Ao

is a shinobi of Kirigakure. Ao is a middle aged gentleman with an eyepatch over his right eye; he also wears two talismans on his ears.

Personality
Ao seems to be a stereotypical man, believing that men should be tough and decisive; fussing at Chōjūrō for not being strong enough because of his pessimistic and weak demeanour.

Five Kage Summit arc
He was setting off with Chōjūrō to escort the Mizukage to the Five Kage meeting, called for by the Raikage.