Katsu resurfaced years later as a Quincy Assassin, apparently successful in his endeavors. Katsu demonstrated that he had developed an intense hatred for Shinigami and the Gotei 13 and was hellbent on bringing about their downfall. From various encounters and eyewitness accounts, Katsu was revealed to be a member of the infamous Seven Fangs, an organization of criminals and murderers who wielded special weapons called Fangs. In this case, Katsu utilized Suijin after having defeated its previous owner in a duel.