The main character could be a Saiyan gamer who was born on Earth but discovers his Saiyan heritage through the game. He then uses his knowledge of the game to train faster and become stronger than he ever thought possible, kind of like Gohan but with a more gamer - like approach to his training.
Goku could still be the main character even in a dimension - hopping fanfic. His adaptability and thirst for stronger opponents would make him a great fit to explore different dimensions.
It could be a completely new character created just for the fanfic. Somebody with a booming voice and a flamboyant personality, who loves the thrill of the Dragon Ball Z battles.
Goku could be an interesting main character in a vampire fanfiction. Imagine Goku having to deal with the newfound thirst for blood while still trying to protect the Earth. His strong moral compass would be put to the test as he battles against his vampire instincts.
Goku would be a great main character for a Dragon Ball Z haircut fanfiction. His wild hair is such an iconic part of his look. You could write about how a new adventure changes his view on his hair and he decides to get a different style. Maybe he wants to look more like the people on a new planet he visits.
Vegeta would also be a popular choice. His pride and determination would make it interesting to see him interact with the gamer elements. He might initially be resistant to the idea but then see it as a way to finally surpass Goku.
One idea could be a gamer getting transported into the Dragon Ball Z universe and having to learn the ki techniques like a newbie Saiyan. They could start from the very bottom, training with Goku or Vegeta, and slowly rise in power. Another could be a gamer who has the ability to hack the Dragon Ball Z game world in a way that changes the rules, like making the Dragon Balls more accessible but with a new set of challenges to face when using them.
Goku could be the main character. Imagine Goku being hypnotized and having to fight against the control while still trying to protect his friends and the Earth. It would be a great twist on his usual heroic self.
The main characters often include Dark Goku and the Z - fighters. Among the Z - fighters, Piccolo is an important one. His wisdom and combat abilities can be crucial in dealing with Dark Goku. Krillin also has his place. His long - standing friendship with Goku and his own fighting skills add depth to the story. And Master Roshi might also make an appearance, perhaps as an advisor or someone who has some knowledge about an ancient power that could be relevant to the fight against Dark Goku.
Obviously, Bardock is one of the main characters since it's about his rebirth. Goku might also be involved as Bardock is his father. Vegeta could potentially show up too, as he is an important Saiyan in the Dragon Ball Z universe.
Super 17 himself could be the main antagonist if the fanfiction focuses on his corruption. He could be consumed by power and decide to rule over the universe. His already - formidable powers would make him a terrifying opponent for the Z - fighters, and they would have to find new ways to stop him without relying too much on their usual techniques.