Zamasu

Zamasu was a Kai apprentice in Universe 10 and a prodigy who studied under Gowasu. Beneath his noble appearance lay a growing contempt for mortals, whom he viewed as inherently corrupt and unworthy of divine protection. This hatred led to two separate acts across timelines: present Zamasu stole Goku's body (becoming Goku Black), while future Zamasu used the Super Dragon Balls to wish for immortality. These were two distinct versions of the same individual using the Super Dragon Balls. His radical ideology — the Zero Mortal Plan — led to catastrophic events across multiple timelines and made him one of the most dangerous antagonists in Dragon Ball Super.