Mizunoe

is a former member of Konohagakure's Anbu faction Root.

Background
To prevent Hiruzen from being reinstated as Hokage, Danzō gave Mizunoe and nine other Root members a mission to assassinate him. Disguised as a foreign shinobi, he fought the Anbu accompanying his target, who turned out to be a disguised Kakashi, resulting for the mission's failure.

Personality
Mizunoe was extremely loyal to Danzō and would do whatever he asked of him, no matter what it may be.

Appearance
Mizunoe is a very tall shinobi, one of the tallest under Danzō's command at the time he was active, with buzz-cut black hair. He wears a standard Anbu attire, an his mask has yellow markings.

Abilities
As an Anbu, Mizunoe is presumably a powerful shinobi. He wields a sword as his primary means of attack.

Trivia

 * is the ninth sign of the Chinese calendar.
 * Mizunoe's name was only divulged in a Studio Pierrot Settei of Root members.