In a fanfiction, there could be a story where an enemy specifically targets Baby Trunks because of his Saiyan heritage. Bulma steps up as his protector, using her inventions to fend off the attacks. Along the way, they develop a stronger bond as they face this common threat together. Bulma also discovers new aspects of her own strength and courage in protecting Baby Trunks.
One idea could be a story where Bulma invents a new device to help Baby Trunks train more effectively. For example, she creates a gravity simulator that allows him to train in conditions similar to different planets.
One idea could be a story about Bulma's inventions and how Baby Trunks gets involved in her experiments. For example, he could accidentally activate a device that sends them on an adventure through time or to a different dimension.
Their relationships are often shown as loving yet complex. Vegeta, who was once a cold - hearted warrior, has a soft spot for his family. He is protective of Bulma and Baby Trunks. Bulma is the brains of the family, and she manages to keep Vegeta in check. Baby Trunks is the source of joy and also a reason for Vegeta to strive to be a better person.
A plotline might involve a strange lemon - scented mist that affects Gohan's and Bulma's memories. They start to recall alternate versions of their lives and have to work together to figure out what's going on. Along the way, they might discover secrets about their pasts and how they are more connected than they thought, all while the lemon - scented mist continues to play a role in the mystery.
Fanfiction can explore their relationship by looking at their cultural differences. Vegeta is a Saiyan from a warrior race, while Bulma is a human scientist. Baby Trunks is a mix of both. So, a story could be about how they teach Trunks about his dual heritage, like Vegeta teaching him about Saiyan pride and Bulma teaching him about human values like kindness and curiosity.
A fanfiction could focus on a day in the life of the family. Bulma could be working on some new invention in her lab, Vegeta is training hard outside, and Baby Trunks is getting into all sorts of cute mischief. Then, something unexpected like a small alien invasion occurs near their home, and they all have to work together to deal with it.
A possible scenario is that Vegeta gets involved in a fight that he knows is dangerous but still pursues it, and as a result, his enemies target Bulma and Trunks. Another is that he may be under some sort of mind control in the fanfiction and end up attacking them unknowingly. Also, his pride - driven actions, like trying to prove himself as the strongest, could lead to situations where Bulma and Trunks are put at risk, for example, if he challenges a much stronger opponent near their home.
A great plot twist could be that Baby Trunks is actually from an alternate future where things are very different. This would change the whole dynamic of how Bulma relates to him. Maybe in this future, Bulma didn't survive, and now he has come back to change the past.
One possible plotline could be a time - travel scenario. Goku accidentally travels back in time to when Bulma was younger, and in a moment of confusion or trying to blend in, he kisses her as part of the local customs in that time period. Another could be a parallel universe where their relationship dynamics are completely different, and a kiss is a normal part of their friendship - like banter.
One possible plotline could be that Trunks, after turning into a girl, has to adapt to a whole new set of social expectations. For example, he might struggle with how others now perceive and interact with him. Maybe he was used to being seen as a strong male fighter, but as a girl, people might treat him more delicately at first. Another aspect could be his relationships. His friends might be a bit shocked at first but then come to accept him. And he could also have new romantic interests or challenges in that area, as his new form might attract different types of people.