A very elite Suna Anbu infiltrated Kirigakure and found his target. He had skills in fuinjutsu after training with some people who had come from Uzushiokagure, though that place had been destroyed by that time. Once the Suna-nin found who he was looking for, he eliminated the two parents of the target. Then, using Fuinjutsu, he had put the Shukaku inside of Kanshi. It was all a S-Rank Mission, meant to destroy Kirigakure with the tailed beast. However, when the Anbu began leaving very discreetly, Kiri Hunter-nin had found him and killed the Anbu. The mission ended up a secret, even from some Jonin of the Mist.
Kanshi, the target, was already going to end up hated, due to his Kekkei Genkai. Now, that he had become a Jinchuriki, it had made matters worst. A very cold friend of Kanshi's father had ended up becoming his Guardian. The man was a Hunter-nin, but he was forced to make time for his adopted son. The Guardian was a big fan of Yagura's reign, and thus passed on the love for the Bloody Mist to Kanshi. This was further supported by the fact that the Jinchuriki of Shukaku will usually have blood-lust.
The young child himself ended up being a secret, but after learning more and more about his village, he had begun to admire it greatly. Sometimes he had ended up spending countless nights awake learning more about Kirigakure, this was helped by the insomnia caused by Shukaku. He was very excited to serve Kiri as a shinobi, but afterwards his innocence began to fade. Kanshi had grown more and more cold, like his Guardian, and his first C-Rank mission turned into a B-Rank one.
He had encountered an ambush of Chunin, and that was when he awakened his Jinchuriki powers, though he had learned about them before. After a wave of sand hurt the Chunin greatly, his Fire affinity began showing. He touched the sand and it had turned into glass, due to it being ignited by a great wave of Fire chakra. He used it to kill the Chunin.
Fast-forward to now, Kanshi had become a very faithful loyalist to Kiri, though he did not like the end of the Bloody Mist era. However, he had respected the new Mizukage, at least a bit, for being a powerful Kiri-nin. And his love for homicide had grown since his first "C-Rank" mission. He had lost a bit of his sanity as well, but not too much that he's too crazy. He's not one to make friends, though he does respect the idea of having allies. He has also been practicing his Glass Style, though he has to use his Sand Gourd and Junchiriki powers often to become more effective and efficient with it. Kanshi has also grown better at using his affinity for regular elemental jutsu. Oh, and last thing, his dream is to become Mizukage to make the Bloody Mist come back.