Yinzhe "Intetsu"

About

He is the Demon Master of Mount Ura and the spirit shadow of a former Youmeshi.

Initially, he antagonizes You Keika, trying to make him usurp his position. But after his powers awaken, he deems himself no match to Keika and leaves him alone, though after making Keika promise to protect Ki.
He is also bound to the Mount Ura, and cannot leave its boundaries.