What fictional villain has made an impression on you?

Was this villain from a horror movie, a book, or elsewhere? It doesn’t necessarily have to be a baddie who scared you, just one that made some sort of impression on you that stuck. Maybe this bad guy is the sort of conflicted character with a sad past, or maybe he’s just pure evil, or perhaps it has to do with an unusual description of his looks or behavior.
I’m asking this because I just finished reading the Abarat books by Clive Barker and I can’t get the image of Christopher Carrion and his tank of nightmares out of my mind…in a good way, surprisingly.