A great storyline in Vegeta and Bulma fanfiction could be them dealing with an alien invasion that specifically targets Capsule Corp. Vegeta has to protect his family and the company Bulma built. It would show his growth from just a warrior to a family man. Or perhaps a fanfic where Bulma creates a device that can temporarily give her Saiyan - like powers, and she trains with Vegeta. This would be a fun way to explore her character in a more action - oriented way. There could also be a story about their first meeting from Bulma's perspective, adding new details and emotions to the encounter.
One interesting storyline could be about Vegeta trying to be a better father to Trunks in a fanfic. He might struggle with his Saiyan nature while also wanting to show love and support like a human father. Another could be a time - travel fanfic where Bulma uses her genius to create a time machine again, and Vegeta goes back in time with her for some reason, like to prevent a future threat from ever happening. And there could also be a fanfic where Vegeta and Bulma have an adventure in a new, uncharted part of the Dragon Ball universe, facing new enemies and discovering new powers together.
One interesting fanfiction could be about Bulma and Vegeta going on a secret adventure together. Maybe they discover a new planet and have to work together to survive. Another could be a story where they deal with family issues related to their son Trunks in a very different way than in the original series.
One interesting fanfiction could be about their relationship during the time when Vegeta first starts to adjust to living on Earth. It might show how Bulma helps him understand Earth's customs and in the process, their relationship deepens.
One idea could be a story where Bulma and Vegeta go on a secret adventure together to find a new power source for Capsule Corp. Another could be a plot where they have to deal with an alien threat specifically targeting their family. Maybe a story about how they first fell in love from Vegeta's perspective, including his inner thoughts as he slowly warmed up to Bulma.
One interesting plot could be about Vegeta trying to understand Earth's customs for Bulma's sake. For example, he might struggle with things like birthday parties or family holidays. Another plot could be Bulma inventing a new device that gives Vegeta a new power boost, but it has some unexpected side effects on his Saiyan pride. Or it could be a story where they go on a vacation together to a new planet and face various challenges there.
Another storyline might be about them going on a small adventure together. They could encounter a new threat that isn't quite big enough to involve the whole Z - Fighter crew. This would give them a chance to show their relationship outside of the main battles, like Vegeta protecting Bulla in a more personal way.
The popularity also lies in the fact that the Dragon Ball Z series itself has a huge fan base. People are already invested in these characters. Fanfiction writers can then take these well - known characters and put them in new and exciting situations. Whether it's a romantic adventure, a family - oriented story, or a story about their individual growth while in the relationship, there are so many possibilities that appeal to different fans of the series.
In a Vegeta and Bulma wedding fanfiction, an interesting detail could be the wedding vows. Vegeta could vow to protect Bulma and the Earth not just because of his love for her, but also as a way to repay the kindness the Earth has shown him. Bulma, on the other hand, could vow to support Vegeta in his journey to become a better Saiyan and a better father. Also, the role of Trunks in the wedding would be cute. He could be the ring bearer, running around with the rings in his little hands, excited for his parents' big day. And the decorations could include Saiyan symbols intertwined with Earthling symbols, like the Capsule Corp logo and the Saiyan royal emblem.
One interesting fanfiction could be about Vegeta's struggle to adapt to family life with Bulma while still being a Saiyan warrior. Maybe he tries to teach Trunks Saiyan traditions in a world that's mostly human.
I really like 'Bulma and Vegeta: Partners in Adventure'. It's a fun fanfiction that has them going on all kinds of adventures together. It's full of action and also has some really sweet moments between the two. 'The Saiyan and the Scientist' is another great one. It explores how their different backgrounds - Vegeta being a Saiyan warrior and Bulma being a brilliant scientist - come together and create a really interesting dynamic in their relationship. And 'Vegeta's Soft Side for Bulma' is a great read as it shows the softer, more loving side of Vegeta that only Bulma gets to see.
There are fanfictions that focus on their family life. For example, a story might explore how Vegeta adjusts to being a father while still maintaining his Saiyan warrior pride. He might struggle with balancing training and spending time with his family, but Bulma is always there to keep him in check.