Dissatisfied with his progress, he defects from Konoha so that he can acquire the strength needed to exact his revenge. His years of seeking vengeance and his actions that followed become increasingly demanding, irrational and isolates him from others, leading him to be branded as an international criminal along with his new Team Taka.

His only goal in life is to take revenge for his clan's deaths by any means, even if it meant acquiring power that wasn't his own. Sasuke Uchiha from Naruto.