I'm not directly part of the Xeno Forum's success story, but I can imagine that if I were, it would be because of the great networking opportunities. Meeting like - minded people who are into Xeno - stuff would be amazing. You could collaborate on projects, exchange knowledge, and even become friends.
The success might also lie in its management. Good moderators who ensure the rules are followed, keep the conversations civil, and promote healthy discussions can make a huge difference. They can also organize interesting events or threads that keep the members engaged. For instance, they could start a monthly 'Xeno - theory of the month' discussion where members can share their wildest ideas about Xeno - related things.
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.
Gohan would also be a good choice. As Goku's son, he has his own unique abilities. In a fanfiction, they could enter a father - son gaming tournament. Gohan's intelligence and strategic thinking could complement Goku's brute strength in the game.
In some 'Goku meets Goku fanfiction', they could team up against a super powerful enemy that neither could defeat alone. They would combine their signature moves like the Kamehameha for an ultimate attack.
The plot could involve Goku and Goku Black fusing accidentally. Maybe due to some strange energy anomaly. And then they have to figure out how to control this new form. They might initially be feared by their friends because of Goku Black's reputation, but then they prove that they are on the side of good by using their new powers to protect the Earth from an impending threat that no one else could handle.