In "The Cask of Amontillado", can you think of any other villains that share some of Montresor's villainous characteristics?
You know, for some reason, what comes to mind is a series of James Bond villains, who are ferociously intelligent, agile and quick with their brains, but hideously unaware of their motivations and what drives them. For me, the key to Montresor's character is the fact that he is unaware of what drives him - he is an archetypal unreliable narrator in that we come to suspect his words when he talks about his anger and desire for revenge against Fortunato. Thus it would need to be a villain that shows themselves to be exceptionally devious in terms of their planning and quick thinking and use of their enemy's weaknesses against them, but also one that is mentally disturbed or challenged. Any James Bond villain will do - or you might want to think of a Batman villain such as the Joker or someone like that.