Goku would probably interact very enthusiastically. He'd be eager to train with the strong members like Captain America and Black Widow. He might be a bit puzzled by some of their technology, but would quickly adapt.
You can try some popular fanfiction websites like FanFiction.net or Archive of Our Own. They usually have a wide range of Dragon Ball related fanfictions, including ones about Goku and Launch's relationship.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own (AO3). These platforms have a large collection of Dragon Ball Z fanfictions, and you can specifically search for ones related to Female Majin Goku.
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.
Well, it could make Bardock more in awe of Goku. He might see Goku as an untouchable being now. This could lead to a more distant relationship at first, as Bardock may feel unworthy to be close. But over time, he could also become a very devout follower or protector of Goku in a new way.
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.