Sekiren

As a contract employee for Astral, this character is a profound expert in Buddhism, deeply versed in Vajrayana and skilled in employing Mudra and Shingon mantras, possessing martial arts genius and mastery over concealed weaponry that surpasses other notable figures. Serving as the chief priest of Ryuuren Temple, he occasionally wanders the world before returning to the Astral office. He was instrumental in creating Itsuki's eye patch and later taught him martial arts after a significant event, eventually leaving Astral for Italy upon the Association's request.