Black Zetsu (黒ゼツ, Kuro Zetsu) was the physical manifestation of Princess Kaguya Ōtsutsuki's will. It secretly instigated many of the events that shaped the shinobi world to secure Kaguya's revival.[4] To further its plans, it posed as Madara Uchiha's manifested will and then partnered with White Zetsu to become half of the Akatsuki member known simply as Zetsu (ゼツ, Zetsu).
Sealed by Naruto Uzumaki
Akatsuki Spy