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 is actually fairly softhearted. He has a tendency to get attached to others easily, and hates to see people get hurt, especially his close friends, or those he loves. Aki was seen to despise Devils equally, not caring if they are Hybrids, Fiends or if they are evil by nature, to him all Devils are the same. But, maybe that can change?