Kou is cheerful, direct and tends to jump into things headfirst without properly thinking them through. However, he has been shown to grow more mature as the series progresses. He is often misjudged as a bit of a delinquent or rude, but this is actually not the case. Kou is a tall teenage boy with short, spiky dirty blond hair, light blue eyes, and two protruding canine teeth. His delinquent-like personality and aura make him relatively unpopular.