A fictional character in the anime series Naruto
. He's the first Uchiha to awaken the Mangekyou Sharingan and one of the founders of the Hidden Leaf Village. When he discovered he was going blind, he stole his slightly less important little brother's eyes and got a new totally awesome eye ability. He also heleped Itachi kill the Uchiha clan, despite popular belief that Itachi did it himself.
He is apparently also Itachi's teacher, leading to the belief that they frequently engaged/engage in buttsecks
. Hot, sweaty, violent Uchiha buttsecks.