リズヴァーン

A decedent of the Oni tribe, he taught Kurou Yoshitsune swordsmanship.
One of the Hachiyou that protects the Priestess, the Genbu of Earth.
He leaves a silent and somewhat dark impression, but he is a sometimes kind and sometimes strict teacher who quietly watches over the protagonist.
He also teaches her swordsmanship and she calls him Teacher.