Sasuke Uchiha(うちはサスケ,,Uchiha Sasuke) is a fictional character in the anime and manga series. In the beginning of the story, he is member of Kakashi Hatake's Team 7, which, at the time of his membership, consists of himself, Naruto Uzumaki, and Sakura Haruno, making him an original member of the Rookie Nine; Sasuke later leaves the team and goes with Orochimaru to get enough power to be able to kill his older brother: Itachi Uchiha.
The early years of Sasuke's childhood were spent living in the shadow of his older brother, Itachi Uchiha, who had proven time and again that he was an extremely talented ninja. Because of Itachi's successes, most of the members of the Uchiha clan looked to Itachi as the clan's future, the biggest proponent of this idea being Sasuke's father, Fugaku Uchiha. Due to this focusing on Itachi, Sasuke did what he could to prove himself to his family, though no amount of training could help him in surpassing the milestones set in place by his brother. Itachi, aware of Sasuke's struggle for recognition, tried to shift some of their father's attention to Sasuke, even offering to train Sasuke in various fields of ninja abilities. Although Itachi succeeded in getting Fugaku to spend more time with Sasuke, much of that time was still dedicated to Itachi, and all the while Itachi never lived up to his promises of training Sasuke. As time went by, Itachi's standing in the clan began to falter as his trustworthiness was constantly called into question. At this time, Itachi also began to create a more competitive relationship with Sasuke, challenging Sasuke to surpass him. Because of Itachi's changing personality, Fugaku began to take a more active interest in Sasuke's development, teaching him the Great Fireball Technique in less time than Itachi had taken to learn it, which also gave Sasuke proper membership into the clan. Most prominently, Fugaku encouraged Sasuke to not follow in Itachi's footsteps, the former prodigy of the clan having lost his father's confidence.
Soon after receiving the attention from his father that he had so yearned for, Sasuke returned home late one evening to find all the members of his clan dead. After finding Itachi standing over the bodies of their parents, indicating he was the one responsible for the clans' murders, Itachi informed Sasuke that he wasn't worth killing. As he left, Itachi repeated his encouragement to Sasuke to get strong enough to surpass him, and disappeared into the night. From that day forth, Sasuke lived as an orphan, longing for the parents that had been taken from him and allowing his brother's words to fester. Soon after the clan's annihilation, Sasuke's only goal in life became to gain power through any means necessary in order to kill Itachi and avenge the clan.
During the start of the series, most of the jutsu of Sasuke were Fire Release techniques and manipulating shuriken techniques, however after being defeated by Rock Lee Sasuke starts copying taijutsu by using his Sharingan and training to increase his speed and strength until having a similar strength of Rock Lee to be able to use the only original jutsu of Kakashi: the Chidori, during Part I Sasuke is only able to perform this jutsu twice in a day (three using the Cursed Seal) and he needs to use his Sharingan to use this jutsu in a fight. During all the series his speed is noted to be very high being able surprise the opponent during a fight. By using the Ten no Juin (Cursed Seal of Heaven) received by Orochimaru all his abilities are drastically enhanced. However, the Cursed Seal tends to drain the chakra of Sasuke and he may lose the control of himself. In the level 2 of the Cursed Seal, his appareance totally changes, turning his skin brown, and growing his back two wings. During Part II, it seems Sasuke does not have problems to use the power of the Cursed Seal and has shown the ability to manipulate the Chidori to create a large group of lightning-based weapons or use it with his chokuto (his sword) to increase the damage and paralyse the opponent. His ability with the Sharingan also has been improved, being able to perform genjutsu like his brother. He also can summon snakes and after absorbing Orochimaru his healing abilities have increased in a similar way to the ability of the Kyubi. During this part, it is mentioned many times that Sasuke has learned a jutsu from Orochimaru that he tries to use against Yamato and Deidara, but he is interrupted or finds an easier way to fight. This unknwon jutsu seems to be his strongest one.