Juukei

Juukei is the Hokuto Ryuuken master who trained the three Rashou and Shachi. In the past, he went through a demonic possession as a result of his misuse of his style, killing his wife and child, but was rescued by Ryuuken. He then trained Kaiou and Hyou, sealing Hyou's memories of Kenshirou and his knowledge of the original Hokuto style. In the present, he forms part of Leia's resistance and attempts to undo the seal, but gets killed in the process.

(Source: Wikipedia)