One idea could be exploring how the 'Bad Bug' version of the character interacts with the normal Miraculous Ladybug world. Maybe they cause chaos in different ways than the regular villains.
In some fanfictions, the Bad Bug might team up with the villains. This could completely change the dynamics of the story. The heroes would then have to face a much more difficult situation. They would not only have to deal with the regular villains' schemes but also with the Bad Bug's unpredictable actions. Also, the Bad Bug could have a different backstory that led them to become this 'bad' version, like a past betrayal or a misinterpretation of their powers, which could be explored in the fanfiction.
Well, perhaps in the fanfiction, the Bad Bug has some unique powers that are different from the regular Ladybug. This could lead to really cool battles and power struggles. For example, instead of using the power of creation in a positive way like the normal Ladybug, the Bad Bug uses it to create obstacles and problems for the heroes. And it could also be interesting to see how the other characters in the Miraculous Ladybug universe react to this new, darker version of Ladybug.
Well, you could have a fanfiction where Ladybug loses her Miraculous and has to rely on her wits and the help of her civilian friends to get it back. Maybe there's a plot where Chat Noir gets corrupted by an evil force, and Ladybug has to find a way to save him without using their usual powers. Also, a story where the Miraculous holders swap their powers permanently and have to adapt to new fighting styles and abilities.
One idea could be a story where the Peacock Miraculous has a unique malfunction that causes it to create unexpected akumas. For example, instead of creating the usual villains, it creates akumas that have the power to spread positive emotions but in a chaotic way that still disrupts Paris. Another idea is a fanfiction where the holder of the Peacock Miraculous has to team up with Ladybug and Chat Noir to fight against an ancient evil that is specifically drawn to the power of the Peacock. This could involve exploring the history of the Miraculous and its connection to this new threat.
Obviously, the Bad Bug would be one of the main characters. And probably the regular Ladybug and Chat Noir too, as they would be the ones to oppose the Bad Bug.
One idea could be Multimouse having to team up with an unexpected ally, like a villain who has a change of heart for a short time. Another could be Multimouse getting lost in an alternate dimension and having to find her way back while facing new challenges.
One idea could be Ladybug and Chat Noir having a heart - to - heart conversation in bed after a particularly tough battle. They could share their fears and insecurities that they usually hide behind their superhero personas.
One idea could be a story where the child of Ladybug and Chat Noir discovers their parents' secret identities by accident. Maybe they find a hidden Miraculous box in the attic and start to figure out what it means.
For a Miraculous Ladybug class fanfiction, a plot about a cursed object in the classroom could be interesting. The object spreads negative energy, causing the students to fight and argue more. Ladybug and Chat Noir suspect that it's an akuma - related thing, but they can't find the akuma. As they investigate, they discover that it's actually an ancient cursed item that was accidentally brought into the class. They have to find a way to break the curse without revealing their identities, and also deal with the fact that their classmates' relationships are falling apart because of the curse.
Maybe there's a werewolf akuma. Hawkmoth takes advantage of an already existing werewolf in the city and akumatizes it. This werewolf - akuma has enhanced powers and is causing chaos. Ladybug and Chat Noir must figure out how to defeat it. They might need to discover the true identity of the werewolf to break the akuma's hold. It could be a person who was bitten recently and is struggling to control their new form.
Another plot could be that a crime wave hits Paris, and all the evidence points to Chat Noir as the perpetrator. Ladybug is torn between believing in her partner and the mounting evidence against him. She has to dig deeper into the case to find the real criminal who is framing Chat Noir and clear his name.
One idea could be that Ladybug and Chat Noir are sent to space on a mission to stop an alien villain who is stealing energy from planets. They have to adapt to zero - gravity combat and use their powers in new ways. For example, Ladybug's yo - yo could be used to grapple onto spaceships.