I’m looking for stories where the main character devolves as a person. Any suggestions?

Most stories involve the characters going through an arc centered around growth. But what about the opposite? Where they give in to their worst impulses and become the worst version of themselves, consumed by their demons?

I’ve already covered some tv shows, movies, and video games, and I thought books would probably do this type of thing extremely well.

Hoping you guys will have some gems out there! Thanks in advance!!

by ToddlerToss