The main characters are Goku, who has always been at the forefront of battles in the Dragon Ball universe, and the Saiyan Queen. The Saiyan Queen could be a character with her own set of powers and a complex backstory. Maybe she was once a great leader among the Saiyans but had to go into hiding or something. And Goku's presence in her life stirs up new events and emotions.
One possible plot could be that the Saiyan Queen is from a different part of the Saiyan planet that was long forgotten. Goku discovers her existence while exploring the remnants of the Saiyan world. She has a unique power that Goku is intrigued by. They train together and end up changing the future of the Saiyan race.
Obviously, Goku and 17 are the main characters. Goku, the Saiyan hero with his incredible power and love for fighting. 17, the powerful android with his own set of skills and a somewhat mysterious past.
If Goku was a Saiyan in a fanfic, it could explore different aspects of his heritage and potential. Maybe there would be hidden powers or ancestral ties that come into play.
Issei would be very likely. Since Issei is the main character in DxD, his curiosity and his own pursuit of power would make him interested in Goku. They could train together and learn from each other's abilities. Also, Rias would interact with Goku. As a powerful devil, she would be intrigued by Goku's power and his different way of approaching battles.
Android 21 and Goku are the main characters. Android 21 with her android intelligence and power is a key figure. Goku, with his super Saiyan forms and his indomitable spirit, is equally important. Their personalities are so different - Goku is more straightforward and pure - hearted, while Android 21 has a more complex and sometimes morally ambiguous nature. These differences create great potential for conflict and growth within the fanfic.
There could also be original characters created specifically for this fanfic. Maybe a game master who controls all the virtual worlds Goku enters. This character could be a bit of a mystery, with their own motives and backstory, and they interact with Goku in ways that drive the plot forward.
For Goku, you can focus on his growth as a fighter but also his naivete in relationships. Show how he reacts to the female Saiyan's presence, like his confusion about new feelings. For the female Saiyan, give her a distinct personality. Maybe she's more reserved than Goku in some ways but has a fiery side when it comes to fighting. Describe her backstory, like how she was trained on the Saiyan planet and what her goals are. You can also have them learn from each other. For example, Goku teaches her about the joy of fighting for the right reasons, and she teaches him about Saiyan traditions he may not be aware of.
Obviously, Bulma and Saiyan characters like Vegeta are mainstays. Vegeta is often a central figure as his relationship with Bulma is a rich area to explore in fanfic. Goku can also be prominently featured, especially when it comes to his Saiyan nature and how Bulma interacts with him in different scenarios.
Well, obviously Turles and Goku are the main characters. Turles is often depicted as the villain in the original story, but in fanfiction, he can be portrayed in different lights. Goku, on the other hand, is the hero. Their interactions and the development of their relationship form the core of the fanfiction.
Well, obviously Goku and Fasha are the main characters. Goku is known for his incredible strength and kind heart. Fasha, on the other hand, is also a Saiyan with her own unique personality and abilities. In the fanfiction, they are often the focus, whether they are going on adventures, falling in love, or training together.