There could be a fanfiction where Caway forms an unexpected alliance. For example, she teams up with a villain who later turns out to have a change of heart, and together they face a greater evil. This would show a different side of her character in terms of her ability to judge and trust others. Also, it could explore how their combined powers work in different situations.
One interesting story could be about Caway's hidden powers. Maybe she discovers she has a unique ability that can change the course of a big battle in the Dragon Ball Super universe.
Another good option could be Whis. Whis is very knowledgeable and powerful. Pairing him with Caway would allow for some really cool storylines. He could train Caway in the ways of the angels, and Caway could bring a fresh and different energy to Whis's rather calm and collected world.
One interesting story could be about a new Saiyan character introduced in the fanfiction. This Saiyan might have a unique power that even Goku and Vegeta are intrigued by. Maybe they train together to unlock new levels of Super Saiyan forms.
There are fanfictions that focus on the relationships between the characters. For example, a story where Vegeta has to team up with Frieza in an alternate universe to fight a common enemy stronger than both of them. This forces Vegeta to put aside his hatred and work with his old foe, creating an interesting dynamic.
A great fanfiction idea is a fusion of the power systems. For example, a story where characters can combine chakra and ki. Naruto could try to use ki - enhanced rasengan or Goku could use a chakra - based Kamehameha. It would be an exciting exploration of both universes' power concepts.
Another great 'Broly Dragon Ball Super Fanfiction' could revolve around Broly's past on Planet Vegeta. What if there were more secrets about his family? Maybe he had a sister or a brother who was also extremely powerful but was lost during the destruction of the planet. This fanfiction could explore Broly's search for his lost family member while still dealing with the threats in the present universe.
One interesting story could be about a new villain who forces Goku to reach the SSJ4 form in a completely different way. Maybe he has to combine his Saiyan powers with some ancient energy source on a new planet. Another could be a fanfiction where Vegeta finally masters the SSJ4 form before Goku and has to face a powerful foe alone.
A great fanfiction could be Whis falling in love with a new character. This new character might be a powerful being from a different galaxy. Their relationship would bring a whole new dynamic to the story. Whis would have to balance his duties as an attendant to Beerus with his new - found feelings. Also, there could be a story where Whis creates a new form of training for Vegeta that helps him finally surpass Goku in power, which would be a huge twist in the Dragon Ball Super narrative.
One idea could be a story where Goku and Vegeta from Dragon Ball Super end up in the world of Dragon Ball GT by some sort of time - space rift. They then have to team up with the GT versions of themselves to fight a new, powerful enemy that is threatening both timelines.
One interesting fan theory is about the potential hidden powers of some minor characters. For example, some think that Yajirobe might have a secret super form that was never revealed in the original series. It's just a fun idea that fans like to explore in fanfiction.
In Dragon Ball Super Super Saiyan 4 fanfiction, often there are concepts about alternate universes. Picture a universe where Super Saiyan 4 is the norm rather than an extreme form. This could lead to different power hierarchies and battles. Additionally, some fanfictions explore the idea of Saiyan - human hybrids achieving Super Saiyan 4 in unique ways, perhaps with abilities that are a blend of human ingenuity and Saiyan strength.