Itachi Uchiha

"It is not the one who becomes Hokage who is recognized. It is the one who is recognized by everyone who becomes Hokage."
Itachi to Naruto.

Itachi Uchiha was a prodigy of the Uchiha clan of Konohagakure. He became an international criminal after murdering his entire clan, sparing only the life of his younger brother, Sasuke. He joined the criminal organization Akatsuki, where he came into frequent conflict with Konoha and its ninja, including Sasuke, who sought to avenge his family. After dying during a battle with Sasuke, Itachi's motivations were revealed to be more complicated than they seemed, as his clan was plotting a coup d'état against Konoha that would bring war to the village. Ultimately, Itachi wanted to protect his village and his brother, remaining a shinobi loyal to Konohagakure until the end.

From an early age, Itachi was calm and perceptive. He lived from a distance, observing individuals and ideas without getting directly involved so that he could fully understand them. While this approach prevented him from becoming close to others, it allowed him to think and act without prejudice or preconceptions, instead evaluating things strictly on their own merits. He came to think about the shinobi, the origins of the village, and its future. For this reason, he never had the self-righteous loyalty to his clan that was so common among the Uchiha; although he loved his family and wanted the best for them, he knew that there were more important things than the aspirations of the Uchiha.

Itachi shaking and crying as he is about to kill his parents.

Despite being a pacifist by nature, Itachi felt that his own needs were secondary to the greater good, and to that end, he became a shinobi. He trained tirelessly to improve himself as quickly as he could, and submitted to all the inconveniences of shinobi life without complaint, for the simple motivation of being of service to others. Being an extremely skilled ninja, Itachi could approach problems with less violence than others would, indulging his peaceful nature. These two extremes of his personality came into conflict when events led him to the Uchiha Clan Massacre; he did not want to harm his family and sought a peaceful solution, but knew that the path with the least bloodshed would be the extermination of the clan. As the inevitability of the massacre became more apparent, Itachi's normally polite attitude towards his clan became more violent, openly criticizing them and attacking the choices that sealed the fate of his clan and his own.