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!!Dr. Henry Jekyll

A scientist with an upstanding reputation in the community, who nonetheless is beset by evil urges which he cannot act out.

* DeadManWriting: In his last letter to Utterson, Jekyll writes that he will soon transform permanently into Hyde, who will then commit suicide.
* JekyllAndHyde: [[TropeNamer Named the Trope]] when he came up with a potion that was supposed to split a man's good side and their evil side.
* {{Hypocrite}}: Jekyll refuses to take responsibility for Hyde's actions, and yet the reason he takes the potion was to [[ForTheEvulz enjoy committing evil acts as Hyde]]. He even says that the reason why his evil side took over when he drank the potion was because he had created it and was drinking it for an evil reason (he muses that had he done it with good intent, he would have turned into someone completely good). The author (in a letter to a friend) called this Jekyll's FatalFlaw.
%%* MadScientist
* ProfessorGuineaPig: He is the first person to drink the potion he makes.
* SplitPersonalityTakeover: After taking the potion too much, he starts spontaneously transforming into Hyde.
%%* TragicHero

!! Mr. Edward Hyde

* AxCrazy: Beats Danvers Carew to death for a small slight.
* DrivenToSuicide: Takes cyanide rather than be exposed to Utterson.
* ForTheEvulz: The reason he does anything, and arguably the reason for his existence.
* WouldHurtAChild: He has no problem trampling an innocent little girl just for pure fun.

!!Dr. Hastie Lanyon

* DeadManWriting: When he [[TheReveal reveals]] that Jekyll and Hyde were one and the same.
* GoMadFromTheRevelation: [[spoiler:When he finds out that Hyde is Jekyll.]]

!!Gabriel John Utterson

* AmateurSleuth: His function in the original story.
* DemotedToExtra: In most adaptations