A cool plot for Chronicles of Narnia crossover fanfiction could be a crossover with Star Wars. The Narnian creatures could be seen as a new species in the Star Wars universe. The Pevensie children might use the Force in a different way, influenced by their Narnian experiences. Or perhaps a crossover with Percy Jackson. The demigods could visit Narnia and have to deal with the different types of magic there. They could also form alliances with the Narnians against common enemies. Another option is a crossover with The Chronicles of Prydain. Since both have a similar Celtic - inspired fantasy setting, the characters could exchange knowledge and skills between the two worlds.
Another plot could involve the Rings of Power in LOTR having some sort of connection to the magic in Narnia. For example, the White Witch might be interested in obtaining the One Ring to increase her power. This could lead to a conflict where the forces of good from both Narnia and Middle - earth have to join together to stop her. The different races in both worlds, such as the hobbits, dwarves, elves in LOTR and the talking animals in Narnia, could interact in unique ways during this conflict.
One interesting idea could be a crossover with a modern - day superhero universe. Imagine the Narnians having to team up with superheroes to fight a common enemy that threatens both worlds. Another idea might be a crossover with a classic fairy - tale world like Wonderland. The different rules and characters from each world interacting would create a really unique and fun story.
One idea could be creating an OC who is a long - lost relative of one of the main Narnian characters. For example, a cousin of Prince Caspian. This OC could bring new dynamics to the story and have their own unique adventures in Narnia. Another idea is an OC who is a powerful wizard from a far - off land in Narnia. They could have different magic abilities compared to the existing characters and use them to help or hinder the protagonists. A third idea might be an OC who is a commoner but has a special gift, like being able to communicate with the animals in a unique way. This could lead to all sorts of interesting plotlines as they interact with the more noble characters in Narnia.
One idea could be that the Golden Trio from Harry Potter somehow stumbles into Narnia. Maybe they're on the run from Death Eaters and a magic portal opens up, leading them to Narnia. There, they could meet the Pevensie children and together, they use their combined magical knowledge and skills to fight against an evil force that threatens both worlds.
One idea could be that the characters from Middle - earth accidentally stumble into Narnia through a magical portal. For example, Aragorn and Legolas could find themselves in the middle of the Narnian forest and team up with the Narnians to fight a common enemy, like an ancient evil that threatens both worlds.
One idea could be to have the characters from Narnia and LOTR meet in a magical realm that exists between their two worlds. For example, Frodo and the hobbits could encounter Aslan. Another could be a story where the One Ring somehow ends up in Narnia and the Narnians have to deal with its corrupting influence, while Aragorn and his companions come to Narnia to help. Maybe the White Witch could team up with Sauron, creating a more powerful and menacing villain for the combined forces of Narnia and Middle - earth to face.
A cool plot could involve a crossover with a modern - day superhero universe. The Kanes use their magic to help the superheroes defeat a villain who has somehow harnessed ancient Egyptian magic. They could teach the superheroes about the different aspects of Egyptian magic and how it can be used against the villain. For example, using the power of Ra to counter the villain's dark spells.
Another possibility is that Voldemort somehow discovers the world of Narnia and tries to conquer it. This would force the Narnian characters to team up with the Order of the Phoenix. Harry Potter and his friends could learn about the talking animals and different forms of magic in Narnia, while the Narnian heroes would see the power of wizardry. It could lead to a great adventure full of battles and new friendships.
Perhaps the Philosopher's Stone somehow gets transported to Narnia. Harry and his friends follow it there. In Narnia, they find that the stone has a different kind of magic which is intertwined with the magic of Narnia. They have to learn about Narnia's magic system while also protecting the stone from the villains in both worlds.
One idea could be that Kane discovers a portal to the Naruto universe and has to learn ninjutsu to survive. He could team up with Naruto and his friends to fight a common enemy like Orochimaru who is interested in Kane's unique powers from his own world.