One common theme is the exploration of different magical systems. Since both Narnia and Harry Potter have their own unique forms of magic, fanfictions often compare and contrast them. For instance, the magic in Narnia is more closely tied to the will of Aslan and the natural order of the world, while in Harry Potter it's more about spells and potions.
One interesting crossover could be the characters from Harry Potter visiting Narnia. For example, Harry, Ron, and Hermione might find themselves in Narnia through some magical accident. They could then interact with the talking animals and magical beings there, like how they interact with the magical creatures in their own wizarding world. Maybe they would help the Narnians in a battle, using their unique Hogwarts - taught magic.
One unique feature is the combination of different magical systems. The magic in Harry Potter is more about spells and potions, while Narnia has its own brand of magic like the power of Aslan. In the fanfiction, these two types of magic interact in new and exciting ways.
One common theme is the exploration of different magic systems. Since both series have their own unique magic, fanfictions often compare and combine them. Another theme is friendship. Just like in the original works, characters from both universes form bonds in the fanfictions. Also, the battle between good and evil is a recurring theme, as it is central to both 'Harry Potter' and 'Chronicles of Narnia'.
I've read 'The Enchanted Alliance' which is a fem Harry Potter Queen of Narnia fanfic. It's really cool because it combines the two magical worlds in a unique way. The female Harry Potter character is really strong - willed in this one. She quickly learns the ways of Narnia and starts to influence the events there. There are also some really exciting battles where she uses her magic skills from Hogwarts. It's a story full of adventure and magic that keeps you hooked from start to finish.
Friendship is also a major theme. In these fanfictions, the fem character usually makes new friends in Narnia. They work together to overcome difficulties, just like in the original Harry Potter series. These new friendships are often crucial in helping the character understand the new world and also in her own personal development.
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.
Hermione and Lucy are often popular to pair. Hermione's intelligence and knowledge of magic could complement Lucy's kind - hearted and brave nature. They could go on adventures together, with Hermione using her logical thinking and Lucy's intuition to solve problems.
I like 'Narnian Wizards at Hogwarts'. In this fanfiction, the magic of Narnia and that of Harry Potter are compared and contrasted. It shows how different yet similar they can be. The plot often involves the Narnian characters trying to adapt to the rules and lifestyle in Hogwarts while also teaching the Hogwarts students about their own kind of magic.
One interesting crossover could be the characters from Hogwarts finding a magical portal to Narnia. They might be amazed by the talking animals and the different magical rules there. For example, Harry could use his magic skills to help the Narnians in a battle against the White Witch.