Black Zetsu (黒ゼツ, Kuro Zetsu) is the physical manifestation of Kaguya Ōtsutsuki's will. Having been created to secure its creator's revival. Is partnered with White Zetsu, also known as Shiro Zetsu, to become half of the Akatsuki member known simply as Zetsu.

Kuro Zetsu is serious, manipulative and critical. Shiro Zetsu is kind to his allies and have a childish personality. Both of them sometimes argue about being dissent with each other. Regardless, they still working with each other very well