Kou is a young exorcist from the Minamoto clan, easily recognized by his spiky blond hair and his signature traffic-safety-charm earring. He has a boisterous, competitive, and somewhat impulsive personality, often shouting when he gets excited. Despite his brash exterior, Kou possesses a strong sense of justice and a genuinely kind heart, always looking out for his friends. He's fiercely loyal, though he can be a bit dense at times.