Third Mizukage

The was the leader of Kirigakure.

Background
Before becoming the Third Mizukage, he accompanied the First Mizukage to the first ever Five Kage Summit. There he stood behind the First watching diligently as the proceedings unfolded.

Appearance
He was a tall man with long, black hair which was long enough to reach his back with what appears to be pearl-shaped objects forming a circlular pattern in his hair. He wore the standard Kirigakure attire complete with pinstriped arm and leg-guards over which he wore a sleeveless haori with ragged ends. He also wore a poncho-like scarf around his neck. At the time of his death, he had aged considerably, with notable creases and visible frown lines around his mouth, and much lighter hair.

Infinite Tsukuyomi Arc
Subsequent to Kaguya Ōtsutsuki being sealed by Naruto Uzumaki and Sasuke Uchiha, he and the other deceased Kage were summoned from the Pure Land by Hagoromo Ōtsutsuki to aid him and the Hokage in summoning Team 7, the tailed beasts and Madara Uchiha's discarded corpse from Kaguya's dimension.

Trivia

 * The Third Mizukage was the only bodyguard present at the first Kage Summit that did not later become the second Kage of his respective village.