Gyōkaku Kumoi

Gyōkaku Kumoi (雲井 尭覚, Kumoi Gyōkaku?) introduced during The Captain Amagai arc, is one of the clan leaders serving the Kasumiōji Clan. He appears to be the main antagonist of the arc, apparently replacing Aizen. He is also the steward who handles most of the family affairs. However, when Rurichiyo's father passed away due to illness, he has planned to usurp the head family seat, gathering supporters and creating an assassination squad for his own purposes. He often adopts a smiling and benevolent expression in front of public appearances, which belies his evil and cunning nature. He has his assassins kill off the clan leaders in the noble family who disagree with his views or discover his plans. His main goal is to kill Rurichiyo, the last true descendant of the Kasumiōji family, which he has failed to on several occasions back in Seireitei. He has his assassins pursue her and her bodyguards to the real world, but Ichigo and his friends constantly defeat them. Upon learning of the shinigami invasion of the Kasumiōji compound, Kumoi grows desperate and sends a horde of assassins, all armed with Bakkōtō, after the invading Shinigami. Ichigo, Rukia and Shuu corner Kumoi, who is using Rurichiyo Kasumiōji as a hostage and is killed by Captain Shūsuke Amagai who then teleports to Yamamoto with Rurichiyo, revealing that Amagai was the true mastermind behind The Kasumiōji Crisis and that he wishes to avenge his father's death by defeating his father's killer, General Yamamoto himself.