What if Goku never got dropped on his head when he was a baby, and he maintained his evil side? Goku was sent to Earth in order to exterminate all life forms from it, but it took for one accident to make the Saiyan become the world’s most trusted hero (without counting Mr. Satan).
Later on, Goku liberated the world from the wrath of terrifying villains like King Piccolo, Frieza, Cell, Majin Buu, Baby, Zamasu, and others. But if Goku never got hit on his head, here’s what he would have looked like:
Some people pointed out that I forgot about Trunks and they are right. My bad, I didn't mean to let him live
— Lonely (@lslonelyshadow) October 4, 2020
There were already evil versions of Goku in the Dragon Ball franchise. Known as Goku Black, we’re actually talking about Zamasu’s spirit inside Goku’s body from a different timeline. Goku, Vegeta, and the others had a very rough time in trying to take down Goku Black and Zamasu. Both villains were actually one and the same being, only from different timelines. However, this didn’t stop the original Zamasu and the Zamasu from Goku’s stolen body to fuse with each other and create a much more powerful being known as Merged Zamasu.
Another situation when you could say that Goku became evil is when Captain Ginyu switched bodies with him during the Frieza saga from Dragon Ball Z. It was still another spirit present in Goku’s body, and Captain Ginyu tried by all means to use the new powers in evil ways. His mission failed in the end, as Goku managed to take him down after received great help from his son Gohan and Krillin.
It’s hard to believe for any Dragon Ball fan that Goku could really ever be one of the bad guys. The mighty Saiyan is well-known for being kind, gentle, defender of justice and peace, and also capable of showing mercy even to his most ruthless enemies.