Entei Hokai-o is a Jonin of the Hidden Leaf Village, as well as the Clan leader of the Hokai-o Clan. He specializes in the use of Flame Release, an Advanced Fire Nature created by himself, as well as being very proficient in Taijutsu. He, along with his two siblings, Shunshin Hokai-o and Akasume Hokai-o are the sole surviving members of the Hokai-o clan after the Kyuubi attack.