Jukei is the Hokuto Ryken master who trained the three Rash 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 Ryuken. He then trained Kaioh and Hyoh sealing Hyohs memories of Kenshiro and his knowledge of the original Hokuto style. In the present he forms part of Leias resistance and attempts to undo the seal but gets killed in the process. Source: Wikipedia