Itachi Uchiha (Anbu Version) of Naruto

Itachi Uchiha 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.

Though peace-loving, Itachi was a natural prodigy in the shinobi arts, praised as the best of his generation. At age 7, Itachi graduated from the Academy at the top of his class; at age 8, he mastered the Sharingan; at age 10, he passed the Chūnin Exams; at age 11, he entered the Anbu; by age 13, he was promoted to Anbu captain. Itachi's accomplishments were a source of great pride for his family, his father viewing him as proof of the Uchiha's future prosperity and his brother viewing him as a model to live up to. Itachi spent a great deal of time with Sasuke, training with him (though rarely actually training him) and giving him the recognition their father did not. But for all the attention he received, few truly understood Itachi, believing his isolation to be a result of the gap between his abilities and theirs and not his dissatisfaction with the shinobi's life of conflict.

Itachi shared the burden of betraying his clan with Shisui, his best friend, brother-figure, and a like-minded Uchiha whom he met for the first time at age five. But as time went on it became increasingly clear that peace could not be achieved. Shisui attempted to use his Kotoamatsukami on the Uchiha's leaders to compel them to negotiate, but his right eye was stolen by Danzō Shimura before he had a chance. His own options exhausted, Shisui entrusted his remaining eye to Itachi and begged him to protect the village and their family name before drowning himself in the Naka River. Itachi was anguished by Shisui's death, enough to awaken his Mangekyō Sharingan. When the following day some Uchiha, already suspicious of Itachi, accused him of murdering Shisui and staging a suicide, Itachi lost his composure and attacked them, defeating them easily. A rift was created between Itachi and his family, and his warnings to them to reconsider what they were doing fell on deaf ears.