- The Goku Black Theory: This theory is based on the character of Goku Black, who is a twisted version of Goku from an alternate timeline. In this theory, Goku Black is actually Zamasu, a Kai who was corrupted by his hatred of mortals. Zamasu took Goku's body and used it to wreak havoc on the universe.
- The Goku Controlled by Babidi Theory: This theory is based on the character of Babidi, a powerful wizard who tried to control Goku in the Majin Buu saga. In this theory, Babidi was able to successfully control Goku and turn him into a Majin. Goku would then go on to destroy the Earth and everything on it.
- The Goku Who Was Raised by Raditz Theory: This theory is based on the idea of what would have happened if Goku had been raised by his evil brother, Raditz. In this theory, Goku would have been trained to be a ruthless warrior and would have eventually turned on his friends and family.
These are just a few of the many "Goku evil" theories that have been proposed. While there is no way to know for sure what would have happened if Goku had turned evil, these theories offer a fun and thought-provoking way to explore the character.