Sasuke was driven by a strong desire for revenge against his older brother, Itachi Uchiha, who had killed their entire clan, the Uchiha clan, leaving Sasuke as the sole survivor. Sasuke was characterized by a sense of aloofness and a solitary nature. He was often quiet and reserved, keeping his emotions to himself. His primary goal was to become stronger, both in terms of physical prowess and mastering powerful ninja techniques, so that he could eventually confront and defeat Itachi.