It’s an actor's responsibility to bring a character to life - to become that character. To eat, sleep, speak, and interact as that character. This is especially true of Game of Thrones' ensemble cast of unique and multifaceted characters. Because each character has intricate histories and detailed backgrounds, casting directors are tasked with pouring over thousands of hopefuls to find each role's perfect fit. While capturing the character's aesthetic and interpersonal dynamics is no easy task, looking back at their Game of Thrones auditions, it's pretty clear how natural of a fit some of the actors were for their iconic roles.