Yagura Karatachi

Little is known about this Jinchūriki yet. They hailed from Kirigakure and was the host of the Three-Tailed Giant Turtle. However, when Deidara and Tobi fought the Three-Tails, Deidara claimed the beast was weak because it had no host. This might possibly be because this Jinchūriki died. Because of the varying masculine and feminine features of this Jinchūriki, their gender is unknown.

Speculation
It is suggested that this shinobi is a relative of Suigetsu Hozuki and Yūkimaru, as they all have similar appearances. Also, it's been said that Yūkimaru can control the Three-Tails. It's also likely that they may appear in the current Three-Tails Arrival filler arc. It was also speculated that, judging from the weapon on their back, that the Jinchūriki is Mangetsu Hozuki, and that they died when the beast was extracted.