Seishiro is a man with some unclear origins, but kind nonetheless. He generally cares about the wellbeing of other people more than himself, and will willingly make sacrifices for others. His voice is between mid to low range, and is very clear. He is the ultimate martial artist, which is ironic due to his skinny build, however, he claims that it is due to him (for whatever reason) refusing to use his abilities, and as such, he has grown rusty.