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.
The three commonly used words in novel creation were:
1. Fictional painting usually refers to an art form that mainly uses painting to portray the plot, characters, and scenes of a novel more vividly so that readers can more intuitively feel the atmosphere and emotions of the novel. The characteristics of novel painting were that it focused on visual expression and the feeling of the picture. It usually used a lot of colors and lines to express the plot and characters in the novel.
2. Painting usually refers to a form of literature. It refers to the use of painting as an auxiliary form of literature to express the theme and emotions of the novel through painting. This form of literature usually had the characteristics of painting, such as attention to detail and expressiveness, as well as the use of color and lines to convey emotions and atmosphere.
3. The painting of the heart was a more pure form of painting, which focused more on painting skills and performance rather than literary forms. The main form of Ekishin was painting, which directly transformed the plot and characters in the novel into independent paintings to express the theme and emotions in the novel.
Therefore, the main difference between novel painting, painting intention and painting heart lies in their forms of expression and the aspects they pay attention to. Fiction-based painting focused on visual expression and the sense of painting to express the plot and characters in the novel through the form of painting; while the art of painting focused more on the form of literature, using painting as an auxiliary form of literature; while the art of painting focused more purely on painting skills and the ability to express the theme and emotions in the novel through the form of painting.
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.