Bansai

was an elder monk in the Fire Temple. It is unknown if he was a shinobi.

Twelve Ninja Guardians Return arc
Not following the manga, Bansai debuted in this arc. When Naruto and his team arrived at the Fire Temple, Yamato introduced him to the old man.

Hidan and Kakuzu arc
When Chiriku was killed at the Fire Temple, Asuma Sarutobi and his team went there to gather information on Akatsuki. Bansai said a prayer for Asuma, who got in trance and saw the spirit of his dead comrade Chiriku.

Source

 * Third Databook, page 189