what if I had multiple personalities theme

also known as: what if I had a split personality

We are made to imagine what it would be like to have more than one personality in our head, presumably vying for control.

Notes

This theme is typically used in fantastical scenarios where the clinical condition of multiple personality (aka. dissociative identity) disorder is not sincerely featured but distinct personalities nevertheless inhabit the same body. As a rule of thumb, it is used when at least one of the personalities at least some of the time is aware of its own condition of having multiple personalities.

Examples

Norman Osborn struggled with his deranged alter ago the Green Goblin in "Spider-Man" (2002).

15 total · 2 choice · 13 major

StoryLevelMotivation
tftc1989e6x04 choice Nelson, a meek computer nerd, had an alter ego, Eddie, that was assertive and flamboyant. At the end of the story, the Eddie-persona defenestrated the Nelson-persona in a melee, and their life and fortunes changed accordingly: Nelson-cum-Eddie became a superstar at the office.
voy5x07 choice Seven began to take on the personalities of the people assimilated by a Borg cube.
bbf5x13 major Harris had something akin to a split personality.
movie: Dr. Jekyll and Mr. Hyde (1920 I) major Henry Jekyll has two selves: his philanthropist good self and his evil split personality Edward Hyde.
movie: Dr. Jekyll and Mr. Hyde (1920 II) major Henry Jekyll has two selves: his philanthropist good self and his evil split personality Edward Hyde.
movie: Dr. Jekyll and Mr. Hyde (1941) major Dr. Jekyll has two selves: his good self and his evil split personality Edward Hyde. Dr. Jekyll discussed with his colleagues how people had both good and evil inside them and that he could separate the two from one another.
movie: Minor Premise (2020) major The premise of the story is that the brilliant neuroscientist Ethan inadvertently splits himself up into ten personas: nine different alter egos along with his original self.
movie: Nutty Professor II: The Klumps (2000) major The personality of Sherman Klump's vanquished alter ego, Buddy Love, was still ingrained inside him and causes him to act out in the same crass manner Buddy does. Buddy Love was later accidentally incarnated after Sherman removed the "Buddy Love gene" from his person.
movie: SpiderMan (2002) major Norman Osborn had the evil alter ago the Green Goblin.
movie: The Nutty Professor (1963) major Nerdy professor Julius Kelp invented a serum that turned him into Buddy Love: a handsome, suave, charming and brash girl-chasing hipster.