History Main / TheJekyllIsAJerk

** [[Characters/MarvelComicsNormanOsborn Norman Osborn]] is often portrayed as just as despicable as his AxCrazy Green Goblin persona, especially following his comeback in the late 1990s, being a CorruptCorporateExecutive who puts profits over people every time. During the Dark Reign event, he became director of SHIELD, renaming it to HAMMER and creating his own Dark Avengers, all while blaming Tony Stark for the Skrull invasion, and made numerous attempts to kill his own son Harry. Even when stripped of his powers and psychosis at the end of ''ComicBook/SuperiorSpiderMan'', Norman became an international arms dealer heading a crew of goblin-themed mercenaries. Even when he was cured during ''ComicBook/TheAmazingSpiderMan2018'' and genuinely makes an effort to atone, he still teamed up with Wilson Fisk AKA ''[[Characters/MarvelComicsTheKingpin The Kingpin]]'' in an effort to try and take down one of Spidey's rogues.

* ''ComicBook/XMen'': In ''ComicBook/ImmortalXMen'', a flashback reveals that whatever Apocalypse did to the original Nathaniel Essex gave Essex an alter that strongly resembled the future Mr. Sinister. The original Nathaniel Essex wasn't a good or nice man, being a narcissistic epitome of Victorian colonialism and cultural posturing. The alter simply acted on his repressed urges, leading him to go out at nights to commit random murders.

* ''WesternAnimation/Ducktales1987'': A unique variation in the episode "Dr. Jekyll and Mr. [=McDuck=]" where it is mentioned that this version of Jekyll was a sour, friendless loner who developed a formula to make himself likable, in effect turning the Hyde persona into the ''nice'' half. Unfortunately, the formula worked ''too'' well, resulting in Jekyll (and later Scrooge) becoming a laughing, crazy OverlyGenerousFool that was a public nuisance rather than a murderer.

* ''WesternAnimation/Ducktales1992'': A unique variation in the episode "Dr. Jekyll and Mr. [=McDuck=]" where it is mentioned that this version of Jekyll was a sour, friendless loner who developed a formula to make himself likable, in effect turning the Hyde persona into the ''nice'' half. Unfortunately, the formula worked ''too'' well, resulting in Jekyll (and later Scrooge) becoming a laughing, crazy OverGenerousFool that was a public nuisance rather than a murderer.

** The "Lizard's Tale" arc of ''The Spectacular Spider-Man'' revealed that Dr. Curt Connors could always control the Lizard, he simply chose not to because he secretly enjoyed being evil through an alter-ego (which he could have stopped at any time) that got all the blame; this has been ignored by all subsequent stories outside of a possible nebulous reference during "Brand New Day."

* ''Literature/TheStrangeCaseOfDrJekyllAndMrHyde'', despite popular perception of its central trope, plays with this. Dr. Jekyll is a respectable gentleman and good friends with the narrator Mr. Utterson while Mr. Hyde would trample a girl and feel no remorse, but as Jekyll admits in his final confession, while Hyde is indeed pure evil, Jekyll isn't pure good. While Jekyll's original idea for the potion was to separate his good and evil halves so the good one wouldn't be tempted by evil and the bad one wouldn't be bothered by a conscience, that's not how it ended up happening; the evil half lost the conscience, but the good half didn't lose the temptation, something Jekyll speculates to be because he because he was SecretlySelfish in consuming the potion so he could indulge in evil. Jekyll is perfectly happy to allow Hyde to run riot and satisfy his evil impulses until Hyde crosses the MoralEventHorizon in a way Jekyll couldn't ignore (murdering Danvers Carew for no reason), at which point he does stop taking the potion, but by that point it's too late and 'Hyde' has become the default persona, so he needs the potion to become Jekyll. In the end, Hyde's relationship to Jekyll is less a split personality than a drug addiction.

** [[Characters/MarvelComicsNormanOsborn Norman Osborn]] is often portrayed as just as despicable as his AxCrazy Green Goblin persona, especially following his comeback in the late 1990s, being a CorruptCorporateExecutive who puts profits over people every time. During the Dark Reign event, he became director of SHIELD, renaming it to HAMMER and creating his own Dark Avengers, all while blaming Tony Stark for the Skrull invasion, and made numerous attempts to kill his own son Harry. Even when stripped of his powers and psychosis at the end of ''Superior Spider-Man'', Norman became an international arms dealer heading a crew of goblin-themed mercenaries. Even when he was cured during ''ComicBook/TheAmazingSpiderMan2018'' and genuinely makes an effort to atone, he still teamed up with Wilson Fisk AKA ''The Kingpin'' in an effort to try and take down one of Spidey's rogues.

* ''Comicbook/TheSentry'': The Sentry is a NighInvulnerable PhysicalGod who seems like an IdealHero at face value but is actually very dangerous due to his mental instability coupled with his power level. The Sentry's greatest enemy and his evil split personality is an EldritchAbomination called The Void, which is equal in power and will kill a person whenever the Sentry saves someone. The original person, Bob Reynolds, was a mentally unstable junkie who accidentally drank SuperSerum when looking for a fix, and the resulting problems may be a result of Reynolds repressing the real circumstances of how he got his powers. Essentially, the serum made him the ultimate RealityWarper and he created both a (warped) version of the hero he wanted to be and a monstrous reflection of how he actually thought of himself.

* ''Series/MoonKnight'': {{Downplayed|Trope}} and [[ZigZaggingTrope ZigZagged]]. [[spoiler:While abrasive mercenary/superhero Marc is initially framed as the alter to gentle AudienceSurrogate Steven, who indulges in violent, dangerous situations while Steven sleeps, it turns out ''Marc'' is the original personality while Steven is the alter. However, Marc is also gradually shown to be more of an AntiHero with a DarkAndTroubledPast, so by the time Steven discovers Marc is the original personality, he doesn't find Marc odious at all, and in fact helps him face his trauma. And then there's that [[AlternateIdentityAmnesia secret]] [[AmbiguouslyEvil third personality]]...]]

* ''WesternAnimation/VanHelsingTheLondonAssignment'': The original Dr. Jekyll and Mr Hyde feature as the main villains of the story, with both being monstrous in their own way. While Hyde is still the murderous brute he was in the live-action film, Jekyll is a self-deluding stalker who's been more than willing to profit from Hyde's murders in order to advance his own scheme.

* ''VideoGame/SaintsRowIV'': Shortly after being rescued from her MindPrison, Shaundi manifests a LiteralSplitPersonality in the virtual world. Known as "Fun Shaundi," this new self is [[IHatePastMe everything that Shaundi despises about her past]] and is treated like Mr Hyde because of it, even though Fun Shaundi is really just a friendly but irresponsible hedonist, just as Shaundi herself used to be in ''VideoGame/SaintsRow2''. By contrast, Present Shaundi is cold, short-tempered, acerbic, and more than a little bloodthirsty, reflecting the character's desperate need to make up for her perceived flaws.

* ''Literature/TheStrangeCaseOfDrJekyllAndMrHyde'': Contrary to the common tropes of the story's adaptations, the original Dr. Jekyll was secretly quite selfish and hypocritical. Indeed, once he moved beyond the initial experiment phase, Hyde was his entertainment and partner in crime: with Hyde's new appearance and guiltless personality, Jekyll could indulge himself in criminal adventures without putting his good standing or his good nature at risk. It wasn't until Jekyll lost control of Hyde's instincts that the new persona became the destructive, monstrous split personality that everyone's familiar with, leaving Jekyll struggling to rein him.

Please note that this trope doesn't concern itself with the adaptation-induced misconception that the relationship between "Jekyll" and "Hyde" are as clear apart as [[BlackAndWhiteMorality back and white]] -- not even in cases where the roles of the pair are switched -- nor is it about adaptations of the story in general. Rather, this trope explores such instances where the typical morality associated with split personalities begins to blur...

* ''ComicBook/TheMask'': LossOfInhibitions or not, quite a few Mask users are seen to be [[{{Jerkass}} total jerks]] even without the Mask, most prominently Stanley Ipkiss. Unlike his movie counterpart (who had the benefit of both AdaptationalHeroism and AdaptationalNiceGuy) Stanley was petty, jerkish, and cowardly; becoming Big Head just made his sick dreams come true and while he's nowhere near as AxCrazy as Big Head, he's enough of a PsychopathicManchild to gloat over what he did even once he removed the Mask.

** [[Characters/MarvelComicsNormanOsborn Norman Osborn]] is often portrayed as just as despicable as his AxCrazy Green Goblin persona, especially following his comeback in the late 1990s, being a CorruptCorporateExecutive who puts profits over people every time. During the Dark Reign event, he became director of SHIELD, renaming it to HAMMER and creating his own Dark Avengers, all while blaming Tony Stark for the Skrull invasion, and made numerous attempts to kill his own son Harry. Even when stripped of his powers and psychosis at the end of ''Superior Spider-Man'', Norman became an international arms-dealer heading a crew of goblin-themed mercenaries. Even when he was cured during ''ComicBook/TheAmazingSpiderMan2018'' and genuinely makes an effort to atone, he still teamed up with Wilson Fisk AKA ''The Kingpin'' in an effort to try and take down one of Spidey's rogues.

* ''Series/{{Misfits}}:'' Season 3 introduces Rudy, who has the Storm-imbued ability to manifest another persona as a LiteralSplitPersonality. Though Rudy treats his other self like a disruptive menace, it's clear that Rudy 2 is actually the nicer, sensitive, introverted version of himself that the main personality would rather keep submerged. By contrast, Rudy himself is brash, crude, lecherous, hedonistic, selfish, and in permanent denial of just how miserable he really is. Consequently, though neither of the pair are truly villainous, it's more common for Rudy 2 to end up getting saddled with the consequences of what the ''main'' persona did rather than vice versa. [[spoiler:And then it turns out that there's a ''third'' alternate personality to the dynamic, a heartless psychopath that both Rudy and Rudy 2 are trying to keep repressed, playing the Jekyll and Hyde dynamic straight.]]

* ''VideoGame/FalloutNewVegas'': In ''Dead Money'', one of your companions is a Nightkin with 2 split personalities who act like [[UsefulNotes/IdSuperegoAndEgo an Id and a Superego without an Ego to unite them]]. Dog, the Hyde, is an animalistic brute who talks in HulkSpeak, eats just about anything or ''anyone'' he can stuff into his gaping maw, and [[ExtremeDoormat instinctively latches onto authority figures who he can serve]] -- hence why he kidnaps people for Father Elijah. God, the apparent Jekyll, is much more intelligent and at least somewhat honorable, but that doesn't stop him from being a cold, cruel, and thoroughly self-interested ControlFreak.

** The Mask sometimes ends up in the hands of villains like [[ArchEnemy Pretorious]] or [[YouthIsWastedOnTheDumb Fish Guy]]. In "[[Recap/TheMaskS1E6ShadowOfASkillit Shadow of a Skillit]]", it was revealed that Skillit enforces this as he hates [[NiceGuy Nice Guys]] who own the Mask and goes out of his way to kill them, preferring them bad. In this episode and "[[Recap/TheMaskS1E13AllHallowsEve All Hallows Eve]]", audience can learn that the Mask was in possession of such ''in''famous personalities like Atilla, Blackbeard, Genghis Khan, Billie the Kid and Merlin (who turned himself into the monster [[SdrawkcabName Nilrem]]).

* ''WesternAnimation/ScoobyDooWhereAreYou'': In "[[Recap/ScoobyDooWherAreYouS2E1NowhereToHyde Nowhere to Hyde]]", the meek scientist Dr. Jekyll tells the gang he was experimenting with a formula that may be transforming him into the Ghost of Mr. Hyde, a jewel thief, while he is unawares. [[spoiler:In truth, Mr. Hyde was just a disguise for Jekyll, who was perfectly aware of his actions. Jekyll even tries to frame the whole thing on his maid.]]
[[/folder]]

** [[Characters/MarvelComicsNormanOsborn Norman Osborn]] is often portrayed as just as despicable as his AxCrazy Green Goblin persona, being a CorruptCorporateExecutive who puts profits over people every time. During the Dark Reign event, he became director of SHIELD, renaming it to HAMMER and creating his own Dark Avengers, all while blaming Tony Stark for the Skrull invasion. Even when he was cured during ''ComicBook/TheAmazingSpiderMan2018'' and genuinely makes an effort to atone, he still teamed up with Wilson Fisk AKA ''The Kingpin'' in an effort to try and take down one of Spidey's rogues.

However, this isn't always the case -- not even in the work that gave us the trope to begin with: in ''Literature/TheStrangeCaseOfDrJekyllAndMrHyde'', Hyde soon became Jekyll's means of secretly indulging himself without feeling guilt or endangering his social standing, as Jekyll enjoyed the criminal adventures that he and his alternate persona got up to... up until Hyde gained a life of his own and spiraled out of Jekyll's control. In the wake of the story's adaptation into theatre and eventually into film, Dr Jekyll was progressively reinterpreted until he was portrayed as purely good and genuinely upstanding, often to the point of altering his motives for conducting the experiment in the first place.

* ''Literature/{{Paprika}}'': In the anime film adaptation, Dr Atsuko Chiba has adopted the persona of "Paprika" in order to secretly treat her patients in their dreams... but given [[RealDreamsAreWeirder the nature of the dreamworld]], Paprika has taken on a life of her own. Far from being dangerous, she's charming, whimsical, and genuinely compassionate, ''and'' she's the personality who actually has the [[DreamWeaver power to influence dreams]]. By contrast, Chiba is a strictly professional IceQueen who never seems to dream for herself, never has fun, and reacts to the emotional foibles of her co-workers with irritation and even rage. For good measure, it's heavily implied that she represses her true emotions, hence why Paprika exists separately from her in the first place. In the finale, this comes to a head when [[spoiler:the only way to achieve victory is for Chiba to acknowledge her true feelings and [[SplitPersonalityMerge merge with her other self]] to become a gigantic infant that devours the BigBad in order to literally mature into a complete person.]]

* ''WesternAnimation/VanHelsingTheLondonAssignment'': The original Dr Jekyll and Mr Hyde feature as the main villains of the story, with both being monstrous in their own way. While Hyde is still the murderous brute he was in the live-action film, Jekyll is a self-deluding stalker who's been more than willing to profit from Hyde's murders in order to advance his own scheme.

* ''Literature/TheStrangeCaseOfDrJekyllAndMrHyde'': Contrary to the common tropes of the story's adaptations, the original Dr Jekyll was secretly quite selfish and hypocritical. Indeed, once he moved beyond the initial experiment phase, Hyde was his entertainment and partner in crime: with Hyde's new appearance and guiltless personality, Jekyll could indulge himself in criminal adventures without putting his good standing or his good nature at risk. It wasn't until Jekyll lost control of Hyde's instincts that the new persona became the destructive, monstrous split personality that everyone's familiar with, leaving Jekyll struggling to rein him.

* ''VideoGame/{{Psychonauts}}:'' Boyd Cooper is ultimately revealed to possess an EnemyWithin just waiting to take him over. [[spoiler:Known as the Milkman, he's a ruthless destroyer created by [[BigBad Coach Oleander]] in order to burn down the Asylum and destroy all evidence of Dr Loboto's activities. Worse still, [[NiceJobBreakingItHero Raz accidentally awakens the Milkman]] during his attempts to get into the Asylum.]] But as nasty as this other personality is, Boyd isn't exactly a nice guy himself: a delusional paranoiac and conspiracy theorist, he will endlessly ramble on about the covert groups he believes to be responsible for ruining his life, oblivious to Raz's growing exasperation. Plus, he was fired from his last job as a department store guard for randomly interrogating shoppers out of sheer paranoia -- and retaliated against his dismissal by ''burning down the store.''

* ''ComicBook/{{Batman}}'': [[DependingOnTheWriter Some interpretations of]] Two-Face depict Harvey Dent, the ostensible good side, as being much more morally ambiguous than his sterling reputation suggests -- though he's generally nowhere near as bad as his SplitPersonality. The most famous example is ''ComicBook/TheLongHalloween'', where [[JerkWithAHeartOfGold Harvey]] is an obsessive and cold misanthrope to start with, to the point where even Gordon and Batman -- his closest friends and allies -- suspect him of murder long before his transformation.

** Norman Osborn is often portrayed as just as despicable as his AxCrazy Green Goblin persona, being a CorruptCorporateExecutive who puts profits over people every time. During the Dark Reign event, he became director of SHIELD, renaming it to HAMMER and creating his own Dark Avengers, all while blaming Tony Stark for the Skrull invasion. Even when he was cured during ''ComicBook/TheAmazingSpiderMan2018'' and genuinely makes an effort to atone, he still teamed up with Wilson Fisk AKA ''The Kingpin'' in an effort to try and take down one of Spidey's rogues.

* ''WesternAnimation/AmericanDad'': In "[[Recap/AmericanDadS5E2TheOneThatGotAway The One That Got Away]]", one of Roger's personas developed into a SplitPersonality in its own right and hired a hitman to kill Roger. However, it turns out that this new identity, Sidney Huffman, is actually a genuinely nice character who only resorted to attempted murder after being pushed to the limits of tolerance by Roger Smith's douchebaggery. By contrast, Roger has always been ComedicSociopathy incarnate, to the point that he created the Sidney Huffman persona because ''he didn't know how to process guilt.''

When it comes to the SplitPersonality - figurative or [[LiteralSplitPersonality literal]] - many depictions operate through the common trope of JekyllAndHyde, in which the secondary persona is some flavour of villain and the original self is a hero, or at the very least virtuous.

However, this isn't always the case - not even in the work that gave us the trope to begin with: in ''Literature/TheStrangeCaseOfDrJekyllAndMrHyde'', Hyde soon became Jekyll's means of secretly indulging himself without feeling guilt or endangering his social standing, as Jekyll enjoyed the criminal adventures that he and his alternate persona got up to... up until Hyde gained a life of his own and spiraled out of Jekyll's control. In the wake of the story's adaptation into theatre and eventually into film, Dr Jekyll was progressively reinterpreted until he was portrayed as purely good and genuinely upstanding, often to the point of altering his motives for conducting the experiment in the first place.

Please note that this trope doesn't concern itself with the adaptation-induced misconception that the relationship between "Jekyll" and "Hyde" are as clear apart as [[BlackAndWhiteMorality back and white]] - not even in cases where the roles of the pair are switched - nor is it about adaptations of the story in general. Rather, this trope explores such instances where the typical morality associated with split personalities begins to blur...

[[folder: Anime & Manga]]

[[folder: Comic Books]]
* ''ComicBook/{{Batman}}'': [[DependingOnTheWriter Some interpretations of]] Two-Face depict Harvey Dent, the ostensible good side, as being much more morally ambiguous than his sterling reputation suggests - though he's generally nowhere near as bad as his SplitPersonality. The most famous example is ''ComicBook/TheLongHalloween'', where [[JerkWithAHeartOfGold Harvey]] is an obsessive and cold misanthrope to start with, to the point where even Gordon and Batman - his closest friends and allies - suspect him of murder long before his transformation.

* ''ComicBook/TheMightyThor'': [[MadScientist Doctor Calvin Zabo]] was a lifelong fan of the story of Doctor Jekyll and Mister Hyde, specifically the idea of being able to become someone else to engage in crime and take revenge on those he felt slighted him without having to worry about being caught. Using his scientific genius, he succeeded in creating a formula that turned him into the hulking brutish supervillain he dubbed [[GeniusBruiser Mister Hyde]]. Whether they are separate personalities or simply the same person in a different form shifts DependingOnTheWriter, but one thing that's remained consistent that they're both equally vicious, sadistic sociopaths - to the point that even in stories where Zabo is prevented from changing into Mister Hyde, he's proven to be more than capable of enacting depravity and mass murder on his own.

[[folder: Fan Works]]

[[folder: Film - Animated]]

[[folder: Film - Live-Action]]

* ''Film/TheCell'': Once Catherine [[JourneyToTheCenterOfTheMind starts delving into Carl Rudolph Stargher's unconscious mind]], she finds that he's dominated by his schizophrenic Id, manifested as "a king of a twisted kingdom." As such, she tries to seek out the other aspects of his personality for information on Stargher's surviving captive, but though his inner child is nice enough, he can't help much... and when Catherine finally discovers Stargher's more rational adult self, it turns out that this persona is just as involved with the serial killing as the dominating Id. Not only does he refuse to help, but [[PokeInTheThirdEye he quickly sicks Stargher King on her]]. The nearest thing to a sane thought he has is in the finale, [[spoiler: when he suggests that Catherine should MercyKill him, believing that he was doing the same thing for his victims.]]

[[folder: Literature]]
* ''Literature/ThePiloFamilyCircus'': Main character Jamie is a bitter, superficial, cowardly, and generally self-absorbed dickhead who slips an unknown substance into a housemate's milk as petty revenge for hogging the shower. After being press-ganged into the [[CircusOfFear Circus]] and forced to wear [[MonsterClown the Clown Division]]'s facepaint, he develops the alternate personality of "JJ," a PsychopathicManchild with all Jamie's worst traits turned up to eleven. In response to JJ's increasingly violent antics, Jamie regularly uses the Powder to [[AddledAddict sedate himself]] so he won't have to deal with the consequences of his other self's actions, even though he knows that his time in the Circus can only end with [[SplitPersonalityTakeover JJ taking over for good]]. [[spoiler: It's not until after Winston the Clown recruits him for [[LaResistance the Freedom Movement]] that Jamie gets off his ass and tries to be a better person in the face of JJ's atrocities.]]

[[folder: Live Action TV]]
* ''Series/AvataroSentaiDonbrothers'': PlayedWith for Jiro. Jiro's SplitPersonality [[spoiler: is actually the social one everyone knows by default. The real Jiro is the one everyone else ''thinks'' is an alter.]] The Dangerous side is ''just'' a HeroicWannabe that runs on ThePowerOfHate whose primary goal is to [[TheStarscream supplant Taro as team leader]] in its pursuit of heroism and is willing to attack its allies to do so. The default self meanwhile is an InnocentlyInsensitive GlorySeeker that occasionally nudges in the direction of a LackOfEmpathy; almost always succumbing to narcissism whenever he's put in a position close to "hero". Dangerous is ironically TheEmpath despite its anger issues and somewhat mellows out over time. The other side meanwhile is rather superficial and [[HelplessGoodSide barely knows any better]], which only wigs the others out. Dangerous is a nuisance deliberately, the other Jiro is a nuisance inadvertently.

* ''Series/MoonKnight'': {{Downplayed|Trope}} and [[ZigZaggingTrope ZigZagged]]. [[spoiler: While abrasive mercenary/superhero Marc is initially framed as the alter to gentle AudienceSurrogate Steven, who indulges in violent, dangerous situations while Steven sleeps, it turns out ''Marc'' is the original personality while Steven is the alter. However, Marc is also gradually shown to be more of an AntiHero with a DarkAndTroubledPast, so by the time Steven discovers Marc is the original personality, he doesn't find Marc odious at all, and in fact helps him face his trauma. And then there's that [[AlternateIdentityAmnesia secret]] [[AmbiguouslyEvil third personality]]...]]
* ''Series/{{Misfits}}:'' Season 3 introduces Rudy, who has the Storm-imbued ability to manifest another persona as a LiteralSplitPersonality. Though Rudy treats his other self like a disruptive menace, it's clear that Rudy 2 is actually the nicer, sensitive, introverted version of himself that the main personality would rather keep submerged. By contrast, Rudy himself is brash, crude, lecherous, hedonistic, selfish, and in permanent denial of just how miserable he really is. Consequently, though neither of the pair are truly villainous, it's more common for Rudy 2 to end up getting saddled with the consequences of what the ''main'' persona did rather than vice versa. [[spoiler: And then it turns out that there's a ''third'' alternate personality to the dynamic, a heartless psychopath that both Rudy and Rudy 2 are trying to keep repressed, playing the Jekyll and Hyde dynamic straight.]]
* ''Series/OnceUponATime'': When the show's version of the classic Jekyll and Hyde are introduced at the end of season 5, it seems they're the standard "Jekyll = good; Hyde = bad" pair. However, season 6 reveals [[spoiler: that ''Jekyll'' is the real villain -- "all mind, but no heart", as Hyde says at one point -- and driven to rage and murder, the latter of which he frames Hyde for. Hyde, in contrast, is villainous in that he's willing to allow innocents to die for his vengeance, but also displays actual emotions -- mainly, he's still mourning the woman he fell in love with and who loved him back until Jekyll killed her because she'd rejected ''him'' in favor of his Hyde personality]].

[[folder: Tabletop Games]]

[[folder: Video Games]]
* ''VideoGame/DarkSeedII'': [[spoiler: The finale reveals that Jack is the SerialKiller terrorizing the town, but despite Mike's insistence that he must also be the Shapeshifter, Jack claims to be a SplitPersonality of Mike himself. If this is true, Mike doesn't exactly qualify as the "good" personality, being whiny, self-pitying, impulsive, and astonishingly childish, not to mention prone to extremely questionable decisions over the course of the game - including punching out an FBI agent and killing Paul Cooper.]]
* ''VideoGame/FalloutNewVegas'': In ''Dead Money'', one of your companions is a Nightkin with 2 split personalities who act like [[UsefulNotes/IdSuperegoAndEgo an Id and a Superego without an Ego to unite them]]. Dog, the Hyde, is an animalistic brute who talks in HulkSpeak, eats just about anything or ''anyone'' he can stuff into his gaping maw, and [[ExtremeDoormat instinctively latches onto authority figures who he can serve]] - hence why he kidnaps people for Father Elijah. God, the apparent Jekyll, is much more intelligent and at least somewhat honorable, but that doesn't stop him from being a cold, cruel, and thoroughly self-interested ControlFreak.
* ''VideoGame/{{Psychonauts}}:'' Boyd Cooper is ultimately revealed to possess an EnemyWithin just waiting to take him over. [[spoiler: Known as the Milkman, he's a ruthless destroyer created by [[BigBad Coach Oleander]] in order to burn down the Asylum and destroy all evidence of Dr Loboto's activities. Worse still, [[NiceJobBreakingItHero Raz accidentally awakens the Milkman]] during his attempts to get into the Asylum.]] But as nasty as this other personality is, Boyd isn't exactly a nice guy himself: a delusional paranoiac and conspiracy theorist, he will endlessly ramble on about the covert groups he believes to be responsible for ruining his life, oblivious to Raz's growing exasperation. Plus, he was fired from his last job as a department store guard for randomly interrogating shoppers out of sheer paranoia - and retaliated against his dismissal by ''burning down the store.''

* ''VideoGame/TheSecretWorld'': The supernatural assassin known as the White Rabbit is eventually revealed to have been born with multiple personalities as a result of absorbing her twin sisters in the womb. None of the three could be described as good, given that all of them demonstrated violence and a tendency to escape from the asylum on hunts for magical creatures. [[spoiler: Ultimately, [[HumanoidAbomination Lilith]] found the unfortunate young woman and gave her other personalities bodies of their own... and eventually, they became an entire team of White Rabbit assassins posing as one.]] No matter which White Rabbit you're dealing with in the present, the Mask of Kan'ami diagnoses her as a heartless sociopath.
* ''VideoGame/TheSuffering: Ties That Bind'': [[spoiler: The ultimate twist of the game is that the crime lord [[BigBad Blackmore]] is actually an alter of Torque. However, while Blackmore is a ruthless, scheming psychopath who [[SplitPersonalityTakeover wants to seize control of Torque full-time]], Torque isn't exactly a saint either: not only does he have such UnstoppableRage that he's committed manslaughter in the past, but he willingly participated in organized crime while in Blackmore's employ, before [[MoralityPet Carmen]] talked him into quitting. Depending on player choice, Torque can also prove himself to be a remorseless sadistic killer who abused and slaughtered his family - to the point that in the bad ending, [[TheBadGuyWins Blackmore can take over his mind]] simply because Torque has become too much like him to resist.]]
* ''VideoGame/VampireTheMasqueradeBloodlines:'' Towards the end of the player's time in Santa Monica, it's revealed that [[spoiler: Therese and Jeanette Voermann are actually the same person, courtesy of Malkavian insanity. Though the alter Jeanette initially seems the less trustworthy and ''can'' do some pretty villainous things if the player sides against her - condemning the Ocean House Ghosts to [[AndIMustScream haunt the hotel for eternity]], for example - the original personality Therese is much more openly unpleasant: not only is she [[IceQueen cold]], [[HolierThanThou sanctimonious]], [[PoliticallyIncorrectVillain bigoted]], and [[AmbitionIsEvil utterly ruthless in her pursuit of power]], but she has no qualms about using the local blood bank as her personal larder and allowing her ghoul to restock it through [[HumanResources some creatively brutal methods]].]]

[[folder: Western Animation]]

** In "[[Recap/TheMaskS1E15SplitPersonality Split Personality]]", we meet Chet Bozak, Stanley's high school bully, who tormented him relentlessly and ended up getting expelled after nailing a bunch of wood to Stanley's head and passing him off as a doorstop for shop class. When Chet returns as an adult, he gets his hands on one half of the Mask, allowing him to transform half his body into his own Mask persona - who is even worse than him, and actually tries to kill Stanley with a circular saw. [[EvenEvilHasStandards Even Chet thinks this is going too far]] and ends up in a physical struggle with his own alter ego.
** In "[[Recap/TheMaskS2E30CounterfeitMask Counterfeit Mask]]", Peggy Brandt ends up wearing the Mask instead of Stanley, gaining her own vain and selfish Mask persona who will happily threaten beauticians with a hammer for not doing a thorough job. However, Peggy isn't normally a straightforward "nice" character, having been taken from film continuity - in which she sold Stanley out to Dorian Tyrell, and though she's repented of this and even demonstrated true friendship to Stanley since then, Peggy's still trying to exploit the Mask for the scoop that will make her career. She's also hard-nosed, impatient, and more than a little domineering, especially compared to Stanley... and as serious as Peggy is, [[NotSoAboveItAll she isn't above being immature when she can get away with it]], as she demonstrates when the Mask's youth serum allows her to be a teenager again in "[[Recap/TheMaskS3E2LittleBigMask Little Big Mask]]".
* ''WesternAnimation/ScoobyDooWhereAreYou'': In "[[Recap/ScoobyDooWherAreYouS2E1NowhereToHyde Nowhere to Hyde]]", the meek scientist Dr. Jekyll tells the gang he was experimenting with a formula that may be transforming him into the Ghost of Mr. Hyde, a jewel thief, while he is unawares. [[spoiler: In truth, Mr. Hyde was just a disguise for Jekyll, who was perfectly aware of his actions. Jekyll even tries to frame the whole thing on his maid.]]

* ''Literature/{{Paprika}}'': In the anime film adaptation, Dr Atsuko Chiba has adopted the persona of "Paprika" in order to secretly treat her patients in their dreams... but given [[RealDreamsAreWeirder the nature of the dreamworld]], Paprika has taken on a life of her own. Far from being dangerous, she's charming, whimsical, and genuinely compassionate, ''and'' she's the personality who actually has the [[DreamWeaver power to influence dreams]]. By contrast, Chiba is a strictly professional IceQueen who never seems to dream for herself, never has fun, and reacts to the emotional foibles of her co-workers with irritation and even rage. For good measure, it's heavily implied that she represses her true emotions, hence why Paprika exists seperately from her in the first place. In the finale, this comes to a head when [[spoiler:the only way to achieve victory is for Chiba to acknowledge her true feelings and [[SplitPersonalityMerge merge with her other self]] to become a gigantic infant that devours the BigBad in order to literally mature into a complete person.]]