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.
A third storyline could be set in an alternate universe where Bulla has some unique power. Vegeta then has to figure out how to help her control it. It could involve a lot of father - daughter moments of understanding, as Vegeta tries to use his own experiences with power to guide Bulla.
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 Bulla fanfiction could be about her training adventures. Maybe she decides to train with Gohan and they go on to discover new power - up techniques. It could show her growth as a fighter and how she overcomes challenges.
Their relationship might develop through shared battles. As Bulla grows up, she joins in fights. Vegeta, seeing her determination, starts to respect her more as a warrior, and their bond deepens.
One idea could be exploring the daily life on Planet Vegeta before its destruction. What kind of culture, traditions, and hierarchies existed there? Another could be a story about a Saiyan who was sent away from Planet Vegeta just before its destruction and their journey to return and find out what really happened. Maybe there could also be a fanfiction about the Saiyans' relationship with other races in the universe from the perspective of Planet Vegeta.
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 great Dragon Ball Z Bulla fanfic could be 'Bulla's Adventure'. In this fanfic, Bulla might go on a journey to discover new powers. Another could be 'Bulla and the Time Rift', where she gets involved in time - traveling adventures and meets different versions of the Dragon Ball characters. There are also fanfics that focus on Bulla's relationships, like 'Bulla's New Friend' which could explore her friendship with a new character in the Dragon Ball Z universe.
One interesting storyline could be about a new Saiyan character in the Dragon Ball Z RPG fanfiction. This character might have a unique power that no one has seen before. They could start as an outcast among the Saiyans but then prove their worth during a big battle against a powerful new enemy.
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.
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 storyline could be Gohan's struggle to control his wolf - like instincts while still being a Saiyan. Maybe he has new powers related to his wolf form that he has to learn to master. Another could be him facing off against enemies who are both intrigued and threatened by his unique form.