Naruto (manga)
A rogue Hidden Leaf ninja. He joined the Akatsuki after slaughtering his clan. He was shown as a villain. After he died, Itachi was shown to be loyal to the Hidden Leaf. He only killed his family because they tried to take over when Danzo and Tobi told them to. Itachi joined Akatsuki after they agreed to keep Sasuke alive.  He planned to have Sasuke kill him. Itachi secretly stayed loyal to the Hidden Leaf by secretly spying on the Akatsuki. He was Kisame's partner..