Fū is a kunoichi from Takigakure and the jinchūriki of Chōmei, the Seven-Tails. When Chōmei was captured and sealed by Akatsuki, causing her death when the beast was extracted, she was reincarnated and Chōmei was resealed within her.
It was thought that Fū despised humanity due to being neglected and hated by her village, as a result of her status as a jinchūriki, but when seen with the other jinchūriki and tailed beasts, she appears cheerful and happy go-lucky. She often uses 'ssu' at the end of her sentences - which is more commonly used by boys, giving her a somewhat tomboyish demeanour.
Fu is to appear as a playable character in the upcoming Naruto Shippūden: Ultimate Ninja Storm 3.