Who was Black Zetsu created by? (Manga Spoilers) Was Black Zetsu made by Kaguya this whole time? Or did Madara (being her reincarnation) accidentally create her will, which once fused with Madara became Kaguya again?
Black Zetsu was created by Kaguya Ōtsutsuki shortly before she was sealed as the Ten-Tails by her sons. Black Zetsu was created from the will of Kaguya Ōtsutsuki. With the goal of reviving Kaguya Ōtsutsuki, Black Zetsu manipulated Indra and his descendants, the Uchiha clan, along with Asura's descendants, the Senju clan, in an attempt to get one of them to awaken the Rinnegan. Madara Uchiha eventually succeeded in doing so, and Black Zetsu began secretly manipulating events to have Kaguya resurrected. He succeded when he had the rennigan and enough chakra to do so.