Uub is often characterized as a pure - hearted character in Dragon Ball Super fanfic. His origin as the reincarnation of Majin Buu gives him an interesting backstory. He's usually shown as having a strong sense of justice, much like the other heroes in the Dragon Ball series.
There could be a uub and pan fanfiction where they meet for the first time in a strange place. Maybe it's a dimension that's a crossroads between their respective realms. They start off as strangers but gradually become friends as they learn about each other's powers and cultures. This type of story can focus on their character development and the building of their friendship.
Another place to search is FanFiction.net. It's been around for a long time and has a wide range of fan - created stories. Just use the search function and type in 'uub and pan' to see what comes up. However, the quality can vary, so you might need to do some sifting through the results.
Well, in a lot of Dragon Ball Super fanfic, Uub is seen as a bit of an enigma. Since he's a reincarnation, there's always the question of how much of Buu's power he can truly access. Some fanfics focus on Uub's relationships within the Dragon Ball universe. For example, his interactions with the younger generation like Pan could be really interesting. He could also be a key figure in new storylines that involve threats from other universes, as his power might be the tipping point in battles.
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.