Madara "creates" Black Zetsu. In reality, Black Zetsu was the spawn of Kaguya Ōtsutsuki's will, before she was sealed away by her two sons. Dr. Arliss Loveless betrays and murders General Bloodbath McGrath. He then Procedes to take over Madara’s 6 path body and Transform him into Kaguya. After Madara claimed to be the savior of the world by trapping everyone in the infinite tsukoymi.
Krang betrays the Shredder, revealing he was using him to open a portal to Dimension X for the Technodrome to emerge through. After Madara Uchiha summoned the statue and cultivated Hashirama Senju's DNA into a large flowering tree, Black Zetsu removed White Zetsu and the other victims from inside the husk, leading Madara to believe they were artificial humans created by the statue's chakra and Hashirama's DNA. Black zetsu told Madara a lot of things to get into his head. How did Black Zetsu manage to take down Madara the 10 tails Jinchuriki.
Shouldn't Naruto and Sasuke had fought and defeated him first? Black zetsu attaches himself to Madara to help him live. As I read the Naruto Episode 656 Page 14, Obito cast Rinne Tensei then suddenly the black zetsu appeared then cast another Rinne Tensei then poof Madara is … When Madara was on the verge of death, he believed he had created Black Zetsu by imbuing his will into half of White Zetsu, and that the complete Zetsu was partially his clone. Which is why he went back to attack Konoha. This is personally the most B.S Reasoning Ever. When Madara had seemingly created White Zetsu and the others, it was actually Black Zetsu pulling the transformed humans from Kaguya's Infinite Tsukuyomi out of the Demonic Statue of the Outer Path. Black Zetsu was created by Kaguya Ōtsutsuki before she was sealed as the Ten-Tails by her sons, Hagoromo and Hamura. Kishimoto never explicitly stated he had Black Zetsu kill Madara because he wrote himself into a corner at the end of the series. Don't you think that was a bit of an exaggeration? When Madara was on the verge of death, he imbued Black Zetsu into White Zetsu's right half, believing the former was a manifestation of his will. Black Zetsu betrays Madara to take over the power of the Infinite Tsukuyomi and revive Kaguya. Black Zetsu came to Madara one day after he left Konoha.
Black Zetsu didn’t kill Madara, he/Kaguya pretty much just possessed his body.
Black Zetsu is the secondary antagonist of the Naruto franchise. He initially served as Madara's right-hand man and a servant to Obito.He worked as an agent of the Akatsuki, in which he functioned as the organization's spy and worked alongside White Zetsu.. Actually, Black Zetsu kills Madara, while in his 6 paths Mode.