Gyūki


 * Name:
 * Creature Type: Unknown; appears to be a cephalopod
 * Host: An unknown Cloud-nin
 * Unique Traits: Unknown
 * Status: Active, sealed in host

The Eight-Tailed Beast is currently one of the two remaining Tailed Beasts that was not extracted by Akatsuki, while the other one being the Nine-Tailed Demon Fox. The Jinchūriki 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.

Speculation
As most of the other Tailed Beasts seen so far are based upon mythological creatures, it was speculated that the Tailed Beast was based upon the eight-headed and eight-tailed dragon, Yamata no Orochi. But from the shadow when Sasuke goes to retrieve the beast, it seems to be an octopus. Some fans believed that Orochimaru was the Eight-Tailed Beast due to his snake-like abilities, however this was proven false in chapter 408.