Four Tails, the King of Sage Monkeys

After killing White Zetsu with his Eternal Mangekyo Sharingan's Susano'o, Sasuke Uchiha sets off to destroy Konoha. Back at the battlefield, as Kakashi and Guy learn that Tobi is using a large amount of chakra to assert full control over the Tailed Beasts, they hear the voice of the Five Tails as Tobi subjugates the creature. Voicing his disdain for humans' treatment of them, the Nine Tails recaps his own subjugation under Madara and then by the Uzumaki Clan from Hashirama's wife Mito to Naruto's mother Kushina. After Roshi fully transforms into the Four Tails, he swallows Naruto. The Four Tails meets Naruto and insists that he be called by his actual name: Son Goku. After a brief discussion about the humans' treatment of the Tailed Beasts, during which Naruto learns the Nine-Tailed Fox's true name is Kurama, Son sees Naruto to be an exception. Wanting to know if Naruto's desire to aid him and the other Tailed Beasts would not waver, Son asks the youth to free him from his chains.