Garaa
Garaa was a lonely child when he grew up he was the son of the kazekage but everyone hated him for the demon Shukaku that lived inside of him they all thought he would kill them. His mother died, when he was born, from childbirth so he was only loved by his uncle. Soon a group of ninja came to kill Garaa but Garaa was able to defend himself but among the group of ninja was his uncle, he had betrayed Garaa. He told him that he had always hated Garaa and that his father sent him to kill him. Then his uncle died by blowing himself up in an attempt to kill Garaa, but it failed. Now Garaa felt completely alone in the world no one loved him and the one person who did tried to kill him. Soon he became a genin and then joined the leaf village at their (I don't remember which test) forest of death. He was able to conquer his opponents and beat it. A few weeks later or so he took part in the Chunin exams where he had to fight Rock Lee he won when Rock Lee's mentor stopped the fight. His next match was against Sasuke Uchiha who was unable to defeat him but Naruto showed up and Garaa went Shukaku while trying to kill him Naruto ended up beating him.