This Naruto papercraft is the Eight-Tails (Hachibi), the cube craft paper toy is designed by blackignus. Gyūki, more commonly known as the Eight-Tails (Hachibi), is a tailed beast sealed within Killer B of Kumogakure after his cousin, cousin's uncle and cousin's father failed before him.
Gyūki came into being in the waning days of the Sage of the Six Paths' life; to prevent the Ten-Tails' resurgence, the Sage split up its chakra and used his Creation of All Things ability to create nine separate, monstrous constructs of living chakra, which would become known as the tailed beasts.Some time after being created, the Sage sat down with all the young tailed beasts and told them that they would always be together even when separated, and that one day they would become one entity again with different names as well as forms than they did then when the time came for them to understand what true power was. Gyūki eventually fell into the possession of Kumogakure.
However, its ferocity was so great that none of its former jinchūriki could control it. They would lose control, and Gyūki would go on a rampage and destroy the village, requiring the Third Raikage to form a special coalition to subdue it. During one of its rampages, the Third fought Gyūki alone allowing his comrades to escape. During this encounter the Third managed to cut all of the beast's tails off, but both him and Gyūki collapsed with their techniques before they could finish the battle. During another encounter the Third extracted it from its previous jinchūriki, and sealed it within the Kohaku no Jōhei. Many villagers lost their lives during these episodes and Gyūki lost one of its four horns to A after the said horn pierced Motoi's father. It was ultimately sealed within Killer B, who was five at the time, through the Iron Armour Seal. B would go on to tame and control Gyūki through rigorous training within the Falls of Truth.
At some point in the past, one Kumo-nin attempted to mimic the Gold and Silver Brothers by eating one of Gyūki's chakra meat tentacles in the hopes of gaining the power like a jinchūriki, but died in the process.
Gyūki is an ushi-oni with four long horns on its head, similar to that of a Jacob sheep. The lower left part of its horns was permanently sliced off in a battle with 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, instead its lower half is made up of its tails which consist of eight tentacles that resemble the cephalopod arms of an octopus. These tails will grow back in the event that they are sliced off. It is also extremely massive, matching the Giant Squid in size. During the last remaining days of the Sage of the Six Paths, Gyūki was smaller and its horns were much shorter.
Since Killer B is one of the few jinchūriki to gain control over his tailed beast, his relationship with Gyūki is very relaxed. B and Gyūki talk leisurely, with B even sitting on its nose. However, B tends to annoy Gyūki to comical effect; his serious and no-nonsense demeanour often contrasts with B's tendency to goof off whenever he likes, adding fuel to Gyūki's irritation to its vessel. Gyūki is not above bad-mouthing B as a result. Gyūki is also known to scold him in serious occasions as shown when it criticised B for rapping in his fight with Kisame when he should have been completely focused on their opponent. Because of this, Gyūki appears to be much more noteworthy than B as far as responsibility is concerned. Before B learned to control it, Gyūki was infamous to be wild, and violent. It also went on many rampages whenever its former jinchūriki would lose control of it. Gyūki uses 'ore' when referring to itself and often speaks in a somewhat rude dialect.
Gyūki is also shown to have a good analytical ability, as it told Killer B that if he left Ponta and Sabu and run in the opposite direction Kisame and the water will follow him and they would be freed. Gyūki mentioned that it used to be much more aggressive and violent but that Killer B changed it. It also said that it doesn't like Kurama, but insisted that was no reason for B to refuse to help Naruto take control of the beast, hinting a benevolent side. Since then, both the beast and B have taken a liking to Naruto. Gyūki also tends to reprimand B. This is usually shown in a comical manner as when it bumped B in the head when the latter started to mention in a perverted matter how Yugito's chakra receivers were embedded in her left breast.
With regards to its relationship with the other tailed beasts, Gyūki maintaining that they had their own emotions and personalities has expressed dislike of Kurama's habit of ranking their strength based on their number of tails and has also stated that seeing another beast being forcefully controlled angered the rest of them greatly.
Gyūki was said by both Kisame and Kurama to be the second strongest of the tailed beasts. With its great supply of chakra, it can fire massive chakra blasts. Despite their massive size, its horns are incredibly sharp, coupled with Gyūki's massive physical strength, it is able to easily impale a human being. During Naruto's battle with Kurama within his subconscious, it was shown that Gyūki had enough strength to temporarily restrain and contain a direct Tailed Beast Ball from Kurama, but was knocked out of the battle afterwards because of it. Its strength is so great that it could stop Isobu in full motion using only its extended tentacles, along with swiping Kokuō aside at the same time.It was able to endure being burned by Amaterasu for a considerable amount of time, and continued battling after being gored by Kokuō and slammed by Son Gokū. Its tentacles offer it several additional appendages with which to interact with its surroundings and strike targets, but they are also easily severed. Even with its immense size, it has shown a high level of speed when it attacks, and even fast enough to block Amaterasu with its fist. A single Tailed Beast Ball from it could penetrate nine of the thirty-six barriers without even exploding. Going with its octopus theme, it can also produce ink to blind opponents as well as form ink clones to bind the enemies. It can also generate enormous tornadoes which can destroy an entire forest with ease.
Gyūki has been shown to be very intelligent, explaining the mechanics of the Tailed Beast Ball to Naruto, the weaknesses of his Nine-Tails Chakra Mode, as well as pointing out that until he and Kurama reach a formal agreement, Naruto will not be able to fully transform or perform the Tailed Beast Ball. Gyūki even coached B in tactics on how to counter Kisame's water-based techniques. He is also very perceptive as he later worked out that the Gold and Silver Brothers were revived, after witnessing Naruto sense Kurama's chakra coming from outside of the training place that he and B were confined, correctly deducing that Orochimaru's Impure World Resurrection was being used by someone participating in the war.
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