The Curse of the Uchiha’s: Uchiha Obito
During the Third Shinobi War, while working on a mission, Rin was captured. Kakashi being the one in charge opted not to rescue her, but to continue on with the mission. (Insert link to character of the week: Hatake Kakashi here) Obito became angry, insulted Kakashi, and left to save Rin. However, Obito was discovered and was saved from death by Kakashi, who had a change of heart after Obito had insulted him. Unfortunately during both rescues, Kakashi lost an eye and Obito became trapped under a rock. Between those events Obito awoke his Sharingan. Being trapped under a rock and Kakashi missing an eye, Obito gave him one of his. Rin and Kakashi were unable to save Obito, and had to abandon him.
However, Obito did not die in the cave; Madara found and rescued him, but did not reveal his identity. Madara also tended his wounds and replaced what couldn’t be healed. After a long while of inactivity and resting, Obito was informed of Kakshi and Rin being in grave danger. He left Madara, not intending to return. Obito arrived in time to see Kakashi kill Rin. This action caused both Obito and Kakashi’s Sharingans to transform into Mangyekos. After leaving, Obito returned to Madara, and ultimately accepted his Eye of the Moon plan, still unaware that it was Madara he was associating with.
Regarding the betrayals of awakening, it was not a betrayal that awoke Obito’s Sharingan, but a strong desire to help a teammate. However, it was a betrayal that brought about Obito’s Mangyeko. This came from Kakashi killing Rin. Kakashi, having one of Obito’s eyes, received the Mangyeko at the same time. There were many important betrayals in Obito’s life, but the last, most important, the truth about Rin’s death, drove him into a war within himself, ultimately returning him to his original path. In the end he died saving Kakashi as he did when they were younger.
Following is a list of his skills:
Chakra Receiver Manifestation
Chakra Transfer Technique
Demonic Statue Chains
Earth Release: Hiding Like A Mole Technique
Fire Release: Blast Wave Wild Dance
Fire Release: Great Fireball Technique
Fire Release: Phoenix Sage Fire Technique
Six Paths Sage Technique