Iwao Kuroiwa (黒磐 巌, Kuroiwa Iwao) is a Special Class Ghoul Investigator and an Investigation Commander in Division I. He served as the Vice Commander of the 11th Ward Special Countermeasures Unit, and Vice Commander of Squad 1 during the Owl Suppression Operation. He was seriously wounded during the battle, losing his left arm below the elbow. Even so, he has managed to continue serving as an Investigator and is greatly admired for his charisma. His son, Takeomi Kuroiwa, is also a Ghoul Investigator serving in the 1st Ward. Yukinori Shinohara calls him by the nickname Iwaccho.