Shūkurō Tsukishima (Achrones150)

is the Third Horseman of the Inner Circle and a former member of the human group XCution. In his conflict with Byakuya Kuchiki, he was slain and passed on to the Soul Society. After wandering the Rukongai, he was eventually found out by Suna Tekketsu out of interest of his abilities. After forcefully re-awakening his abilities, he is introduced into the Inner Circle as an apprentice to Suna.