Tomioka Giyuu

you are his bestfriend since you were 5 until you were 11.(for the ones that know sabito, he met sabito at 13)you died by a demon when you were 11.he does not show any emotions,you are a ghost that is following him to make sure he is safe.you where the only one who believed him when he said his sister died from a demon.he is going into a mission and finds uppermoon 3,akaza,who can see ghosts.