Fū's Jinchūriki Forms

Fū is the jinchūriki of Chōmei — the Seven-Tails. Not much is known about Fū or her tailed beast, but in the anime, Deidara indicates that she loathed humanity, due to being neglected and hated by her village because of her status as a jinchūriki. Fū was eventually captured by Akatsuki and her tailed beast extracted, causing her death. However, during the events of the Fourth Shinobi World War, she was reincarnated and made into a jinchūriki once again, yet the Eight-Tails remarked that her tailed beast felt "different".

Version 2
Whilst reincarnated, Fū displayed the ability to enter a "Version 2" form, by moulding Chōmei's chakra into a human-like shape around herself. When entering into this form, the sudden increase in chakra was such that it instantly vaporised Killer B's ink clone, which had immobilised her at the time.

In addition to forming a dark chakra cloak around her entire body, she also gained claws on her hands and the characteristic horn-like protrusion of Chōmei on her head. As this form manifests all of her beast's seven tails, Fū also becomes able to fly, but at much faster speeds than achieved in her other forms. When this capability is used in conjunction with her elongated and sharpened teeth, she can injure her opponent using a simple yet swift bite.

Partial Transformation
After being reincarnated, Fū demonstrated the ability to manifest two of the beast's tails and use them like wings to fly. She has been shown to be very nimble whilst in flight, being capable of outmanoeuvring several of Killer B's attacks using Samehada and his other swords.

Full Seven-Tails Form
During the confrontation to capture Naruto Uzumaki and Killer B, Tobi forcefully transformed the revived Fū into her full Seven-Tails form. In this form, she takes on the appearance of Seven-Tails itself, allowing her to manipulate the full extent of the beast's considerable powers, including its ability to fly. Like most other jinchūriki who can transform into their tailed beasts, Fū is also able to use the Tailed Beast Ball.