A third common theme is the exploration of new magical adventures. Writers of fanfiction love to send Harry and Lucy on quests that neither of them could have had in their original stories. These adventures might involve exploring new magical lands that are a blend of Narnia and Hogwarts - like settings, or encountering strange and powerful magical creatures that are a combination of the ones from both series. This theme adds an element of excitement and novelty to the fanfictions.
One common theme is the clash and combination of different magical systems. Since Harry comes from the wizarding world of spells and potions and Susan has her Narnian magic, their fanfics often explore how these two types of magic interact. Another theme is friendship. They are from different fictional universes, so when they meet, their developing friendship is a big part of the story.
The theme of friendship across different worlds is also prevalent. Harry and Peter, coming from different fictional universes, form a bond in fanfictions. This friendship often becomes a powerful force against any threats they face together, and it also helps them understand each other's cultures and values better.
One common theme is family dynamics. Since she's seen as a little sister, there are often stories exploring her relationships with her siblings in more depth, like how they protect her or how she tries to prove herself to them. Another theme is growth. Lucy might be portrayed as growing up in Narnia, learning more about the magical world and her place in it as a little sister.
Well, I've read a fanfic called 'Alliances Beyond Worlds'. In this story, Lucy's courage and Harry's determination blend together beautifully. It starts with Lucy accidentally stumbling into Hogwarts through a portal. Harry, being the curious and brave boy he is, decides to help her find her way back home, and along the way, they discover some really cool magical secrets that combine elements from both Narnia and the wizarding world.
Another theme could be relationships. There may be new dynamics in her friendships, like with Hermione and Ron. Maybe Lucy develops a different kind of bond with them as a female. Also, in terms of romantic relationships, it could be interesting to see how her love interests change or how she approaches love in this new identity. And then there's the theme of facing challenges in a different way. As a female, she might face different types of discrimination or advantages in the wizarding community, and the fanfiction could explore how she overcomes or uses these situations to her advantage.
The theme of redemption can also be found. Sometimes an original character has made mistakes in the past and through their interactions with Peter, they seek redemption. Additionally, the theme of family is there. Even though the original characters are new, they often become part of Peter's 'family' in Narnia, and they learn the importance of family bonds and loyalty.
One common theme is the exploration of identity. Since Edmund is male in the original and now being female in the fanfiction, there's a lot of self - discovery about what it means to be Edmund in a different gender. Another theme is relationships. How does a female Edmund interact with the other characters like Peter, Susan, and Lucy? It often shows different dynamics.
One common theme is redemption through pain. Edmund has a past of making mistakes, and in hurt fanfiction, his suffering can be a way of atoning and growing. Another theme is the strength in vulnerability. When he's hurt, it shows his human side and how he can still be strong. For example, in some fanfictions, after getting injured in a battle, he continues to fight for Narnia.
There's also 'Lucy's Secret Journeys'. In this fanfiction, Lucy discovers a hidden power within herself and Peter has to help her control it. It's full of emotional moments and great character development. The author does a wonderful job of staying true to the original characters while adding new twists.
Websites like Archive of Our Own (AO3) are great places to start. It has a large collection of fanfiction, and you can easily search for 'Harry Potter' and 'Peter Pevensie' crossovers. There are filters to help you find the most popular or recently updated ones.