Hamura Ōtsutsuki

He was the brother of Hagoromo Ōtsutsuki and was the jinchūriki of the Shinju.

Background
Kaguya Ōtsutsuki gave birth to two sons, the first humans to be born with chakra. To repent their mother's sins, Hagoromo and his brother fought and defeated the Shinju, what would eventually be known as the Ten-Tails and sealed it away within themselves.

Abilities
Fighting Shinju alongside Hagoromo, it could be implied that he was powerful.