If Zamasu had never wished for Goku Black's body, he'd have been strong enough to defeat his foes without mutating. In the manga, it's actually the wish for immortality that causes this mutation.

Zamasu’s Ambition - Presenting the Terrifying Zero Mortals Plan Goku, Vegeta, and Trunks battle Black and Zamasu one more ...

As we revealed in our original explanation of the Zamasu and Goku Black connection – Whis and co. were almost right about Black’s origin, but they missed one important detail: Goku Black isn ...

In “Zamasu’s Ambition” Goku can put up a good fight, but he allows himself to get angry when Goku Black pushes his buttons and uses his family as a trigger.

Reviews Dragon Ball Super Episode 58 Review: Zamasu And Black – The Duo’s Mystery Deepens. Goku and friends play detective while some real headway is finally made with Zamasu and Goku Black ...

While it’s still not confirmed, Goku Black and Zamasu are indeed working together in order to create a “utopia” for the gods, but their true connection may lie deeper than that.

Zero. If players pre-ordered this edition of the game, they would be able to Summon Shenron and unlock Goku Black, Zamasu, and Fused Zamasu.

The Supreme Kai Zamasu from Universe 10 also utilizes dark ki and it’s thought that that he is connected to Goku Black in some way but, again, details on that are currently scarce.. In any case ...

This Goku Black card leads Ultimate Deck 2023. The Leader Front shows Goku Black, who is actually the fallen and vengeful Kai Zamasu who wishes himself into Goku's body from another timeline.