6. Sandor Clegane, "The Hound"
The younger brother of Gregor Clegane and a member of House Clegane (which is sworn to House Lannister) is a very dark man. After his brother shoved his head into a pile of hot coals, he was literally and figuratively scarred for life. He's the definition of big and scary and he will kill whatever and whoever he wants, whenever he feels like it. Usually though, it's for the better. His most bad ass moment on the show so far? Disemboweling a man who was trying to rape Sansa.