Zamasu is a central antagonist in the Dragon Ball Super anime series. He is originally a Supreme Kai apprentice from Universe 10 with a deep-seated sense of justice that turns into a fanatical hatred of mortals. Zamasu orchestrates the 'Future' Trunks Saga, using the Super Dragon Balls to switch bodies with Goku and become Goku Black. His actions threaten multiple timelines, making him one of the series’ most formidable and complex villains.