Hidetoshi Sekiguchi was John's owner. He arrived in Ohu to kill Akakabuto to avenge his father, who was killed by the bear and quickly became Gohei's hunting rival. However, Hidetoshi also knows medicine and helped Gohei when the latter was ill. Daisuke was faschinated by Hidetoshi and the two develops a bond that is better shown in the mangas. Daisuke wants to learn hunting and Hidetoshi teached him how to hunt with a bow and arrow.

He doesn't play a major role in GNG and does not appear in GDW anime but he does in the manga and also on its sequel, GDW:O with a much bigger role.