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.
Character development is also crucial. In many such fanfictions, Female Goku Black may start as a villainous or at least antagonistic character. But as the story unfolds, she might change due to her interactions with Goku. This transformation can be really interesting to follow. For example, she could start to question her own motives or even develop feelings for Goku, which is a big shift from her initial stance.
One popular 'goku x female goku black fanfiction' might be 'The Unlikely Bond'. It explores a unique relationship between Goku and Female Goku Black. In this fic, they start off as enemies but gradually discover they have more in common than they thought.
In some versions, the female Goku could be part of a prophecy. The two Gokus meet, and at first, there is some confusion and misunderstanding. But as they get to know each other, they discover that they are key to fulfilling the prophecy. They combine their powers and defeat an ancient evil that was threatening both of their worlds.
One idea could be that the female Saiyan is from a different part of the universe. She's heard tales of Goku's power and comes to Earth to challenge him. But when she meets him, she realizes he's not just about power but also has a kind heart. So instead of fighting, they start training together.
One common theme is the power - dynamic. It often shows how a female character interacts with Goku's extreme power. For example, she might be in awe of it at first and then strive to reach a similar level.
You can try fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. They have a large collection of fanfictions, and you can search for 'Saiyuki Female Goku' specifically. Just use the search bar on the site and browse through the results.
Sure. Fanfiction writers have a lot of creative freedom when it comes to Goku and Female Broly. In some fanfictions, they might be in a romantic relationship, which is an interesting take considering their Saiyan heritage and the way they both value strength. However, not all fanfictions take this route. Some might explore a more platonic friendship where they respect each other's power and learn from one another. You can usually find a variety of these stories by using the search function on major fanfiction platforms.
A cool fanfiction is the one where Female Goku and Bulma accidentally end up in a parallel universe. They have to figure out how to get back home while also dealing with the different versions of their friends and foes in that universe. It has a lot of action and some really interesting character interactions.
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.