Nangō

Nangō is a ninja who was helping Akaboshi to collect the Tsuchigumo clan's forbidden jutsu. He doesn't talk a lot and is shown to be a keen observer..

Six-Tailed Beast arc
Akaboshi and his group make an on Mount Katsunagi to search for the Tsuchigumo clan's forbidden jutsu. They were able to destroy the barrier within the mountain. They couldn't find the jutsu anywhere and they ran into Tonbei who Akaboshi and his group defeated quickly. They discover that Hotaru Tsuchigumo has the jutsu and they begin searching for her.