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 novels, laughter usually refers to a humorous, funny, or ironic way of laughing. It often uses exaggeration, sarcasm, irony, and other techniques to make the protagonist do some funny, abnormal, or absurd behavior to make the reader laugh.
There were many kinds of smiles in novels.
Exaggerated laughter: To achieve humor by exaggerating facts or exaggerating things.
2. Satire laughter: Through the irony of the bad phenomena in society, revealing the absurdity and comical aspects, it produces laughter.
3. Ironic laughter: Through metaphor and comparison, the reader will feel absurd and ironic, but it is actually a kind of irony and thus produce laughter.
4. Unexpected Laughter: At the climax of the plot, the protagonist makes some unexpected actions or decisions that make the reader laugh.
5. Humor and laughter: Through the humorous handling of language, plot, characters, etc., the reader will have a pleasant and relaxed feeling to achieve the effect of laughter.
The laughter in the novel was a complicated way of laughing. It required a variety of techniques to achieve humor, irony, and touching effects that would resonate and make the readers happy.
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.