Sora

Sora is a monk in the Naruto Series.

Background
Not much is known about his childhood, only that one day he went berserk and wrecked the Temple of Fire, a place otherwise believed to be an undestructable fortress. Afterwards, he was loathed by some of the monks of the temple, and soon began receiving the same treatment as a Jinchuriki. He wanted to become part of the Twelve Ninja Guardians. He hates himself because of his powers and gets angry when people stare at him. When they first meet he hates Naruto but then they become friends. Sora does not like getting help from people, especially ninja. He did not even want Team Yamato to come.

Filler Arc
Earlier in the arc, Sora fought Naruto Uzumaki because he thought Naruto was robbing a ninja's secret tomb. It turns out that Naruto is quite jealous of him and thinks that he doesn't need Sora's help. Later, when Naruto's chakra was being drained it appeared that when all of Naruto's chakra was gone and the demon fox started getting pulled that the demon fox himself called to Sora for help or warned him that Naruto was in danger. In episode 63 it is revealed the Kazuma of the twelve ninja gaurdians was Sora's father. Kazuma was killed by Asuma Sarutobi.

Abilities
Sora is a wind natured chakra user like Naruto. He has special powers with wind. Sora is a monk in training who fought Naruto because he thought Naruto was robbing a ninja's secret tomb. His jutsu are wind release killer slash. Like Asuma Sarutobi, he has a special wind style weapon called the death claw. He works very hard in his training and he uses special Taijutsu arts only known to monks. His wind will cut anything, even chakra. In episode 64-65, during a flashback (presunmably when he destroyed the Fire Temple), he was shown surrounded by Red Chakra, meaning that Sora might have some connection to the Nine-Tailed Demon Fox.
 * Element: Wind

Trivia

 * Sora is introduced as the first filler character in Naruto: Shippūden thus doesn't make an appearance in the manga.