In many fanfics, it's really hard to say for sure. Android 18 has her android strength and durability. Vegeta, on the other hand, is a powerful Saiyan with his Super Saiyan forms. If the fanfic writer focuses on Android 18's infinite energy, she could potentially outlast Vegeta. But if Vegeta quickly ascends to a high - level Super Saiyan form like Super Saiyan Blue, his power could be overwhelming.
The main characters are clearly Fat Buu and Dr. Briefs. Fat Buu is a powerful and somewhat goofy character in the Dragon Ball series. Dr. Briefs is a brilliant scientist.
In this fanfiction, Fat Buu might befriend Dr. Briefs. They could have some comical exchanges. Maybe Fat Buu would be curious about Dr. Briefs' inventions and get into all sorts of wacky situations while exploring them.
A 'bardock vs king vegeta fanfic' could explore the backstories of both characters. Bardock's story as a Saiyan who starts to question the Frieza regime might contrast with King Vegeta's more traditional and perhaps self - serving rule. Their fight could be a symbol of the changing tides within the Saiyan community. It could also introduce new elements to the Dragon Ball lore, like different forms of Saiyan power that are unique to this fictional encounter.
In a fanfic, Naruto might power up by having a spiritual awakening. He could connect with the spirits of past Hokages in a deeper way, gaining their knowledge and some of their power. This could enhance his existing jutsu and give him new abilities. Vegeta could power up if he were to face a near - death experience against Naruto. This could trigger a hidden potential within him, like a new type of Super Saiyan form that has unique abilities. He could also fuse with another Saiyan (if there were another Saiyan available in the fanfic's scenario) to create an even more powerful being.