History Main / SplitPersonality

19th Jan '17 5:18:37 AM Morgenthaler
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* ''TabletopGame/CallOfCthulhu'' supplement ''The Asylum and Other Tales'', adventure "The Madman". An investigator is driven insane by exposure to the CthulhuMythos and develops an evil alternate personality.

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* ''TabletopGame/CallOfCthulhu'' supplement ''The Asylum and Other Tales'', adventure "The Madman". An investigator is driven insane by exposure to the CthulhuMythos Franchise/CthulhuMythos and develops an evil alternate personality.
29th Dec '16 10:42:21 PM CLT009
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** Not only does she have two voice actresses who each take a personality, ''[[UpToEleven they also swap the rational/irrational role depending on the scene]]!''
21st Dec '16 12:31:38 PM CherryLotus
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* In ''VideoGame/MugenSouls'', the main plot revolves around Chou Chou recruiting new peons, continents, and even planets as her allies with her different split personalities.
20th Dec '16 8:15:07 AM Mikura39
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*** Additionally, [[spoiler:Marie Parfacy]] has one [[spoiler:named Soma Pieres. Soma]] "goes to sleep" indefinitely in the second season and [[spoiler:Marie returns to be]] the one in control.

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*** Additionally, [[spoiler:Marie Parfacy]] has one [[spoiler:named Soma Pieres.Peries. Soma]] "goes to sleep" indefinitely in the second season and [[spoiler:Marie returns to be]] the one in control.
8th Dec '16 3:35:57 AM tiredseth
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* ''VisualNovel/{{UtaNoPrincesama}}'' Maji Love 1000%:
** Natsuki is typically oblivious and, to an extent, airheaded. Despite his positive outlook on life, he gets discouraged quite easily. "Satsuki", his alter ego per say, comes out when Natsukiís glasses are removed. Satsuki is harsh and combative, rumored to have put 50,000 people in the hospital for angering him.
6th Dec '16 10:45:49 PM billybobfred
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* ''Webcomic/{{Homestuck}}'': [[spoiler:Calliope and Caliborn]]. She is probably the sweetest, kindest, most innocent character in the entire comic, and she uses the most passive class possible in the game. He, on the other hand, is evil, has the most active class possible in the game, loves to pretend he's [[Franchise/{{Saw}} Jigsaw]], is possibly the original incarnation of the BiggerBad, [[ArsonMurderAndJaywalking and is turned on by his disgust for tender, non-sexual displays of affection.]]
** This is ''normal'' for juveniles of his/her/their species. At what amounts to puberty, one of the personalities "kills" the other one and takes over the body permanently. At least in this specific case, the two personalities have been aware of each other since early childhood and communicate through notes. They're ... not fond of each other.

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* ''Webcomic/{{Homestuck}}'': [[spoiler:Calliope and Caliborn]]. She is probably the sweetest, kindest, most innocent character in the entire comic, and she uses the most passive class possible in the game. He, on the other hand, is evil, has the most active class possible in the game, loves to pretend he's [[Franchise/{{Saw}} Jigsaw]], is possibly the original incarnation of the BiggerBad, [[ArsonMurderAndJaywalking and is turned on by his disgust for tender, non-sexual displays of affection.]]
** This is ''normal'' for juveniles of his/her/their their species. At what amounts to puberty, one of the personalities "kills" the other one and takes over the body permanently. At least in this specific case, the two personalities have been aware of each other since early childhood and communicate through notes. They're ... not fond of each other. What's not normal, even by their species's standards, [[spoiler:is using SBURB's DreamLand mechanics to kill the other personality way ahead of schedule.]]
28th Nov '16 2:19:48 PM Morgenthaler
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* In ''VideoGame/FinalFantasyVII'', the protagonist Cloud suffers from a case of split personality, where [[spoiler:thanks to Mako/Jenova experiments at the hands of Hojo, the Jenova cells injected inside him take over his brain and create a new persona based on Cloud's desires about being a BadAss SOLDIER operative like his idol Sephiroth and his friend Zack. The real Cloud is reduced to a mere voice in his head.]]

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* In ''VideoGame/FinalFantasyVII'', the protagonist Cloud suffers from a case of split personality, where [[spoiler:thanks to Mako/Jenova experiments at the hands of Hojo, the Jenova cells injected inside him take over his brain and create a new persona based on Cloud's desires about being a BadAss badass SOLDIER operative like his idol Sephiroth and his friend Zack. The real Cloud is reduced to a mere voice in his head.]]
16th Nov '16 6:39:28 PM HKiyama
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* In the ''Series/NightVisions'' episode "Switch", the protagonist, Sydney, has multiple personalities.
* ''{{Series/Dollhouse}}'' has two: [[spoiler:Alpha and Echo. However, Echo only gets it the last two episodes, and they're both a literal case of many personalities.]]
* Niki Sanders on ''Series/{{Heroes}}'' has "Jessica", the personality of her dead sister, as an amoral alter ego with super-strength. Some people just can't handle having superpowers and the stress causes a dissociative break, making this one a quite literal SuperpoweredEvilSide.
** When "Jessica" kills their father in early S1, it's made clear that he was abusive to the point of killing Nikki's sister Jessica, after whom the alter ego is named. Only the "Jessica" alter remembers, which resembles real theories of DID fairly well. In S2, a third, party girl personality, who apparently began as a mere alias, emerges.
* A patient in ''Series/PrivatePractice'' was alleged to have this condition; she was diagnosed at the age of seven and partially raised by her older sister, and she hasn't had a resurgence in ten years. Unfortunately, they came back with the stress of her sister moving away. [[spoiler:She was actually faking so that they won't move.]]
* While this is a staple trope of daytime soap operas, the soap ''Series/OneLifeToLive'' took this to an extreme. Not only did established character Victoria Lord Buchanan develop a number of personalities (the most notorious of which was streetwalker Niki Smith, a full contrast to Viki's upper-crust manner), her daughter Jessica later developed her own split (tough girl Tess), as a result of a retcon where a young Jessica follows Niki to a bar and gets raped by a guy and this was caught on tape. Apparently, in the OLTL universe, split personality is a genetic disorder. In addition, Viki's brother, Todd Manning, at one point was also thought to suffer from DID, with 5 separate personalities: the original Todd, Tommy, a little boy who was the abused Todd as a small child, Rodd, an Italian-accented charmer, and Peter, a representation of Todd's abusive step-father, and a strict female personality that served as the Gatekeeper. At the end of the storyline, Todd admitted he'd been faking all of the personalities, but as he [[PutOnABus left town]] (the actor was leaving the show), a last scene showed Todd and all of his personalities on the plane.
* ''Series/UnitedStatesOfTara'': One character has four alternate personalities: a sex-and-drugs addict 15-year-old called T; a disturbing StepfordSmiler housewife named Alice; and a male, rowdy, alcohol- and brawls-loving motorist called Buck; along with [[spoiler:the mysterious Gimme, who was unknown ''even to Tara'' and serves as a kind of "pure id/protector" alter, who comes out whenever Tara gets too close to discovering something which might traumatise her.]]\\
\\
Seasons Two and Three introduce three more personalities: Shoshana Schoenbaum, an alter based on a therapist Tara creates after reading said therapist's book, Chicken, who is essentially Tara when she was five years old, and [[spoiler:Bryce Crane, an alter based on Tara's half-brother who is believed to have sexually molested Tara when she was a child and is the reason why she has DID in the first place. Bryce then proceeds to apparently kill all of the other alters, although the last episode reveals that Buck, T, and Alice are still 'alive'.]]
* In the third season of ''Series/HomicideLifeOnTheStreet'', a serial killer turns out to have multiple personalities, including [[spoiler:a seven-year-old girl. One detective tricks this personality into burning herself, so another personality sues the precinct. However, it is implied that this may all be a ruse on the killer's part.]]
* Shawn and Gus run into a character with three personalities on ''Series/{{Psych}}''. [[spoiler:Two are male, one is a female, and one is the killer, who is (understandably) a little ticked off that the female personality is scheming to get a sex change.]] When Gus points out how rare the condition is, it is hand-waved by Shawn pointing out it only has to happen once to be true.
* On the British soap opera ''Series/{{HollyOaks}}'', troubled emo kid Newt has an alternate personality called "Eli", who trashes the Deans' house and encourages him to run away from his foster home. In recent episodes, he now plans to find and kill the real Eli (a friend from his days in the social care system) in the hope of banishing the "Eli" personality.



* 1960's ''Series/{{Batman}}'' series. Professor William Omaha [=McElroy=], an Egyptologist at Yale University, would become the villain King Tut every time he was hit on the head and return to normal when he was hit on the head again. He would be the only series villain never sent to jail, via the insanity defense.
** Prof. Mc Elroy also knew about his Tut self (despite not recalling ''what'' he did under it) and also tried to ''prevent'' King Tut's emergence via wearing a special hat supposed to soften blows to the head. Obviously, it didn't work.



* ''Series/NipTuck'': one of the episodes is Montana/Sassy/Justice. One wants her ankles fixed and another one wants her breasts gone because she is 5. This is the same person.
* ''Series/LawAndOrderSpecialVictimsUnit'' has had a multiple personality woman (Cynthia Nixon) killing her abusive dad. [[spoiler:She gets a "not guilty" verdict by reason of insanity, but she was faking it. The detectives realize it too late, and settle for arresting her sister, who was also involved.]]
* In ''Series/TheFollowing'', after recurring villain Luke Gray is killed, his twin brother/killing partner Mark recreates him as an alternate personality which he slips into to deal with stressful situations, as Luke had done for him in life.
* ''Series/MyOwnWorstEnemy'' has this as the premise of the show. Edward Albright, a spy, is the original personality, and Henry Spivey, a quiet middle-management office employee with a wife and two kids, is the implanted cover. The chip that separates the two lives breaks down, and Henry becomes aware of his alter-ego.
* In ''Series/TerminatorTheSarahConnorChronicles'' episode "Allison from Palmdale," [[RobotGirl Cameron]] suffers a glitch due to combat damage she took earlier in the series. As a result, she takes on a completely different identity and personality, that of a girl named Allison Young, a future resistance fighter whom her body was modeled after [[spoiler:and then subsequently killed.]] By the end of the episode, she recovers, though not without [[NightmareFuel supplying the stuff of many an unpleasant dream]] in the process.
* In one episode of ''Series/StargateSG1'', Carter likens being host to a Tok'ra symbiote to having schizophrenia. They meant DID. Apparently, they later did their research, and as though to pay penance for their error, made an episode where Daniel Jackson actually got schizophrenia from an AppliedPhlebotinum that was intended to kill Goa'uld.
** Since DID patients generally aren't aware of their other personalities, but some schizophrenia manifests as ''hearing voices in your head'', maybe they ''did'' mean schizophrenia. The Tok'ra host and symbiote are conscious at the same time regardless of who is controlling the body, and communicate with each other mentally.
* In ''Series/CuteyHoneyTheLive'', Panther Claw member Yuji Nakajo has three split personalities: the original, a calm and reserved young man; Hikomaro, a gleefully sadistic child; and Giza, a viscous BloodKnight. [[spoiler:Later in the series, they are overtaken by a fourth personality: Hikaru, a non-combative yet ManipulativeBitch.]]

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* ''Series/NipTuck'': one of In the episodes is Montana/Sassy/Justice. One wants her ankles fixed and another one wants her breasts gone because she is 5. This is the same person.
* ''Series/LawAndOrderSpecialVictimsUnit'' has had
''Series/{{Columbo}}'' episode ''Fade in to Murder,'' actor Ward Fowler (played by Creator/WilliamShatner) begins to demonstrate increasing signs of having a multiple split personality woman (Cynthia Nixon) killing her abusive dad. [[spoiler:She gets a "not guilty" verdict by reason of insanity, but she was faking it. The detectives realize it too late, and settle for arresting her sister, who was also involved.]]
* In ''Series/TheFollowing'', after recurring villain Luke Gray is killed, his twin brother/killing partner Mark recreates him as an alternate personality which he slips into to deal
with stressful situations, as Luke had done for him in life.
* ''Series/MyOwnWorstEnemy'' has this as
Detective Lucerne, the premise of character he plays on the fictional TV show. Edward Albright, a spy, is While Fowler seeks to evade Columbo's investigation, Detective Lucerne actively aids the original personality, and Henry Spivey, a quiet middle-management office employee with a wife and two kids, is the implanted cover. The chip that separates the two lives breaks down, and Henry becomes aware of lieutenant in tracking down his alter-ego.
* In ''Series/TerminatorTheSarahConnorChronicles'' episode "Allison from Palmdale," [[RobotGirl Cameron]] suffers a glitch due to combat damage she took earlier in the series. As a result, she takes on a completely different identity and personality, that of a girl named Allison Young, a future resistance fighter whom her body was modeled after [[spoiler:and then subsequently killed.]] By the end of the episode, she recovers, though not without [[NightmareFuel supplying the stuff of many an unpleasant dream]] in the process.
* In one episode of ''Series/StargateSG1'', Carter likens being host to a Tok'ra symbiote to having schizophrenia. They meant DID. Apparently, they later did their research, and as though to pay penance for their error, made an episode where Daniel Jackson actually got schizophrenia from an AppliedPhlebotinum that was intended to kill Goa'uld.
** Since DID patients generally aren't aware of their
other personalities, but some schizophrenia manifests as ''hearing voices in your head'', maybe they ''did'' mean schizophrenia. The Tok'ra host and symbiote are conscious at the same time regardless of who is controlling the body, and communicate with each other mentally.
* In ''Series/CuteyHoneyTheLive'', Panther Claw member Yuji Nakajo has three split personalities: the original, a calm and reserved young man; Hikomaro, a gleefully sadistic child; and Giza, a viscous BloodKnight. [[spoiler:Later in the series, they are overtaken by a fourth personality: Hikaru, a non-combative yet ManipulativeBitch.]]
self.



* The ''Series/DoctorWho'' audio Omega has a sort-of case of this: [[spoiler:Omega, half of whose personality is under the delusion that he's the Doctor and that Omega isn't inhabiting the same body as he is.]] However, it's clearly not DID and has rather more sci-fi causes.



* An episode of ''Series/LieToMe'' has Cal take a client with this disorder. Cal has to figure out which of her several personalities witnessed a murder. Although the character is initially referred to as having a split personality, Foster corrects the speaker and instead says that she has DID, which is the term used for the rest of the episode. Foster also [[LampshadeHanging notes that DID is very rare, assuming it exists at all.]]
-->'''Foster:''' It's Dissociative Identity Disorder, and it's more plausible than a psychic vision, but just barely.

to:

* An episode of ''Series/LieToMe'' In ''Series/CuteyHoneyTheLive'', Panther Claw member Yuji Nakajo has Cal take a client with this disorder. Cal has to figure out which of her several personalities witnessed a murder. Although the character is initially referred to as having a three split personality, Foster corrects personalities: the speaker original, a calm and instead says that she has DID, which is reserved young man; Hikomaro, a gleefully sadistic child; and Giza, a viscous BloodKnight. [[spoiler:Later in the term used for the rest of the episode. Foster also [[LampshadeHanging notes that DID is very rare, assuming it exists at all.series, they are overtaken by a fourth personality: Hikaru, a non-combative yet ManipulativeBitch.]]
-->'''Foster:''' It's Dissociative Identity Disorder, * The main hook of ''Do No Harm'': The title character is an ethical doctor who switches to a malevolent second personality at 8:25 pm each night and then reverts back at 8:25 am the following morning. After keeping this personality sedated with drugs for years, one day he finds that his body has become immune to them... unleashing the other personalty, now bent on destroying his life. [[spoiler:[[SubvertedTrope Subverted]] in the series finale when it was [[TheReveal revealed]] that the benevolent personality was the alternate personality while the malevolent one was the original]].
* The ''Series/DoctorWho'' audio Omega has a sort-of case of this: [[spoiler:Omega, half of whose personality is under the delusion that he's the Doctor and that Omega isn't inhabiting the same body as he is.]] However,
it's clearly not DID and has rather more plausible than sci-fi causes.
* ''{{Series/Dollhouse}}'' has two: [[spoiler:Alpha and Echo. However, Echo only gets it the last two episodes, and they're both
a psychic vision, but just barely.literal case of many personalities.]]
* In ''Series/TheFollowing'', after recurring villain Luke Gray is killed, his twin brother/killing partner Mark recreates him as an alternate personality which he slips into to deal with stressful situations, as Luke had done for him in life.



* 1960's ''Series/{{Batman}}'' series. Professor William Omaha [=McElroy=], an Egyptologist at Yale University, would become the villain King Tut every time he was hit on the head and return to normal when he was hit on the head again. He would be the only series villain never sent to jail, via the insanity defense.
** Prof. Mc Elroy also knew about his Tut self (despite not recalling ''what'' he did under it) and also tried to ''prevent'' King Tut's emergence via wearing a special hat supposed to soften blows to the head. Obviously, it didn't work.
* This is the premise for the Russian comedy series ''Zaitsev+1''. The protagonist, Sasha Zaitsev (sometimes Latinicized as Zaicev) is a typical college nerd who is in love with Nastya, the prettiest girl in his class, although she doesn't know it and stays with her cheating JerkJock boyfriend. Whenever Zaitsev gets hit in the head, is blinded by a bright light, or is deafened by a loud noise, he turns into Fyodor, his wild, rude, and cynical alter ego who likes big women. While Fyodor is actually played by a different actor, only the audience perceives him as a different person. Everyone else just notices that Zaitsev is suddenly acting very differently. Fyodor likes to sleep around, especially with [[NamesTheSame another girl named Nastya]], which becomes a problem for Zaitsev, who can't really explain his problem to others without sounding insane.
* The Season Nine finale of ''Series/LawAndOrderCriminalIntent'', "Three In One", has a character who legitimately has three personalities as opposed to faking. The following spoiler will tell you whether any of them did anything illegal. [[spoiler:Yes. He ended up that way because of severe childhood abuse, which his female abuser told him was "discipline". When he grew up, hearing any adult woman talk about the importance of disciplining a child made him remember his own "discipline", which made him angry and afraid and brought the "protector" personality to the surface. The protector would then attack and kill the woman, whom he believed was advocating and participating in the abuse of children.]]
* ''Series/{{Highlander}}'' had an immortal with a split personality. The good side, Michael Moore (no, not THAT one), was a good friend of Duncan's. But the evil side, Quentin Barnes, slowly overpowered Moore and Duncan had to keep his promise to stop Barnes. In an earlier time, the evil side actually killed the good side's girlfriend.
* ''Series/MurdochMysteries'' features a suspect in a murder that suffers from this in the episode "Me, Myself, and Murdoch".
* Played for laughs in an episode of ''Series/NightCourt'', where a defendant's DID wasn't revealed to the main characters until near the end. One personality was prudish, the other was slutty. The episode's running gag was for her more "open" side luring [[HandsomeLech Dan]] into some private (and always off-camera) location for some hanky-panky, only for her prudish side to re-emerge just as things were apparently getting good.
* Jacqueline Hyde of ''Series/WhereInTimeIsCarmenSandiego'' has two personalities, TheIngenue and OmnicidalManiac, which she repeatedly switches back and forth between. Her "evil" side speaks in VoiceOfTheLegion.



* ''Series/{{Sanctuary}}'' has Adam Worth, a genius with a split personality. It's a bit confusing, since both are, apparently, named Adam. The split started after [[spoiler:his daughter got sick and died]]. He blames the Five for this.
* The main hook of ''Series/DoNoHarm'': The title character is an ethical doctor who switches to a malevolent second personality at 8:25 pm each night and then reverts back at 8:25 am the following morning. After keeping this personality sedated with drugs for years, one day he finds that his body has become immune to them... unleashing the other personalty, now bent on destroying his life. [[spoiler:[[SubvertedTrope Subverted]] in the series finale when it was [[TheReveal revealed]] that the benevolent personality was the alternate personality while the malevolent one was the original]].



* An early episode of ''Series/StarTrekTheOriginalSeries'' pushes the JekyllAndHyde trope to extremes when Captain Kirk is divided into his good and evil halves. And again like ''The Dark Crystal'', Kirk's good half is weak and indecisive while the evil Kirk has his way with pretty much everyone (including, very nearly, Yeoman Rand). He gets better.
* ''Series/NCISNewOrleans'': The killer in [[spoiler:Episode six]] is revealed to be one of these, [[spoiler:born to shield his original from their abusive father. He framed the father for a crime he didn't commit in order to get him locked up; when the father was released, the [[JekyllAndHyde Hyde]] personality started killing again to frame their father a second time and get him sent back to jail permanently.]]
* In the ''Series/{{Columbo}}'' episode ''Fade in to Murder,'' actor Ward Fowler (played by Creator/WilliamShatner) begins to demonstrate increasing signs of having a split personality with Detective Lucerne, the character he plays on the fictional TV show. While Fowler seeks to evade Columbo's investigation, Detective Lucerne actively aids the lieutenant in tracking down his other self.

to:

* An early episode of ''Series/StarTrekTheOriginalSeries'' pushes Niki Sanders on ''Series/{{Heroes}}'' has "Jessica", the JekyllAndHyde trope to extremes when Captain Kirk is divided into his good and evil halves. And again like ''The Dark Crystal'', Kirk's good half is weak and indecisive while the evil Kirk has his way with pretty much everyone (including, very nearly, Yeoman Rand). He gets better.
* ''Series/NCISNewOrleans'': The killer in [[spoiler:Episode six]] is revealed to be one of these, [[spoiler:born to shield his original from their abusive father. He framed the father for a crime he didn't commit in order to get him locked up; when the father was released, the [[JekyllAndHyde Hyde]]
personality started killing again to frame of her dead sister, as an amoral alter ego with super-strength. Some people just can't handle having superpowers and the stress causes a dissociative break, making this one a quite literal SuperpoweredEvilSide.
** When "Jessica" kills
their father a second time and get him sent back in early S1, it's made clear that he was abusive to jail permanently.]]
* In
the ''Series/{{Columbo}}'' episode ''Fade in to Murder,'' actor Ward Fowler (played by Creator/WilliamShatner) begins to demonstrate increasing signs point of having killing Nikki's sister Jessica, after whom the alter ego is named. Only the "Jessica" alter remembers, which resembles real theories of DID fairly well. In S2, a third, party girl personality, who apparently began as a mere alias, emerges.
* ''Series/{{Highlander}}'' had an immortal with
a split personality with Detective Lucerne, personality. The good side, Michael Moore (no, not THAT one), was a good friend of Duncan's. But the character he plays on evil side, Quentin Barnes, slowly overpowered Moore and Duncan had to keep his promise to stop Barnes. In an earlier time, the fictional TV show. While Fowler seeks to evade Columbo's investigation, Detective Lucerne actively aids evil side actually killed the lieutenant in tracking down his other self. good side's girlfriend.



* On the British soap opera ''Series/{{Hollyoaks}}'', troubled emo kid Newt has an alternate personality called "Eli", who trashes the Deans' house and encourages him to run away from his foster home. In recent episodes, he now plans to find and kill the real Eli (a friend from his days in the social care system) in the hope of banishing the "Eli" personality.
* In the third season of ''Series/HomicideLifeOnTheStreet'', a serial killer turns out to have multiple personalities, including [[spoiler:a seven-year-old girl. One detective tricks this personality into burning herself, so another personality sues the precinct. However, it is implied that this may all be a ruse on the killer's part.]]



* By the end of season 4 of ''Series/MelrosePlace'', Kimberly had several personalities.

to:

* The Season Nine finale of ''Series/LawAndOrderCriminalIntent'', "Three In One", has a character who legitimately has three personalities as opposed to faking. The following spoiler will tell you whether any of them did anything illegal. [[spoiler:Yes. He ended up that way because of severe childhood abuse, which his female abuser told him was "discipline". When he grew up, hearing any adult woman talk about the importance of disciplining a child made him remember his own "discipline", which made him angry and afraid and brought the "protector" personality to the surface. The protector would then attack and kill the woman, whom he believed was advocating and participating in the abuse of children.]]
* ''Series/LawAndOrderSpecialVictimsUnit'' has had a multiple personality woman (Cynthia Nixon) killing her abusive dad. [[spoiler:She gets a "not guilty" verdict by reason of insanity, but she was faking it. The detectives realize it too late, and settle for arresting her sister, who was also involved.]]
* An episode of ''Series/LieToMe'' has Cal take a client with this disorder. Cal has to figure out which of her several personalities witnessed a murder. Although the character is initially referred to as having a split personality, Foster corrects the speaker and instead says that she has DID, which is the term used for the rest of the episode. Foster also [[LampshadeHanging notes that DID is very rare, assuming it exists at all.]]
-->'''Foster:''' It's Dissociative Identity Disorder, and it's more plausible than a psychic vision, but just barely.
* By the end of season 4 of ''Series/MelrosePlace'', Kimberly had several personalities. %% Would be useful to add examples here, please and thank you.


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* ''Series/MurdochMysteries'' features a suspect in a murder that suffers from this in the episode "Me, Myself, and Murdoch".
* ''Series/MyOwnWorstEnemy'' has this as the premise of the show. Edward Albright, a spy, is the original personality, and Henry Spivey, a quiet middle-management office employee with a wife and two kids, is the implanted cover. The chip that separates the two lives breaks down, and Henry becomes aware of his alter-ego.
* ''Series/NCISNewOrleans'': The killer in [[spoiler:Episode six]] is revealed to be one of these, [[spoiler:born to shield his original from their abusive father. He framed the father for a crime he didn't commit in order to get him locked up; when the father was released, the [[JekyllAndHyde Hyde]] personality started killing again to frame their father a second time and get him sent back to jail permanently.]]
* Played for laughs in an episode of ''Series/NightCourt'', where a defendant's DID wasn't revealed to the main characters until near the end. One personality was prudish, the other was slutty. The episode's running gag was for her more "open" side luring [[HandsomeLech Dan]] into some private (and always off-camera) location for some hanky-panky, only for her prudish side to re-emerge just as things were apparently getting good.
* In the ''Series/NightVisions'' episode "Switch", the protagonist, Sydney, has multiple personalities.
* ''Series/NipTuck'': one of the episodes is Montana/Sassy/Justice. One wants her ankles fixed and another one wants her breasts gone because she is 5. This is the same person.
* While this is a staple trope of daytime soap operas, the soap ''Series/OneLifeToLive'' took this to an extreme. Not only did established character Victoria Lord Buchanan develop a number of personalities (the most notorious of which was streetwalker Niki Smith, a full contrast to Viki's upper-crust manner), her daughter Jessica later developed her own split (tough girl Tess), as a result of a retcon where a young Jessica follows Niki to a bar and gets raped by a guy and this was caught on tape. Apparently, in the OLTL universe, split personality is a genetic disorder. In addition, Viki's brother, Todd Manning, at one point was also thought to suffer from DID, with 5 separate personalities: the original Todd, Tommy, a little boy who was the abused Todd as a small child, Rodd, an Italian-accented charmer, and Peter, a representation of Todd's abusive step-father, and a strict female personality that served as the Gatekeeper. At the end of the storyline, Todd admitted he'd been faking all of the personalities, but as he [[PutOnABus left town]] (the actor was leaving the show), a last scene showed Todd and all of his personalities on the plane.
* A patient in ''Series/PrivatePractice'' was alleged to have this condition; she was diagnosed at the age of seven and partially raised by her older sister, and she hasn't had a resurgence in ten years. Unfortunately, they came back with the stress of her sister moving away. [[spoiler:She was actually faking so that they won't move.]]
* Shawn and Gus run into a character with three personalities on ''Series/{{Psych}}''. [[spoiler:Two are male, one is a female, and one is the killer, who is (understandably) a little ticked off that the female personality is scheming to get a sex change.]] When Gus points out how rare the condition is, it is hand-waved by Shawn pointing out it only has to happen once to be true.
* ''Series/{{Sanctuary}}'' has Adam Worth, a genius with a split personality. It's a bit confusing, since both are, apparently, named Adam. The split started after [[spoiler:his daughter got sick and died]]. He blames the Five for this.
* An early episode of ''Series/StarTrekTheOriginalSeries'' pushes the JekyllAndHyde trope to extremes when Captain Kirk is divided into his good and evil halves. And again like ''The Dark Crystal'', Kirk's good half is weak and indecisive while the evil Kirk has his way with pretty much everyone (including, very nearly, Yeoman Rand). He gets better.
* In one episode of ''Series/StargateSG1'', Carter likens being host to a Tok'ra symbiote to having schizophrenia. They meant DID. Apparently, they later did their research, and as though to pay penance for their error, made an episode where Daniel Jackson actually got schizophrenia from an AppliedPhlebotinum that was intended to kill Goa'uld.
** Since DID patients generally aren't aware of their other personalities, but some schizophrenia manifests as ''hearing voices in your head'', maybe they ''did'' mean schizophrenia. The Tok'ra host and symbiote are conscious at the same time regardless of who is controlling the body, and communicate with each other mentally.
* In ''Series/TerminatorTheSarahConnorChronicles'' episode "Allison from Palmdale," [[RobotGirl Cameron]] suffers a glitch due to combat damage she took earlier in the series. As a result, she takes on a completely different identity and personality, that of a girl named Allison Young, a future resistance fighter whom her body was modeled after [[spoiler:and then subsequently killed.]] By the end of the episode, she recovers, though not without [[NightmareFuel supplying the stuff of many an unpleasant dream]] in the process.
* ''Series/UnitedStatesOfTara'': One character has four alternate personalities: a sex-and-drugs addict 15-year-old called T; a disturbing StepfordSmiler housewife named Alice; and a male, rowdy, alcohol- and brawls-loving motorist called Buck; along with [[spoiler:the mysterious Gimme, who was unknown ''even to Tara'' and serves as a kind of "pure id/protector" alter, who comes out whenever Tara gets too close to discovering something which might traumatise her.]]\\
Seasons Two and Three introduce three more personalities: Shoshana Schoenbaum, an alter based on a therapist Tara creates after reading said therapist's book, Chicken, who is essentially Tara when she was five years old, and [[spoiler:Bryce Crane, an alter based on Tara's half-brother who is believed to have sexually molested Tara when she was a child and is the reason why she has DID in the first place. Bryce then proceeds to apparently kill all of the other alters, although the last episode reveals that Buck, T, and Alice are still 'alive'.]]
* Jacqueline Hyde of ''Series/WhereInTimeIsCarmenSandiego'' has two personalities, TheIngenue and OmnicidalManiac, which she repeatedly switches back and forth between. Her "evil" side speaks in VoiceOfTheLegion.
* This is the premise for the Russian comedy series ''Zaitsev+1''. The protagonist, Sasha Zaitsev (sometimes Latinized as Zaicev) is a typical college nerd who is in love with Nastya, the prettiest girl in his class, although she doesn't know it and stays with her cheating JerkJock boyfriend. Whenever Zaitsev gets hit in the head, is blinded by a bright light, or is deafened by a loud noise, he turns into Fyodor, his wild, rude, and cynical alter ego who likes big women. While Fyodor is actually played by a different actor, only the audience perceives him as a different person. Everyone else just notices that Zaitsev is suddenly acting very differently. Fyodor likes to sleep around, especially with [[NamesTheSame another girl named Nastya]], which becomes a problem for Zaitsev, who can't really explain his problem to others without sounding insane.
16th Nov '16 1:27:37 AM HKiyama
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* OlderThanRadio: In the classic Robert Louis Stevenson novel ''Literature/TheStrangeCaseOfDrJekyllAndMrHyde'', Dr. Henry Jekyll develops a formula that separates his good and evil personalities. By drinking the potion, he can transform himself into the villainous Edward Hyde.

to:

* OlderThanRadio: In one ''Literature/{{Animorphs}}'' novel, ''The Separation'', Rachel's personality goes so far as to be split into two physically different people -- one timid, gentle, and pacifistic; the other ruthless, violent, and obsessive -- when she gets cut in half while in starfish morph. Because of starfish's regenerative powers, she "grows back" a ''whole extra person.''
* Most ''Literature/{{Aristoi}}'' cultivate multiple "daimones" to help them multitask. %% It would help to describe what daimones are in this context.
* In ''Literature/ArtemisFowl'', [[spoiler:Artemis]] gets one because of [[spoiler:his Atlantis Complex]].
* Margaret Millar's Edgar-award winning thriller ''Beast In View'', in which a woman who is apparently the victim of a malevolent stalker turns out to be being persecuted by her own malevolent alternate personality, is the UrExample in the crime genre of the "the villain is actually the hero's or [=PoV=] character's evil alternate" idea. Unfortunately, it later became a groanworthy cliche due to simplistic and/or logistically impossible examples.
* ''Beyond Bedlam'' by Wyman Guin depicts a society about 1000 years in the future where everyone is "schizophrenic" (actually, possessed of two personalities; "schizophrenia" rather than "multiple personality disorder" being the accepted medical term in TheFifties) and each of the two personalities is allowed five days of life at a time, before being legally required to surrender the reins to the other personality.
* Subverted in ''Literature/{{Blindsight}}'': one of the characters is a linguist with ''three'' surgically-induced alter personalities (known collectively as the Gang of Four). Some time is taken up in discussion of twentieth-century attitudes towards MPD, which are largely dismissed as barbaric and irrational. The Gang are a relatively realistic depiction of D.I.D cases where all of the personalities know of the others' existence and cooperate.
**
In the classic Robert Louis Stevenson novel ''Literature/TheStrangeCaseOfDrJekyllAndMrHyde'', Dr. Henry Jekyll develops a formula sequel, ''Literature/{{Echopraxia}}'' it turns out that separates his good [[spoiler: vampires are outright {{Mind Hive}}s, and evil personalities. By drinking Valerie bypassed the potion, he can transform himself into crucifix glitch by sacrificing one of her parallel processes. Similar to the villainous Edward Hyde.20th cen hypothesis of D.I.D. that the Gang dismissed as "irrational". Though they did exist before the trauma and vampires are complete sociopaths.]]
* In Creator/JackVance's ''[[Literature/TheDemonPrinces The Book of Dreams]]'', Howard Alan Treesong, the last Demon Prince, has five separate personalities.
* Severian in The ''Literature/BookOfTheNewSun'', who is both the original torturer Severian and also Chatelaine Thecla after eating the Albazo (and Thecla.)



* Mark Meadows, AKA "Captain Trips," of the ''WildCards'' series. Normally a smiling, weirdly dressed, and rather ineffectual hippy (albeit one with great skills in biochemistry), in time of need, his various powders and potions are capable of making him an ace of badass proportions... or rather, several aces, depending on which one he takes. All of them have a different mind and personality, and most of them think the good Captain is a wimp or worse, and do everything they can to keep from reverting when the chemical wears off.
* The protagonist of Simon Hawke's ''Literature/TribeOfOne'' trilogy (set in the ''TabletopGame/DarkSun'' setting of ''TabletopGame/DungeonsAndDragons'') is a man with more personalities than he can count, who [[WalkingTheEarth walks Athas]] in search of a way to bring his fractured mind together.
* In ''Literature/TheLordOfTheRings'' and related materials, it is suggested that [[GollumMadeMeDoIt Gollum's personality]] developed from Sméagol talking to the Ring ("my precious") which he eventually identified as part of himself, as well as his desire to place the blame for the murder of his friend Déagol onto someone else.
** Gollum's split personality never appeared in the first edition of ''Literature/TheHobbit'': it only shows up first in the {{rewrite}}, when Bilbo hears them discussing after realizing that Bilbo had the Ring all along. At the time of writing the first edition, the Ring wasn't evil yet in Tolkien's mind, and so had no reason to poison Sméagol's mind.
* Subverted in ''Literature/{{Blindsight}}'': one of the characters is a linguist with ''three'' surgically-induced alter personalities (known collectively as the Gang of Four). Some time is taken up in discussion of twentieth-century attitudes towards MPD, which are largely dismissed as barbaric and irrational. The Gang are a relatively realistic depiction of D.I.D cases where all of the personalities know of the others' existence and cooperate.
** In the sequel, ''Literature/{{Echopraxia}}'' it turns out that [[spoiler: vampires are outright {{Mind Hive}}s, and Valerie bypassed the crucifix glitch by sacrificing one of her parallel processes. Similar to the 20th cen hypothesis of D.I.D. that the Gang dismissed as "irrational". Though they did exist before the trauma and vampires are complete sociopaths.]]

to:

* Mark Meadows, AKA "Captain Trips," of In Creator/StephenKing's ''Franchise/TheDarkTower'' series introduces two characters in [[Literature/TheDrawingOfTheThree the ''WildCards'' series. Normally second book]]: Odetta Holmes, a smiling, weirdly dressed, fairly well-to-do black woman who lost her legs and rather ineffectual hippy (albeit one with great skills in biochemistry), in time of need, his various powders is generally surviving the 1960's as best she can; and potions are capable of making him an ace of badass proportions... or rather, several aces, depending on which one he takes. All of them have a different mind Detta Walker, who is dangerous, brutal, and personality, and most of them think the good Captain is a wimp or worse, and do everything they can to keep from reverting when the chemical wears off.
*
very bitter. The protagonist of Simon Hawke's ''Literature/TribeOfOne'' trilogy (set in the ''TabletopGame/DarkSun'' setting of ''TabletopGame/DungeonsAndDragons'') is a man with more two personalities than he can count, who [[WalkingTheEarth walks Athas]] in search are almost completely unaware of a way to bring his fractured mind together.
* In ''Literature/TheLordOfTheRings'' and related materials, it is suggested that [[GollumMadeMeDoIt Gollum's personality]] developed from Sméagol talking to
each other, at least until the Ring ("my precious") which he eventually identified as part of himself, as well as his desire to place plot comes knocking. [[spoiler:At the blame for book's climax, the murder of his friend Déagol onto someone else.
** Gollum's split personality never appeared in the first edition of ''Literature/TheHobbit'': it only shows up first in the {{rewrite}}, when Bilbo hears them discussing after realizing that Bilbo had the Ring all along. At the time of writing the first edition, the Ring wasn't evil yet in Tolkien's mind, and so had no reason to poison Sméagol's mind.
* Subverted in ''Literature/{{Blindsight}}'': one of the characters is a linguist with ''three'' surgically-induced alter
two personalities (known collectively as integrate into Susannah Dean, who possesses the Gang of Four). Some time is taken up in discussion of twentieth-century attitudes towards MPD, which are largely dismissed as barbaric and irrational. The Gang are a relatively realistic depiction of D.I.D cases where all good sense of the personalities know former, and the tenacity and will of the others' existence latter]]. Odetta/Dedda is often referred to as "schizophrenic," which is {{justified}} in this case as most of the characters' information on the disorder comes at second- or third-hand from Eddie's recollections of [=80s=] pop culture.
%%%* Sefalet's right
and cooperate.
** In the sequel, ''Literature/{{Echopraxia}}'' it turns out that [[spoiler: vampires are outright {{Mind Hive}}s, and Valerie bypassed the crucifix glitch by sacrificing one of her parallel processes. Similar to the 20th cen hypothesis of D.I.D. that the Gang dismissed as "irrational". Though they did exist before the trauma and vampires are complete sociopaths.]]
left-hand mouths in ''Literature/DirgeForPresterJohn''.



* Creator/LoisMcMasterBujold's ''Literature/VorkosiganSaga'':
** Lord Mark Vorkosigan developed four extra personalities to resist torture: Gorge, Grunt, Howl, and Killer. While he learns to control them, they explicitly do not go away. Fortunately, they are all fixated from the get-go on protecting/aiding Mark to the best of their abilities and like his girlfriend.
** Mark's brother/progenitor Miles hovers upon the verge of this trope when his undercover identity of Admiral Naismith threatens to become a fully separate persona. Mark also laments that at least Miles' alter ego is the sort of person you can dress up and take out to a party if the need arises compared to his far more primal alters.
* Ted Dekker's thriller novel ''Thr3e'' (as well as TheFilmOfTheBook): [[spoiler:The killer who's been chasing the protagonist is actually a split personality of the protagonist. But wait! Isn't the title "three"? That's right! It turns out his childhood friend who's been helping him solve the mystery is ''also'' one of his split personalities.]]
%%%* ''Sybil''
* Creator/SidneySheldon's novel ''Literature/TellMeYourDreams'' is about a woman who fears she is being stalked, and her two co-workers who become concerned about her. It is eventually revealed that all three are the same person; the main character developed two separate personalities because she could not handle the trauma of [[spoiler:childhood sexual abuse]].
* In Creator/StephenKing's ''Franchise/TheDarkTower'' series introduces two characters in [[Literature/TheDrawingOfTheThree the second book]]: Odetta Holmes, a fairly well-to-do black woman who lost her legs and is generally surviving the 1960's as best she can; and Detta Walker, who is dangerous, brutal, and very bitter. The two personalities are almost completely unaware of each other, at least until the plot comes knocking. [[spoiler:At the book's climax, the two personalities integrate into Susannah Dean, who possesses the good sense of the former, and the tenacity and will of the latter]]. Odetta/Dedda is often referred to as "schizophrenic," which is {{justified}} in this case as most of the characters' information on the disorder comes at second- or third-hand from Eddie's recollections of [=80s=] pop culture.
%%%* [[spoiler:Holmes/Moriarty/Jack the Ripper]] in ''Literature/TheLastSherlockHolmesStory''.
* In Amelia Atwater-Rhodes' ''Persistence of Memory'', Erin suffers from DID with the complication that [[spoiler:her alter comes from psychic residue from a vampire attack on her pregnant mother. While the alter that manifests is just the psychic remnant, the basis for Erin's alter, Shevaun, is a very real and very dangerous vampire.]]
* In Creator/JamesSwallow's ''TabletopGame/{{Warhammer 40000}}'' ''[[Literature/BloodAngels Red Fury]]'', the BloodMagic gives the Bloodfiends the GeneticMemory of all those whose blood they drank, giving them effective multiple unintegrated personalities -- and a fierce desire to drink more blood, worsening the problem. Rafen, fighting one, can clearly [[WasOnceAMan recognize the source of its blood]], and {{dying|AsYourself}}, it might have said, "Brother."
* ''Literature/XWingSeries'': Wraith Squadron's "Runt" manages to skirt the reality issue by being, well, an alien - he has a number of highly specialized minds, such as the Pilot and the Student; this is noted to be natural and healthy for his species, and learning to switch quickly between personalities is helpful for him. Lara Notsil/Gara Petothel/Kirney Slane, though she might appear to fit the trope and once dreamed of her [[DoubleConsciousness different personae arguing]], is really a spy who started BecomingTheMask and soon had a [[HeelFaceTurn genuine desire to defect]], as well as some unstable identity issues. No split personality.
%%%* Michael Slade's [[spoiler:''Ghoul'']].
* The [[http://en.wikipedia.org/wiki/The_Last_Dragonlord Dragonlords]] are born with two souls/identities: one human and one dragon. This overlaps into SharingABody in that the two personalities are fully aware of each other and converse at times. The main character, Linden, has trouble controlling [[GollumMadeMeDoIt the anger issues]] of his dragon side, Rathan. His mate's infant-like dragon side refuses to acknowledge her.
* [[spoiler:This is the big twist]] of ''Literature/FightClub''. About 2/3 through the book, the reader [[spoiler:and the narrator find out that Tyler is the Narrator.]]
* Severian in The ''Literature/BookOfTheNewSun'', who is both the original torturer Severian and also Chatelaine Thecla after eating the Albazo (and Thecla.)

to:

* Creator/LoisMcMasterBujold's ''Literature/VorkosiganSaga'':
** Lord Mark Vorkosigan developed four extra personalities to resist torture: Gorge, Grunt, Howl, and Killer. While he learns to control them, they explicitly do not go away. Fortunately, they are all fixated from
In ''Literature/EdenGreen'', humans infected with the get-go on protecting/aiding Mark to the best of their abilities and like his girlfriend.
** Mark's brother/progenitor Miles hovers upon the verge of this trope when his undercover identity of Admiral Naismith threatens to become
needle symbiote eventually develop a fully separate persona. Mark also laments that at least Miles' alter ego is the sort of person you can dress up and take out to a party if the need arises compared to his far more primal alters.
* Ted Dekker's thriller novel ''Thr3e'' (as well as TheFilmOfTheBook): [[spoiler:The killer who's been chasing the protagonist is actually a split
second, psychotic, survival-oriented personality capable of the protagonist. But wait! Isn't the title "three"? That's right! It turns out his childhood friend who's been helping him solve the mystery is ''also'' one of his split personalities.]]
%%%* ''Sybil''
* Creator/SidneySheldon's novel ''Literature/TellMeYourDreams'' is about a woman who fears she is being stalked, and her two co-workers who become concerned about her. It is eventually revealed
performing horrible deeds that all three are the same person; the main character developed two separate personalities because she could not handle the trauma of [[spoiler:childhood sexual abuse]].
* In Creator/StephenKing's ''Franchise/TheDarkTower'' series introduces two characters in [[Literature/TheDrawingOfTheThree the second book]]: Odetta Holmes, a fairly well-to-do black woman who lost her legs and is generally surviving the 1960's as best she can; and Detta Walker, who is dangerous, brutal, and very bitter. The two personalities are almost completely unaware of each other, at least until the plot comes knocking. [[spoiler:At the book's climax, the two personalities integrate into Susannah Dean, who possesses the good sense of the former, and the tenacity and will of the latter]]. Odetta/Dedda is often referred to as "schizophrenic," which is {{justified}} in this case as most of the characters' information on the disorder comes at second- or third-hand from Eddie's recollections of [=80s=] pop culture.
%%%* [[spoiler:Holmes/Moriarty/Jack the Ripper]] in ''Literature/TheLastSherlockHolmesStory''.
* In Amelia Atwater-Rhodes' ''Persistence of Memory'', Erin suffers from DID with the complication that [[spoiler:her alter comes from psychic residue from a vampire attack on her pregnant mother. While the alter that manifests is just the psychic remnant, the basis for Erin's alter, Shevaun, is a very real and very dangerous vampire.]]
* In Creator/JamesSwallow's ''TabletopGame/{{Warhammer 40000}}'' ''[[Literature/BloodAngels Red Fury]]'', the BloodMagic gives the Bloodfiends the GeneticMemory of all those whose blood they drank, giving them effective multiple unintegrated personalities -- and a fierce desire to drink more blood, worsening the problem. Rafen, fighting one, can clearly [[WasOnceAMan recognize the source of its blood]], and {{dying|AsYourself}}, it might have said, "Brother."
* ''Literature/XWingSeries'': Wraith Squadron's "Runt" manages to skirt the reality issue by being, well, an alien - he has a number of highly specialized minds, such as the Pilot and the Student; this is noted to be natural and healthy for his species, and learning to switch quickly between personalities is helpful for him. Lara Notsil/Gara Petothel/Kirney Slane, though she might appear to fit the trope and once dreamed of her [[DoubleConsciousness different personae arguing]], is really a spy who started BecomingTheMask and soon had a [[HeelFaceTurn genuine desire to defect]], as well as some unstable identity issues. No split personality.
%%%* Michael Slade's [[spoiler:''Ghoul'']].
* The [[http://en.wikipedia.org/wiki/The_Last_Dragonlord Dragonlords]] are born with two souls/identities: one human and one dragon. This overlaps into SharingABody in that the two personalities are fully aware of each other and converse at times. The main character, Linden, has trouble controlling [[GollumMadeMeDoIt the anger issues]] of his dragon side, Rathan. His mate's infant-like dragon side refuses to acknowledge her.
* [[spoiler:This is the big twist]] of ''Literature/FightClub''. About 2/3 through the book, the reader [[spoiler:and the narrator find out that Tyler is the Narrator.]]
* Severian in The ''Literature/BookOfTheNewSun'', who is both
the original torturer Severian and also Chatelaine Thecla after eating the Albazo (and Thecla.)human could.



* In Creator/JackVance's ''[[Literature/TheDemonPrinces The Book of Dreams]]'', Howard Alan Treesong, the last Demon Prince, has five separate personalities.
* Ellen Hopkins' [[spoiler:Identical]] has a more realistic case of this. Near the end, it is revealed that [[spoiler:Kaeleigh has DID and Raeanne is her other personality. The real Raeanne died in a car accident during the twins' childhood.]]
* In ''Literature/ArtemisFowl'', [[spoiler:Artemis]] gets one because of [[spoiler:his Atlantis Complex]].
* Done in a fairly realistic way in Matt Ruff's ''Literature/SetThisHouseInOrder'' with two characters who both have DID. Both suffered severe abuse as children, but one has been aware of this problem for a long time, and all the personalities work together and see a psychiatrist. The other character is younger and less aware of what is going on, and is afraid because she keeps having periods of memory loss. Both characters eventually work towards the goals of overcoming abuse, getting treatment, and choosing between full integration and trying to function by having all personalities cooperate with each other.



* ''Literature/TheWheelOfTime'':
** [[spoiler:Rand al'Thor and Lews Therin]] fit this trope as well as anything else. It's difficult to determine if it's caused by madness from use of the One Power or being a reincarnation of the original and the voice is actually a real being. In any case, [[spoiler:Rand]] certainly thinks he's suffering from madness. At the end of the 12th book, [[spoiler:they pull a SplitPersonalityMerge, after which it's explicitly stated that they 'aren't two men and never were' -- that is, Rand is most definitely the reincarnation of Lews Therin, and he also most definitely had some access to snippets of Lews Therin's memories and knowledge as a result, but the 'voice' of Lews Therin that Rand conversed with for six books was merely a symptom of his deteriorating mental state]].
** The series also includes a couple of weird borderline examples with the recurring villains [[AxCrazy Padan Fain]] and [[ProfessionalKiller Slayer]]. Fain merged imperfectly with the soul of the EvilChancellor Mordeth, and though he thinks of himself as one personality, he has two distinct sets of mannerisms which he'll switch between randomly and apparently unwittingly, and sometimes he'll forget which of the two names he's currently using. Slayer is actually two distinct men named Luc and Isam who share a body; they were combined into one by [[GodOfEvil the Dark One]], but retain discrete identities to the point that when which personality is dominant changes, the body also changes to reflect it.
* In the ''Literature/NewJediOrder'' series, teen Jedi [[ActionGirl Tahiri]] has this after a [[MadScientist Shaper's]] attempt to transform her into a Force-using [[ScaryDogmaticAliens Yuuzhan Vong]] fails -- Tahiri retains her original personality, but the Vong personality can't be excised and remains in her subconscious. Ultimately, Riina (Tahiri's Vong half) tries to pull a SplitPersonalityTakeover, but when she and human Tahiri prove too connected for this to work out, a SplitPersonalityMerge happens instead. The resulting person calls herself Tahiri, but has the memories and experiences of both.
* ''Literature/TheMindsOfBillyMilligan'' is the true story of a man with multiple personalities.



* In one ''Literature/{{Animorphs}}'' novel, ''The Separation'', Rachel's personality goes so far as to be split into two physically different people -- one timid, gentle, and pacifistic; the other ruthless, violent, and obsessive -- when she gets cut in half while in starfish morph. Because of starfish's regenerative powers, she "grows back" a ''whole extra person.''

to:

* In one ''Literature/{{Animorphs}}'' [[spoiler:This is the big twist]] of ''Literature/FightClub''. About 2/3 through the book, the reader [[spoiler:and the narrator find out that Tyler is the Narrator.]]
* Used as a MindScrew in ''Literature/{{Ghoul}}'' by Creator/MichaelSlade. The BigBad of the
novel, ''The Separation'', Rachel's [[spoiler: Saxon Hyde]] comes from an "old money" family where madness runs in the genes. The villain's DID is the result of childhood sexual abuse, ''however'' upon another traumatic event, the villain suffers a complete break with reality and it becomes [[ItMakesSenseInContext full-blown paranoid schizophrenia.]] A veritable grab-bag of crazies, all in one character.
* In ''Literature/TheHeroesOfOlympus'', the conflict between the Roman and Greek camps causes some serious issues for the gods, since there are equal calls for their Roman and Greek sides. This causes the sides to battle for dominance, the consequences of which vary in severity depending on how different the Roman and Greek aspects are. Gods like Aphrodite/Venus or Nemesis walk off scot-free, since the ideas of love and revenge are the same in Greece and Rome. Hercules/Heracles gets headaches, but otherwise it isn't too bad. Athena/Minerva is reduced to a scatter-brained wreck and Dionysus/Bacchus can't remember Percy and gets a blinding headache when Percy calls him Dionysus instead of Bacchus. The issue is apparently grave enough for them to be rendered incapable of dealing with other problems until the issue is resolved.
* Ellen Hopkins' ''Identical'' has a more realistic case of this. Near the end, it is revealed that [[spoiler:Kaeleigh has DID and Raeanne is her other personality. The real Raeanne died in a car accident during the twins' childhood.]]
* {{Averted}} in Geoph Essex's ''Jackrabbit Messiah'': Jack has [[ShownTheirWork schizophrenia]], not [[HollywoodPsych DID]], though the end result is that he plays [[OddCouple Oscar Madison to the Felix Unger]] living inside his head, suggesting similarities to the favorite sort of fictional split
personality goes so far as to be split into two physically different people -- one timid, gentle, and pacifistic; (especially during a [[LiteralSplitPersonality more surrealistic portion of the other ruthless, violent, and obsessive -- when she gets cut in half while in starfish morph. Because of starfish's regenerative powers, she "grows back" a ''whole extra person.''climax]]).



* In Creator/MichaelFlynn's ''[[Literature/SpiralArm Up Jim River]]'', Donovan. His multiple personalities were induced deliberately, but the manner was bungled -- also, perhaps, deliberately.
%%%* Sefalet's right and left-hand mouths in ''Literature/DirgeForPresterJohn''.

to:

* In Creator/MichaelFlynn's ''[[Literature/SpiralArm Up Jim River]]'', Donovan. His multiple The titular Dragonlords from ''The Last Dragonlord'' are born with two souls/identities: one human and one dragon. This overlaps into SharingABody in that the two personalities were induced deliberately, are fully aware of each other and converse at times. The main character, Linden, has trouble controlling [[GollumMadeMeDoIt the anger issues]] of his dragon side, Rathan. His mate's infant-like dragon side refuses to acknowledge her.
%%%* [[spoiler:Holmes/Moriarty/Jack the Ripper]] in ''Literature/TheLastSherlockHolmesStory''.
* In ''Literature/TheLordOfTheRings'' and related materials, it is suggested that [[GollumMadeMeDoIt Gollum's personality]] developed from Sméagol talking to the Ring ("my precious") which he eventually identified as part of himself, as well as his desire to place the blame for the murder of his friend Déagol onto someone else.
** Gollum's split personality never appeared in the first edition of ''Literature/TheHobbit'': it only shows up first in the {{rewrite}}, when Bilbo hears them discussing after realizing that Bilbo had the Ring all along. At the time of writing the first edition, the Ring wasn't evil yet in Tolkien's mind, and so had no reason to poison Sméagol's mind.
* ''Literature/TheMindsOfBillyMilligan'' is the true story of a man with multiple personalities.
* In the ''Literature/NewJediOrder'' series, teen Jedi [[ActionGirl Tahiri]] has this after a [[MadScientist Shaper's]] attempt to transform her into a Force-using [[ScaryDogmaticAliens Yuuzhan Vong]] fails -- Tahiri retains her original personality,
but the manner was bungled -- also, perhaps, deliberately.
%%%* Sefalet's right
Vong personality can't be excised and left-hand mouths remains in ''Literature/DirgeForPresterJohn''.her subconscious. Ultimately, Riina (Tahiri's Vong half) tries to pull a SplitPersonalityTakeover, but when she and human Tahiri prove too connected for this to work out, a SplitPersonalityMerge happens instead. The resulting person calls herself Tahiri, but has the memories and experiences of both.
* In Amelia Atwater-Rhodes' ''Persistence of Memory'', Erin suffers from DID with the complication that [[spoiler:her alter comes from psychic residue from a vampire attack on her pregnant mother. While the alter that manifests is just the psychic remnant, the basis for Erin's alter, Shevaun, is a very real and very dangerous vampire.]]
* In Creator/JamesSwallow's ''TabletopGame/{{Warhammer 40000}}'': ''[[Literature/BloodAngels Red Fury]]'', the BloodMagic gives the Bloodfiends the GeneticMemory of all those whose blood they drank, giving them effective multiple unintegrated personalities -- and a fierce desire to drink more blood, worsening the problem. Rafen, fighting one, can clearly [[WasOnceAMan recognize the source of its blood]], and {{dying|AsYourself}}, it might have said, "Brother."
* Done in a fairly realistic way in Matt Ruff's ''Literature/SetThisHouseInOrder'' with two characters who both have DID. Both suffered severe abuse as children, but one has been aware of this problem for a long time, and all the personalities work together and see a psychiatrist. The other character is younger and less aware of what is going on, and is afraid because she keeps having periods of memory loss. Both characters eventually work towards the goals of overcoming abuse, getting treatment, and choosing between full integration and trying to function by having all personalities cooperate with each other.



* In ''Literature/TheHeroesOfOlympus'', the conflict between the Roman and Greek camps causes some serious issues for the gods, since there are equal calls for their Roman and Greek sides. This causes the sides to battle for dominance, the consequences of which vary in severity depending on how different the Roman and Greek aspects are. Gods like Aphrodite/Venus or Nemesis walk off scot-free, since the ideas of love and revenge are the same in Greece and Rome. Hercules/Heracles gets headaches, but otherwise it isn't too bad. Athena/Minerva is reduced to a scatter-brained wreck and Dionysus/Bacchus can't remember Percy and gets a blinding headache when Percy calls him Dionysus instead of Bacchus. The issue is apparently grave enough for them to be rendered incapable of dealing with other problems until the issue is resolved.
* Most ''Literature/{{Aristoi}}'' cultivate multiple "daimones" to help them multitask.
* "Beyond Bedlam" by Wyman Guin depicts a society about 1000 years in the future where everyone is "schizophrenic" (actually, possessed of two personalities; "schizophrenia" rather than "multiple personality disorder" being the accepted medical term in TheFifties) and each of the two personalities is allowed five days of life at a time, before being legally required to surrender the reins to the other personality.
* {{Averted}} in Geoph Essex's ''Jackrabbit Messiah'': Jack has [[ShownTheirWork schizophrenia]], not [[HollywoodPsych DID]], though the end result is that he plays [[OddCouple Oscar Madison to the Felix Unger]] living inside his head, suggesting similarities to the favorite sort of fictional split personality (especially during a [[LiteralSplitPersonality more surrealistic portion of the climax]]).
* In the Creator/MichaelSwanwick novel ''Literature/VacuumFlowers'', Wyeth has deliberated installed four distinct personalities into his own mind, modeled after archetypes (he says it's based on the ideal makeup for an aboriginal hunting party). All of them are active simultaneously and seem to get along fine; in emergency situations, they all voluntarily step aside for the persona best able to handle that particular type of emergency, and in non-emergencies they make decisions by consensus. The heroine Rebel/Eucrasia is a straighter example; the body belongs to Eucrasia, but the personality in charge at the start is Rebel, who has been overlaid on top of Eucrasia due to an accident with some entertainment software.
* In ''When the Bough Breaks'' (part of Creator/MercedesLackey's [=SERRAted Edge=] series), a young girl develops multiple personalities when her father starts raping her. One personality takes over whenever she realizes a rape is about to occur, to protect the other personalities from knowing what's been going on.
* Used as a MindScrew in ''Literature/{{Ghoul}}'' by Creator/MichaelSlade. The BigBad of the novel, [[spoiler: Saxon Hyde]] comes from an "old money" family where madness runs in the genes. The villain's DID is the result of childhood sexual abuse, ''however'' upon another traumatic event, the villain suffers a complete break with reality and it becomes [[ItMakesSenseInContext full-blown paranoid schizophrenia.]] A veritable grab-bag of crazies, all in one character.
* In ''Literature/EdenGreen'', humans infected with the needle symbiote eventually develop a second, psychotic, survival-oriented personality capable of performing horrible deeds that the original human could.
* Margaret Millar's Edgar-award winning thriller ''Beast In View'', in which a woman who is apparently the victim of a malevolent stalker turns out to be being persecuted by her own malevolent alternate personality, is the UrExample in the crime genre of the "the villain is actually the hero's or [=PoV=] character's evil alternate" idea. Unfortunately, it later became a groanworthy cliche due to simplistic and/or logistically impossible examples.

to:

* OlderThanRadio: In ''Literature/TheHeroesOfOlympus'', the conflict between classic Robert Louis Stevenson novel ''Literature/TheStrangeCaseOfDrJekyllAndMrHyde'', Dr. Henry Jekyll develops a formula that separates his good and evil personalities. By drinking the Roman potion, he can transform himself into the villainous Edward Hyde.
%%%* ''Sybil''
* Creator/SidneySheldon's novel ''Tell Me Your Dreams'' is about a woman who fears she is being stalked,
and Greek camps causes some serious issues for the gods, since there are equal calls for their Roman and Greek sides. This causes the sides to battle for dominance, the consequences of which vary in severity depending on how different the Roman and Greek aspects are. Gods like Aphrodite/Venus or Nemesis walk off scot-free, since the ideas of love and revenge her two co-workers who become concerned about her. It is eventually revealed that all three are the same in Greece and Rome. Hercules/Heracles gets headaches, but otherwise it isn't too bad. Athena/Minerva is reduced to a scatter-brained wreck and Dionysus/Bacchus can't remember Percy and gets a blinding headache when Percy calls him Dionysus instead of Bacchus. The issue is apparently grave enough for them to be rendered incapable of dealing with other problems until person; the issue is resolved.
* Most ''Literature/{{Aristoi}}'' cultivate multiple "daimones" to help them multitask.
* "Beyond Bedlam" by Wyman Guin depicts a society about 1000 years in the future where everyone is "schizophrenic" (actually, possessed of
main character developed two personalities; "schizophrenia" rather than "multiple personality disorder" being the accepted medical term in TheFifties) and each of the two separate personalities is allowed five days of life at a time, before being legally required to surrender because she could not handle the reins to trauma of [[spoiler:childhood sexual abuse]].
* Ted Dekker's thriller novel ''Thr3e'' (as well as TheFilmOfTheBook): [[spoiler:The killer who's been chasing
the other personality.
* {{Averted}} in Geoph Essex's ''Jackrabbit Messiah'': Jack has [[ShownTheirWork schizophrenia]], not [[HollywoodPsych DID]], though the end result
protagonist is that he plays [[OddCouple Oscar Madison to the Felix Unger]] living inside his head, suggesting similarities to the favorite sort of fictional actually a split personality (especially during a [[LiteralSplitPersonality more surrealistic portion of the climax]]).
protagonist. But wait! Isn't the title "three"? That's right! It turns out his childhood friend who's been helping him solve the mystery is ''also'' one of his split personalities.]]
* The protagonist of Simon Hawke's ''Tribe of One'' trilogy (set in the ''TabletopGame/DarkSun'' setting of ''TabletopGame/DungeonsAndDragons'') is a man with more personalities than he can count, who [[WalkingTheEarth walks Athas]] in search of a way to bring his fractured mind together.
* In Creator/MichaelFlynn's ''[[Literature/SpiralArm Up Jim River]]'', Donovan. His multiple personalities were induced deliberately, but the manner was bungled -- also, perhaps, deliberately.
* In the Creator/MichaelSwanwick novel ''Literature/VacuumFlowers'', ''Vacuum Flowers'', Wyeth has deliberated installed four distinct personalities into his own mind, modeled after archetypes (he says it's based on the ideal makeup for an aboriginal hunting party). All of them are active simultaneously and seem to get along fine; in emergency situations, they all voluntarily step aside for the persona best able to handle that particular type of emergency, and in non-emergencies they make decisions by consensus. The heroine Rebel/Eucrasia is a straighter example; the body belongs to Eucrasia, but the personality in charge at the start is Rebel, who has been overlaid on top of Eucrasia due to an accident with some entertainment software.
* Creator/LoisMcMasterBujold's ''Literature/VorkosiganSaga'':
** Lord Mark Vorkosigan developed four extra personalities to resist torture: Gorge, Grunt, Howl, and Killer. While he learns to control them, they explicitly do not go away. Fortunately, they are all fixated from the get-go on protecting/aiding Mark to the best of their abilities and like his girlfriend.
** Mark's brother/progenitor Miles hovers upon the verge of this trope when his undercover identity of Admiral Naismith threatens to become a fully separate persona. Mark also laments that at least Miles' alter ego is the sort of person you can dress up and take out to a party if the need arises compared to his far more primal alters.
* ''Literature/TheWheelOfTime'':
** [[spoiler:Rand al'Thor and Lews Therin]] fit this trope as well as anything else. It's difficult to determine if it's caused by madness from use of the One Power or being a reincarnation of the original and the voice is actually a real being. In any case, [[spoiler:Rand]] certainly thinks he's suffering from madness. At the end of the 12th book, [[spoiler:they pull a SplitPersonalityMerge, after which it's explicitly stated that they 'aren't two men and never were' -- that is, Rand is most definitely the reincarnation of Lews Therin, and he also most definitely had some access to snippets of Lews Therin's memories and knowledge as a result, but the 'voice' of Lews Therin that Rand conversed with for six books was merely a symptom of his deteriorating mental state]].
** The series also includes a couple of weird borderline examples with the recurring villains [[AxCrazy Padan Fain]] and [[ProfessionalKiller Slayer]]. Fain merged imperfectly with the soul of the EvilChancellor Mordeth, and though he thinks of himself as one personality, he has two distinct sets of mannerisms which he'll switch between randomly and apparently unwittingly, and sometimes he'll forget which of the two names he's currently using. Slayer is actually two distinct men named Luc and Isam who share a body; they were combined into one by [[GodOfEvil the Dark One]], but retain discrete identities to the point that when which personality is dominant changes, the body also changes to reflect it.
* In ''When the Bough Breaks'' (part of Creator/MercedesLackey's [=SERRAted Edge=] ''[=SERRAted Edge=]'' series), a young girl develops multiple personalities when her father starts raping her. One personality takes over whenever she realizes a rape is about to occur, to protect the other personalities from knowing what's been going on.
* Used as a MindScrew in ''Literature/{{Ghoul}}'' by Creator/MichaelSlade. The BigBad Mark Meadows, AKA "Captain Trips," of the novel, [[spoiler: Saxon Hyde]] comes from an "old money" family where madness runs in the genes. The villain's DID is the result of childhood sexual abuse, ''however'' upon another traumatic event, the villain suffers ''WildCards'' series. Normally a complete break smiling, weirdly dressed, and rather ineffectual hippy (albeit one with reality great skills in biochemistry), in time of need, his various powders and it becomes [[ItMakesSenseInContext full-blown paranoid schizophrenia.]] A veritable grab-bag of crazies, all in one character.
* In ''Literature/EdenGreen'', humans infected with the needle symbiote eventually develop a second, psychotic, survival-oriented personality
potions are capable of performing horrible deeds that the original human could.
* Margaret Millar's Edgar-award winning thriller ''Beast In View'', in
making him an ace of badass proportions... or rather, several aces, depending on which a woman who is apparently the victim one he takes. All of them have a malevolent stalker turns out to be being persecuted by her own malevolent alternate different mind and personality, is and most of them think the UrExample in good Captain is a wimp or worse, and do everything they can to keep from reverting when the crime genre of chemical wears off.
* ''Literature/XWingSeries'': Wraith Squadron's "Runt" manages to skirt
the "the villain is actually reality issue by being, well, an alien - he has a number of highly specialized minds, such as the hero's or [=PoV=] character's evil alternate" idea. Unfortunately, it later became a groanworthy cliche due Pilot and the Student; this is noted to simplistic and/or logistically impossible examples.be natural and healthy for his species, and learning to switch quickly between personalities is helpful for him. Lara Notsil/Gara Petothel/Kirney Slane, though she might appear to fit the trope and once dreamed of her [[DoubleConsciousness different personae arguing]], is really a spy who started BecomingTheMask and soon had a [[HeelFaceTurn genuine desire to defect]], as well as some unstable identity issues. No split personality.
16th Nov '16 12:50:18 AM HKiyama
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* ''Film/{{Psycho}}''.
* [[spoiler:Tom Hanniger]], the real killer in ''Film/MyBloodyValentine3D''.
* [[spoiler:Axel Palmer]], the killer in the original ''Film/MyBloodyValentine''.
* Gollum and Sméagol ("Stinker" and "Slinker") from Peter Jackson's ''Film/TheLordOfTheRings'' live-action movies. The two personalities frequently carry on conversations, to the point that they're practically two minds consciously coexisting simultaneously in the same head. This split-personality theme is less pronounced in the earlier animated movies and the original books, but still present. See entry under GollumMadeMeDoIt.
* In [[TheFilmOfTheBook the movie]] ''Film/PrimalFear'', the shy and gentle Aaron, on trial for killing the archbishop, is revealed to have a split personality named Roy who is much more outspoken and aggressive and did in fact kill the clergyman. At the end, we also find out that [[spoiler:Aaron doesn't actually have a split personality; the more disturbing truth is that ''Roy'' created ''Aaron'' and has been hiding behind the fake personality for years.]]

to:

* ''Film/{{Psycho}}''.
* [[spoiler:Tom Hanniger]],
In ''Film/{{Adaptation}}'', Donald Kaufman writes a script titled ''The Three'', in which the real killer in ''Film/MyBloodyValentine3D''.
* [[spoiler:Axel Palmer]],
serial killer, the killer in cop chasing him, and the original ''Film/MyBloodyValentine''.
* Gollum and Sméagol ("Stinker" and "Slinker") from Peter Jackson's ''Film/TheLordOfTheRings'' live-action movies. The two personalities frequently carry on conversations, to
victim the point that they're practically two minds consciously coexisting simultaneously cop falls in love with are all the same head. This split-personality theme is less pronounced in person. His brother Charlie points out [[StylisticSuck how idiotic and filled with]] FridgeLogic the earlier animated movies and film is.
* ''Film/BlackSwan'' clearly is meant to make
the original books, viewer think this is going on, but still present. See entry under GollumMadeMeDoIt.
* In [[TheFilmOfTheBook the movie]] ''Film/PrimalFear'', the shy and gentle Aaron, on trial for killing the archbishop, is revealed
it ultimately [[MindScrew leaves it ambiguous]] as to have whether [[spoiler:Nina has a split personality named Roy who is much more outspoken and aggressive and did in fact kill or not;]] the clergyman. At case could be made either way.
* ''Film/TheDarkCrystal'' pushes
the end, we also find out that [[spoiler:Aaron doesn't actually have a JekyllAndHyde trope to extremes when the [=urSkeks=], in an attempt to purge all evil from their nature, split personality; themselves into the more disturbing truth is very, very good (but largely helpless) Mystics and the evil and proactively murderous Skeksis. They get better.
* Surprisingly averted with Two-Face in ''Film/TheDarkKnight''. Several other diagnoses can surely be made. For one, he still likes to make simple moral decisions based on a coin flip, and acts... should we say, chaotically. He uses the coin when deciding the fates of the people he holds responsible for everything
that ''Roy'' created ''Aaron'' and has been hiding behind happened to him in the fake personality for years.]]last day or so. He's on a revenge spree, using the coin to illustrate the arbritariness of it all.



* The TwistEnding of ''Film/DressedToKill'' reveals that [[spoiler:Dr. Elliott inhabits an alter-ego, the murderous transsexual Bobbi.]]



* ''Film/TheMachinist'', which is ''sort of'' a deconstruction of both ''Film/FightClub'' and ''Literature/CrimeAndPunishment'', explores the psychological side of this and the kind of trauma that can cause it.
* The Farrelly Brothers' movie ''Film/MeMyselfAndIrene'' is about a mild-mannered cop who is routinely abused, leading him to eventually flip out and become a jerk.
* ''Film/{{Sybil}}'', based on a 'true story' of Shirley Ardell Mason.
* ''Film/{{Identity}}'' [[spoiler:has the first plot twist uncovering that the characters are all split personalities at a BattleInTheCenterOfTheMind]].
* In ''Film/{{Adaptation}}'', Donald Kaufman writes a script titled ''The Three'', in which the serial killer, the cop chasing him, and the victim the cop falls in love with are all the same person. His brother Charlie points out [[StylisticSuck how idiotic and filled with]] FridgeLogic the film is.



* In the movie ''Peacock'', the painfully shy John (Creator/CillianMurphy) has a more confidant personality named Emma who makes him breakfast and lays out his clothes every day, like a wife would -- which is precisely what everyone thinks she is when she is accidentally discovered. The personalities are aware of one another, but they have no memory of the other's experiences. John gets increasingly panicked as Emma begins to 'control' him more, and [[spoiler:Emma eventually 'murders' John by staging his death and presenting as Emma only.]]

to:

* In the movie ''Peacock'', the painfully shy John (Creator/CillianMurphy) has a more confidant personality named Emma who makes him breakfast and lays out his clothes every day, like a wife would -- which is precisely what everyone thinks she is when she is accidentally discovered. The personalities are aware of one another, but they have no memory One of the other's experiences. John gets increasingly panicked as Emma begins to 'control' him more, protagonists in the Russian comedy ''Gun with a Silencer'' "becomes" a woman between midnight and [[spoiler:Emma eventually 'murders' John noon. One hilarious scene involves "her" being examined by staging his death a gynecologist, who takes one look at the plumbing, [[INeedAFreakingDrink drinks a shot of vodka]], and presenting as Emma only.]]says "she's healthy".



* Surprisingly averted with Two-Face in ''Film/TheDarkKnight''. Several other diagnoses can surely be made. For one, he still likes to make simple moral decisions based on a coin flip, and acts... should we say, chaotically. He uses the coin when deciding the fates of the people he holds responsible for everything that happened to him in the last day or so. He's on a revenge spree, using the coin to illustrate the arbritariness of it all.
* ''Film/BlackSwan'' clearly is meant to make the viewer think this is going on, but it ultimately [[MindScrew leaves it ambiguous]] as to whether [[spoiler:Nina has a split personality or not;]] the case could be made either way.
* In ''Film/PsychoBeachParty'' you learn very early on that Chicklet has at least two other personalities.
* Carter in ''Film/RaisingCain'' has several, including the amoral Cain and his "fall guy" Josh.



* The TwistEnding of ''Film/DressedToKill'' reveals that [[spoiler:Dr. Elliott inhabits an alter-ego, the murderous transsexual Bobbi.]]
* One of the protagonists in the Russian comedy ''Gun with a Silencer'' "becomes" a woman between midnight and noon. One hilarious scene involves "her" being examined by a gynecologist, who takes one look at the plumbing, [[INeedAFreakingDrink drinks a shot of vodka]], and says "she's healthy".
* By Nick's choosing in ''Film/YouthInRevolt''.
* ''Film/TheDarkCrystal'' pushes the JekyllAndHyde trope to extremes when the [=urSkeks=], in an attempt to purge all evil from their nature, split themselves into the very, very good (but largely helpless) Mystics and the evil and proactively murderous Skeksis. They get better.
* ''Film/TheThreeFacesofEve'' is about a timid housewife named Eve White who learns that her splitting headaches and blackouts are the result of having developed a wilder and more free-spirited personality named Eve Black. A more neutral third personality who calls herself just "Jane" eventually emerges too. [[spoiler:The film ends with Jane becoming the dominant and sole personality.]]
* [[spoiler: Clark Stevens]] from ''{{Film/Madhouse2004}}''

to:

* The TwistEnding of ''Film/DressedToKill'' reveals ''Film/{{Identity}}'' [[spoiler:has the first plot twist uncovering that [[spoiler:Dr. Elliott inhabits an alter-ego, the murderous transsexual Bobbi.]]
characters are all split personalities at a BattleInTheCenterOfTheMind]].
* One of Gollum and Sméagol ("Stinker" and "Slinker") from Peter Jackson's ''Film/TheLordOfTheRings'' live-action movies. The two personalities frequently carry on conversations, to the protagonists point that they're practically two minds consciously coexisting simultaneously in the Russian comedy ''Gun with a Silencer'' "becomes" a woman between midnight and noon. One hilarious scene involves "her" being examined by a gynecologist, who takes one look at same head. This split-personality theme is less pronounced in the plumbing, [[INeedAFreakingDrink drinks a shot of vodka]], and says "she's healthy".
* By Nick's choosing in ''Film/YouthInRevolt''.
* ''Film/TheDarkCrystal'' pushes the JekyllAndHyde trope to extremes when the [=urSkeks=], in an attempt to purge all evil from their nature, split themselves into the very, very good (but largely helpless) Mystics
earlier animated movies and the evil and proactively murderous Skeksis. They get better.
* ''Film/TheThreeFacesofEve'' is about a timid housewife named Eve White who learns that her splitting headaches and blackouts are the result of having developed a wilder and more free-spirited personality named Eve Black. A more neutral third personality who calls herself just "Jane" eventually emerges too. [[spoiler:The film ends with Jane becoming the dominant and sole personality.]]
* [[spoiler: Clark Stevens]] from ''{{Film/Madhouse2004}}''
original books, but still present. See entry under GollumMadeMeDoIt.


Added DiffLines:

* ''Film/TheMachinist'', which is ''sort of'' a deconstruction of both ''Film/FightClub'' and ''Literature/CrimeAndPunishment'', explores the psychological side of this and the kind of trauma that can cause it.
%%% * [[spoiler: Clark Stevens]] from ''{{Film/Madhouse2004}}''
* The Farrelly Brothers' movie ''Film/MeMyselfAndIrene'' is about a mild-mannered cop who is routinely abused, leading him to eventually flip out and become a jerk.
* [[spoiler:Axel Palmer]], the killer in the original ''Film/MyBloodyValentine''.
* [[spoiler:Tom Hanniger]], the real killer in ''Film/MyBloodyValentine3D''.
* In the movie ''Peacock'', the painfully shy John (Creator/CillianMurphy) has a more confidant personality named Emma who makes him breakfast and lays out his clothes every day, like a wife would -- which is precisely what everyone thinks she is when she is accidentally discovered. The personalities are aware of one another, but they have no memory of the other's experiences. John gets increasingly panicked as Emma begins to 'control' him more, and [[spoiler:Emma eventually 'murders' John by staging his death and presenting as Emma only.]]
* In [[TheFilmOfTheBook the movie]] ''Film/PrimalFear'', the shy and gentle Aaron, on trial for killing the archbishop, is revealed to have a split personality named Roy who is much more outspoken and aggressive and did in fact kill the clergyman. At the end, we also find out that [[spoiler:Aaron doesn't actually have a split personality; the more disturbing truth is that ''Roy'' created ''Aaron'' and has been hiding behind the fake personality for years.]]
%%% * ''Film/{{Psycho}}''.
* In ''Film/PsychoBeachParty'' you learn very early on that Chicklet has at least two other personalities.
* Carter in ''Film/RaisingCain'' has several, including the amoral Cain and his "fall guy" Josh.


Added DiffLines:

* ''Film/{{Sybil}}'', based on a 'true story' of Shirley Ardell Mason.
* ''Film/TheThreeFacesofEve'' is about a timid housewife named Eve White who learns that her splitting headaches and blackouts are the result of having developed a wilder and more free-spirited personality named Eve Black. A more neutral third personality who calls herself just "Jane" eventually emerges too. [[spoiler:The film ends with Jane becoming the dominant and sole personality.]]
* By Nick's choosing in ''Film/YouthInRevolt''.
This list shows the last 10 events of 320. Show all.
http://tvtropes.org/pmwiki/article_history.php?article=Main.SplitPersonality