Yagura Karatachi

was the jinchūriki of the Three-Tails and the of Kirigakure. When the Three-Tails was captured by Akatsuki, it had no host and roamed out in the wild.

Background
During his time as Mizukage, the village was known as the, mostly because of the barbaric ritual where Academy students kill one another in order to graduate. This practice was discontinued when an entire graduating batch of Academy students were massacred by a young Zabuza Momochi. It is likely that Yagura was the Mizukage whom Zabuza tried to assassinate when he revolted.

Yagura was also known to dispatch Kiri-nin who were suspected of being disloyal to the village immediately (commending and taking Kisame Hoshigaki as his direct subordinate after assassinating Fuguki Suikazan, a traitorous member of the Seven Ninja Swordsmen of the Mist). Yet despite the terror of his reign, he appeared to be kind. Apparently the people of Kiri feared that Yagura was being manipulated, a fear which was confirmed by Ao, who saw through an unnamed genjutsu with his Byakugan, later identified by Kisame as the work of Tobi.

Appearance
Yagura has messy grey hair (brown in the anime), pink pupiless eyes and what seems to be a stitch-like scar running from under his left eye, all the way down his cheek. He wears a grey, sleeveless shirt with the Kirigakure forehead protector attached to the front, short-sleeved mesh armour over which he also wears a green poncho along with a turquoise sash around his waist, paired with a green apron over his pants. He wears a pair of brown boots, and on his back he carries a staff-like pole weapon with uneven sized hooks with a green flower on the larger end.

Abilities
Not much is known about his abilities except that he was presumed to be a powerful shinobi, due to him being chosen as the Mizukage. He wields what appears to be a large staff, with a hook at either end, one larger than the other, along with a green flower on the larger end. By incorporating this tool into his Water Release ninjutsu, Yagura is able to create mirrors that can reflect enemy attacks.

Jinchūriki Transformations
As the Three-Tails' jinchūriki, Yagura is granted a significant amount of chakra and stamina from the beast. He was also one of the few people mentioned by Danzō Shimura to have achieved full control over their respective beast. However, he has yet to display anything more than a partial transformation into the Three-Tails, being able to manifest one of its tails.

Shinobi World War Arc
In preparation for the Fourth Shinobi World War, Yagura is resurrected by Kabuto Yakushi to fight against the Allied Shinobi Forces, before being mobilised alongside the other deceased jinchūriki.

As dawn breaks on the second day, it is revealed that Tobi had turned the revived jinchūriki into his own customised Six Paths of Pain, with each having a Rinnegan and Sharingan in place of their left and right eyes respectively. Each jinchūriki also had their particular tailed beast resealed within them and a chakra receiver embedded into their body. Yagura is later seen travelling together with Tobi, in pursuit of Naruto and Killer B. Encountering their targets, the revived jinchūriki were sent into battle. After the enemy evades Rōshi's attack, Yagura uses his Water Release: Water Mirror Technique to counter their attacks, repelling them momentarily. However, when this initial assault fails, he, like the others, unleashes the power of their respective tailed beast by materialising the first of its tails.

Trivia

 * The word means "tower" or "turret". It could also refer to the tombs in the middle ages.