Hello everyone. Im Phillip. Im a 16 year old Korean. That is all.
When first introduced during his assignment to Team 7, Sasuke displays a great brooding skepticism to his teammates. Feeling that his abilities are far superior to their own, he is unwilling to cooperate with Naruto Uzumaki or Sakura Haruno, as doing so would apparently do nothing to help him kill Itachi. These perceptions are quickly proven wrong, for despite their failings, Sakura is a useful spout of information; while competition with Naruto acts as an effective way to get stronger. While he retains a conceited arrogance in himself throughout the series, Sasuke increasingly relies on his team over the course of Part I. As he starts to get close to others he also begins to risk his own life to try to save them, even though his death would leave him unable to fulfill his goal of vengeance upon Itachi.
Although Sasuke becomes content with a life of happiness in Konohagakure, he never allows his ambition to gain power to leave his thoughts, always keeping them as a dark muttering. During his Part I battles with characters such as Haku and Gaara, Sasuke arrogantly tests his abilities against those of progressively stronger ninja, in the process discovering the weakpoints he needs to overcome. While initially complacent with his development, Naruto quickly starts to compete to grow stronger at a faster rate. This, coupled with his humiliating and effortless defeat by Itachi during a brief return to Konoha, leads Sasuke to believe that his growth is too slow. In an attempt to reassess his strength, he begins to treat his friends as opponents so as to test his abilities against their own.
Dissatisfied with his progress and growth while in Konoha, he betrays Konoha in order to accept the offer of tutelage from Orochimaru at the end of Part I.  Naruto attempts to stop him, but Sasuke, believing the death of Naruto, his closest friend, will give him the power he desires (as he was told by Itachi), tries to kill him instead. He is ultimately unable to follow through with this idea, because he felt rage from doing things like his brother, Itachi, and instead shamelessly continues on to Orochimaru. In the two-and-a-half years he spends with Orochimaru, Sasuke's goal to kill Itachi takes precedence above all else; he even claims he is willing to give his body and soul to Orochimaru if it means killing Itachi, but later turns on Orochimaru after reaching the conclusion that he can learn nothing else of value. After achieving his goal of bringing about Itachi's death, in the process learning how his brother was ordered by Konoha's higher ups to perform the murder of his clan, Sasuke abandons all of his hate for Itachi and resolves to kill Konoha's higher ups for his blind revenge, to the point he is willing to kill anybody who may stop him.