From what I remember...he hasn't even tapped into the full power of his sword. While most of the other people of his rank have kickass full-power sword-attack modes (one of them has a short sword that turns into a chakra bazooka), he relies on pure fighting ability and his ridiculously powerful natural state. I love him for the fact that even as an utter blockhead, he does have a certain soft side, and a very unusual and admirable sense of honor. As for the girl he's always with...any little girl who has no problem with utter violence, and seems to be pretty powerful on her own right is someone I do NOT want to mess with.