One idea could be a story where the heroes from different Jump universes are forced to team up against a new, unseen threat that can manipulate the very fabric of their worlds. For example, a villain who can erase characters' powers or change their personalities.
One idea could be a story where the heroes from different Jump universes have to team up against a new, unknown threat that is slowly corrupting their worlds. Another could be a character - driven story focusing on a minor character from one of the Jump series and their journey through the chaotic world of Jump Force.
A third idea is a time - travel crossover. The Glitter Force could be sent back in time to when their predecessors first fought against an ancient evil. There, they must learn from the past and use the knowledge to prevent a recurrence of the same threat in their own time. They could also form unexpected alliances with the earlier Glitter Force members and discover new aspects of their own powers along the way.
Well, a cool plot for an MLP Battle Force 5 fanfic could be that there's a strange energy wave that disrupts both the MLP world and the Battle Force 5 world. The ponies and the Battle Force 5 members start having strange abilities or problems because of it. They then have to figure out the source of this energy wave, which leads them on an adventure across both worlds. Along the way, they learn about each other's cultures and strengths, and in the end, they manage to stop the energy wave and become friends. It could also involve some of the ponies learning to drive the Battle Force 5 vehicles in a really funny way.
One idea could be exploring the backstory of Rey before she was found on Jakku. Maybe she had some secret training as a child that she's forgotten. Another is delving deeper into Finn's struggle with leaving the First Order. He could have some internal conflicts about his past comrades.
One idea could be a crossover with a detective from another popular crime show. They could team up to solve a complex case that spans across different cities or even countries. The clash of their different investigative styles would create interesting dynamics.
In a PLL time jump fanfiction, it could be that Spencer has become a detective. When a series of murders start happening in Rosewood again, she calls the other Liars back. They struggle to adapt to the old town and the new danger, while also dealing with their past traumas.
One interesting storyline could be an OC (Original Character) with a unique power from a different world getting thrown into the Jump Force universe and having to team up with classic Jump characters like Goku and Naruto to fight a new, powerful enemy. This allows for a fresh take on the crossovers we already know.
One idea could be exploring an alternate universe where the Battle Force 5 team has different powers or vehicles. For example, instead of their regular rides, they could have flying saucers with unique offensive capabilities.
A possible plot for Danger Force fanfiction is that there is a power outage in Swellview that affects all the high - tech gadgets and powers of the Danger Force. They have to rely on their wits and basic physical skills to fight off a group of villains who take advantage of the situation. Another idea is that a mysterious force starts to make all the supervillains in Swellview team up. The Danger Force has to figure out what is causing this alliance and break it up before the villains launch a major attack on the city. And for a more character - focused plot, one of the Danger Force members starts to doubt their place on the team after making a big mistake during a mission. The rest of the team has to help them regain their confidence and prove that everyone makes mistakes and they are still an important part of the team.
One idea could be to explore an alternate universe where the characters have different powers. For example, Geo could have the power to control time instead of EM waves. Another idea is to focus on a new villain that is more powerful and complex than the ones in the original. This villain could have a backstory that makes the readers sympathize with them a bit. Also, a fanfic could be about the characters' daily lives outside of their battles, like Geo's school life and how his friends interact with him there.