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Hiyosu (鵯州)Department head in the Research Institute tied to the 12th division.
He is a large man with a bulbous head and an extendable eyeball via a crank on his head. He was the one that originally discovered Rukia Kuchiki's unusual gigai. He was also present when the Research Institute discovered that Yammy and Ulquiorra had begun a small invasion on Karakura Town.