Ryun Mazuka (リュンマズカ, Mazuka Ryun) is the title character, and main protagonist of all of Ten Tailed Fox's stories. He is a Missing-nin from Yamagakure. He also is a former member of the Fourth Relief Platoon and a current member of Koukon. Due to his reputation as a war hero in early battles in the Fifth Great Shinobi War, he is called Yamamori (山守, Guardian of a Mountain) by those who knew him. It is later revealed that he is the jinchuriki of the Four-Tailed Monkey, who's chakra mixes well with his cousin's chakra.