Befana can be a magical helper. In fanfiction, she often uses her powers of flight and gift - giving to assist Ladybug and Chat Noir. For example, she might give them a magical item to defeat a particularly tough akuma.
Some Befana fanfictions focus on her backstory in relation to the Miraculous Ladybug world. For example, there's a story that delves into how Befana came to know about the Miraculous and her connection to the ancient magic that might be related to the Miraculous powers. It gives a whole new perspective on the character and the overall lore of the show.
Well, Ladybug could be seen as a new type of Gem. Her powers are magic - based, similar to the powers of the Gems. She might be mistaken for a powerful new Gem at first. Cat Noir could be like a fusion of sorts, with his cat - like abilities and charm. He could team up with Amethyst, for example, as they both have a bit of a wild side.
One idea could be a crossover where Ladybug and Cat Noir end up in the world of Steven Universe. They could team up with Steven and the Crystal Gems to fight a common enemy that has the power to disrupt both their universes.
This event in the fanfic could also lead to new characters emerging. Maybe someone would try to take on Ladybug's mantle in a different way. Or new villains could rise, seeing the opportunity in the chaos. The magic of the Miraculous might be affected too. Since Ladybug was an important part of the magical balance, her death could have unforeseen consequences on the powers and the Miraculous themselves.
Tikki and Plagg could have interesting roles too. Tikki, being the kwami of creation, could help Marinette come up with ways to interact with the Phantom and the other characters in the Phantom of the Opera world. Plagg, on the other hand, might be a bit more mischievous. He could accidentally cause some chaos that either makes the situation more difficult or surprisingly helps in some way. For instance, he might steal the Phantom's mask as a joke, which could lead to a whole new set of events.
Well, perhaps she's a mentor figure. Since she has a lot of experience in the superhero/villain world in the Marvel universe, she could teach Ladybug and Chat Noir new fighting techniques and strategies to outwit their enemies.
Ladybug and Chat Noir are still very popular, even in alternate universes. Their dynamic is so iconic that writers like to explore different versions of it. Marinette and Adrien are also popular as they are the alter - egos. But other characters like Luka and Kagami are also getting more attention in alternate universe fanfictions. Luka, for example, might be given a more prominent role as a Miraculous holder or a key figure in a different plotline.
Well, in some Miraculous Ladybug Alternet Universe Fanfiction, there are concepts like the Miraculous having different origins. Instead of being created by the Kwamis' magic in the traditional way, they could be the result of a scientific experiment gone wrong. This would change the nature of how the heroes interact with their powers. And then there's the idea of a 'dark' Ladybug or Chat Noir. Maybe they've been corrupted in some way and are now fighting against the good guys, which would be a really cool and edgy take on the story.
In an akumatized Ladybug fanfiction, the akuma might enhance her powers in unexpected ways. For example, her Lucky Charm could become a more powerful and unpredictable object. Her akumatized form might also have a darker and more menacing look, perhaps with a more aggressive fighting style. Writers could explore how the heroes and villains interact with this changed Ladybug.
Well, Marinette could be like Belle in a sense. She's kind - hearted and intelligent. She might be the one to see past the Beast's exterior, just as she often sees the good in people in the Miraculous Ladybug world. And Chat Noir could be a sort of sidekick to her in this new story, using his cat - like agility to help in the Beast's castle.