Yugai is a ninpō, a Kunoichi. Not much is known about her. She first appeared in episode eight of the 2001 Shaman King anime. She reappeared differently in episode 46. In the first episode, she tries to kill Yoh, and her second appearance Ren.
Oversoul and Attacks
Attacks Yugai make duplicates of herself. She can team up with her duplicates to attack the opponent.
Yugai is a 2001 anime-only character and as such does not appear in the manga series.