Yagura Karatachi

Little is known about this Jinchūriki yet. He 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.

Speculation
It is suggested that this shinobi may be related to Yūkimaru, as they have similar appearances. Also, Yūkimaru can control the Three-Tails. It should be noted that Yūkimaru only appears in the anime. Another speculation is that he is Suigetsu Hōzuki's older brother: Mangetsu Hōzuki. Suigetsu does state that Mangetsu prematurely and in some unknown way.

Trivia
The stripe down the Jinchūriki's left cheek might be connected to the Three-Tails' single open eye.