Goku Black

Goku Black, also known as Zamasu, though usually referred to as Black, is an alternate incarnation of Zamasu and a former North Kai and Supreme Kai apprentice serving his former master Gowasu from the unaltered main timeline within Universe 10. Black visited Universe 6, went to the Super Dragon Balls from the unaltered main timeline within that universe, summoned Super Shenron from 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, an alternate counterpart of him. When he arrived to Future Trunks' timeline, he initially referred to himself as Goku. However, due to the notable style and color difference between Black and Goku's clothes, he was given the name "Goku Black" by Future Bulma. Thus, he took the name even when he revealed his own identity. While willing to defeat, regardless, he desires to fight strong opponents.