Kotaro

Kotaro, known as Bossie or Bossy in the dub, in the bull used by Ushinosuke Oshamanbe during his fight in Hell Canyon against Ryoga. Kotaro is easily recognised by the Eyepatch he wears over his right eye.

Anime Biography
Kotaro appeared along with Ushinosuke Oshamanbe in Hell Canyon after Ushinosuke had kidnapped Anna and challenged Ryoga for her freedom. During the fight when Ushinosuke had managed to catch Ryoga in his chain, he jumped on the back of Kotaro. Kotaro was then used to help drag Ryoga along the floor, at high speed, in an attempt to force Ryoga to surrender. However, Ryoga began running on his hands behind Kotaro and Ushinosuke, after Ushinosuke gets kicked into the wall of the Canyon Kotaro continues running. It is unknown what happened to Kotaro after this point but it is possible that he ended up back at the ranch he came from.

Abilities
Very little is known about what abilities Kotaro possesses. He is show to have great speed, as well as considerable strength as he was able to carry Ushinosuke Oshamanbe and drag Ryoga simultaneously (as well the chain that Ryoga was tied to).