Basic Trope: A character has a good and bad personality in them.
- Straight: Jason drinks a potion that transforms him into a monster named Johnny. Johnny and Jason periodically switch forms.
- Exaggerated:
- Jason is The Cape who transforms into Johnny, who is a horrible scumbag.
- Jason is Incorruptible Pure Pureness, While Johnny is a Complete Monster.
- Main Character Final Boss
- Downplayed:
- Jason is smart but serious, while Johnny is outgoing but emotional.
- Jason is a Nice Guy and Johnny is a Jerkass.
- "Johnny" isn't necessarily a distinct entity, but the repressed emotional state of Jason.
- Justified: There is a stimulant in the potion which drives Jason into an unstoppable rage.
- Inverted: Johnny drinks a potion that transforms him into a human named Jason.
- Subverted:
- Jason drinks the potion and finds that the stimulant doesn't effect him.
- Jason drinks a potion that reveals a violent and resentful Split Personality in him known as "Johnny"... or so he leads people to believe. The potion was a dud, and "Johnny" is just an excuse for Jason, a Manipulative Bastard, to kill people when he needs to without losing empathy from anyone else.
- Jason drinks a mysterious potion, and suddenly becomes a lot crueler and more cynical until morning arrives. Turns out that "potion" was beer.
- Double Subverted: The potion has no effect on Jason... until it has totally absorbed into his blood.
- Parodied:
- Upon even smelling the fumes of the potion, Johnny goes on a violent killing rampage.
- The Hyde personality is a different sex. This is never explained.
- The "Hyde" personality is a comically over-the-top Card-Carrying Villain who does nothing but Poke the Poodle.
- Zig Zagged: ???
- Averted: Jason does not become Johnny.
- Enforced: ???
- Lampshaded: "Did Jason seem a little....completely opposite to you?"
- Invoked: Jason drinks the potion knowing full well it would turn him into Johnny.
- Exploited: ???
- Defied: Either Jason refuses to drink any concoctions that will turn him into Johnny or Jason turns into Johnny permanently.
- Discussed: ???
- Conversed: ???
- Deconstructed: Jason believes that, because Johnny is a supposedly distinct entity acting out, this absolves him of any responsibility since he can't remember what occurs in the Johnny state. This doesn't hold up to the public, and so Johnny is punished along with Jason.
- Reconstructed: Both the public and Jason himself are made aware of his condition, so measures are taken to ensure that Johnny's destructive potential is reduced.
- Played For Laughs: Frank wants to protect Jason from Johnny, the monster. And both hide in odd places where inexplicably Jason disappears, and Johnny appears.
- Played For Drama: Jason keeps convincing himself that he needs Johnny's strength or determination to overcome so challenge in his life, but each time he drinks the potion he loses control and there is a corpse in front of him when the potion wears off.
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