Obito Uchiha

Obito Uchiha  was a member of Konohagakure's Uchiha clan. He was believed to have died during the Third Shinobi World War, his only surviving legacy being the Sharingan he gave to his team-mate, Kakashi Hatake. In truth, Obito was saved from death and trained by Madara Uchiha, but the events of the war left Obito disillusioned with the world, and he sought to replace it with a new one. Using the aliases of Tobi and Madara Uchiha, Obito manipulated Akatsuki from the shadows to further his plans, eventually going public with them and in the process starting the Fourth Shinobi World War. He had a change of heart towards the war's conclusion, however, and ended up sacrificing his life to save the very world he sought to replace.