Killer B

is a ninja from Kumogakure and the Jinchuriki of the Eight-Tailed Beast. He is a black, musclebound Cloud shinobi, who appears to dislike light. On his right shoulder, he has a tattoo that says "iron"; and on his left cheek, he has a tattoo of a bull's horn. He also carries seven swords.

Personality
It also seems that he hates being called the host for the Eight-Tailed Beast, and prefers to be referred as "me and that thing." He also appears willing to speak in song, even when confronted with potential threats.

Hunt for the Eight Tails
Team Hawk, after discovering that the Eight Tails was training in the Unroikyo Mountains traveled up the mountain. Kira Hachi revealed himself after appearing to contain his tailed beast. When Suigetsu attacked him, Kira Hachi easily overpowered him, and used his sword to defeat Jugo afterwards.

Abilities
Kira Hachi apppears to be able to control the power of his Tailed beast with great ease, similar to his fellow Cloud shinobi, Yugito Nii.