Seitarou Yagiri

Seitarou Yagiri is Namie and Seiji's uncle.

Charateristics
Not as much shown but he wears a lab coat and has brown hair.

Anime
Episode 09: He told Namie that she was allowed to see the head in a flashback. Then he said that she was goign to take over the company one day. Which Namie did.

Adabashi Arc
He demanded Shingen to give Celty's head to him which is revealed in a flashback. Shingen refuses. So Seitarou said that he'll mess with Shinra if Shingen didn't give him the head. Shingen did give him the head. At the end of the novel he is warned to not go near Yadogiri Jinnai.