Split Personality / Western Animation

• Ace Lightning has Random Virus, a cyborg with one good and one evil personality. He's constantly fighting between them though how much these two sides of him are indivdiuals is unclear.
• Played for Laughs as a twist in American Dad! when Roger, the alien with the Paper-Thin Disguise, hunts down someone who used his credit card only to discover it's himself, as a persona of his that gained a will of its own.
  • Stan ends up going through something similar in another episode: the other personality takes over when Stan is asleep, and is Stan's long-ignored conscience.
• Batman: The Animated Series:
  • Played seriously with the "evil" personality of Two-Face almost completely consuming the mind of Harvey Dent to the point where the "good" personality rarely surfaced again, much to Batman's dismay. This got taken to a weird and extreme level when the killer vigilante "The Judge" appeared and started trying to kill Batman's rogue's gallery, including Two-Face, with death traps. The Judge turned out to be an alternate personality of Two-Face himself, who had no idea that he was the same person.
  • Baby Doll alternated between being Baby, the Cheerful Child she once played and whom she had slipped into in obsession, and Mary Dahl, the sane adult woman. Her account of how it split was a Tear Jerker.
    "Father": We're actors, remember? You cancelled our show because you whined you weren't getting enough attention!
    Baby Doll: But I knows now I made a boo-boo! [as Dahl] It was hard for me out there. I studied and trained and auditioned, but no-one wanted me. Over the years I remembered how happy I was with all you around me, and the folks at home watching me each week... Me. [as Baby] Baby Doll. Hee hee! Now I'm Baby for good, and everyone will love me again!
  • And then there was the Ventriloquist and Scarface, the latter of which is a separate personality of the former, embodied in a ventriloquist dummy with a machine gun. Both personalities are present at the same time, it's just that the Ventriloquist can't acknowledge that he's the one working Mr. Scarface and giving him voice rather than the puppet being his own person. This is clearly seen where Scarface sleeps in a lavish bedroom, and the Ventriloquist sleeps in a closet. It's occasionally hinted that Scarface has a will of his own, but that's just silly.
    • The Batman takes this even further: Scarface's ventriloquist is "Reformed" by being given a new puppet meant to be a "Good" alternate personality. And it works, too: the new puppet even gives Batman the hint that Scarface is on the loose again.
    • The Batman: The Animated Series version of Scarface episode went so far as to describe the Ventriloquist and his dummy as two separate people who were born trapped in the same body, with Batman making an analogy to Siamese twins. Split Personalities Do Not Work That Way, to put it mildly, but the series did go on to provide a more realistic portrayal of Dissociative Identity Disorder with Two-Face, whose personalities are different facets of Harvey's mind.
• Done as a visual pun in the Beany and Cecil episode "The Seventh Voyage of Singood." Dishonest John is Singood; he uses an inebriated little genie named Greenie to do his dirty work. When it turns against him, D.J./Singood takes a scimitar to genie and instead of slicing him in half, he winds up duplicating the genie. "Split personality," D.J. comments.
  Greenie the Genie: I'm a sweetheart to Sigmund Freud! (Hiccup!)
• In Beavis and Butt-Head, The Great Cornholio makes his appearance whenever Beavis has too much sugar and/or caffeine, and when he comes back to himself (usually in some awkward situation), he doesn't remember Cornholio's actions.
• The Celestialsapiens (Alien X) of Ben 10 are a race of Physical Gods with reality-warping powers that also have debilitating split personalities that prevent them from even moving unless both personalities can agree on something.
  • In Ben 10: Omniverse, mentally unwell Dark Magical Girl Charmcaster constantly flips between energetic, Affably Evil CloudCuckoolander and ruthless magic addict, with the second personality being encouraged by her poisonous captives.
• Dr. Splitz/Splitzy in Captain Simian and the Space Monkeys. Apart from his Meaningful Name, he's also notable in being The Smart Guy. Sort of. Dr. Splitz is incredibly intelligent, while Splitzy is an impulsive moron. However, they both seem to share incredible knowledge of electronics and machinery, and Splitzy's irrationality sometimes comes in handy when Dr. Splitz is hesitant. They also actually go back and forth between acting like one person with two personalities and interacting with one another. A "What Do They Fear?" Episode reveals that the split personality manifested in response to the loneliness he felt when he was caged in a zoo.
  Dr. Splitz: Uh, don't you have anything to add, Splitzy?
  Splitzy: I ain't talkin' to you!
• In the Classic Disney Short "Motor Mania", Goofy plays an average suburbanite who is a different person behind the wheel.
• Futurama:
  • Parodied in the Soap Within a Show All My Circuits in "Beast With A Billion Backs," as Calculon discovers he has a fourth split personality. And that it's having an affair with Monique behind his main personality's back.
  • In the episode "Insane in the Mainframe," Fry encounters a robot Abraham Lincoln in the robot asylum. The problem isn't that he thinks he's Lincoln (he's supposed to do that), but that he has multiple personalities, all of which are Lincoln.
    Robot Lincoln: I was born in 200 log cabins.
• Coldstone in Gargoyles as it is made of parts from three gargoyles and their souls are trapped inside him, he has three personalities, two good and one evil.
• Flippy from Happy Tree Friends has post traumatic stress disorder combined with multiple personality disorder. His normal self is calm, happy, polite, and friendly, while his other self is a blood-thirsty psychopath that murders every living creature around in the most horrifying ways possible, whose affinity for violence and sheer hatred of all things living is arguably on par with Lucy.
• Looney Tunes: Played with in the Daffy Duck cartoon "The Prize Pest." Daffy is Porky's prize in a radio contest. He claims to be schizophrenic—loving and placid when he's treated nice, but mean and monstrous if he's treated wrong. Daffy is actually yanking Porky's chain with the latter id, to which Porky eventually wises up.
• Lampshaded/played with in The Mask episode... Split Personality. The character is already two personas in one, but subverts the trope as the second personality can only come out when Stanley puts on the mask and changes. However, in this episode, the mask itself is split down the middle, and Stanley puts on one half. The results were... interesting, with half of his body changed into The Mask and the other half left alone. Both characters were sharing one body at the same time. This leads to some very interesting circumstances as Stanley has to try to hide this while half his body is changed. The other half of the mask? It gets worn by Stanley's old high school bully, who ends up with a psychotic murderous half that even manages to freak out the normal side. Stanley and The Mask are pretty much two different people with Stanley being shy and a bit of a doormat while The Mask is wacky and a fun loving superhero but they do share the same things in common such as both of them being nice,friendly and kind towards people they meet and also caring about their friends as well and the last thing is also that they both have good hearts and they will never hurt anyone or even think about killing anyone and both of them are pretty much harmless.
• Dr. Rockso, the Rock n' Roll Clown (he does cocaine) in Metalocalypse. Dr. Rockso is the dominant personality, but amicable troublemaker Leonard Rockstein briefly succeeded in suppressing him just long enough to make his return all the more surprising.
• Monster High media has an explicit Jekyll and Hyde scenario with Jackson Jekyll and Holt Hyde, the fourth generation grandson of the original. Powerless Jackson is considered to be the "normie" half (and is subsequently bullied for it) and Holt is the monster half, seeing as Holt has blue skin and a fire motif (which he apparently got from their monster father, a fire elemental). Holt’s consciousness is triggered when Jackson hears loud music with a heavy beat (a 4/4 above 90+ decibels) and Jackson is triggered whenever Holt isn’t listening to music. One of them is always "asleep" when the other one is awake, although it’s implied they can retain each other’s memories subconsciously. Apparently they weren’t aware of the other’s existence until Frankie informed them (bear in mind that they’re teenagers), and neither boys were too thrilled. Since then though, they’ve been writing letters to one another and have worked out a schedule, and while they still have their differences, they seem to be getting along better.
• OK K.O.! Let's Be Heroes:
  • K.O. has a split personality in the form of T.K.O., the manifestation of his pent-up anger. For the most part, they reluctantly co-exist.
  • Professor Venomous also has one in the form of Shadowy Figure, the manifestation of all his insecurities regarding his lack of powers. Unlike K.O. and T.K.O., Venomous is (initially) unaware that he exists.
• Pet Alien:
  • "Mr. Jekyll and Mr. Swanky" has Swanky consuming a potato chip and becoming an obnoxiously peppy Cloudcuckoolander who loves eating potato chips. He reverts back after being tricked into eating caviar.
  • "The Night My Brain Froze" has Dinko randomly switching between different personalities after getting Brain Freeze, such as a monkey, an old man, a baby, a butler and a pirate. He reverts back to normal after Tommy warms up his brain again.
• Pixel Pinkie adopts a different personality depending on the faceplate installed on Nina's phone. The normal pink faceplate gives Pinkie her default Genki Girl personality, a grey faceplate makes her an Emotionless Girl, a camo faceplate gives her The Squadette attitude, while a flower-themed faceplate makes her as much as of a New-Age Retro Hippie as Nina's parents.
• South Park:
  • In the earlier seasons, Mr Garrison's hand puppet Mr Hat was his other personality and imaginary friend that helped him to deal with sexual trauma^note specifically, it traumatized him that his father didn't sexually abuse him and gay thoughts. Said in "World Wide Recorder Concert":
    Mr Mackey: Mr Garrison, are you alright?
    Mr Hat: Mr. Garrison isn't here right now...
    Mr Mackey: Mkay, Mr Garrison, you're just having a hard time dealing with the memories of your father's sexual abuse, so you've switched personalities to Mr Hat.
    Mr Hat: Ooh, good one Sherlock, you figured out all that by yourself?
  • Parodied in the episode "City Sushi" where Dr. Janus diagnoses Butters with multiple personality disorder, identifying Postman Butters, Fireman Butters, Big Rig Butters, Inspector Butters, Porn Star Butters, and Professor Chaos. Meanwhile, Janus in fact does have other personalities. Janus has four personalities in total: himself; Billy, a young boy; a violent, unnamed criminal; and Lu Kim, the owner of City Wok, who pulls a full Split-Personality Takeover by the end.
• Total Drama Revenge of the Island's cast features Mike, who is labeled "The Multiple Personality Disorder", who has four alternate personalities (with a hidden fifth one in All Stars). As of the All Stars finale, Mike cured himself, erasing Mal from existence and gaining the abilities of the others. They have their own names:
  • Grumpy Old Man (Chester), triggered by frustration;
  • Foreign Exchange Student and gymnast from Russia (Svetlana), triggered by situations requiring athleticism;
  • Jerkass from Joisey (Vito), triggered by his shirt being removed;
  • Awesome Aussie (Manitoba Smith), triggered by putting on a fedora;
  • The Dreaded Token Evil Teammate (Mal a.k.a. The Malevolent One), triggered by getting hit on the head or once in a blue moon. Literally.
• Blitzwing of Transformers: Animated, with a face to go with each personality. Blitzwing's weaponry and vehicle modes seem to be tied into his personality. The calm face uses some sort of ice missile and a jet form, while the angry face uses a flamethrower and tank form and the crazy face seems to be able to use both - but is not as skilled with either. Prowl actually caught on to this during a battle, and used Bumblebee to annoy Blitzwing so much that he switched from calm/jet to angry/tank — and promptly fell out of the sky. Word of God gives the personalities the names of Icy, Hothead, and Random respectively. Blitzwing's personalities technically aren't different people; they're just immediate shifts between certain states. As seen in the falling tank incident, he'll often swap depending on his mood/the situation — you'll never see Icy get angry or Hothead act happy. Though there is the infrequent time that the three states interact with each other as if they were separate people. They once even debated over a vehicle mode choice:
  Icy: I will choose this fighter jet.
  Hothead: No! The assault tank!
  Icy: Jet.
  Hothead: Tank!
  Icy: Ze Jet.
  Hothead: Tank!
  Icy: Jet.
  Hothead: Tank!
  Random: Ooh-ooh! Why not scan both?