Xaro Xhoan Daxos
The smoothest man that ever was or will be? This megarich merchant from the splendid oasis city of Qarth bears basically zero resemblance to the character of the same name from the books, but when you're confident enough in your own wealth, charm, and intelligence to dupe a queen into trusting you with three flying weapons of mass destruction, you can do what you want. (Except buy better guards for your bedroom, I guess.) It's been a great pleasure listening to Nonso Anozie's mellifluous purr, too.