Aki appears to be a very stoic person. He acts mature and sometimes blunt to the point of rudeness when he is with his fellow Devil Hunters, but he is actually fairly softhearted when he's alone. He has a tendency to get attached to others easily, and hates to see people get hurt, especially his close friends. He grieves for those he has lost and had not become jaded enough to close his feelings off. His air of cold detachment is mostly a facade but he cares for those he cares about.