Killer B's Jinchūriki Forms

Kira Hachi is a Jinchūriki of the Eight-Tailed Beast, and is therefore cabable of transforming into various forms that more and more begins to resemble his Tailed Beast, until he finally takes on the completete form of his Eight-Tailed Beast. So far, he has only displayed two forms. Unlike Naruto and Gaara he seems to have full control of his Tailed Beast and his transformations.

Three-Tailed Transformation
When need be, Kira Hachi will tap into the Eight-Tailed Beast’s chakra and generate a demon cloak similar in appearance to Naruto’s One-Tailed Transformation (and onwards).

In this form will his incisors grow long and sharp and Kira Hachi is covered in a boiling chakra shield, that takes the shape of his tailed beast by forming three tentacle-like tails on his behind, and paws of chakra around his hand. However, instead of just creating ears like the demon fox's cloak, his chakra cloak has formed what appear to be a pair of bull-like horns. Due to Kira Hachi's great control of his Tailed Beast, this transformation can be done instantly.

In this form, he becomes powerful enough to blow away Sasuke's entire neck and chest, but also begins to move in a straight line, something Sasuke noted to be a weakness. However, Kira Hachi simply retorted that Sasuke would not be able to keep up. According to Kira Hachi, only Sasuke and his own brother could match up to his speed.

Full Transformation
While fighting Sasuke Uchiha and his team, Kira Hachi managed to wound Sasuke long enough to transform into a full form.

In this form, he takes on the appearance of the Eight-Tailed Beast itself, rather than just a cloak, appearing like a huge ox with eight octopus-like tentacles as its tails and four horns on his head, though with one of them broken. Like with his previous form, he seems to be in full control of this form, however to what extent is still unknown.