In a fanfiction where Future Gohan meets Goku, it could be an emotional reunion. Gohan might be filled with a sense of relief and joy, seeing his father again. He could show Goku all the things he's been through in the future, and Goku would be both proud and sad about what his son has endured.
In the fanfiction, perhaps they team up to fight a common enemy. Goku's raw power combined with Gohan's strategic mind from the future battles could make them an unbeatable duo. They'd exchange blows and strategies, and their teamwork would be amazing to read about.
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.
One great 'Best Future Trunks Crossover Fanfiction' is 'Trunks and the Multiverse Adventure'. In this fic, Trunks travels across different universes and teams up with various versions of the Z - fighters. It has an exciting plot with lots of action and character development.
One common theme is time - travel adventures. Since Future Trunks is known for his time - traveling, fanfictions often explore different time - travel scenarios involving his female counterpart. For example, she might go back in time to change certain events in the Dragon Ball timeline.
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.
Perhaps a plot where Future Gohan and Future Trunks accidentally travel to an alternate timeline. There, they have to team up with different versions of themselves to defeat a common enemy. This would involve exploring how they interact with these alternate selves and how they adapt to the new environment and challenges.
A good 'Best Future Trunks Crossover Fanfiction' should first and foremost stay true to Trunks' character. His determination, his sense of justice, and his complex relationship with his timeline are all important aspects to maintain. For example, if he's crossed over into a different universe, his reactions to the new environment should be in line with what we know of his personality.
It could lead to some really interesting plot twists. Maybe Goku could prevent major disasters before they happen and change the course of events in the Dragon Ball universe.