The main characters are Future Trunks and Bulma. Future Trunks is a Saiyan - half human, half - Saiyan - who is known for his strength and determination. He has traveled through time to try and change the future for the better.
One idea could be that Trunks discovers a new power while on a mission, and Bulma helps him control it in a unique way. Maybe she creates a device that can enhance his power but also has some unforeseen side effects that lead to some comical and heartwarming moments between them.
One possible plot could be that Goten and Future Trunks meet during a time - traveling accident. They initially have some misunderstandings due to their different upbringings and experiences. But as they start to train together, they learn from each other's fighting styles and develop a deep friendship. They then team up to face a new, powerful enemy that threatens both their timelines.
Well, maybe Vegeta would be shocked to see Future Bulma at first. He might be confused about how she got there and what the future holds for them. Then they could start to share stories about what has happened in their respective timelines.
Maybe in the fanfiction, Future Bulma meets a younger Vegeta who has been sent to the future by some time - related accident. At first, Vegeta is confused and angry, but Bulma's intelligence and determination start to intrigue him. They could have a series of adventures together, with Bulma trying to help Vegeta adapt to the future while also using his strength to protect what's left of their world.
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.
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.
It could be a rogue Saiyan from an alternate timeline who has come to their universe to prove his supremacy. He is jealous of the power that Goten and Future Trunks possess and wants to take it for himself.
Vegeta could become more empathetic. Meeting Future Bulma might expose him to different perspectives and make him understand the consequences of his actions better.
Their relationship might start off rocky. Vegeta is a proud Saiyan and Future Bulma is a strong - willed woman. But as they face common enemies and challenges in the future world, they begin to respect each other. Vegeta might start to see Bulma not just as a weak human, but as a valuable ally. And Bulma would see the growth in Vegeta and start to develop deeper feelings for him.