18. Theon Greyjoy
Prince of all families, master of none. Raised as a foster-son-slash-hostage by Ned Stark, the once-swaggering heir to the Iron Islands built up a lifetime of resentment. He betrayed his foster brother Robb and seized Winterfell for his own – until all sides abandoned him and he wound up at the tender mercies of the Bastard of Bolton. His transformation into the traumatized "Reek," and his redemption by helping Sansa Stark escape from their tormenter Ramsay, made for one of the show's most unexpected and satisfying storylines. Now he rides with the Mother of Dragons.