cursed sword, he turns into the demonic Bloodwraith who is willing to kill good and bad alike, cruelly mocks Whitman and his friends and can (literally!) level small countries. Sean spends much of the time afterwards trying to keep his evil side and addiction to the sword's influence under control and failing miserably.
  • X-Men:
    • 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. Of course, he uses it so often without negative side effects that the whole "evil side" part is something of an Informed Flaw.
    • It's still not clear whether Dark Phoenix is Jean Grey's Super-Powered 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.) However, one thing remains the same: if you see her green costume turn red, you want to be in the next galaxy over. (That's Not Hyperbole; she's responsible for the eradication of a whole solar system.)
    • Angel has Archangel, the persona he developed after being experimented on by Apocalypse. Warren usually has wings and average healing powers. Archangel has razor sharp, retractable wings that launch out metal feathers that are dipped in his natural poison. X-Force had to call upon Archangel more than a few times, though he has since been extinguished, and Angel now possesses angelic metal wings.
    • Professor X himself is has had this happen as he tends to repress every negative thought and emotion he experiences—which on three different occasions—the lead-up to the original Phoenix story, X-Mem vs. the Micronauts, and "Onslaught"—taking lives on their own, with the evil personality being the Big Bad of the last two stories.

    Fan Works 
  • Played straight in Ah! Archfall!. Even before he had his Archs, Jago was a competent fighter but when things got rough, he could us his dark power side, known as "Papa Jupiter". At his most basic level, Jupiter can boost Jago's fighting power to the point where he can plaster ten grown men. At the full extent of his powers, he is AT LEAST as powerful as either the Almighty One or Lady Hild (possibly more so). Unfortunately at this level of power, he has no problem with killing people, even those he cares about (though he prefers enemies as they tend to fight back). As the story progresses, its revealed that Jupiter taking over is the only thing that Jago is REALLY afraid of. This is brought to a head during the Deity Games when he faces a mirror that reflects a person's worst fears as sees the result of what a fully unleashed Jupiter can do; he devastates the world, crucifies Lamb and Damascus, beats Lind to death with a rock and uses his knife to murder their infant son. The physic torment this causes is so great that it actually makes the mirror shatter.
  • Ancient Sins: After refroming, Dante's evil side is both his shadow biology and the culivation of his anger and pain, Dark Stardust.
  • In The Bridge, Monster X's Kaizer Ghidorah transformation serves as this. Monster X is a Noble Demon, while Kaizer Ghidorah is a bundle of hatred and rage. Monster X is roughly equal in strength to other kaiju like Godzilla and Gigan, while Kaizer Ghidorah can curb-stomp them.
  • In Child of the Storm, Harry has a dark side that starts appearing after chapter 50. While not strictly another personality, it's certainly another side of him. According to Carol (who's had a look inside his mind), like all the experiences that should have screwed him up have been locked away in a box in his mind, constituting his dark side. It's frighteningly cold, ruthlessly calculating, and while not explicitly more powerful, Carol describes it as The Unfettered, while others describe it as being frighteningly reminiscent of a young Magneto. In one early appearance, it resulted in Harry putting an entire HYDRA assault team at his mercy and nearly forcing a Psychic-Assisted Suicide after their leader took a child hostage, only being talked down by Jane. Then, a chapter later, it led to him telekinetically ripping Gravemoss' ribcage open and tearing his heart out (not that it had any long term effect). Unsurprisingly, Carol keeps a close watch on him, as Harry does on himself, being invariably horrified by what he's done when it sinks in.
    • Towards the end of the first book, Harry's protection is revealed as a fragment of the Phoenix Force, and the start of Ghosts of the Past shows that he can tap into it. Considering the already mentioned dark side and that the Phoenix has taken him over to protect him, appearing in the gear of the Dark Phoenix and destroying everything in its way, this is rather worrying - while the Phoenix is broadly benevolent or at least, Lily, the White Phoenix of the Crown, is, the power itself is a) morally neutral, b) incredibly volatile. As a result, Loki's fear is that that the two will combine and turn him into the Dark Phoenix. This fear turns out to be entirely justified.
    • Bucky's Winter Soldier persona functions as this. He's still got the same abilities and skills, the Soldier persona is just much more ruthless, focused, and economical.
  • In The Dark Side of the Mirror Verse, Mirror Twilight creates the same Mana Drain device as Human Twilight did, which ends up draining mana from ponies at the party she's attending, including Mirror Tirek, resulting in it overloading and exploding (as she hadn't absorbed the World Mirror's magic to prevent such a thing from happening). This, combined with her bitterness, hatred, and envy of Princess Trixie, transforms her into Nightmare Spotlight. She promptly rips Canterlot apart to create a floating stage in the sky and attempts to kill Trixie to get revenge for the wrongs she thinks Trixie has done to her, planning to move onto everypony else she feels did her wrong. All publicly before all of Equestria on a live 'show' to finally get the respect she believes she's been denied all her life.
  • Date A Re:Live: This Date A Live has both existing and new inverse forms.
  • In The Dear Sweetie Belle Continuity, Twilight's research indicates that all alicorns are vulnerable to this if they swing too far to an extreme of the ideal or magic they are meant to personify, explaining Nightmare Moon. It is also implied Celestia went through this during Luna's exile. Cadance forms one, the Crystal Empress, once she learns of Shining Armor and Luna's affair.
  • There are a couple among the children of The Emiya Clan.
    • Sakuya inherited part of the Angra Mainyu from her mother. Perhaps because of the diluted bloodline, it manifested itself as a slightly annoying second personality rather than a mad dark mode. The family calls them Yin and Yang to keep things simple. Yang is a bookish, modest, and generally reserved girl with mild Yuri Fan inclinations. Yin is an openly perverted, conniving, and slightly sadistic Yaoi Fangirl.
    • Haru, by virtue of being a vampire, has his Dead Apostle side. It's more of a berserk mode, but an alternate future version of him, DA!Haru showcases what it could have made him into if he ever let it get out of control.
    • Touma's ten years of torture and experimentation before being rescued left him with a cold blooded alter ego called, ''The Ghost''. It isn't evil, but it has no moral inhibition, wiling to do whatever it takes to protect those he cares for.
    • Mana Ryougi has her alternate male personality, MANA, as per her family trait. She hates being told what to do by anyone, including herself, so she mostly ignores him. Until she has her Despair Event Horizon.
  • Count Logan is this for Beast Boy in The End of Ends.
  • Kallen has one in the fanfic Fairy Without Wings. It's the Etherious side of her soul.
  • Taiga has a variation in Fate Game Night when she wields her shinnai, which she's stored all her negative emotions in (particularly hatred and anger), turning it into a pseudo cursed sword. Though it's main weakness is that while she does become far stronger, the shinnai contains only a finite amount of power; once her hatred runs out, she turns back.
  • Played with in Harry Potter and the Methods of Rationality. Harry has what he calls a "dark" side, which is extremely good at plotting and seeing through plots... but that's it. Harry, who is familiar with this trope, is very put out when he discovers that it's no better at magic than him, and thus considers his "dark" side to be defective.
  • In Heir by Na'hiel "Tom" the horcrux Voldemort accidentally made that resides in Harry's scar which has became sentient and very protective of his host is this for Harry.
  • In the Jackie Chan Adventures fic Queen of All Oni, the re-emergence of Jade's Queen of the Shadowkhan persona and her Start of Darkness that occurs because of it is what kicks off the entire plot.
  • Leviathan (My Hero Academia): Izuku Midoriya's quirk is the ability to transform into a titanic monster dubbed "The Leviathan" should he ever lose control of his emotions. The Leviathan is extremely powerful, flattening buildings with ease, but is completely and utterly uncontrollable. Izuku can give himself specific traits of the beast by moderating his emotions, but he's nowhere near as powerful as what a full transformation can do.
  • The MLP Loops: Played for Laughs. In canon, Luna went Drunk on the Dark Side, rebelled against her sister Celestia, and was banished to the moon for a thousand years. Whenever a Looper ascends to alicorn for the first time, soon after there will be a "sisters loop" where the new alicorn takes the place of Luna, with Twilight taking the place of Celestia. No matter how hard they try, the first time they experience such a loop the new alicorn will go Drunk with Power and have to be banished to the moon. Of course, this being Equestria, a lot of these dark sides are more than a little silly. Examples include "Hard Truth" (Applejack becomes obsessed with the entire country growing apples), "Danger Dash" (Rainbow Dash performs more and more pranks), "Party Pink" (Pinkie Pie won't stop throwing parties), "Flying Hatred" (Fluttershy suffers dangerous mood swings due to a curse), and "The Fashionista" (Rarity invades griffin lands in an attempt to open up more markets for her dresses). Big Mac is the only known alicorn who managed to avoid this fate on his first run, but then he hadn't actually ascended.
    Twilight: Congratulations on joining the alicorn club, it helps if you've thought of your evil self beforehand.
  • In Mirrored while stuck in Voldemort's form Harry draws on the power of the horcrux. Subverted because while the horcrux gives him a significant boost it is acting in complete accordance with Harry's desires even the desire for Voldemort's death.
  • In the Pony POV Series, Princess Luna nearly reverts back into her Nightmare Moon form as a last ditch attempt to stop Discord, but manages to snap out of it. It's later revealed that at least some ponies have a similar Super-Powered Evil Side; Rainbow Dash nearly transforms before being calmed down at one point. Unfortunately, nopony is around to calm Fluttershy down when she snaps and she transforms into the Reality Warping Mad Goddess named Princess Gaia, a Well-Intentioned Extremist who seeks to turn the world into a utopia by brainwashing everyone into being happy and turning them into foals because she perceives them as being happier at that age.
    • It's revealed in "Playtime" that Princess Gaia was simply an illusion hiding her real Super-Powered Evil Side, the monstrous Nightmare Whisper.
    • Luna explains the Super-Powered Evil Side thing a bit in "AJ's Dream": it's what happens when a single aspect of an alicorn (or being with a similar power, like a wielder of an Element of Harmony) consumes them and becomes the only part of them. Nightmare Moon was when Luna's night became the only thing that mattered to her and Nightmare Whisper was when Fluttershy was consumed by her kindness. We're also shown possible Super-Powered Evil Side forms for Applejack (Nightmare Mirror), Rainbow Dash (Nightmare Manacle), and Pinkie Pie (Nightmare Granfalloon), though all of which are Alternate Universe versions of the mane cast.
    • The final stretch of the Dark World arc introduces Nightmare Eclipse, an alternate-timeline Twilight Sparkle gone Nightmare after being consumed by the desire to make Discord suffer for what he's done, and thus created a "Groundhog Day" Loop to trap him in, deleting each world and rewinding time each time Discord is defeated so he can suffer some more... and not caring that she's casually deleting/killing millions of innocent ponies each & every time she resets the loop.
    • In addition, the end of the Mind Games arc sees Diamond Tiara transform into a Nightmare, but as a result of Discord's psychological manipulation and breaking of her spirit rather than a facet of herself consuming her. Her theme is Discord's brand of chaos, and she earns a certain eight-pointed star symbol as her new Cutie Mark.
  • The plot of The Power of the Equinox begins when Twilight Sparkle, trapped in the crystal caves beneath Canterlot, accidentally releases from a black crystal the Entity. After it takes root in her body, she transforms into a darker and carnivorous mare who has new powers, like a powerful healing factor and phasing abilities, and she can create appendages and weapons from the black substance that's attached to her. Making a point of no longer being Twilight Sparkle, she renames herself as Dimmed Star. However, while more aggressive and aloof than before, she still cares about her loved ones to varying extend, and the worst things she does are done when the Entity takes control over her mind. Rainbow Dash lampshades this trope to Spike by saying that Twilight has "pulled a Nightmare Moon".
  • Shadows Awakening: Jade gains a Shadowkhan form that she can switch in and out of, which gives her an edge in battle. But the more she uses it, the more The Queen's attempted corruption of her body and mind accelerates, being kept in check by only the Tiger Talisman.
  • In The Shadow Wars universe, a Nightmare can happen naturally or with the assistance of the Night Shadows, horrible parasitic possessors from a dying alternate universe.
  • Dark Cupid gets more than he bargained for in Spellbound when he hits Chat Noir with one of his Mind Control arrows. Since Adrien is half-fae, and his fae side is resistant to magic, the arrow merely suppresses his human side - the side that has recognisable morality and compassion and other such niceties like restraint. He proceeds to enjoy beating Dark Cupid to a pulp, and would have outright killed him if Ladybug hadn't intervened.
    Faedrien: Yoſhouldn’t havdonthis.
  • In the Tamers Forever Series, Chaos is Takato's Super-Powered Evil Side, and the reason why pushing Takato's Berserk Button is a very bad idea.
  • In the Star Trek Into Darkness fic That Was A Good Fight this happens to Kirk as a side-effect of Khan's blood.
  • In the Death Note fanfic Zenith, Darkness, Reverie, this is Kira's purpose. Although the "superpower" in question is Kira's utter lack of morality and the willingness to wield the Death Note. Kali is arguably the more intelligent/strategically capable personality.
  • Zero 2: A Revision has the Digimon emperor being presented as Ken's dark side whenever he shows up as a result of Demon's Dark Spores. Later, in an attempt to stall the prevent the Digidestined from entering the real world and destroy his entire army and to keep the Digidestined from evolving their Digimons so that he will remain at full power to combat Demon, Umbradevimon decides to corrupt Davis, using his own jealousy and hatred for TK against him with the help of the Touch of Evil as well as 15 black gears to create Darkheart, Davis's own evil self. Darkheart at first starts out as an obedient automaton whose only purpose is to keep the Digidestined on their toes under Umbradevimon's instructions. Unfortunately just as the Digidestined decides to enter the real world and leave some behind to stall him, Demon inserts a Dark Spore to him which gives him a free will and becomes a sadistic psychopath hellbent on absorbing the Digidestined just because he can do it and to become the greatest villain of all time. Umbradevimon's plan unintentionally works a bit too well as Darkheart single-handedly managed to create the Darkest Hour for the entire Digidestined a long time (13 chapters to be exact) before he finally gets taken down.

    Films — Animation 
  • 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.
  • In The Iron Giant the giant is pretty powerful on his own, but friendly. You do NOT want to push his Berserk Button however.
  • Uni-Kitty from The LEGO Movie is normally a Genki Girl Cloud Cuckoolander. However, it's shown she has some pretty bad anger issues, and when sufficiently pushed she transforms into a demonic, red-furred version of herself that can fly and bite Micromanagers in half.
  • My Little Pony: Equestria Girls:
    • Sunset Shimmer in the first film is a nasty person, but she still has limits; she doesn't kill Twilight and she lets Spike go rather than trade him for the Element of Magic, when she has her chance. When she corrupts herself (with the Element of Magic) into a demon form, she has no such limitations and tries to fry Twilight and her friends without a second thought. She's immediately remorseful for what she's done after being turned back, and in later movies is able to harness the power of the Elements without becoming corrupted thanks to The Power of Friendship.
    • At the climax of My Little Pony: Equestria Girls – Friendship Games, Twilight Sparkle's human counterpart transforms into Midnight Sparkle after being pressured into unleashing the magic inside her magic-absorbing amulet. With this power, she blasts open portals to Equestria all over the place, with little regard for the stability of the non-magical human world. She snaps out of it thanks to Sunset Shimmer.
  • The anime movie Tekkonkinkreet has the main character Black get saved from space aliens by his own Super-Powered Evil Side known as "The Minotaur" which then tries to completely overtake him and show him the true power "The Minotaur" can unleash.

    Films — Live-Action 
  • In Forbidden Planet, the ancient alien civilization made a giant machine which is capable of turning thoughts into reality. It turns out that the machine works even better with subconscious thoughts.
  • Donning The Mask unleashes a person's Super-Powered Chaotic Side. However, when it is wielded by the villain, he becomes even more of a monster. In the comics, however, it unleashes a more "evil" side to a person, as the eponymous mask takes the driver's seat of their mind.
  • 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.
  • The version of Venom in Spider-Man 3 is Peter's Super-Powered 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. Now for Brock, who's already portrayed as an asshole from the beginning, it's a different story. It should be noted Evil Pete isn't that nice. He makes a reasonable effort to kill Sandman and is at least indifferent to whether Harry survives a pumpkin bomb to the face.
  • The premise of the movie Split is a man with 23 personalities kidnaps three women to sacrifice them to a Super Powered new personality called The Beast when it emerges. Most of his personalities are decent people, and he is horrified by what he has done when his original personality briefly gets control again. The explanation given for how The Beast has super powers is the idea that a person with Dissociative Identity Disorder can change their bodies based on their beliefs although the Twist Ending of the movie reveals that it takes place in the same universe as Unbreakable where super heroes and villains do exist.
  • In the Star Wars franchise, it's possible for a Jedi to temporarily become stronger by tapping into The Dark Side, but with the consequence that it can become permanent. It's also not guaranteed to work, since it can backfire and lead to their making stupid mistakes due to being Drunk on the Dark Side.
    • For example, this is how Luke Skywalker defeats Darth Vader in Return of the Jedi after being provoked into an Unstoppable Rage by Vader's use of the Relative Button. Palpatine even says it: "Your hate has made you powerful." Luke refuses to kill Vader after defeating him, though he comes very close, and if he had that would have led to becoming the new Vader.
    • Per Word of God, this is also how his father Anakin defeats Master Swordsman Count Dooku in Revenge of the Sith ... but it has the cost of causing him to edge closer to The Dark Side. Unlike his son, he gives into his anger and kills Dooku, leading to his fall to the Dark Side later on. And despite believing himself to be more powerful because of this, it leads to him trying a reckless maneuver during his fight with Obi-Wan Kenobi that results in some horrific injuries (which are the reason he needs to wear the black suit in the original trilogy).
  • Various film adaptations of The Strange Case of Dr. Jekyll and Mr. Hyde, though this is not present in the original book:
  • In Suicide Squad (2016), archaeologist June Moone inherits the powerful and evil spirit of The Enchantress, and can tap into The Enchantress's evil powers by speaking her name. Amanda Waller attempts to make The Enchantress a member of the Suicide Squad, however The Enchantress gets permanent control of June Moone early on and becomes the main villain instead.
  • Upgrade: STEM has far less qualms about killing people than Grey does, and it certainly can move Grey's body in ways that Grey, or most humans even with extensive training, can. It also turns out being an Enemy Within.

  • Beranabus, in Darren Shan's demonata series. As a result of being half demon, he was able to turn into one. He does this only once, because he's afraid that this ability is one of these, in order to fight Death. He succeeds in his goal of sending it back into the demonata's universe, but dies in the process..
  • Rachel from Animorphs has two examples: in The Separation a freak accident with a starfish morph splits her into two Rachels, a 'Nice Rachel' that's timid, ditzy and strategic, and 'Mean Rachel' who gets all of Rachel's Blood Knight instincts but none of her restraint. Later in The Return Crayak tempts Rachel with godlike power, transforming her into a steel-clawed, indestructible killing machine dubbed 'Super Rachel'.
  • In Count to the Eschaton, hero Menelaus also has houses the super-powered and amoral Iron Menelaus. Likewise with Del Azarchel/Iron Del Azarchel.
  • Myrren Kahliana in Dark Heart discovers she has one as she learns to use her magical powers. It saves her life more than once, but when it comes out, it doesn't want to go back in.
  • Date A Live has Inverse Form, a state which Spirits enter if they pass the Despair Event Horizon. In Inverse Form, a Spirit is far more powerful and also lacks any sense of restraint. Their weapon, previously referred to as an "Angel", is replaced by a darker counterpart called a "Demon King". Interestingly, it's later revealed that this is the true personality of Spirits.
  • In Deltora Quest, when Steven is in danger, he transforms into/releases Nevets, who usually rips apart nearby enemies, along with everyone else stupid enough to get near him.
  • Literature/Discworld: Sam Vimes has one that he calls the Beast, which starts off as a natural part of Vimes' mind, but gains a boost in power when he's infected by the Summoning Dark, an ancient dark force of vengeance. He also has a Superpowered Good Side, his "inner watchman", that calls itself the Guarding Dark and is not only capable of keeping Vimes' own internal darkness (the aforementioned Beast) in check, but also repels the Summoning Dark when it tries to take over Vimes.
  • In the Dreamblood Duology, Gatherers are well trained and educated priest capable of killing people in their dreams and making them enjoy it. Reapers are Gatherers who have lost control and become addicted to the dreamblood they collect as their job. Those are capable of killing hundreds or thousands of people at the same time just to get their desired dreamblood.
  • The Dresden Files have the Denarians, fallen angels sealed in silver coins. So much as touch the coin, and they get a free pass to the back of your mind, to convince you in any way they can to accept their power. Once you do, they go from backseat driver to Super-Powered Evil Side and grant you extreme power, at the low, low cost of your immortal soul. Over time, the human host starts to become as evil as the Denarian (if they weren't already).
  • Egil's Saga: When Egil's father Skallagrim is in a fit of 'shape-strength', he is even stronger than usual but also an incontrollable madman who kills indiscriminately. When Egil is twelve and playing at a ball-game against his father and it looks like Skallagrim is going to lose, he suddenly becomes 'shape-strong' and kills Egil's best friend Thord, his nanny Thorgerd, and very nearly Egil himself.
  • In The First Law series, Logen Ninefingers is known as a vicious and bloodthirsty berserker called the Bloody-Nine. However, Logen is actually a pretty nice guy who really doesn't like fighting very much. His Bloody-Nine persona is an alternate personality of unstoppable bloodlust. When the Bloody-Nine takes over, Logen becomes superhumanly fast and strong as well as nigh-invulnerable. Logen hates his Bloody-Nine side, however, because he kills everything in sight, friend and foe alike.
  • In House of Leaves, Johnny Truant channels his Super-Powered Evil Side against Gdansk Man. 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.
  • In The Lord of the Rings, the bearers of the Elven Rings are terrified of acquiring a Super-Powered Evil Side should they ever come into possession of the One Ring. The One Ring would give them far greater powers than the ones they already have, but would simultaneously also corrupt any achievements that the Ring had made possible, no matter how benign their original intentions were.
  • In the Malus Darkblade series, the title character can use T'zarkan, the daemon possessing him as this, but with a twist: each time it happens, T'zarkan gains a little more control over him.
  • In The Other Kind Of Roommate, Xander is very rightly this to Alex. On top of being ten times more of an aggressive and amoral personality, complete with every profanity known to man, plus a few he strings together, he's the half with chock full of the enthusiasm needed to use their powers' final setting.
  • In the Paradox Trilogy, this afflicts symbionts. The alien implant which grants a symbiont its powers can take control of the host's body in his sleep; while it isn't exactly sentient, it is full of bloodlust and hatred and will hurt anyone the host cares about if it can.
  • Subverted in Ravelling Wrath. The setup of the story is that the Blood God will enter Rinn's mind, giving her magic powers and making her want to kill Yali. Which does happen... but when Rinn finally lets the Blood God fully take over near the end of the story, there's no fight. Instead, it leads to valuable communication that helps the heroes learn the true cause of the conflict.
  • In Redwall, some animals (usually badgers) can go into a berserker rage called the "Bloodwrath" which makes them extremely powerful, and able to totally ignore 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.
  • Multiple examples in the Skulduggery Pleasant books. Darquesse, Lord Vile and Shudder's gist come to mind.
  • Star Wars: Exar Kun, Darth Vader, Ulic Qel-Droma, Darth Malak... when a Jedi falls to the Dark Side, it's time to get out of Dodge.
  • Trapped on Draconica: Halfway transforming into Mordak makes Kalak far more powerful but it also makes him a mindless killing machine.
  • Philuffy in Undefeated Bahamut Chronicle has her Abyss state, which greatly increases her strength, regeneration and even mental capabilities. This is due to being implanted with tissue from the Puppeteer Parasite Yggdrasil, so when she first used this power it rendered her susceptible to its control. After Yggdrasil's death, this is no longer a risk. The state isn't inherently evil, but it does make her susceptible to control by horn flutes (a type of artifact that can control Abyss).
  • Villains by Necessity: Sam, courtesy of Valeriana's medallion.
  • Wild Cards:
    • The Radical has the combined powers of all other alter-egos of Captain' Trips, thus making one of the most powerful aces. He's also, depending on where you stand, a Well-Intentioned Extremist or a full-blown villain. Obviously he won't let Trips take back the control of his body.
    • Greg Hartmann is an amoral, egoistic and hypocritical politician who doesn't care about whom he uses, kills, maims, or hurts in his hunt for power. He is clearly an evil character, but he is absolutely lovely compared to his alter ego Puppetman, a complete sadist and sociopath who uses his potent emotion manipulation power to bring out the worst in everyone and only lives to revel in the violence and horror he creates.
  • In Wings of Fire, Clay thinks he has a suppressed bloodlust in him due to having attacked the other dragonets at their hatching, causing the dragons raising them to think he's a monster. It turns out to be subverted, when it's revealed that Clay's "attack" was Big Brother Instinct, helping the others hatch.
  • Stormform in Words of Radiance grants the Parshendi the power to call lightning and invoke an Everstorm, but in order to enter it you have to bond with a spirit of pure hatred.
  • In The Zombie Knight, hyper states count as this when the reaper-servant pair isn't old enough and well enough synchronized to control them. For years after they first unlock the state, using it puts them in a state of self-hypnosis where they're driven solely by the desire to attack. When Harper and Darsihm (bonded for ~30 years) use pan-rozum, the fact that they were able to maintain a small "whitelist" of souls they shouldn't target was an amazing feat of control, and even that was nearly a disaster since there were hostages around whose souls they hadn't memorized.

    Live-Action TV 
  • Arrowverse:
    • The Flash (2014): In the third season, Caitlin starts manifesting her Earth-2 counterpart's superpowers. Eventually, this starts to result in the Killer Frost persona taking over, complete with white hair, icy blue eyes, and a reverbing voice, not to mention the cold powers. It's made clear that Caitlin and Frost are constantly struggling for control. This is foreshadowed by Frankie Kane, whose body is occasionally taken over by her Flashpoint counterpart Magenta, with glowing magenta eyes, an evil smile, and metal control powers. Barry is able to talk Frankie into reining Magenta in, though. (As for Caitlin, after a several-episode run in full Killer Frost mode, when Savitar is on the verge of finishing Cisco off, she finds she can't bring herself to allow it, and returns to Team Flash for the final battle - but not to her original pre-powers personality. Even she isn't sure who she is anymore, and pulls a 10-Minute Retirement while she rediscovers herself between seasons.) Frost eventually develops into more of a Jerk with a Heart of Gold, acting as a Superpowered Alter Ego to Caitlin.
    • Supergirl (2015):
      • Samantha Arias is an average single mother who eventually discovers she has Kryptonian powers, but can't activate them at will, only during stressful situations. Her cold and ruthless "Reign, the Worldkiller" persona has full control over her powers, and is even more powerful than Supergirl. In their first fight, she beats up Supergirl so badly she is broken and bleeding and needs to be hospitalized, while Reign doesn't have a scratch on her despite taking several hits. Eventually, Samantha manages to destroy her Reign personality, but this causes her to lose her powers, basically leaving her an ordinary human.
      • Brainiac-5, or "Brainy," is the White Sheep of the extended Brainiac clan. It turns out he is only able to maintain his emotions and more heroic outlook by boxing up his Genetic Memory. When tortured, his cybernetic brain glitches, all the boxes open, he slaughters his captors, and then casually sacrifices his own allies for the sake of the mission.
  • 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.
  • Buffy the Vampire Slayer has two 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?" More emphasis on the evil, though.
    • Played with for a bit in his own series where he becomes a SED Knight Templar version of himself: as Angelus he'll gloat and joke and dream up sadism. As a frightening mix of the two Angel is basically the most vicious vampire in history, on our side.
    Let them fight the good fight. Someone has to fight the war.
    • When Willow is pushed to the snapping point, she unleashes a Super-Powered Evil Side in a ''bad'' way, replete with utterly delightful badass one-liners. I. OWE. YOU. PAIN.
    • The depth of this is such that Willow, the cutest, sweetest, and most innocent of the Scoobies at series start, becomes the only non-Giles member of the Scoobies to have directly murdered an innocent person. (Glory wasn't innocent, but the human Ben was)
    • The emphasis here is on the superpowered - Dark Willow is arguably the most powerful known being in the Buffyverse.
    • As time goes on, Willow seems to have her Super-Powered Evil Side under control. It's more that she turns evil when she uses powerful magic, but then she turns back good when she stops. A scene in Season Seven demonstrates this effectively: while using a powerful barrier spell to protect an innocent girl from a spider demon, Willow gets the black eyes and black hair, and also calls the girl a bitch. After the demon leaves, she goes back to normal, and apologizes to the girl.
  • The Crow: Stairway to Heaven: In lieu of 22 non-stop episodes of a demented supernatural killer running about creating mayhem, the TV series of the film of the comic book created a personality split for Eric, where the Crow persona takes over when he becomes enraged or is under particular stress, or someone uses magic to make it happen.
  • The Doctor from Doctor Who is seen as this by John Smith, his temporary human self in "Human Nature/The Family of Blood".
    • The Time Lord Victorious and the Valeyard both qualify as this to the Doctor.
  • 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...
  • Every heroic vampire protagonist or Supporting Character: see Forever Knight, Angel, and Moonlight.
  • 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 some people suffer a dissociative break to cope with the new 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.
  • The Incredible Hulk (1977):
    • In "Dark Side", David suppresses one side of his brain and succeeds only in letting his, well, dark side take over. He still doesn't kill anyone, but the usual halfway-point-Hulk-out-that-doesn't-affect-the-plot is much more interesting than usual.
    • This was played with in another episode, wherein David discovered that a small-town scientist had succeeded in creating a hulk-like creature decades ago. Reading through the scientists' notes in hope of getting insight into a cure for his own condition (while being assisted by the now-elderly lab assistant who had originally transformed many years ago), David reads a observation by the scientist that the creature is murderous and cruel, and notes that he believes it is due to the inherent personality of the human subject. Cue an Oh, Crap! by David as he realizes there's a secret reason why the lab assistant is being so helpful in trying to recreate the process that made him into a Hulk. The early Hulk wasn't an evil side, it was just the already evil personality of the lab assistant with the strength to do as it pleased.
  • A really beautiful Deconstruction is the British TV series Jekyll.

  • Kamen Rider:
    • In Kamen Rider Kuuga, Kuga's Ultimate Form could possibly make its user become the ultimate evil and destroy the world and has a kick capable of doing said act.
      • The Kamen Rider Decade version of Kuuga also possesses this form but unlike the original, he remains the evil 'Black Eyed' version his entire run in this form. Taken further when he gains Rising Ultimate form which first used as a mindcontrolled Dragon by the Big Bad.
      • Decade gains an evil alternate form in his Violent Emotion form, which turns him into a destroyer of realities.
    • Kamen Rider Blade: The Joker Undead is a feral Wild Card that can only fight and destroy. Thanks to the Mantis and Human Undead, it had developed an identity as Hajime Aikawa, who supressed any notion of his true nature out of fear.
    • Kamen Rider Kabuto's Tsurugi Kamishiro is actually the Scorpioworm, who manages to overpower both Cassisworm Clipeuses when he was unable to defeat even one as Kamen Rider Sasword.
    • Kamen Rider OOO: PuToTyra combo can easily deal even with complete Greeed and also is the only combo capable of destroying the regular medals. Unfortunately, the forbidden medals can move on their own and take control of Eiji, turning him into snarling, animalistic berserk.
    • One of the means of making war hell in Kamen Rider Build. The Hazard forms are capable of steamrolling anything bellow Evol Driver and are a solid competition even to it. They are not a triumph card, but a Godzilla Threshold as the raw power unleashed overloads the user's brain and shuts down their conscious mind, all in matter of minutes. What's left is no more than an silent, precise Attack Animal destroying everything in sight. The first time Sento used it traumatized everyone there to see it and shattered his already fragile mental state.

  • In Lost Girl, Bo has a major Super-Powered Evil Side, draining a whole room of people of their life force when someone is about to kill her lover.
  • In Power Rangers in Space this was one of the biggest parts of the entire plot. Astronema was actually the Super-Powered Evil Side of Karone, who was Andros' sister, kidnapped and brainwashed as a child. When she found out she made an honest attempt at a Heel–Face Turn, but the Dark Specter had other ideas, and she was brainwashed into being even worse than before. Eventually, her evil side was banished forever by Zordon's Heroic Sacrifice, and she became a hero in her own right in the following season.
  • In the live-action Pretty Guardian Sailor Moon, Sailor Moon's alternate persona Princess Serenity is a Super-Powered Love Makes You Evil Side. The second half of the series is spent just trying to contain her, and upon the realization she can't be contained, at least minimize the damage she causes.
  • Smallville:
  • Star Trek: Deep Space Nine: In "The Alternate" episode, Odo temporarily gets a Super-Powered Evil Side after being exposed to a psychotropic gas on L-S VI. Its effects cause him to involuntarily transform into a monstrous form, driven by rage and self-preservation.
  • Sam Winchester, Supernatural. When he taps into the demonic "special child" aspect, he is extremely powerful (telekinesis, exorcism, torturing/killing of demons, immunity to attacks by demons) but loses all his humanity and morality and becomes arrogant, violent and cold. His eyes turn yellow or black on a couple of occasions.
    • And Dean Winchester, in a way. In season 10, The Mark Of Cain turns its bearer into a heartless evil murderer who loves brutally killing everyone, and has the potential to turn them into a demon, and demons tend to have super-strength. In the past, Dean would punch an angel and doing it is like punching an iron wall; Painful. In Season 10, the Mark turned Dean into a demon, he was cured and turned back into his human-self, but the Mark still affected him and slowly turned him into this cold-blooded killer. It also enhanced his raw physical strength because he managed to beat the crap out Castiel; an angel he already punched before, but it didn't even left a mark and he nearly broke his hand hitting him. Yet Dean was able to beat the same angel into a bloody mess and leave him laying on the floor with probably a broken nose. Now, granted Castiel wasn't at full strength at the time, but Dean also punched Cupid once and almost broke his fist, and surely Castiel would still remain stronger than a low-ranking Cupid, even when he's half-de-powered... right?
  • Tokumei Sentai Go Busters and Power Rangers: Beast Morphers have the Blue Ranger Ryuji/Ravi. He has Super Strength, but the longer he uses it the more he risks becoming a violent berserker, attacking even his teammates. However, at least once, he pushes himself into that state on purpose to overcome one of the Co-Dragons.
  • The 'good' vampires on The Vampire Diaries are this when their humanity is turned off:
    • Subverted. Stefan Salvatore is a great example of this when he becomes the Jekyll&Hyde Ripper.
    • Elena Gilbert's non-humanity side is also subverted. Not necessarily different in physical strength, but also much more cold, arrogant, ruthless, and even calculating that the Salvatore brothers have to keep a sharp eye one her. They did their best trying to bring her back to her old self again. She also happens to be extremely fearless when she's in this phase.
    • Even Caroline Forbes's is a pretty straight example. She was even more capable of putting her brute strength and compelling abilities in use without hesitation, especially when she forced Stefan to turn his humanity off to save his niece.


    Myths & Religion 
  • Egyptian Mythology: In the Book of the Heavenly Cow, Ra sent Hathor - the matriachal bovine goddess - to punish a group of mortals who had conspired against him. Hathor transformed into the leonine war-goddess Sekhmet and decided to just kill everything instead, and was only stopped and turned back into Hathor when Ra tricked her into getting drunk on beer dyed to look like blood.
  • Kali is this to Durga/Parvati in Hindu Mythology.
  • Older Than Print: Cuchulainn in Irish Mythology has a prime example of this kind of Unstoppable Rage. 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 Sláine from 2000 AD to see just how mutilated he looks.) In some stories, Cuchulainn must wear a special girdle or harness to keep his body from tearing itself apart when the warp spasm takes him.

    Pro Wrestling 
  • Delirious will swap out his green attire for red attire when one of his enemies has made the mistake of making him really angry, using more heelish tactics and weaponry, and even spitting poison mist in people's faces.
  • There are hints that this is what is happening when Finn Bálor puts on the Demon war paint for big matches.
  • This was Mick Foley's schtick for a while in the WWE: when he needed a "boost" for a match, he'd come out as either his Mankind or Cactus Jack persona.
  • This trope is a tradition in Japanese pro wrestling, where many wrestlers unveil an evil persona to face a special threat or to play mindgames with a rival, and sometimes get in storyline overcome by these personas and turn fully heel, because Evil Is Not a Toy. Among them there are Keiji Muto's "Great Muta" and his many emulators, The Great Sasuke's "SASUKE", Hard Gay's "Super HG", BxB Hulk's "Killer Hulk", Gamma's "Gamma Daio", Kikutaro's red mask, and many others.
    • In 1996, Japanese wrestler Jushin Thunder Liger, who traditionally played the role of a face, unveiled his "Kishin Liger" heel persona, when he wrestled heel wrestler the Great Muta, who mid-match ripped Liger's mask off, revealing his "oni face". Liger's wrestling style would become notably more aggressive and heel-like in this persona.

    Puppet Shows 
  • An episode of Mr. Meaty had Parker (who is normally calm under pressure because 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.

  • 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.
  • Simon from Dawn of a New Age: Oldport Blues has an evil split personality known as the Dark Dragon. While both of them are capable of manipulating plasma, Dark Dragon is capable of doing so to a much stronger degree than Simon, and also lacks the inhibitions that make Simon hesitant to use his power.
  • In the fandom role-play Infamous: After the Blast and all of its subsequent storylines, the (debatably) main protagonist, Felix Shane, is revealed to have this. Originally thought to be a form of Dissociative Identity Disorder or something similar, it's later revealed that Felix Shane does not, in fact, have any alternate personalities. Instead, he actually WANTS to murder all the time, but holds that side of him back whenever possible. However, when he does let it out, he becomes significantly more powerful, as he's no longer holding himself back. This side of him is his Psych/3rd "personality." Contrast with his Shadow/2nd personality, who has the same effect but is released through his indomitable rage.

    Tabletop Games 
  • In Dungeons & 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, they pass a will save, or there's nobody nearby.
  • Exalted has a couple instances where the characters go temporarily insane on some level:
    • 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 Ghost-Blooded (in the 1st 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.
  • The Chronicles of Darkness keeps much of this:
    • In Vampire: The Requiem, vampires have the Beast within, which compels them to feed.
    • In Werewolf: The Forsaken, werewolves have two degrees of rage: one where they have to kill something, and another where they have to kill everything.
  • This crops up in the various Old 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. However, while in the thrall of such a state, vampires can ignore wound penalties, which is a significant combat asset.
    • Werewolf: The Apocalypse: 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, rabid dismemberment, or... erm... defilement).
    • In Changeling: The Dreaming, 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.
    • Wraith: The Oblivion: Wraiths have got their Shadow, a second personality usually existing within the wraith trying to make them them give up their struggles and descend into nonexistence or permanently hand over control of their body. Depending on the Shadow, this might take many forms, some direct and some seemingly helping the wraith. The latter type often has ways to enhance the wraith's body when temporarily in control - better attributes, more magic powers or even items appearing only during the Shadow's catharsis. Such wraiths then always have the ability to let their Shadows handle combats too tough for them, but are generally loathe to do so because there's no telling what else the Shadow might do while in control.
    • Kindred of the East: Being a kind of vampire, Kuei-jin must keep their amoral lower soul (P'o) under control, lest it takes over them in a frenzy of carnage. It's not an easy thing to do since each Kuei-jin's P'o is out of balance, compared to the living. Some Kuei-jin Dharma try to make good use of this evil side, though.
  • And to round out White Wolf's systems: In Scion, the Scion Companion supplement adds the Tuatha Dé Danann to the playable pantheons. One of their pantheon specific abilities? The "Rí­astrad" mentioned in the above mythology entry.
  • Highly common in Warhammer 40,000, 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 Supersoldier 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". And then there's the Possessed Marines, who have a Super-Powered Super Evil side.

  • Takanuva gets one of these in BIONICLE, after having some of his Light drained by a Shadow Leech.

    Video Games 
  • In Puyo Puyo Fever, Klug has one in Strange Klug and Sig might have one in Black Sig. But we do mean "Super-Powered" for Strange Klug; he's not only a final boss, but some kind of demon king from long ago. He appears often due to, surprise, Klug's Aesop Amnesia of carrying a possessed book after it already possessed him.
  • 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.
  • To an extent Berserker Asura in Asura's Wrath is this, and is also a One-Winged Angel transformation: It's something of a Shout-Out to the Naruto example above, as well as the .hack//G.U. movie's B-ST form. It helps that the guys that made Asura's Wrath make .hack and the Naruto Ultimate Ninja games.
  • In Avengers Academy, Superior Iron Man is interpreted as this for Tony. He goes mad with power after one of Loki's spells goes awry.
  • BlazBlue: Mu-12, the Sword of the Godslayer Kusanagi, is this for Noel Vermillion. In a twist of the usual formula, Mu is her original form, created to destroy Master Unit Amaterasu, the equivalent of God in this setting. A botching of her "smelting" process (as in the entire building and city she was in exploded) resulted in her being incomplete and developing her own personality. Terumi invokes her transformation and completes the process, but she's saved by Ragna and later turns to tap into that power as a regular Super Mode.
  • The Slayer from Baldur's Gate II, a ten-foot tall spiky mass of pure murder that the protagonist can use and results from channeling the power of Bhaal, the murder god who fathered the PC. An interesting example in that the Slayer seems to have been part of the PC all along, and only surfaces when the PC loses their soul. 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.
  • In The Elder Scrolls spin-off Dungeon Crawler game Battlespire, this is a trait of the Dark Seducers. Also known as Mazken, Dark Seducers are an intelligent race of lesser Daedra typically found in service to the Daedric Prince Sheogorath. They are more humble and sympathetic toward mortals, having less of a Puny Earthlings attitude toward them than most lesser Daedra. However, they are also known to Fight For The Strongest Side, quickly switching allegiances if it becomes beneficial to them. The group of Dark Seducers fought in Battlespire betrayed their former master (a lieutenant of Nocturnal) to side with Big Bad Mehrunes Dagon when he promised them greater power. They were rewarded by being remade in the image of Dagon's own greed and treachery - becoming not only physically stronger, but also gifted with powerful bat-winged forms. In later appearances, they lack this form, but are still powerful and intelligent lesser Daedra akin to Dremora and Golden Saints.
  • 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. In the third game, the transformation is changed to a "Trance" attack, where he becomes much more powerful, however the transformation only lasts a limited time, or until you leave the room.
  • In BoxxyQuest: The Gathering Storm, Anonymous learns a skill called “Hidden Depths” that lets him deal massive damage to an enemy, but then leaves him in a state of uncontrollable rage for the rest of the fight. This seems pretty incongruous with the rest of Anon’s skillset, until Chapter 7 when you learn that he’s actually an amnesiac fragment of Legion, a shattered chaos god and the Greater-Scope Villain, and that using Hidden Depths means letting Legion’s will take over.
  • Ryu from Breath of Fire 3 can transform into the ultimate dragon, Kaiser. Its normal form (the Infinity gene alone) is uncontrollable and Ryu will attack randomly (including his allies). Two other gene fusions allow it to be controlled, with one (Infinity + Failure) significantly weaker than the "true" form (Infinity + Trance + Radiance).
    • Rei can transform into a weretiger after some story progression; like Kaiser, Rei's attack power is vastly increased but he attacks random targets. He can be directed to the target of the Influence skill (learned from Boss Goblins).
    • Any character who uses the Berserk skill gains a similar effect as the weretiger transformation, but the downside is that it kills you in three turns unless you have equipment that averts death.
  • Soma Cruz in Castlevania: Chronicles of Sorrow is the reincarnation of Dracula, while Alucard is Dracula's son. The emergence of their Super-Powered Evil Sides are Alucard's greatest fear and Soma's bad ending. (Although they both are pretty damn powerful as-is.)
  • The Abomination in Darkest Dungeon is a werewolf that has mutated even his human form into a Humanoid Abomination, but the character in question is afraid that "it" does things behind his back such as eating children or causing mayhem and lives in constant paranoia as a result.
  • 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-badass 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.
  • Death end re;Quest has Glitch Mode. Even when used as a standard Super Mode, it changes the user's personality in a specific way that differs depending on the user, and usually for the worse. The reason is eventually revealed to be that the buggies (the miniature Entoma that enable Glitch Mode in the first place) actually feed off of a specific emotion, preventing the user from feeling it. Typical access to Glitch Mode makes said emotion flow back into the user to an extent, which causes the personality shift (Lily's emotion is anger, Al's is sadness, Lucil's is joy, Celica's is despair, and Clea's is courage). However, if their particular emotion overloads, they glitch out unwillingly and potentially permanently, lashing out at everyone around them with even greater levels of power. The only exceptions are Clea (who willingly overloaded her courage in order to stand a chance against a glitched Celica) and Shina (who doesn't overload at all). And ironically enough, Shina's is probably the scariest, turning her into an Ax-Crazy paradoxical sadist that both asks if an attack hurt (which it probably did) and goes into Why Won't You Die? fits. Thankfully for the cast, the "evil" part seems to have disappeared in Death end re;Quest 2.
  • Rozalin from Disgaea 2: Cursed Memories manifests a Super-Powered 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: Absence of Justice has a similar Super-Powered Evil Side that can go on a complete rampage in one of the endings.
    • While not "evil" so much as mindless, Usalia from Disgaea 5 transforms into a berserk beast when she goes without curry for too long, as a result of Majorita's curse. The love of her parents plus the release of her own mental and emotional burdens causes the curse to devolve into her Super Mode when they take an attack from Majorita meant to kill her.
    • Also from Disgaea 5, Killia has an alternate form where he reverts to his past identity as the ruthless, destructive Tyrant Overlord Killidia, which he can temporarily postpone by consuming a whole meal... though by the end it stops being adequate, and he needs to eat increasingly larger portions to keep Killidia at bay. Coming to accept his past identity without giving in to his urges is what causes Killidia to become his Super Mode.
  • It is revealed in .hack//G.U. 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. Even if all it did was make him look pathetic against the final boss...
    • Haseo's Avatar, Skeith, is also portrayed as this, although Haseo usually does a better job of controlling him than normal for the trope. Skeith is seriously scary when out of control, his actions being the only thing in the games that actually seem to frighten Haseo.
  • Hawke from the Dragon Age II "Destiny" trailer exhibits this, gaining Red Eyes, Take Warning when he resorts to Blood Magic to Curb-Stomp Battle the Arishok.
    • Similarly, any time a Mage Hawke uses Blood Magic in-game, it could be seen as tapping into this.
    • Anders has one in the Spirit of Justice, constantly having to fight to maintain control after his own anger corrupted it into a Demon of Vengeance. When he loses control, he gains Glowing Eyes of Doom, a Booming voice, Volcanic Veins and a Battle Aura.
  • In Dragon Ball Xenoverse, the villains Towa and Demigra have the power to bestow a dark power-up (officially dubbed "Villainous Mode") as part of their attempts to alter history. Most of they time they give it to characters who are already evil, but this trope is played straight the few times they inflict it on the heroes. The most prominent example comes near the end of the game when Demigra takes control Future Trunks thinking that the hero won't be able to hurt his/her own friend; Trunks maintains enough control to ask you not to hold back.
  • In Fallout: New Vegas we have Lily, a Nightkin who used to be a kindly old grandma before being mutated into a hulking blue monster. For the most part, she still acts like her old self, but all Nightkin suffer from schizophrenia. Lily's manifests as "Leo", a being only Lily can see who tells her to do bad things. If Lily is taken down to a quarter of her health, Leo will take over and go on a murderous rampage until every enemy in the area is dead. After witnessing this once, you can learn that she has been only taking half-doses of her medication because it makes the memories of her old life fuzzy. You can convince her to take a full dose (which will stop Leo's rampages but give her a drop in stats), or go off her meds entirely (which will boost her stats but make Leo come out at half health).
  • In Fairy Fencer F, performing a Fusion Dance with the Vile God always results in this, whether it be due to the Vile God being in full control of the fused body or simply corrupting the fusee's own personality. Both times this occurs, the result is the Final Boss of the route.
  • Fighters Destiny has a clown character, and there's a cheat you can use which turns him into a werewolf.
  • Final Fantasy:
    • 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 with a chainsaw and Chaos, the Big Bad of the first game in the series.
    • Terra's Esper form seems to be this in Dissidia Final Fantasy, as when she goes into it during the plot, she suddenly loses control and ends up fighting the other heroes.
    • From Final Fantasy XIV you have Fray who is a part of you the player character in the Dark Knight quest line. He teaches you how to use the powers of darkness and your own negative emotions to brutally slay your adversaries, and his influence makes you more abrasive and quick to anger in your character's dialogue. Downplayed in that he isn't necessarily evil, but more of a manifestation of all of your frustration over the fact that for all of your Primal slaying heroics and general willingness to help the people of Eorzea with even the most mundane tasks, you're often rewarded with barely a thanks if you're lucky and jack squat if you aren't so fortunate. He would rather get you to just leave the people to sort out their own problems instead of having to come crawling back to you to save them yet again, or whenever they need something to get done that they're unable to do for themselves.
  • Happens sometimes in the Fire Emblem series.
    • Lyon in Fire Emblem: The Sacred Stones gains this as a result of tapping into the Dark Stone, in Ephraim's route. (In Eirika's route, the power within the Dark Stone outright possesses him.)
    • General Gawain aka Ike and Mist's father Greil in Fire Emblem: Path of Radiance was already the strongest swordsman in Tellius before he took up the Fire Emblem; afterwards, it made him outright unstoppable, and uncontrollably bloodthirsty, until his wife Elena sacrificed herself to pull the Fire Emblem out of his hand.
    • The Death Knight in Fire Emblem: Three Houses turns out to be this for Jeritza, manifesting for the first time in his teenager days when he was known as Emile. When his father decided to get Emile's half-sister, Mercedes, to marry for producing Crest-bearing offspring, Emile slipped into a blind rage and killed him along with a good part of his household. Since that time he's been struggling with his Death Knight persona activating every once in a while and turning Jeritza/Emile into a nigh-unstoppable bloodthirsty killing machine. He can overcome it through love and compassion of his support partners on the Black Eagles route (the only route he is playable on), and in his paired ending with Mercedes — if she was recruited into the party — he sheds it altogether, undergoing willing imprisonment as his atonement.
  • Playable characters Dante, Lucia, Nero, Vergil and Trish from the Devil May Cry series all can transform into a demonic version of themselves with stronger attacks and health regeneration. In Devil May Cry 2 this becomes easy, with the characters' demon forms not being thrown back, halted or even slowed by enemy attacks.
  • Elena's alternate personality Millenia from Grandia II.
  • This is the reason the quaggan have survived in the Post Apocalyptic world of Guild Wars 2 despite being Actual Pacifists; actually manage to piss them off, and they turn into what is best described as a cross between an orca and a bulette, with absolutely no regard for their safety or collateral damage. And when they calm down, they'll apologize for it.
  • Dizzy from Guilty Gear has a similar problem with one of her sentient wings. She's VERY powerful and unleashing her true powers causes her to lose control to her evil wing, Necro, whose motto is "Destroy everything!". With Dizzy being a Friend to All Living Things this really troubles her. Not that the other wing, Undine, is much better. Unlike Necro, she won't attack anyone who comes within reach randomly, but she will annihilate anyone she perceives as even the slightest threat to Dizzy without even a second thought... and her definition of "threat" is just a little bit too broad for Dizzy's tastes. Undine is the wing that unleashes Dizzy's version of Gamma Ray... that says it all. Oh, and her tail has a will of its own too and often eats anything within biting reach.
  • Dark Jak from Jak and Daxter, after being exposed to Dark Eco.
  • Kingdom Hearts:
    • The Anti-Form Drive Form from Kingdom Hearts II subverts this trope as it's actually a penalty form (at best Awesome, but Impractical) to discourage overuse of the Drive Forms; it can only be triggered randomly (chance determined by a hidden "Anti-Point" mechanic) or by activating any form but Final in battle with the ability Light & Darkness active. 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 blitzing frenzy of clawing, kicking, and firing dark energy blasts. The inability to heal, gain experience, or really do anything else makes this form a liability. Also, Sora takes 50% more damage while in this form and can't revert until the drive gauge expires or he leaves the level.
    • Riku, on the other hand, plays this trope straight in four of the gamesnote , but primarily in Kingdom Hearts: Chain of Memories when you can play as him and "Dark Mode" is one of his key abilities. Interestingly, he no longer has one as of Dream Drop Distance, but only because his control over his dark powers has improved to the point where he can use them freely without transforming.
    • Kingdom Hearts III plays it straight for Sora by allowing him to willingly transform into Rage Form as a situation command when his health is below 25%. It locks out his ability to use magic, items and summons as before, but gives him overwhelming power and speed to compensate. Additionally, Rage!Sora is capable of wielding a Keyblade, and has access to its own unique finishers, Limits and Shotlock. It will also mitigate any previous damage dealt to Sora by restoring him to full health upon transformation. Best of all, you can keep your party members who can also still heal you with their own abilities and items. This form is so powerful that Sora was able to critically injure Xehanort, who forcibly transformed him into this state by extracting his Light side, despite the latter having the χ-Blade and the full power of Kingdom Hearts at his disposal. According to Word of God, the difference between Rage and Anti is that Anti is a form Sora takes on when his heart is completely stained by darkness and is driven by instinct. Rage, on the other hand, is triggered by Sora's raw fury and anger.
  • 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-restraint and will attack anything on sight.
    • Leona also fits this trope, sometimes even more perfectly than Iori, because 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.
  • Rean Schwarzer from The Legend of Heroes: Trails of Cold Steel has a hidden power located near his chest that whenever he loses control of his own self, he ends up becoming a guy clad in evil aura and only knows to kill the opponent. The adults tell him to go master it already so that he can control it and use it for his own, which he manages to do in Cold Steel II. By Cold Steel III however, he's losing control over it because it's growing too powerful and Rean becoming even more stressed out that the one time he doesn't want to lose control over it, he ends up giving in to it and ends up slaying the beast that was holding back the curse of Erebonia.
  • Legend of Mana:
    • Subverted Trope with Blackpearl, whose powerful form is actually how she was originally, before trauma-induced amnesia turned her into Pearl.
    • The Mana Goddess also has one, and this is the reason why the world is so messed up.
  • Dark Spyro in The Legend of Spyro series is Exactly What It Says on the Tin; Spyro's eyes turn white and his body gets covered in a flowing dark energy (that has a habit of clouding up the camera when gliding) and gives Spyro the fury element. It gets triggered when Spyro is overwhelmed in sadness, anger, or just a plain ol' Heroic BSoD. However, in The Eternal Night you can flicker it on and off at will in New Game+ (even in cutscenes!). He's shown to mostly have control over it though, as seen in Dawn of the Dragon.
  • The Fierce Deity Mask ("Oni Mask" in Japan) in The Legend of Zelda: Majora's Mask turns Link from this into this. It's given to Link by (a representation of) Majora's Mask itself so they can play a twisted game of tag. The mask is such a Game-Breaker that you're only allowed to use it in boss rooms.
  • So, in Mary Skelter: Nightmares, the Blood Maidens have the ability to go into a so called "Massacre Mode" ("Genocide" in the original Japanese version), which is kinda like one of these, making them far more powerful and aggressive when coming into contact with large amounts of Marchen blood. However, said monster blood, along with mental stress, builds up a form of corruption, and if it becomes too great, they will enter their real Superpowered Evil Side, Blood Skelter, which makes them go completely Ax-Crazy, communicating solely in pained screams and some of the most insane laughter you've ever heard. Good thing Jack's around to keep them out of it.
    • Speaking of Jack, his Nightmare self in Mary Skelter 2 gains a so-called "Ripper Mode", attained when his heart rate gauge fills up too much. The Marchen imitating his human self also seems to have it, turning its hair black and and implying that Jack may have it even normally. Either way, this is especially bad, because 1) Nightmares are freaking strong already, and 2) the only thing keeping him from a Face–Heel Turn is a psychic link with Otsuu, but if he goes all Jack the Ripper, she very much risks going into Blood Skelter herself. Well that's fun.
  • Mega Man 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 regains control after a while.
    • The fight against Dark Rock in Battle Network 4 does the same, using every chip the player had ever used, including Navi summon chips and Giga Chips, and also can use all the Program Advances you've performed up to the point you fight it. Unlike the player version, there's no warning when it uses them.
    • Chaos Shadow Soul in Battle Network 5 makes MegaMan completely invincible and uncontrollable as the AI attempts to duplicate the player's fighting style.
  • In Mega Man Starforce Pat has a personality disorder. He'll randomly go into an evil state named "Rey" and punch someone. This foreshadows him fusing with Gemini and becoming Gemini Sparks W and B.
  • Zero of the Mega Man X series gains several powerful new abilities when he is exposed to large quantities of The Virus. When he is fully awakened by the Sigma or Zero Virus, he loses all of his emotions and his personality shifts to the that of a cold-blooded killer.
  • In Metal Gear Rising: Revengeance, Raiden recovers from a devastating Heroic BSoD by tapping into his "Jack the Ripper" Child Soldier personality, turning him into an Ax-Crazy berserker who takes joy in inflicting pain. After the ensuing fight, Raiden can use Ripper Mode whenever his Blade Gauge is full, increasing his attack power at the cost of constant Blade Gauge drain.
  • In Metroid Prime 3: Corruption, Samus gets the ability to enter Hypermode, fuelled by the evil substance known as Phazon. Staying in this mode for too long corrupts her, leading to a Non Standard Game Over, specifically turning into another Dark Samus.
  • Neptunia:
    • Some of the HDD forms have this going on, as it not only boosts the CPUs' power but also noticeably changes their personalities (even if they're admittedly not evil per se). Noire for instance becomes more brash and cocky upon transformation, Blanc meanwhile becomes more rage-prone and aggressive and Vert herself gets more aloof and haughty. Plutia in Hyperdimension Neptunia Victory plays this more straight, becoming a full-blown sadist as Iris Heart who has no issues harming anybody physically, emotionally or sexually.
    • The Chaos forms from Chaos Chanpuru play this trope more straight than the above examples.
  • Then there's the Slayer's Expy, the Ravenous Incarnation from Neverwinter Nights 2: Mask of the Betrayer. The Spirit-Eater curse can grant some pretty incredible powers if you feed enough...problem being that the curse is, you know, a curse - an utterly empty blight upon the spirit backed by divine malice - and will overcome you, drive you insane, push you to devour the spirits of all you see in an animal frenzy, and finally obliterate you so entirely that even your soul is destroyed forever. Giving in to your hunger for spirits to get more power speeds up that process a lot.
  • 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.
  • Every single main character in Persona 4 must be recruited by defeating their Super-Powered Evil Side, or more accurately, their Shadow Archetype: the embodiment of all the things about themselves they can't stand to admit. The shadows have grown immensely powerful out of all proportion simply because being denied makes them stronger; once accepted, they become much weaker and "tame."
    • The series also gives us Black Frost—the horrific result of adorable Mascot Mook Jack Frost remembering he's supposed to be a demon after all and invoking The Power of Hate. The process apparently renders him awesomely more powerful... and much more evil. Unless you're playing Devil Survivor, in which case it turns him into a Pun-spewing Magical Girl-esque warrior of love and justice. ...And just as awesomely powerful.
    • Persona 5 has the traitor. Every Persona-using character has a costume which appears on their body when they enter the Metaverse. The traitor has two. One is a campy outfit styled after a "hero of justice", which he wears when summoning Robin Hood. This form has all the normal powers of a Persona-user. Should he switch to his other Persona, Loki, he'll change into a black, armoured outfit which adds a neck brace and helmet to the magical masks. This form has some abilities which most Persona-users definitely do not have, like inducing psychosis in a target and amplifying attack power massively in exchange for a defence drop. He's also a lot more open about how sadistic and angry he is when in this form, culminating in him using his powers on himself so that he can tear the protagonist apart with no remorse.
  • It may not be on quite the same level, but in Pokémon Colosseum, there's a random chance that a Shadow Pokémon might go into 'Hyper Mode' during a battle. The Pokémon in question will be surrounded 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 its senses.
    • A truer example would be Hoopa from the Gen VI games, who has a compact "Confined" form and a monstrous "Unbound" form where its Psychic/Ghost typing changes to Psychic/Dark. The "Evil" part is more prevalent in the film Pokémon: Hoopa and the Clash of Ages, where the Unbound side becomes an Enemy Without.
    • Flavor text implies that Mega Evolution forms tend towards this trope.
  • Primal has its main character who personifies this when in any of her monster forms.
  • In Prince of Persia: The Two Thrones, 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).
  • From La Pucelle: Tactics, Croix has his Super-Powered Evil Side as the Dark Prince serving the fallen angel Calamity.
  • 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.
  • The hero of Shining Tears is normally a timid amnesiac with a dislike for fighting, but when somebody else puts on the other matching ring of power he turns into two super-powered sides, one is a moral knight of justice while the other is an insane Omnicidal Maniac Blood Knight.
  • Sonic the Hedgehog:
    • Sonic 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. This exception is lampshaded after it is revealed that Chip is actually Light Gaia, a benevolent spirit, who is guarding the earth. Sonic then asks, if it could be Chip who keeps him from succumbing to Dark Gaia and becoming evil when in Werehog form, to which Chip replies that he has nothing to do with him, it's Sonic's kind heart alone which lets him keep his sanity.
    • Sonic and the Secret Rings introduced the Darkspine form, which Sonic transforms into by using the World Rings of rage, hatred and sadness.
  • Soul Series:
    • 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 armor 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 'roids).
  • Spider-Man:
    • As said in comics, any game that has the option of the black suit has it as this. In games such as Spider-Man 3 and Spider-Man: Web of Shadows, his attacks become more violent and aggressive, usually with Combat Tentacles and spike tendrils.
    • Subverted in Spider-Man: Shattered Dimensions: the Ultimate Universe Spidey (who is bonded with the symbiote again) is the kindest of the Spideys, though he possesses a "rage mode" in which he becomes more scary looking and his attacks are more devastating. His comments are actually the opposite, however, and he'll say things like "Yeah, let's have some good old fashioned RAGE!" and "Raaage! I'm not actually angry, I just like saying it." But it's justified, since Madame Web is using her powers to keep the suit from taking over.
  • 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 Star Wars: The Force Unleashed: Ultimate Sith Edition, you go into the ruins of the Jedi temple and eventually fight your Super-Powered Evil Side.
  • Ryu, from the Street Fighter series, 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 Japanese version) 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 2 and 3, Evil Ryu is actually a secret, playable character (a dark-skinned, red-eyed version of Ryu with some additional attacks that were borrowed from Akuma).
    • Ryu's Super-Powered 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.
    • Evil Ryu returns to the SF storyline through Super Street Fighter IV, where he's a playable character. This time he has gone from merely a dark-skinned, red-eyed Ryu to a borderline Person of Mass Destruction with a kanji carved on his flesh and a glowing orb where his heart should be. Making Evil Ryu return to the surface was a plot point in the Ties that Bind tie-in anime. It almost works.
    • Oni represents this to Akuma. Whereas Akuma does have some degree of control over the Satsui no Hado, Oni is Akuma when the Killing Intent finally consumes him. Oni drops the moral code of only fighting worthy opponents that Akuma held to, and will fight, and even kill, anybody and everybody he comes across. Oni is the one thing Akuma doesn't want to become. And the most terrifying thing is that Oni is miles above most other fighters, with only a handful including Cody and Gouken able to challenge him.
  • The Suffering initially plays this straight with a "primal form" that shreds enemies but damages your Karma Meter. However, it's subverted twice over. First, you learn that you're merely "under the delusion" that you turn into a monster when you go berserk. Then, the final boss proposes to "cure you"—and it sort of works. In the sequel, you can transform without harm, even if you're playing as a good guy.
  • 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 Super-Powered Evil Side is a great way to balance The High Queen and her darker counterpart, leading to a natural aloof regality.
  • In Super Smash Bros. Brawl, some of the Final Smashes have this effect.
    • Bowser's Final Smash transforms him into the even more monstrous Giga Bowser. Whether or not Bowser was evil to begin with depends on the game you reference...
    • Luigi's Final Smash, according to its trophies, is "a reflection of the Dark Side he embraced in his brother's shadow."
  • The God of War Melqart in Tears to Tiara 2, who Hamil summons to take possession of his body by promising the blood and destruction of The Holy Empire. Ennead and Monomack describes the technique as going berserk. At the Ba'al festival, Melqart wipes out an entire squad of Golmes in one blow, fights without concern for collateral damage, laughs as he effortlessly deflects fire arrows of imperial soldiers, and forgets all about protecting Tart until she sings. Not that she was actually in any danger by that point.
  • Almost every member of the Mishima family in the Tekken series is affected by the Devil's Blood, a curse that while it makes them stronger and grants them demonic powers, at cost of their humanity. Also Ogre/True Ogre.The Devil's blood affects the personality of those inflicted, and it's virulent where the host struggles to keep control.
    • Devil Jin is esentially Jin Kazama overcome by the Devil Gene, unlike his human form, he's ruthless,cruel and sadistic, enjoying seeing his foes suffer, his alter ego, Jin Kazama tries at all costs to prevent the Devil's blood to take control.
    • Kazuya Mishima was originally stricken when he thrown off the cliff by his father in order to survive, originally Kazuya was a good man with a kind heart, but the Devil's blood slowly consumed him, until Jun Kazama awakened in Kazuya his good side that fought off his demonic side. After Tekken 2, though, Kazuya's good side is suppressed by the Devil's blood and Kazuya made an agreement with it and he's able to control the form as he pleases. A shred of his humanity can be seen in his T5 ending where he defeats his grandfather and holds him in his arms, smiling at him and remembering his few happy childhood moments, before the Devil's blood takes control and kills him.
    • Heihachi Mishima is just that evil, he doesn't need an evil side to get more evil, super powered or kick ass.
    • Jinpachi, who is affected by the Devil's blood, turned into a demon after he died underground under Hon-maru, imprisoned by his son Heihachi, after the events of Tekken 4 Jinpachi is released, and 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.
    • Jun Kazama counts as well. Turns out she's Unknown, a superpowered... well, where she sits on good and evil hadn't been established, but she basically turns into Venom and becomes a little more dangerous.
  • In Tower Of Fortune, The protagonist automatically transforms into a hulking, angry giant at 100% rage, with an 80% chance to hit (as opposed to the usual 45-65% range) and vicious, bloodthristy attacks from punching to sonic-screaming to pouncing on them and ripping their throats out with each subsequent hit. You can abstain from this mode with some skills or prolong the fury with others. How and why your otherwise generic warrior can become a were-giant is a mystery explained in the prequels.
  • In Undertale, there are two examples:
    • The Player Character, The Human Child/Frisk has two, the first is The Fallen Child, the spirit of the game's Grater Scope Villain, the second is you, not The Fallen Child, you, the person playing the game, should you embark on the more malevolent routes and specially Genocide, due to the game intense Meta nature, that's right, in Undertale, YOU are the Super Powered Evil Side. Don't you feel special?
    • Asriel is a Posthumous Character in the backstory who was the Nice Guy crown prince and son of Toriel and Asgore. After dying tragically, they found themselves brought back as a souless ghost possessing a golden flower, but because of said soulessness, they eventually degenerated into The Sociopath known as Flowey.
  • At one point in Wild AR Ms 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 Eldritch Abomination responsible for devastating the world centuries ago, Lord Blazer. This leaves Ashley with the holy sword. Guess who wins the resulting boss fight.
  • 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. Shown in a flashback to defeat a half dozen Gears, unarmed, with a single hit each.
    • When Id manifests, even Weltall gets a Super-Powered Evil Side, transforming into Weltall-Id.
    • This is subject to the variation mentioned at the top of the page. Even though Id doesn't get as much screen time as his alter-ego, Fei is a personality built on top of Id and the Coward (the original personality). Id is able to access the memories of the Contact, which Fei is only able to do near the end of the game.
    • Grahf plays this role in two ways. He is the metaphysical alter-ego of Lacan, a previous incarnation of Fei, and the (current) physical alter-ego of Khan Wong, Fei's father.
  • Daze Before Christmas has a power-up that can turn Santa into a monster.
  • Giana Sisters DS: Strongly implied by the credits. Punk Giana can bust blocks, shoot fireballs, and survive a hit, compared to Normal Giana... who can do none of those things.
  • In Twisted Wonderland, magic users who either accumulate too much blot or become overwhelmend by their negative emotions will Overblot, where their magic increases in power, a Guardian Entity appears before them, and they act in an uncontrollable, destructive manner. If they aren't defeated in time, the Overbotted person may irreversably turn into a monster. This event happens to a member belonging to each of Night Ravens College's dorms, all but one of them being the dorm heads.

    Visual Novels 
  • Akai Ito: Tsuzura's fox-mage mode. It's even played as what-do-you-mean-it's-not-rape the first time she taps into it and can't control it.
  • Aoi Shiro: All who wield the <<Sword>> are prone to this, but Sword-Demon Kaya (your Back from the Dead Rather Wrongly big-sister-figure) especially... leading to a lot of Nightmare Fuel Bad Ending.
  • Danganronpa: Trigger Happy Havoc plays with the trope.
  • DRAM Atical Murder:
    • Aoba Seragaki has the ability to control other people and enter their minds with his voice alone but the more he uses this ability, the more a darker, more powerful side of him that wants to destroy everything in its path threatens to consume him completely. In the True Ending, though, it's revealed that his "evil" side was actually more lonely and misunderstood than evil and happily remerges with Aoba after Aoba fully remembers and accepts him.
    • Aoba's potential Love Interest Koujaku turns out to have one as well. His Power Tattoos cause him to go into a massive Unstoppable Rage in the Bad Ending, reducing his mind to a bestial state. This is also what caused the death of his family when he was younger.
  • Hatoful Boyfriend has, during Anghel's endgame, a boss fight with Himnesia, which looks like a Giant Space Flea from Nowhere. But dissect the things Anghel says there and elsewhere, and other characters' motivations, and official art, and some fans come to the conclusion that Himnesia is his evil side. And that he's a representation of the plague implanted in Anghel.
  • Many characters in the Nasuverse have an "inversion impulse", the desire to go psycho and unleash the full power their bitchin' superpowers on the world in an orgy of murder, due to their monstorous bloodlines.
    • The Big Bad in the Tsukihime fighting game Melty Blood uses his powers to summon Doppelgangers of several characters superpowered evil sides, leading to characters fighting their dark halfs; probably the biggest example being Nanaya Shiki, the evil murderous side of Tohno Shiki from the original VN.
    • One particular exception to this "evil doppelganger made by the Big Bad" is Archetype Earth: She is a fragment of Arcueid subconscious, and if she wakes up and takes over her host, she can show how utterly powerful Arcueid could have been compared to her usual self, such as casually trying to destroy the world on a whim.
    • In the Heaven's Feel route of Fate/stay night, Sakura Matou lets loose a Super-Powered Evil Side powerful enough to kill most of the other participants and create a Super-Powered Evil Side of Saber.

    Web Animation 
  • Shandala in Broken Saints has some serious issues.
  • Dreamscape: Keela's released form, which gives her Black Eyes of Crazy, her scythe grows HUGE, and she turns totally evil.
  • Flippy of Happy Tree Friends subverts this. Whenever he's reminded of the war he served in (strongly implied to be the Vietnam War), his Split Personality appears and starts gleefully and efficently killing everyone around him. However, the episode "Double Whammy Part II" reveals that the good side is just as badass, to the point where he manages to (temporarily) kill the evil side. He just doesn't have a reason to utilise these skills most of the time, lacking the evil side's bloodthirst.
  • Red vs. Blue: A fairly goofy example occurs in episode 40: in order to fight off a horde of "noobs" in Battle Creek, Caboose gets in touch with his "angry side", which results in him gunning down the noobs while shouting bizarre threats like "I will eat your unhappiness!" and "Your toast has been burned, and no amount of scraping will remove the black parts!"
    Caboose: Now I'm thinking of a kitten... covered in spikes... that makes... me... angry... YYAAARRRRGGHHH!

    Web Comics 
  • In Alice and the Nightmare, Alice is implied to have something like this - whenever she gets angry, her eyes start to glow and she spills red dust (sign of dream magic) around. It seems that the medicine she takes daily keeps it at bay.
  • 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.
  • 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.
  • 8-Bit Theater:
    • Black Mage encounters himself in the Castle of Ordeals, where the Light Warriors have to face symbolic representations of their own flaws. However, the only thing that could represent Black Mage's flaw (Pure Evil) was himself, as nothing else was evil enough. Then it turned out that even his own duplicate didn't quite represent some of the more evil things he'd done, which corrected itself as the real Black Mage ran through them by becoming even more evil (as well as powerful). He then absorbed his own evil and power back into himself, eventually unleashing it to destroy four other incredibly evil beings, whose own evil and power he then absorbed, giving him an evil aura as well as incredible magical power.
    • Later omniscient superwizard Sarda (a.k.a. The Omnipotent Jackass) has absorbed Black Mage's Super-Powered Evil Side. Lampshaded thus:
      Sarda: Who knows what kind of sadistic and impossible stuff I'll do now.
  • 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".
  • In Goblins, Dies Horribly has a magical, green arm that acts as a sort of Empathic Weapon most of the time. But when Dies is severely threatened, the arm tends to take over his body and slaughter everything in the immediate vicinity in creatively gruesome ways.
  • While "Fallen Grace" (a.k.a. "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 Hazard's Wake, Araceli has a superpowered dark side that is not necessarily evil, but leads to overkill when it manifests.
  • Played with in Homestuck: both of Gamzee's personalities are Ax-Crazy Omnicidal Maniacs. They're just kept merged and stable due to Gamzee's addiction to sopor slime. Rose's temporary grimdark transformation may also count.
  • 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.
  • Last Res0rt has Jigsaw, since apparently all vampires in her galaxy can transform during their Unstoppable Rage.
  • In some of Zeurel's Original Character Tournament entries such as Law Of Talos and Escape From Nevara, Black Ace is this to Spoiler.
  • Franken from Noblesse slips back to his Mad Scientist persona when he unlocks his power, which allows him to curb stomp absolutely everyone. His Slasher Smile has to be seen to believe it.
  • Subverted in The Order of the Stick: It initially looked like the comic was going down this path when Vaarsuvius made a deal with three fiends 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. The fiends had lied to her in order to induce a nocebo effect.
  • The Nations as People series Polandball has Germany. Though Germany's normally depicted as an amicable Straight Man and elder statesman, when he gets really pissed (usually at Greece for not paying debts or Poland for existing), he morphs into the Reichtangle, an enigmatic figure representing the German Empire. The Reichtangle is a rectangle where everyone else is a ball, and usually appears saying "Guten tag" before murdering everyone else.
  • In Roommates Goblin King Jareth has one. Technically it's his original personality, but his love and gratitude for the girl he choose, the camaraderie he feels for his friends and his own desire to change makes him suppress it. Not that it helps much, even his "Good" side is an "easily entertained but frequently bored trickster" (great intentions but sucks in this whole good thing) the "Evil" one is an "amoral ruthless fae lord" (Fourth-Wall Observer meets The Fatalist and his role in the story tends to be: Villain).
  • Demons in Slightly Damned have a berserk form that they can change into which greatly increases their strength and power at the cost of being consumed by uncontrollable rage such that they attack everything they see (including themselves if they are alone) and usually causing them to die from exhaustion, so they only do this when they are likely to die anyway. Buwaro was born with a condition that causes him to go berserk involuntarily when he isn't asleep or wearing a special pendant.
  • Used in Snowflame: Possessed by the Odd Job God Goddess of Cocaine, Snow Flame is the Super-Powered Evil Side of Fabian Orozco, a former drug trafficker.
  • Trace Legacy of TwoKinds has two of these. Whenever he gets extraordinarily pissed off, his memories of his old life cause a person shift (visually represented by his eyes and part of his hair turning red). However recent comics have seemed to show this side is merging with is current persona. (As the racist evil side is shown defending Keidran, which is something only his normal persona would do.) On the other hand, utilizing Black Magic results a different but even more psychotic personality (visually represented by his eyes and parts of his hair turning black). While Templar!Trace is a complete reversion to his old evil personality and goals, Dark!Trace retains all his current goals and desires... at least at first.
    Templar!Trace: ... they should have a festival for me... These Keidran don't deserve anything.
    Dark!Trace: Are you the one hurting Flora? No matter... I'll just kill you all and sort it out later.
  • Sweet Home: Each infected person develops one of these. They serve as a means of determining exactly how those that were infected will end up mutating. Hyun's in particular is very eager to play mind games with him.

    Web Original 
  • 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 Super-Powered 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.

    Web Videos 
  • Spoony treats Dr. Insano as this in Kickassia.
  • Dark Nella from The Nostalgia Chick. Technically she's supposed to be a Cosmic Horror possessing a clone of Nella, but one episode randomly has Nella start to turn evil again before the Chick forces her glasses back on.
  • In the "Angry Video Game Fag" by Ebeeto, Ebeeto "transforms" into The Angry Video Game Fag whenever he is angered enough. The transformation comes complete with a video-game-inspired cutscene.

    Western Animation 
  • In The Adventures of Teddy Ruxpin, if an Illiper (like Prince Arin and Princess Aruzia) consumes Vitamin Z (an ingredient in the Jungle Grunges' famous gumbo), they are transformed into an armor-clad warrior who is much stronger, but also mindlessly violent, attacking everything and everyone in sight. The transformation wears off by being doused in water. Arin's transformation is dubbed the Iron Warrior, and Aruzia's is the Aluminum Amazon. In "A Race to the Finish", the two of them decide to willingly use this form's power to fight off some of M.A.V.O.'s bad guys, and have to be snapped out of it by having buckets of water thrown at them afterwards. There's still a significant amount of collateral damage caused to the Grunge village.
  • Adventure Time has the Ice King as an odd, somewhat tragic, and not-so-evil example. It's not immediately apparent, but when his backstory is revealed it turns out he used to be a normal, sensitive guy who discovered an ancient crown that gave him magical powers which allowed him to survive The End of the World as We Know It. Unfortunately, it also drove him more and more insane each time he used it, until, by the time of the series, he's locked into his Crazy/Evil Side full-time and can only vaguely recall his own origins and who he used to be.
    • The series also has Sweet P Trunks, the adoptive child of Tree Trunks and Mr. Pig. A humanoid kid who is huge in size and also happens to be The Lich after being turned into a human with the Blood of The Citadel's guardians. While Sweet P is innocent and loving as any child, The Lich is still somewhere inside him, and if he feels cornered and threatened, he will take over. The King of Ooo and Toronto learn this the hard way.
  • In The Amazing World of Gumball, the titular character gets two:
  • A literal form of this is The Batman version of Clayface. Just using his powers turns him insane and monstrous.
  • In the episode Never Fear of The New Batman Adventures (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. Bruce Wayne (in disguise) infiltrates some facility and is caught by the Scarecrow. Bruce awakens in a zoo, where the only exit is next to the crocodiles' cage. From a high hill, the Scarecrow confronts him. Bruce plays dumb, pretending to be a petty thief who was simply snooping around for loose cash. Scarecrow shoots him with a gas gun and then dares him to approach the crocodile cage. Bruce crosses over the cage without fear, and is tackled by the beasts. As he goes under, a red stain dots the water, and the Scarecrow leaves, satisfied. Suddenly, Bruce reemerges from the water, and as one crocodile's body floats up, he walks away looking unharmed. This later worsens as he loses his fear of killing...
  • The 2006 revival of Biker Mice from Mars has Stoker turn into an insane rat-like beast called Stoker Rat.
  • In Dex Hamilton: Alien Entomologist, Zap can turn into a giant destructive bug if his DNA becomes unbalanced.
  • 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 mutant form turns out to be good.
  • Distinctly more of an Superpowered Id than Evil Side, but Freakazoid! is like this to mild-mannered nerd Dexter Douglas.
  • A flashback in episode 19 of Generator Rex reveals that Rex can turn into a savage biomechanical Giant Robot Evo. One of the reasons White Knight is so hard on Rex is that he is afraid of Rex becoming that monster again. Rex himself has no clue he can do this thanks to his amnesia.
  • Grossology: Chester accidentally gave himself one in a freak lab accident — the dark-skinned, black-eyed, and destructive Kid Rot.
  • When audiences found Invader Zim's Robot Buddy GIR cute, the writers created an episode called "GIR Goes Crazy and Stuff", where Zim actually fixes him — and he becomes suddenly destructive and hyper competent, determining the only way to conquer Earth is with Zim out of the picture...
  • The Shadow Thief from Justice League Unlimited was eventually revealed to be the Super-Powered Evil Side of Carter Hall, who subconsciously willed him into existence out of a desire for a villain for him to defeat. He later attempts to kill Green Lantern so that Carter can be with Hawkgirl.
  • Kaeloo: Kaeloo's alternate form, Bad Kaeloo, who has Super Strength and whose actions are beyond Kaeloo's conscious control.
  • 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 Mirror Morality Machine. A lot of this comes from Ron actually being Brilliant, but Lazy and often needing some negative event (such as Kim being in danger) to motivate him; these devices remove the "lazy" part to make him 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...
  • In Kipo and the Age of Wonderbeasts, Kipo discovers that in moments of stress she grows fur and gains superhuman physical abilities. In season two, it's revealed that this is because she has the ability to turn into a Mega Jaguar. However, if she actually transforms, she risks losing her mind to the jaguar's instincts like what happened when her mom turned into the Mega Monkey.
  • My Little Pony: Friendship Is Magic:
    • The central example of this in the show is Princess Luna, whose jealousy and bitterness (and according to Word of God, an inkling of dark magic) transformed her into the evil Nightmare Moon, bent on plunging the world into eternal night so that ponies would have to acknowledge her night's beauty whether they wanted to or not. She snaps out of it after a thousand years of isolation and a magic rainbow to the face.
    • The same thing happens to Rarity in the comics, making the "superpowered" bit all the more obvious as she is able (with some help) to provide a serious challenge to the rest of the cast put together.
    • A dream sequence in "A Royal Problem" introduces Daybreaker, a hypothetical superpowered evil side for Princess Celestia. Unlike Nightmare Moon, the trigger for this transformation is stated to be Celestia realizing that she has the power to do whatever she wants whenever she wants, and all that's stopping her is her caring about others.
    • Dragons are prone to greed, and the greedier they get, the bigger and stronger they get, which makes them even greedier. In "Secret of my Excess", a few extra gifts on his birthday awaken Spike's dragon greed, and he becomes a huge rampaging full-grown dragon taking everything he wants from Ponyville. He snaps out of it when he is reminded of his moment of generosity earlier in the episode.
  • OK K.O.! Let's Be Heroes:
    • K.O. has one named T.K.O., who is a Blood Knight, and is also an Emo Teen parody who steals his mother's eyeshadow and was initially mistaken for an emo phase. He lapses into T.K.O. when he feels helpless or angry. However, T.K.O. is an unusual example in that he's not strictly evil so much as he is rebellious, angry, and violent; on occasions when that violence is aimed in a reasonable and useful direction, he can be something approaching heroic. K.O. and T.K.O. can interact with each other inside of their mind.
    • His father has one of these as well, apparently due to having experimented on himself. Unlike K.O., he's initially unaware of it, having absolutely no memory of anything that happens while his alter ego is in control.
    • In the penultimate episode, both are dealt with permanently. When Shadowy reveals that he was just using T.K.O. all along, T.K.O. promptly punches him out of Venomous and stomps him into nothing. K.O. meanwhile finally accepts that T.K.O. isn't some parasite forced on him but rather part of himself that he had always tried to deny. T.K.O. is K.O. and always has been. This leads to K.O. and T.K.O. undergoing a Split-Personality Merge.
  • In an episode of The Real Ghostbusters, an accident causes Slimer to start turning into a huge, demonic, bestial version of himself that the heroes name "Big Green", who sort of becomes a type of Split Personality. Once they find out what happened, Egon manages to separate them into two ghosts, and then defeat Big Green without hurting Slimer.
  • Teen Titans:
    • 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 (which makes no sense considering that they also changed Adonis), 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. He does seem to have acquired a degree of control over it later on, though he rarely uses it. In its first appearance, though, the Beast is more like the Hulk—not evil, but uncontrollable, volatile, and dangerous.
    • There's Raven's "Daddy Issues". Dr. Light should really have backed off like she warned him.
  • Mike of Total Drama Revenge of the Island has an extremely comical case of multiple personality disorder, then in Total Drama All-Stars it's revealed that he has a sinister, Matthew Patel-like personality named Mal (known as "The Malevolent One") that his other personalities have previously kept at bay. The question of whether Mike is their body's original personality or Mal is the original and Mike is Mal's Helpless Good Side who took control is brought up, but not resolved.
  • Transformers:
    • An Applied Phlebotinum instance is Rhinox being turned into a Predacon in the 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?
    • Megatron clearly learned his lesson from his ill-fated attempt at turning Rhinox evil in Beast Wars. He placed a Restraining Bolt in Tankor that would immobilize him if he ever tried to directly attack Megatron.
    • 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 an Evil Plan 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.
  • In Winx Club, Lord Darkar uses his dark magic to turn Bloom into her Superpowered Evil Side in the form of Dark Bloom, who is Bloom with a black version of her fairy outfit and demonic yellow eyes. And he does it twice with her in the second season. Once to have her ship off Alfea's Codex piece to him through his Team Pet Kerbog, and again to have her help him open the portal to Realix with the four Codex pieces where he can acquire the Ultimate Power. Both times had her turned back to normal in the end - for the first time, the impostor Professor Avalon used his wand to lift the spell, and for the second time, it was Prince Sky who changed her back through his words of kindness, especially his "I love you" line, after which she returns the Ultimate Power to its rightful place to Darkar's shock and dismay.
  • One episode of Xiaolin Showdown was about Dojo transforming into an evil monster and destroying everything in his path after Omi accidentally frees him from his cage.
  • Coop on Yin Yang Yo!. In his regular form, he's weak and nerdy. However, when he's infused with The Night Master's power, he becomes a match for Yin and Yang. Later on, Yin also gets a evil side to her when some of the Night Master's power corrupts her.


Video Example(s):

Alternative Title(s): Superpowered Alter Id, Superpowered Neutral Side, Jekyll And Super Hyde


Sasuke's cursed mark

The first time Sasuke used the Curse Mark, it turned the quiet, caring loner into a sadistic maniac out to massacre the Sound Ninja Zaku Abumi because the latter hurt Sasuke's teammate Sakura Haruno.

How well does it match the trope?

5 (4 votes)

Example of:

Main / SuperpoweredEvilSide

Media sources:

Main / SuperpoweredEvilSide