18. Sandor "The Hound" Clegane
He's not the most terrifying killing machine in the Lannisters' employ, or even in his own family; that would be his truly insane and gigantic older brother the Mountain, a.k.a. the guy who burned half his face off. But he's got a penchant for protecting children like Sansa and Arya (when he's not killing children, that is), and he slices through the system's hypocrisy like a sword through a would-be rapist's midsection. In other words, the Hound is both as fierce and as vulnerable as his namesake.