Son of King Yama, ruler of the Spirit World, Koenma is left in charge of day to day operatioans while his father is away on vacation. Koenma's youthful appearance is quite deceiving - the little prince is actually over 700 years old! Koenma possesses the wisdom to accompany his years, and can pose a rather commanding figure in spite of his diminutive size. There's only one thing that koenma fears - making his father angry!