Bijuu are demons that exist in the world of Naruto, they are also known in as demons in Japanese mythology. There are nine in total. Each one has an incredible amount of chakra within them, to try and combat these powerful beasts and stop the destruction they cause they were captured and sealed inside new born babies using a powerful technique that would kill the person using it. The Fourth Hokage was one of those people who sacrificed their life to seal a Bijuu and protect the world from chaos. When the human has a demon sealed inside them they are known as Jinchuriki. Every demon has a different amount of tails, ranging from one tail to nine.
Three-Tailed Giant Turtle - Sanbi no Kyodaigame, takes the form of a three-tailed turtle. This demon was previously sealed within Yagura.
Four-Tailed Monkey - Yonbi no Saru, takes the form of a four-tailed gorilla. This demon is sealed within Rōshi.
Five-Tailed Dolphin Horse - Gobi no Irukauma, takes the form of a five-tailed dolphin-horse. This demon is sealed within Han.
Seven-Tailed Horned Beetle - Nanabi no Kabutomushi, takes the form of a seven-tailed beetle. This demon is sealed within Fū.
Eight-Tailed Giant Ox - Hachibi no Kyogyu, takes the form of a eight-tailed ushi-oni-like beast. This demon is sealed within Killer Bee.
Nine-Tailed Demon Fox - Kyuubi no Yoko, takes the form of a fox. This demon is sealed within Uzumaki Naruto who has incredible stamina and can summon large amounts of the Kyuubi's chakra. However Naruto has not yet learned how to fully control the awesome power of Kyuubi. Other translations include: Kyuubi, Nine Tailed Demon Fox, Kitsune.
