Akaboshi

Akaboshi is ninja who aims the learn the Tsuchigumo clan's forbidden jutsu.

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