In many such fanfictions, a plot could be that the arranged marriage is arranged by a magical entity. Maybe it's an old kwami who believes that uniting these two particular holders of the Miraculous through marriage will bring balance to the world. So the two main characters, like Marinette and Adrien perhaps, have to navigate this strange situation. They might be hesitant at first but then start to see the potential benefits not just for themselves but for the greater good. This could involve them working together more closely as superheroes and as a couple in the arranged marriage, which in turn helps them defeat villains more effectively.
Adrien and Marinette are definitely one of the most popular pairings. Their relationship in the original show already has a lot of chemistry, and in arranged marriage fanfictions, it adds a whole new layer of complexity. Another popular pairing could be Kagami and Adrien. Given Kagami's more traditional upbringing, an arranged marriage scenario seems more likely for her character, and fans like to explore how she and Adrien would handle such a situation. There's also the pairing of Marinette and Luka which some fans might explore in an arranged marriage context, especially since Luka has such a calm and understanding personality which could be interesting in an arranged marriage dynamic.
One common plot is Alya using her Volpina powers to help Ladybug and Chat Noir without them knowing her true identity at first. It adds an element of mystery and secrecy to the story.
In some 'Miraculous Ladybug Rejection Fanfiction', there's the plot of the superheroes being rejected by their mentors. Imagine if Master Fu were to reject Ladybug and Chat Noir for some reason, like he thought they were misusing their powers. This would force them to prove themselves worthy again, and they would have to re - evaluate their actions and relationships within the superhero world.
One way to fake a marriage could be having the characters stage a big fake wedding ceremony with all the trimmings. And they'd have to keep up the act in front of friends and family. Maybe they even have to deal with unexpected challenges that threaten to expose the truth.
One interesting plot could be an alternate universe where Ladybug and Chat Noir have different powers. Maybe Ladybug has the power of ice instead of her usual creation abilities. Another plot could be a time - travel story where they go back to the very beginning of Hawk Moth's reign and try to stop him before he becomes too powerful. And there could also be a story where Ladybug and Chat Noir have to team up with their civilian selves to solve a mystery.
Well, one interesting plot could be about Ladybug and Chat Noir having to face a villain who can manipulate time. This would put their skills and relationship to the test as they try to outwit the baddie and protect Paris. Another plot might involve a new Miraculous holder emerging and how they interact with Ladybug and Chat Noir, whether it's as an ally or a potential adversary.
A common plot is the jealousy - driven bullying. As we know, Marinette is very talented in fashion and is also kind - hearted. So, other characters who are jealous of her might start to bully her. For instance, they could make fun of her clumsiness which is just a part of her charm. Another plot is the bullying related to her secret identity. If someone suspects that she is Ladybug, they might try to bully her to get information or just to mess with her.
One common plot could be that Ladybug and Chat Noir start secretly dating while still maintaining their superhero personas in public. They might meet up on rooftops after patrols and share sweet moments, like having a picnic under the moonlight while keeping it a secret from their friends and allies. Another plot could involve a new villain finding out about their relationship and trying to use it against them.
Another plot could involve the whole of Paris falling into a deep sleep because of an akuma's power. Ladybug and Chat Noir have to fight this akuma while also being affected by the sleepiness. Ladybug's Lucky Charm could be something related to waking people up, like a magical alarm clock. And throughout the battle, they have to overcome their own drowsiness and find a way to break the akuma's spell on the sleeping city.
One interesting plot could be an alternate universe where the Miraculous holders have different powers. For example, Ladybug might have the power of ice instead of her usual abilities. Another could be a story where the villains and heroes have to team up to face a greater threat. This would change the whole dynamic between them.