Goku Black

Goku Black, usually referred to as Black, is the main antagonist of the "Future" Trunks Saga of Dragon Ball Super. His true identity is Zamasu from the unaltered main timeline within Universe 10. He is a former North Kai and Supreme Kai apprentice serving his former master Gowasu. Goku Black visited Universe 6, went to the Super Dragon Balls from the unaltered main timeline within that universe, summoned Super Shenron from the said timeline, wished to switch bodies with Goku from the unaltered main timeline within Universe 7, and Super Shenron granted Goku Black's wish. Goku Black sought to destroy all mortals alongside Future Zamasu. He was then given the name "Goku Black" by Future Bulma when he initially referred to himself as Goku.