Another plot could involve a crossover with a space - faring civilization. The people from Into the Badlands are abducted by an alien race. They have to use their fighting abilities to escape and find their way back home. In the process, they might learn about advanced technologies and how to incorporate them into their own fighting styles.
One idea could be to cross it with a post - apocalyptic zombie world. The characters from Into the Badlands have to fight both zombies and their usual foes. They could use their martial arts skills in new ways, like using katana to slice through hordes of zombies.
Another plot could involve Naruto being mistaken for a powerful warlord in the Badlands. He has to play along at first to avoid trouble but then tries to use this false identity to bring peace and order to the chaotic land. He could start by uniting the different warring tribes through his charisma and ninja abilities.
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.
Another plot could involve a crossover with the Punisher and the X - Men. Frank Castle might find himself in a situation where he has to work with mutants. He could initially be distrustful but then realize they are fighting for a similar cause against a common enemy that is targeting both humans and mutants. For example, a group of anti - mutant and anti - vigilante fanatics.
One idea could be a crossover with Peter Pan. Tinkerbell could meet characters from another world, like Alice from Wonderland. She might be confused by the strange rules and creatures there, and her magic could interact in unexpected ways with the Wonderland magic.
Another plot could involve a crossover with a post - apocalyptic world. The Boys find themselves in a world where society has collapsed, and they have to team up with the survivors against new threats. This could bring out new sides of the characters as they are forced to adapt to a completely different environment and face challenges they've never faced before.
One idea could be to cross over the characters from 'Percy Jackson and the Olympians' with those from 'The Kane Chronicles'. For example, the demigods and the magicians could team up to fight a common enemy that threatens both the Greek and Egyptian mythological worlds. Maybe a new dark force that has the power to disrupt the balance between the two realms.
One idea could be a crossover with Minecraft. The Terraria characters could find themselves in a Minecraft world filled with blocky landscapes and different mobs. They would have to adapt to the new building mechanics and find ways to combine their own abilities with the resources available in Minecraft.
Maybe a crossover with a group of time - traveling scientists. They accidentally bring the Indoraptor to their time and have to figure out how to send it back while avoiding being hunted. This could involve a lot of scientific jargon and problem - solving. For example, they might need to study the Indoraptor's DNA to find a way to open a time - travel portal that it can go through. And along the way, they could learn more about the Indoraptor's behavior and how it evolved in its own time period.