Коемма

King Enma Jr., usually addressed as Koenma, is the son of Enma, the ruler of the spirit realm, and the one responsible for appointing Yusuke Urameshi as spirit detective. Koenma first appears as a toddler, which he is often teased about, though he is at least 700 years old and has extensive knowledge of the universe. Koenma is a basic comic relief character and is often shown as cowardly. However, if Yusuke or any of the others are in immediate danger, he will help all he can. He comes off as a good leader and a nice guy for the most part.

His job in Spirit World is to decide who goes to Heaven, and who goes to Hell. Some think this should be his father's job, but King Enma is too busy on business trips most of the time. Also, he has a Jr. sign on his forehead, and still has his pacifier, which has been carried in his mouth for most of his existence, storing up his spirit energy. When the power is unleashed, it creates the Mafukkan, Spirit World's most powerful defensive spell.