Hiyosu

As the department head of the Research Institute's 12th division, this imposing figure played a pivotal role in uncovering the secret behind Rukia Kuchiki's unique ability. He was instrumental in the institute's discovery of the unfolding situation when Yammy and Ulquiorra initiated their small incursion into Karakura Town. His distinctive appearance, featuring a large build and an extendable eye mechanism, marks him as a key figure in the unfolding supernatural events.