In such fanfictions, there could be various scenarios. It could be that someone hurt Bulma physically or emotionally, and Vegeta is out for revenge. Or perhaps there's a mystery to solve about what happened to her. The possibilities are endless!
Another character could be Dr. Briefs, Bulma's father. In the alternate universe, he might have a more prominent role in bringing Vegeta and Bulma together. For example, he could be the one who arranges for Vegeta to work on a project with Bulma, which starts their relationship on a more professional note that gradually turns into something more personal.
No. Abuse is never an appropriate topic, especially when it involves beloved characters from a popular series like Dragon Ball. It goes against the positive values that the series usually promotes.
In general, sunbathing nude in public is not appropriate as it goes against social norms and decency. However, in some private and secluded areas where it is legal and not visible to the public, a mom might choose to sunbathe nude if she feels comfortable. But she should also consider the potential impact on others if accidentally seen, such as her children or neighbors.
There may not be a widely known 'nude family story' in the mainstream sense as the concept might be considered inappropriate or misinterpreted easily. However, there are some stories in the context of certain art movements where families have been depicted nude to convey deeper meanings such as innocence, unity, or the natural state of humanity. But these are more in the realm of art history rather than a common 'famous' story.
Swimming nude as a boy is not acceptable in most settings. Public places have rules about proper swimwear for a reason. It protects the privacy and comfort of others. Additionally, it can lead to various problems such as potential harm to one's own body from the elements or possible unwanted attention.