Saiyume Yu

Background
His parents died after his home village, Garasugakure (Village Hidden by Glass [not a real village]) was attacked by the ten-tailed demon, the Osagisaku. Afterwards, he and his younger brother Saiyume Dosu tried to survive, but they were separated and lost. From that moment on, he spent his life searching for his younger brother. After an unsuccessful 12 years, he finally gave up and joined the Akatsuki, which he thought was a good thing at the time. But after finding his brother while on a mission, and discovering that Dosu was a jinchuriki, he quit the Akatsuki (somehow), and started trying to prove himself worthy to become a Taki shinobi.

Part 1
Yu is present in part 1 from the time he joined the Akatsuki, to the time he started trying to prove himself to the Takigakure leader.

Part 2
Having finally proven himself to Takigakure, Yu is now a full-fledged Taki shinobi. At the rank of Anbu, Yu is now a member of the Takigakure Anbu ops. He is determined to maintain a position of importance, and will do anything to stop his village from destruction, even at the cost of his life.

Part 1
When Yu shows up, he is assumed to be some random evil Akatsuki by Chihiru. However, Yu becomes known as a person who is dedicated and kind, although a bit of a klutz sometimes.

Part 2
Yu has made it his life's goal to do anything, no matter what the cost, to protect the ones who finnaly accept him. He says that "every person in Taki is like family to him. They're depending on him, and he just can't let them down."

Jutsu Style
Yu has the same currently unknown (by you guys anyway ^^) chakra nature as Dosu. His jutsu range isn't extremely wide, although he specializes in Saiyume Style Taijutsu and Ninjutsu.

* more to be added later*