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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, which he considers his real death.
* FatalFlaw: Pride, he separated his evil from his good because he couldn't stand the idea that he wasn't completely good, he even comments that the reason he is so much more handsome than Hyde is that he worked years to keep himself like a good hearted person so his good side isn't that different than what he is. Hyde gave him a side that could experience all the evil intent he repressed and some more while he as Jekyll would remain an upstanding citizen without flaw.
* 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: One of the codifiers of this archetype in classic literature despite not being mad in the psychiatric sense. He does toy with the lines of human nature and the results of his research and his experimenting are less than positive.
* 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 without having to drink the potion.
* TragicHero: He was a nice and decent man but his repressed anger and inability to accept any flaws in him (most of his friends brings up some misbehavior but nothing outside youth's mistakes) pushed him to make a potion so he can live his evil as a different person.

!! Mr. Edward Hyde

* AxCrazy: Beats Danvers Carew to death for a small slight.
* BigBad: Jekyll's evil given form.
* EvilFeelsGood: He is essentially the conduit for Jekyll's repressed feelings of aggression, and, boy, does he ever enjoy fulfilling that role.
* DrivenToSuicide: Takes cyanide rather than be exposed to Utterson.
* ForTheEvulz: The reason he does anything, and arguably the reason for his existence.
* MadeOfEvil: He is the personification of everything bad in a human being (mostly untamed aggressiveness) and people reacts toward him with complete disgust and hatred due to how pure his evil is.
* TheyLookJustLikeEveryoneElse: While there's ''something'' unsettling about him, he's pretty normal in terms of appearance aside being rather short.
* 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