"The Mizuumi stand ready to serve, as ever, Mizukage." - Iwao Mizuumi. Iwao Mizuumi (巌湖, Japanese for "Stone Man Lake") is the current head of the Mizuumi Clan that lives in Kirigakure. He fought in the Fourth Great Shinobi World War as a member of the Third Division. His skill with Water Release techniques has granted him some fame across the Five Great Shinobi Countries, as well as his trademark usage of the Hidden Mist Technique, which is the basis for his nickname; Misty Iwao. He is the grandfather of Ai Mizuumi.