One of the members of the evil organization known as the Akatsuki. He is Deidara's partner, and no one is really sure where he came from since he has no forehead protector. Instead, he has an odd swirly orange mask that covers his entire face, save for one eye. He tends to take the credit for a majority of battles which Deidara actually won. He is odd in comparison to the other Akatsuki members, with his childish (And rather cute, in my opinion) behavior.
Zetsu's white half often says "Tobi is a good boy."