Kumogakure's Eight-Tails Jinchuriki could fully control the Eight-Tails. He had dark skin and pale yellow hair, wore black sunglasses, and carried seven swords and the great sword Samehada. He had the character for "iron" on his right shoulder and bull-horn markings on his left cheek.
The Fourth Raikage's partner and sworn younger brother, he later taught the Nine-Tails Jinchuriki, Naruto Uzumaki, how to control a tailed beast, and fought side by side with Naruto during the Fourth Shinobi World War.
He spoke in a rapping cadence most of the time. Although his personality seemed eccentric, he also showed a calm, cautious side in battle.
He usually enjoyed holding concerts and having his students sell tickets, but often his students were the only ones who attended.
Killer B of the Eight-Tails learned the skill of Tailed Beast Transformation after gaining control of his tailed beast. This was also why Tailed Beast Transformation possessed such terrifying power on the battlefield.
Tailed Beast Transformation: primarily drawing on tailed beast chakra, this referred to a state in which the body underwent no obvious changes, but tailed beast chakra surfaced around it, equivalent to an initial Tailed Beast Cloak. (The more tails the Tailed Beast Cloak had, the greater the power released.)
At this stage, the ninja still retained his own consciousness, but his emotions were affected by the tailed beast chakra, making him irritable and aggressive.
The Eight-Tails Jinchuriki, Killer B, used the Head Eight Swords when fighting Kisame Hoshigaki. In this state, all of a ninja's abilities increased.
At the same time, the tailed beast chakra rapidly healed the ninja's wounds, leaving almost no scars and providing tremendous combat capability.
Partial Tailed Beast Transformation: at this stage, the Jinchūriki's body underwent obvious changes but retained a humanoid form, accompanied by a conspicuous outpouring