7. Tywin Lannister
There's an argument to be made for the idea that Tywin Lannister is directly responsible for most of the misery and suffering that goes on in "Game of Thrones."
If he were a little nicer to his children as they were growing up, maybe we wouldn't have constant civil war and throne-usurping distracting everyone from the threat of the White Walkers. He may be well-mannered, but he's as dark and twisted as anyone in this series. Fitting he got crossbow'd by his own son while atop a toilet.