Uchiha Obito

Obito Uchiha (うちは オビト Uchiha Obito), also known under his alias Tobi (トビ) is the true leader of Akatsuki and the primary antagonist for most of Part II. As a child during the Third Great Ninja War, Obito was almost identical to Naruto, including sharing the dream of becoming Hokage, and was originally Kakashi Hatake's teammate in Team Minato. When their teammate Rin (whom Obito was in love with) was kidnapped by Hidden Stone Ninja during a mission, Obito and Kakashi rescue her but at the cost of the right side of the former's body crushed in a landslide. Believing his death is certain, Obito has Rin transplant his left Sharingan into Kakashi to replace the latter's original left eye. After the rest of his body is buried, however, Obito is saved by Madara Uchiha,, who notes that it was like the rocks went right through him, probably using his Kamui ability to become intangible to some extend.