One possible analysis could be that it often explores the dynamic between two powerful and complex characters. Goku Black, with his menacing and somewhat twisted nature, and Vegeta, the proud Saiyan prince. In fanfics, their interactions can range from intense battles to unexpected alliances. Maybe it delves into how Vegeta would react to Goku Black's presence, given their different ideologies and power levels.
Some fanfictions explore their friendship. 'A Saiyan Bond' is about how Kid Vegeta and Baby Goku start to respect and care for each other. They begin to understand that they are not so different after all. It's a heartwarming story that shows the potential for friendship between two strong - willed Saiyans.
The baby might be really competitive, getting that from both of them. Vegeta is always striving to be the best, and Goku loves a good fight. But it could also be really kind - Goku's a good - hearted guy, so that would rub off. Maybe a bit of a goofball too, like Goku.
The popularity comes from the contrast between them. Kid Vegeta is often portrayed as more arrogant, while Baby Goku is more innocent. This contrast creates interesting dynamics in the stories.
Many fanfics have a plot where Goku Black challenges Vegeta's place as the second - strongest Saiyan. This leads to a series of battles and power - up moments for both characters. There could also be a plot where Goku Black infiltrates Vegeta's family life, causing chaos and forcing Vegeta to not only protect his family but also prove his worth as a fighter. And sometimes, the plot focuses on the power struggle within the Saiyan race, with Goku Black representing a new and dangerous element to Vegeta's understanding of Saiyan power.
If Goku and Vegeta had a baby in fanfiction, its powers could be unique in various ways. Firstly, it could have a power that is related to the fusion dance but without the need to perform the actual dance. So, it could have a natural ability to access the power levels of a fused form. Secondly, it might have an ability to sense and manipulate energy in ways neither Goku nor Vegeta can. This could include being able to absorb different types of energy from the environment and convert it into ki for itself. Thirdly, due to the combination of their genes, it could have a power that is unlocked only during extreme emotional states, which are different from the typical Super Saiyan anger - perhaps a state of extreme determination or love.
Well, if they were brothers in a fanfic, it could change how they interact with the other characters. Maybe they'd have a deeper understanding and fewer power struggles between them. Also, their family background and upbringing could be explored in new and interesting ways.
It's a bit hard to say for sure. Both Vegeta and Goku have their moments of strength. Goku has some unique powers and techniques that give him an edge at times, but Vegeta is no slouch either and constantly works to catch up and surpass Goku.