Well, it could be about Bulma being betrayed by a close friend in the Dragon Ball universe. Maybe that friend reveals her secrets to an enemy, like her latest inventions or the location of the Dragon Balls she was guarding. This would put her in a dangerous situation and lead to a series of adventures where she has to fix the mess.
Yamcha could potentially betray Bulma. Even though they have a history together, in a fanfic scenario, he could be jealous of Bulma's growing closeness with Vegeta or her scientific achievements. So, he might do something to undermine her, like spreading false rumors about her work.
The plot might involve Bulma creating a new device that has some unexpected side effects. Gohan then comes to help her fix it. Along the way, they might encounter some old enemies or new threats. And perhaps through this experience, they develop a deeper understanding and friendship. For example, Bulma could be working on a time - travel device and accidentally sends them both to a different era, where they have to rely on each other to get back home.
In a fanfic, the Bulma - Chichi fusion could be part of a tournament arc. They enter the tournament fused and shock everyone with their abilities. Their opponents underestimate them at first, thinking it's some kind of strange trick. But as the battles progress, they show that their fusion is not only powerful but also has a deep understanding of both martial arts and strategic thinking.
Well, the plot could involve them fusing due to some kind of magical or technological accident. Maybe they are trying to defeat a powerful enemy together and their combined energy causes them to fuse. They could then have a new form with combined powers and a unique personality that is a blend of their own.
Perhaps Bulma wishes for a boyfriend who can understand her scientific pursuits. In the fanfic, she could find someone who is also a brilliant scientist from another planet. They start collaborating on projects together, and as they work closely, feelings develop. But there are obstacles. Their different cultures might clash, and there could be other characters who are envious of their relationship. For instance, some of Bulma's rivals in the scientific community might try to sabotage their relationship to get ahead in their research.
One possible plot could be that Bulma and Chichi team up for a scientific - martial arts tournament. Bulma uses her intelligence to create unique gadgets for Chichi to use in the combat part of the tournament. This brings them closer as they train together and face various opponents.
One possible plot could be centered around how Vegeta adjusts to the idea of becoming a father. He's a proud Saiyan warrior, so he might initially struggle with the more nurturing aspects. For example, he could be shown trying to train while also being worried about Bulma's well - being during her pregnancy. Maybe he starts to research Saiyan pregnancies to make sure everything is going as it should.
Well, in a fanfic like this, perhaps it could explore their relationship deeper. Maybe it shows how their different personalities, Vegeta's tough Saiyan nature and Bulma's feisty human side, come together in an intimate way. It might also involve how they deal with the challenges of being from different species while being in love.
Well, it could be that Bulma realizes that the relationship with Vegito is just too complicated or dangerous. Maybe she decides that she can't handle the chaos that often surrounds Vegito, like all the battles and threats that come with being associated with him.
Well, it could be about Bulma finding Kal - El (Superman as a baby in the DC lore). Maybe she discovers him in some sort of space pod crash on Earth in the Dragon Ball universe. She decides to raise him, and Kal - El starts to grow up with all the advanced technology of Capsule Corp around him.