Mizukage

The is the Kage of Kirigakure, a title bestowed on the village's leader. The Mizukage position is filled by the strongest person in the village, regardless of considerations such as age. The Mizukage's building is the largest landmark in Kirigakure, bearing the kanji for on it.

Fourth Mizukage
He was manipulated by Tobi, who could be called the "real" Fourth Mizukage.