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.
Often, Goku is paired with Toppo in fanfiction. Their power levels and different fighting philosophies make for an interesting dynamic. They can have epic battles or team - up against a greater threat.
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.
It's a complex sequence of events. Toppo gets eliminated due to a combination of powerful attacks from the opponent and his own exhaustion in the intense battle.
Another theme could be loyalty. Bardock might be loyal to the true potential of the Saiyan race while King Vegeta is loyal to the existing power structure. This difference in loyalty can create a great conflict in the fanfic. Also, there could be a theme of social change. As Bardock may represent the underclass Saiyans who want a change, and King Vegeta is the symbol of the old regime.
Well, it's really hard to say. Naruto has his powerful jutsu like Rasengan and Sage Mode, which give him great strength and speed. Vegeta, on the other hand, is a Saiyan with super strength and the ability to go Super Saiyan. In a fanfic, it could go either way depending on how the author wants to write it. Maybe if Naruto could find a way to disrupt Vegeta's ki, he could win. But if Vegeta goes Super Saiyan 2 or higher quickly, he might overpower Naruto.