Goku Black in Xenoverse 2 has a complex story. He is an evil version of Goku from an alternate timeline. He causes a great deal of chaos and destruction, his power is quite formidable, and he challenges the heroes in the game.
The story could start with Goku being pushed to his limits by Goku Black's attacks. But then, he remembers his training with the Kai's and how they taught him to focus his energy in a more efficient way. He then uses this knowledge to create a more powerful Kamehameha that breaks through Goku Black's defenses and kills him.
If Goku Black fuses with Goku in fanfiction, the story would progress in a complex way. The fused form might go on a journey to understand itself. Since it has two very different personalities combined, it would face a lot of internal conflict. This could be used to explore themes like identity and the struggle between good and evil. Externally, the fused Goku could attract new enemies who see it as a threat to their power or plans.
Well, the Goku Black story is quite complex. Goku Black first appears and starts causing trouble. He has Goku's strength but Zamasu's malevolent mind. He challenges Goku and Vegeta multiple times. His actions are driven by Zamasu's hatred for mortals. There are also the time - ring related aspects which tie into the whole alternate timeline concept. He teams up with another version of Zamasu later, and together they pose a huge threat to the entire universe.
The main characters are Goku Black (Zamasu in Goku's body), Goku, Vegeta, and Zamasu in his original form. Goku and Vegeta are the ones trying to stop Goku Black's evil plans.
Goku Black was created when Zamasu, a Supreme Kai - in - training from Universe 10, became disillusioned with mortals. He used the Super Dragon Balls to swap bodies with Goku. This allowed him to have Goku's powerful form and skills. Zamasu, now in Goku's body, named himself Goku Black and started his rampage across different universes with the goal of eradicating mortals.
Zamasu is often paired with Goku Black. Since they are closely related in the original story, fanfiction writers like to explore their relationship further. It could be about their shared goals or how they interact on a more personal level.
One interesting fanfiction could be about Goku and Black Goku teaming up against an even greater threat from another universe. In this story, they might initially be at odds but gradually learn to work together, using their unique abilities to save the multiverse.
In fanfiction about Goku and Goku Black, a common concept is the alteration of their power levels. Writers may give Goku new forms or boost Goku Black's abilities in unexpected ways. There can be stories centered around Goku Black's adaptation to the main timeline's culture and society. For example, he might have to deal with the everyday life in addition to his evil plans. And there are fanfictions that focus on the psychological impact of their battles on each other, like how Goku might be affected by constantly facing an evil version of himself.
A Goku and Goku Black fusion in fanfiction could be really exciting. The fusion would inherit Goku's love for fighting and getting stronger, but also Goku Black's ambition. Their combined ki could be a new type of energy that no one has ever seen before. This new fused form might also have new transformations or abilities. For example, it could combine Goku's Super Saiyan forms with Goku Black's Rose form in unexpected ways. It could change the power balance in the Dragon Ball world and open up all sorts of new storylines, like teaming up with other characters to take on new threats or even having internal struggles between the two personalities within the fusion.