People may not agree with me, but Crime and Punishment by Fyodor Dostoevsky is an example of a character slowly going mad. Now I should clarify that I don’t mean literally mad or insane. Like pure psychosis. Which is fine if that’s what your favorite character goes through, but just saying that I’m speaking in more general terms, like losing grasp on reality and becoming more suspicious, paranoid, and preoccupied with thoughts while also developing a sense of alienation. Like the movie Taxi Driver, where you see how the character, who was not really mentally healthy to begin with, is slowly becoming more and more alienated and preoccupied with certain extreme ideas of cleaning the filth and saving the innocent and so on.
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by Fin_al