One possible fanfiction could be about Vegeta's attempts to balance his training with family life. He might struggle to find time for Bulma and their family while also trying to keep up with the threats in the Dragon Ball Super universe. For example, he could be training for a new powerful enemy, but Bulma wants him to be more present at home. So he has to find a way to make both work.
One great fanfiction idea could be that Vegeta takes Bulma on a special training trip. He wants to show her the different planets he has trained on. This would be a unique adventure for them both, allowing Bulma to see the vastness of the universe Vegeta has experienced. It would also strengthen their relationship as they face various challenges together during the journey.
One common theme is power. Combining the magical powers from Harry Potter and the physical and combat - related powers of Saiyajin. Another theme could be about identity. How a character from one universe adjusts to the rules and culture of the other. For instance, a Saiyajin in Hogwarts trying to understand magic while still maintaining their Saiyajin nature.
Well, it depends on what you consider interesting. There are some 'Harry Potter Saiyajin fanfiction' out there. Some might focus on a crossover where a Saiyajin character ends up in the Harry Potter universe, perhaps with their super strength and unique abilities causing all sorts of chaos or helping in the fight against the dark forces. Others could be more about a Harry Potter character somehow gaining Saiyajin powers. However, the quality can vary a great deal from one story to another.
The plot could be about Bulma getting kidnapped by a new villain. Vegeta goes on a rampage to find her. He battles through hordes of minions until he finally reaches the villain's lair. There, he has an epic battle and rescues Bulma. Afterward, he realizes how much he truly loves her and vows to protect her better.
It could be a genetic mutation in the fanfic's storyline. Some strange event or factor could have caused a change in Bardock's genes, making it possible for him to become Super Saiyan. This genetic change might be related to some ancient Saiyan lore or a new element introduced in the fanfic's universe.
In certain fanfictions, Vegeta may have received a special power - up or training that gives him an edge over Frieza. He could use his speed and agility to dodge Frieza's attacks and then counter - attack. Vegeta might perform a series of rapid - fire punches and kicks, weakening Frieza. Finally, he could use his Final Flash technique with all his might, completely obliterating Frieza. Fanfiction often takes creative liberties to show the growth and capabilities of characters like Vegeta against a long - time foe like Frieza.
One interesting plot could be a time - travel related one. Vegeta and Bulma accidentally get sent to the past. There, they have to deal with the different versions of their friends and enemies. They also have to find a way to get back to their own time while not disrupting the timeline too much. This would be full of adventure and also explore their relationship in a different historical context.