Bansai

Bansai was an elder monk in the Temple of Fire. It is unknown if he was a ninja.

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

Hidan and Kakuzu arc
When Chiriku was killed at the Temple of Fire, Sarutobi Asuma 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.