Aki generally appeared to be a very stoic person. He acted mature and sometimes blunt to the point of rudeness when he was with his fellow Devil Hunters, but he was actually fairly softhearted. He had a tendency to get attached to others easily, and hated to see people get hurt, especially his close friends. He was, however, entirely willing to put his own life on the line to save other people despite his own fear of death and even at risk to his ultimate goal. Is very responsible and cold.