A time - travel crossover fanfic could also be interesting. Minato travels to different time periods in history or even into the future. In each era, he meets different characters and has to use his Persona skills to adapt and survive. He might even have to face versions of his own Persona in different historical contexts, which could lead to some deep self - discovery.
Another idea is a crossover with a superhero universe. Minato could find himself in a world full of superheroes and villains. He'd have to figure out how his Persona powers work in this new context. Maybe he teams up with some heroes to fight a common enemy, like an evil entity that threatens both his world and the superhero world.
For Minato, you can focus on how he adapts to the new crossover world. His reactions, thoughts, and how he modifies his use of Personas based on the new challenges. For other crossover characters, study their original personalities and find ways to make them interact realistically with Minato. For example, if it's a crossover with a detective character, they might be initially suspicious of Minato's powers.
Maybe Elizabeth discovers a prophecy about Minato and she becomes determined to protect him at all costs. This could lead to a lot of action - packed scenes as well as some really tender moments between them. For example, when she has to shield him from a powerful enemy attack.
One idea could be that Kirby swallows a Persona and gains its powers. This would lead to some really interesting battles and interactions. Kirby could then use the Persona's skills in the Dream Land setting, creating a whole new dynamic.
Another option is a crossover with the Pokémon world. The Phantom Thieves could travel to a region in the Pokémon world and discover that someone is using Persona powers to make Pokémon act out of control. They would need to catch Pokémon themselves and use their combined powers of Personas and Pokémon to stop the bad guy. It would be interesting to see how they interact with Pokémon trainers and the whole Pokémon ecosystem.
A cool plot could involve the Persona 5 crew going back in time to the events of Persona 3. They might end up interfering with some of the original events, which could have unforeseen consequences. For example, they could accidentally change the way a key character in Persona 3 awakens their Persona, and then have to figure out how to fix it while also dealing with the Shadows in that era.
One idea could be to cross it with another popular RPG. For example, having the Persona 4 characters enter the world of Final Fantasy. They could interact with the different races and magic systems there. Another could be a crossover with a detective - themed anime. The Investigation Team could team up with the detectives from that anime to solve a mystery that spans both worlds.
One idea could be to have the Stand users from JoJo interact with the Personas in a battle royale - style scenario. Maybe the JoJo characters are transported to the Persona universe and have to figure out how to use their Stands alongside the Personas to defeat a common enemy.
A great plot could involve the transfer of Personas between the two groups. For example, a character from Persona 3 accidentally gets a Persona that belongs in the world of Persona 4 and vice versa. This causes chaos as they have to learn to control and understand these new entities while also dealing with the reactions of their respective teams.
One idea could be that aliens come to the Naruto world in search of a powerful energy source. Naruto and his friends initially see them as a threat but then realize they can work together. For example, the aliens' advanced technology could help the ninjas in Konoha with things like healing or building defenses. And the ninjas can teach the aliens about chakra and the importance of honor in battle.
The idea of Fortnite characters traveling to other game universes is really creative. For instance, if Fortnite characters go to the 'Minecraft' world, they'll be faced with a completely different building system and environment. Another creative idea is when characters from different movies or shows like 'Back to the Future' enter Fortnite. Marty McFly could use his skateboard skills in the Fortnite map, which would be really cool.