In fanfiction, if Goku and Vegeta go back in time, one big challenge would be fitting into the past society. The Saiyan society in the past had different rules and values. They may struggle to adapt to that. Moreover, they need to be careful not to disrupt the natural flow of events too much, as it could have unforeseen consequences. For instance, if they change the way a certain character develops, it could lead to a much more powerful enemy later. And they may have to deal with the fact that their knowledge of future events might not be as useful as they think, since the past could be more complex than they anticipate.
They might face the challenge of not being recognized by their past selves or other characters. Also, they could accidentally change things in a way that creates new and more dangerous villains. Another challenge could be dealing with the technology and power levels of the past, which are much lower than what they are used to.
In fanfiction, if Goku and Vegeta go back in time, they might change the course of history. For example, they could prevent some of the villains from ever becoming powerful. They may also meet their past selves, which could lead to some really interesting battles or training sessions. And they could introduce new techniques to their past counterparts, making the Saiyans even stronger earlier in the timeline.
Well, they could change the entire timeline. Maybe they'd go back and team up with their younger selves to take on foes that were previously too powerful. They might also influence the relationships between characters. For instance, Vegeta could potentially have a different attitude towards the Z - fighters earlier, which would change the dynamics of their group. It could lead to a whole new set of adventures and battles that we haven't seen in the original story.
When Goku and Vegeta go back in time in fanfiction, their relationship might take an interesting turn. They could become mentors to their younger selves. This new role could bring them closer as they have to work together to guide their past versions. Also, they might have to rely on each other more in the past because they are the only ones who know what the future holds. This could strengthen their bond and make their relationship less about competition and more about cooperation and mutual growth.
They might change the course of history and prevent some major disasters.
They might face the challenge of being recognized as clones from the future. If the people in the past see them as some kind of strange new threat, they could be attacked on sight. Also, their technology might not be compatible with the past's infrastructure, causing problems with their equipment.
One challenge could be protecting the baby from their enemies. Vegeta has made many foes over the years, and they might target the baby. Also, Vegeta's Saiyan nature might make him push the baby too hard in training, while Bulma wants a more relaxed approach. This difference in parenting styles could cause some friction between them.
One challenge could be adjusting to the different technology and ways of the past. For example, if they go back to a time before modern ninja tools, they'd have to rely on more basic equipment. Another challenge would be not accidentally changing the future in a bad way. They might also face challenges like being suspected as spies since they are from the future.
Perhaps he wants to save his friends. If he knew in the future that some of his friends died in certain battles, he might go back in time to change that. For instance, if Piccolo died in a fight with a powerful enemy, Goku could go back and help Piccolo, using his more advanced skills and power.
Yes, in the vast world of fanfiction, there are all kinds of creative and out - of - the - box stories. Some fans like to explore unusual relationships and scenarios, so it's possible that there is such a fanfiction out there. However, it goes against the original canon of the Dragon Ball series in many ways.
Bulma could be involved. Since she has a relationship with Vegeta and is friends with Goku, she might try to mediate between them when Goku snaps at Vegeta. She could be the voice of reason, trying to calm both of them down and make them see each other's point of view.