A yeat decided to go on an adventure. It climbed up a big tree. But when it got to the top, it realized it was afraid of heights. It started screaming in its yeat - language which no one could understand. Then it tried to slide down the trunk but ended up getting stuck in a small hole halfway down. It was quite a hilarious situation for those who witnessed it.
Well, there was a yeat that thought it was a great artist. It would paint with berries on the rocks. One day, it painted what it thought was a beautiful portrait of itself. But it looked more like a big purple blob. When it showed it to the other yeats, they all burst out laughing, and the poor yeat couldn't understand why they didn't see the 'beauty' in its work.
Well, Vegeta would be a likely character. He might be initially suspicious of the female Goku. Maybe he thinks she's a threat or just can't believe there's another Goku - like being. He could be there to add some comical moments as he tries to understand the situation.
In general, it's a bit of a toss-up. The strength of Manga Goku and Anime Goku can vary depending on the specific arcs and battles. Sometimes, it might seem like one is stronger in a particular situation, but that could change in another.
Another possible main character could be the villain that forces the two Gokus to meet. This villain could be a new, super - powerful threat that the two Gokus need to deal with. Their meeting becomes a crucial part of the story to defeat this powerful foe.
One of the characters who could betray Goku is Piccolo. Although they've been allies for a long time, in fanfiction, things can change. Perhaps an ancient evil force takes control of Piccolo's mind and makes him turn on Goku. Or it could be Krillin. He might be influenced by an outside force that convinces him Goku is becoming too dangerous. Also, don't forget about the Kais. If there's some sort of power imbalance or a threat they perceive from Goku, they might betray him to maintain the order of the universe in the fanfiction.
Well, it could be about Goku Jr learning some of Goku's most powerful moves. Maybe Goku teaches him the Kamehameha. They might also go on an adventure together, like fighting a new and powerful enemy that neither could face alone.