Mizukage

The is the leader of Kirigakure. As the official head shinobi of the Hidden Mist Village, his word holds sway over all political and militaristic issues that present themselves regarding Kirigakure and its villagers. Madara Uchiha would later be revealed to Kisame Hoshigaki as a Mizukage.

First Mizukage

 * Age: Unknown (Deceased)
 * Rank: Mizukage
 * Height: Unknown
 * Weight: Unknown
 * Birthday: Unknown
 * Blood Type: Unknown

The First Mizukage was probably the founder or one of the founders of Kirigakure..

Second Mizukage

 * Age: Unknown (Deceased)
 * Rank: Mizukage
 * Height: Unknown
 * Weight: Unknown
 * Birthday: Unknown
 * Blood Type: Unknown

Nothing is known about this Mizukage, except that he was the village leader after the First Mizukage.

Third Mizukage
The Third Mizukage was the village leader when the Kaguya clan attacked Kirigakure. When a group of sword-using shinobi slaughtered the entire clan (except for Kimimaro). The Third Mizukage was so impressed that he named this group the Seven Swordsmen of the Mist.
 * Name Unknown
 * Age: Unknown
 * Rank: Mizukage
 * Height: Unknown
 * Weight: Unknown
 * Birthday: Unknown
 * Blood Type: Unknown

Fourth Mizukage

 * Name Madara Uchiha
 * Age: Unknown
 * Rank: Mizukage
 * Height: Unknown
 * Weight: Unknown
 * Birthday: Unknown
 * Blood Type: O

It has been recently revealed that at some point prior to becoming Tobi, Madara Uchiha took the role of Mizukage. Which Mizukage however, has not been made clear. Speculation, however, suggests that he was Mizukage after the Seven Swordsmen of the Mist were formed. Zabuza Momochi did a coup d'état on the 4th Mizukage but, it failed. It is unknown why