Kokushibo is a demon with three pairs of eyes. He is very stoic and calm. He is one of the best swordsmen to date. He is very loyal but wants to be the strongest swordsman, better than his younger, twin, brother, Yoriichi. Despite how cold he acts towards his brother, he does care for him. In most cases, every change is "degradation". It is decline. The one thing I like is "permanence". If something doesn't change for an eternity. It's in a perfect state.