Mizunoe

is a 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 in the mission's failure.

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 a presumably a powerful shinobi. He wields a sword.

Trivia

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