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.
Android 18 might have a power - up where she can better regulate her infinite energy. This would make her attacks more consistent and powerful. Vegeta could power up by learning from his past battles with other strong opponents. He might unlock a hidden potential within himself that gives him a boost in speed and strength. Also, he could merge his Saiyan pride with a new fighting style inspired by his allies.
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.
First, you need to understand the characters well. Know Android 18's cold exterior but her capacity for love and loyalty. For Vegeta, his pride and his journey towards becoming a better person. Then, start with an interesting scenario like them meeting in a new tournament. Keep their dialogues in character. For example, Vegeta might be a bit dismissive at first but also intrigued by Android 18's power.
One good example could be a fanfiction where Android 18 and Vegeta are forced to team up during a universal threat. As they fight side by side, they start to respect each other's strength, which gradually turns into love. Another example might involve a story set in an alternate universe where Vegeta is sent to Earth earlier and meets Android 18 when she is first activated. Their initial encounter is full of tension but over time, feelings develop.
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.
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.