Show her backstory. Maybe she wasn't always bad. For example, she could have been an outcast as a child because of her love for the moon and her strange powers. This made her bitter over time and led to her becoming a villain.
One idea could be Luna Girl befriending the Pj Masks by accident. Maybe during a full moon, a magical spell goes wrong and she ends up in a situation where she has to rely on them for help. As they work together, she starts to see their side of things.
A really interesting fanfiction could be where Gekko and Luna Girl accidentally switch powers. Gekko now has the power to control moths and fly on the Luna Board, while Luna Girl has Gekko's super - jumping and camouflage abilities. This would lead to a lot of chaos as they both try to figure out how to use their new powers and also deal with their respective friends and foes in the Pj Masks universe. It would be a story full of humor and unexpected twists.
One great idea for a Pj Masks Gekko and Luna Girl fanfiction could be a story where Gekko discovers Luna Girl has a soft side. Maybe he stumbles upon her secretly helping a lost animal in the park one night. This could lead to an unlikely friendship between them, despite their usual 'good vs. bad' dynamic in the show.
To write Luna Girl's character well, you need to understand her motives. She's often portrayed as a villain, but there's more to her. Show her determination in achieving her goals, whether they are bad or not. For instance, when she tries to steal the moon crystals, write about how focused she is.
One idea could be to focus on Luna Girl's backstory. Maybe she wasn't always bad. She could have been a lonely girl who turned to the dark side because she felt excluded. You could write about her early days, her interests before she became the villain we know in Pj Masks. For example, she might have loved astronomy but was mocked for it, and that led to her resentment.
Another fanfiction idea is that Gekko and Luna Girl are both transported to a different dimension. In this new world, they are the only ones who know each other from their own world. At first, they are suspicious of each other. But as they try to find a way back home, they realize that they need to rely on each other's skills. Gekko's ability to befriend creatures and Luna Girl's knowledge of dark magic could be the keys to their escape. This journey could make them see each other in a new light and form an unexpected bond.
One idea for a Gekko and Luna Girl fanfiction could be a story where they accidentally team up. Maybe they both find themselves in a situation where they have to work together to overcome a common enemy, like a powerful new villain in their world. Gekko, with his friendly and positive nature, starts to make Luna Girl see things in a different light, and she begins to question her own villainous ways.
Perhaps in a fanfiction, Catboy and Luna Girl are both from different dimensions. They accidentally cross paths in a third dimension. At first, they are both confused and a bit hostile. But as they learn more about each other's worlds, they start to become friends. They might even decide to help each other find a way back home.
One possible fanfiction could be about Catboy and Luna Girl teaming up for a day. They might find a magical object that forces them to work together to protect it from a common enemy. This would be a really interesting twist as they are usually on opposite sides.
In some fanfictions, Lily Luna Potter in Slytherin might be portrayed as an outcast within her own family's legacy. Since the Potters are mostly associated with Gryffindor, her being in Slytherin could make her feel like she has to prove herself more. She might be depicted as having a more cunning side, using her Slytherin traits to achieve her goals while still maintaining some of the Potter family's good - heartedness.