Eight Tailed Giant Ox
Names: Eight-Tails, Hachibi.
Creature Type: An Ox and an Octopus.
Host: Kira Hachi(Killer Bee)
Unique Traits: Can produce Ink.
Status: Active, sealed in host.
The Eight-Tails once y fell into the possession of the Hidden Cloud village. However, its ferocity was so great, none of its former jinchūriki could control it. They would lose control and the Eight-Tails would go on a rampage and destroy the village, requiring the Third Raikage to form a special coalition to subdue it, extract it from its previous jinchūriki, and sealed it within a special pot. Many villagers lost their lives during these episodes and the Eight-Tails lost one of its four horns to A after the said horn pierced Motoi's father. It was ultimately sealed within Killer Bee, who was five at the time, through the Iron Armor Seal. Bee would go on to tame and control the Eight-Tails through rigorous training within the Falls of Truth.
The Eight-Tails resembles an ushi-oni with four long horns on its head, similar to that of a Jacob sheep. It also has a fifth horn like protrusion on its chin, which appears to have been damaged, much like its upper left horn, part of which was sliced off in battle by A. It has a muscular upper-body structure, with a hunched back similar to an American bison, arms with spiked protrusions on the elbows, and hands with opposable thumbs like that of a human. It has no hind-legs. Its tails consist of eight tentacles that resemble the cephalopod arms of an octopus, and according to Killer Bee, its tails will grow back in the event that they are sliced off. It is also extremely massive, large enough to stand equal in size with one of the mountains in the Valley of Clouds and Lightning.
Killer Bee and the Eight-Tails appear to be able to speak to each other in a much more relaxed state than Naruto Uzumaki and the Nine-Tailed Demon Fox. For example, when Naruto has a conversation with the Nine-Tails, the latter is in a cage with a special seal keeping it from taking over Naruto. As Killer Bee is one of the few people who has total control over his own tailed beast, he and the Eight-Tails can talk without such restraints, with Killer Bee even sitting on top of its muzzle. The Eight-Tails is shown to get easily annoyed with Killer Bee's crazy antics; however, that is only shown to be comical. Before Bee learned to control it, the Eight-Tails was infamous to be wild, violent, and went on many rampages when its former jinchūriki would lose control over it.
Despite the Eight-Tails' friendly relationship with Killer Bee, the Eight-Tails' main goal, like the other beasts, is self preservation. For example, it was more than willing to be released and destroy Kisame Hoshigaki despite Sabu and Ponta being close by. However, behind the brutal appearance, the Eight-Tails is shown to have a good analytical ability, as it told Killer Bee that if he left Ponta and Sabu and run in the opposite direction Kisame and the water will follow him and they (Sabu and Ponta) will be free. The Eight-Tails mentioned that it used to be much more aggressive and violent but that Killer Bee changed it. It also said that it doesn't like the Nine-Tails but insisted that it was no reason for Bee to refuse helping Naruto take control over it, hinting a benevolent side.
With its great supply of chakra, the Eight-Tails can fire massive chakra blasts. During Naruto's battle with the Nine-Tails within his subconscious, it was shown that the Eight-Tails had enough strength to temporarily restrain and contain a direct blast from the Nine-Tails. However, despite its immense size, it does not withstand the secondary effects of powerful attacks just as much as the Nine-Tails can, as Sasuke Uchiha's Chidori Sharp Spear and Amaterasu techniques proved effective against it. In continuation with its octopus theme, it can use ink.