The main theme is the duality of human nature. Dr. Jekyll represents the good, civilized side, while Mr. Hyde represents the evil, primal side. It shows how these two aspects can exist within one person.
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Basically, the tale of Jekyll and Hyde centers on Dr. Jekyll's experiments with a concoction that leads to his transformation into the evil Mr. Hyde. It delves into the darker side of human personality and the consequences of unleashing it.
The main themes include duality. We see it in the characters of Jekyll and Hyde, two very different personalities in one body. There's also the theme of secrecy. Jekyll tries to keep Hyde a secret from society. And moral decay is a theme as Hyde engages in immoral acts which shows what can happen when the darker side of human nature is unleashed.
The two main characters are Dr. Henry Jekyll and Mr. Edward Hyde. Jekyll is a respected scientist who creates a potion that transforms him into Hyde, his evil alter - ego.