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犀犬 Saiken

  • Six-Tails (六尾, Rokubi)
Manga Volume #60, Chapter #567
Anime Naruto Shippūden Episode #151
Movie The Last: Naruto the Movie
Game Naruto Shippūden: Ultimate Ninja Storm 3
Appears in Anime, Manga, Game, Movie
Voice Actors
Species Slug
Nature Type
Unique Traits

Saiken (犀犬, Saiken), more commonly known as the Six-Tails (六尾, Rokubi), is a tailed beast sealed within Utakata of Kirigakure. It has been captured by Nagato in the anime, then extracted and sealed by Akatsuki. It was later resealed into a reincarnated Utakata during the Fourth Shinobi World War.[2]


File:Young Biju.png

Saiken first came into being in the waning days of the Sage of the Six Paths, who used his Creation of All Things ability to separate the Ten-Tails' chakra from its body and divide it into nine separate constructs that would come to be known as tailed beasts in order to ensure that it would never resurface after his death.[3][4] 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 and forms than they did. Then, when the time came, they would know what true power is.[5]

Saiken eventually fell into the possession of Kirigakure and was sealed into Utakata. In the anime, it was revealed that at some point before his appearance, Utakata's master, Harusame, tried and failed to remove Saiken from within Utakata, intending to save his student from being a living weapon for his village. Utakata, however, having not heard what his master had said to him, later came under the assumption after the incident that his master had tried to kill him. This failed removal resulted in Utakata transforming into Saiken and killing Harusame.


Though much has not been seen of Saiken's personality, the giant slug uses 'ore' (オレ) when referring to itself, 'ore' being a boastful way of saying 'I'. It also speaks with a dialect which may possibly be Ōsakaben in origin. In the anime, Saiken also seemed to be kinder and not as self-serving and malicious as most other tailed beasts, as when Utakata asked for its help to save Hotaru it seemed to willingly comply; and later it simply receded back into Utakata without trying to take him over.


Young Saiken

A young Saiken.

Saiken resembles a large white, with a slight light blueish tint, bipedal slug with stubby arms and feet. It has two prominent optical tentacles (eyes) and hole-like openings as a mouth. Its entire body is covered in a slimy substance. During the last remaining days of the Sage of the Six Paths, Saiken was much smaller than its present-day self, but was still much larger than the Sage.[5]


Acid Spray

Saiken using Acid Scattering.

See also: Jinchūriki Forms As a tailed beast, Saiken has a great amount of chakra and it is able to use it to create a Tailed Beast Ball. Saiken is able to emit corrosive substances that are extremely dangerous on contact in the form of a liquid or a gas, which was able to burn the skin of another tailed beast, such as Gyūki. The gaseous form was able to instantly disintegrate a tree that came into contact with it.[6]

Part II

Tsuchigumo Kinjutsu Arc

Main article: Tsuchigumo Kinjutsu Arc

File:Saiken Tsuchigumo Arc.jpg

In the anime, in an attempt to stop the Fury technique from causing untold destruction, Utakata goes into his full Six-Tails form to shield the blast. Ultimately Utakata is captured by Nagato and the Six-Tails was extracted from his body, being sealed into the Demonic Statue of the Outer Path.

Shinobi World War Arc

File:Six Tails Unleashed.png

After Utakata's full transformation into Six-Tails, he attacks Kakashi and Guy, emitting a corrosive alkali from its mouth, which Kakashi warns Guy not to touch. After Guy dissipates the gas with his Morning Peacock technique, the Six-Tails prepares to attack him again. After Son Gokū is resealed into the Demonic Statue of the Outer Path, Tobi, who is intent on going all-out from this point on, forces remaining jinchūriki to transform into their respective tailed beasts.[7]

File:Naruto and Biju.jpg

Preparing to attack the shinobi, Saiken along with the other four beasts create Tailed Beast Balls. These attacks however, are deflected by Naruto and they are rebuffed by a now fully-transformed Naruto. Wasting no time in their attacks, Saiken attempts to incapacitate Kurama by swallowing its arm rendering it immobile. The beast is however swung into Matatabi, sending them both flying away. With this, the opposing beasts prepare a collaborative Tailed Beast Ball which is met by one from Naruto and Kurama. As Naruto enters a deeper plain of the tailed beasts' consciousness, Saiken introduces itself to the young man. Later as the beast is freed from the chakra receiver it affirms Kurama's belief that Naruto was the person the Sage of the Six Paths had spoken about so long ago before being resealed into the Demonic Statue of the Outer Path.

Ten-Tails Revival Arc

Saiken appeared alongside with the other tailed beasts with the exception of Gyūki when the Ten-Tails looked down at Naruto. The image of the tailed beasts, along with a a silhouette of the Sage of the Six Paths, drove the Ten-Tails to a fit as it evolved further.

Video Games

Although Saiken itself is not playable, Utakata takes on its form as his awakening in Naruto Shippūden: Ultimate Ninja Storm 3.


  • 'Saiken' (犀犬) literally means 'rhinoceros dog', apparently a kind of Chinese yōkai.


  1. Fourth Databook, pages 148-151
  2. Naruto chapter 565, page 1
  3. Naruto chapter 467, pages 15-16
  4. Naruto chapter 510, pages 11-12
  5. 5.0 5.1 Naruto chapter 572, pages 10-11
  6. Naruto chapter 566, page 10
  7. Naruto chapter 570, pages 8-9

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