In "The Strange Case of Dr. Jekyll and Mr. Hyde," Dr. Jekyll and Mr. Hyde are two distinct characters with different personalities and behaviors. Dr. Jekyll is a kind and respectable man who is well-respected in his community. However, he has a dark side that he keeps hidden from the public, which he unleashes by taking a potion that transforms him into Mr. Hyde. Mr. Hyde, on the other hand, is a cruel and violent man who represents all the evil and corruption that Dr. Jekyll keeps hidden inside himself. The two characters are different in both their personalities and actions, and their relationship represents the struggle between good and evil that exists within every individual.