Sasuke Uchiha is one of the last surviving members of Konohagakure's Uchiha clan. After his older brother, Itachi, slaughtered their clan, Sasuke made it his mission in life to avenge them. He is added to Team 7 upon becoming a ninja and, through competition with his rival and best friend, Naruto Uzumaki, Sasuke starts developing his skills. Dissatisfied with his progress, he defects from Konoha so that he can acquire the strength needed to have his revenge. His years of seeking vengeance become increasingly demanding and irrational and isolates him from others, leading him to become an international criminal. After proving instrumental in ending the Fourth Shinobi World War and being redeemed by Naruto, Sasuke decides to return to Konoha and dedicates his life to helping protect the village and its inhabitants.