Haijō Kobushi (古強者廃城 Kobushi Haijou, lit: Veteran of the Castle) is the current "Number 4" of the Society of Darkness. He is a veteran shinigami and an excessively powerful physical combatant who has abandoned virtually any prowess in Kidō, Zanjutsu or Hohō, utilizing his constant-release zanpakutō abilities and prowess in Hakuda to beat all his foes into submission.