 A graduate of the Imperial Britannia Central University's Faculty of Law, Diethard is a former producer and member of the press staff at Hi-TV, a Britannian television station.Following the appearance of Zero and the announcement of his goals, Diethard joins the Black Knights, wishing to witness and document Zero's campaign to overthrow Britannia.He harbors contempt for the Britannian Imperial Family and its supporters, on occasion commenting to Rakshata Chawla that "Britannia is a finished product" and that he would rather take part in creating something new.