Aki generally appears to be a very stoic person. He acts mature and sometimes blunt to the point of rudeness when with his fellow Devil Hunters, but he’s actually fairly softhearted. He has a tendency to get attached to others easily, and hated to see people get hurt, especially his close friends. He still grieves for those lost and has not become jaded enough to close his feelings off. You just managed to save his life, but at what cost? He can’t help but blame himself.