I respectfully disagree with the latter. He may initially seem nothing like the Jojen of the books, but he has that sorta elven face and I’m-not-entirely-happy-with-my-role-in-this-prophecy demeanor. And while he’s pretty tall, he looks about 120lbs soaking wet and would still need his sister for protection –plus the height will become less apparent as Bran’s (Isaac Hempstead-whatever) puberty runs its course.