Itachi Uchiha (うちはイタチ, Uchiha Itachi) was a prodigy of Konohagakure‘s Uchiha clan. He became an international criminal after murdering his entire clan, sparing only his younger brother, Sasuke. He afterwards joined the international criminal organisation known as Akatsuki, whose activity brought him into frequent conflict with Konoha and its ninja — including Sasuke — who sought to avenge their clan. Following his death, Itachi’s motives were revealed to be more complicated than they seemed and that his actions were only ever in the interest of his brother and village, remaining a loyal shinobi of Konohagakure to the very end.
From a young age, Itachi was quiet and insightful. He lived at a distance, observing individuals and ideas without getting directly involved so that he could fully understand them. Although this approach prevented him from becoming close with many people, it enabled him to think and act without prejudice or preconceptions, instead evaluating things strictly on their own merits. He would think about shinobi and 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; though he loved his family and wanted the best for them, he knew there were more important things than the Uchiha’s aspirations.
Despite being a pacifist by nature, Itachi felt his own needs were secondary to the greater good’s; to that end he became a shinobi. He trained tirelessly to improve himself as quickly as he could and subjected himself to all of the shinobi life’s inconveniences without complaint for the simple motivation of being useful to others. Being so accomplished as a ninja enabled Itachi to approach problems less violently than others would, satisfying his peace-loving nature. These two extremes of his personality came into conflict as events moved toward the Uchiha Clan Downfall; he did not want to harm his family and sought a peaceful resolution, but knew that the path with the least bloodshed would be the clan’s extermination. As the inevitability of the massacre became more apparent, Itachi’s normally polite attitude to his clansmen became more violent, criticising them openly and lashing out at them for the choices that sealed their fates and his own.