Gengetsu Hōzuki

He was the of Kirigakure.

Background
During his lifetime he seemingly had a great rivalry with the Second Tsuchikage, Mū. Eventually both men ended up killing each other during battle.

Appearance
The Second Mizukage was a fairly tall and thin man. He has relatively long lick colored hair that he wears in a combed back style. He also has a small, thin, dark colored goatee and mustache. He wears a long sleeved, high collared pin-stripped light colored suit common in Kirigakure, a dark colored suit underneath and a dark sash around his waist.

Abilities
Though so far he has not been seen in combat, the fact that he was able to kill Mū, who the Shinobi Alliance fear and no one but Ōnoki can stop (albeit also dying with Mū in the same battle), suggests his combat capabilities are truly fearsome.

Shinobi World War Arc
Mū, as a former Kage, is resurrected alongside various other notable shinobi by Kabuto Yakushi, in preparation for the Fourth Great Shinobi War. He, the Third Raikage, and the Fourth Kazekage are sent to provide backup for the Second Tsuchikage in fighting the Fourth Division. Although he wants to try and kill the Tsuchikage again, he is forced to join the others in battle.