A possible plot idea is a time - travel fanfiction within the Frozer context. What if Ladybug or Chat Noir accidentally travels back to a time before the events of Frozer? They could try to change things to prevent the akuma attack or improve their relationship. Or perhaps they get stuck in a time loop of the Frozer events, having to relive it over and over until they figure out how to break free. Also, a plot where the akumatized Frozer character has a change of heart on his own without Ladybug and Chat Noir having to defeat him could be interesting.
One idea could be exploring the emotional turmoil of the characters in the Frozer episode from a different perspective. For example, focusing on Chat Noir's feelings when Ladybug rejects his romantic advances more in - depth. Maybe he starts to question his role in their relationship and how much he can endure. Another plot could involve a new villain emerging during the events of Frozer, one that is related to the ice - skating rink setting. This villain could use the cold environment to their advantage and create new challenges for Ladybug and Chat Noir.
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.
An ice - sculptor who has the ability to bring his sculptures to life in the fanfiction. He could be an ally or an accidental hindrance. If he's an ally, he could create ice sculptures that act as barriers or weapons against the Frozer - like villain. If he's a hindrance, his sculptures could accidentally block Ladybug and Chat Noir's path or be used by the villain to their advantage. He would add a new dynamic to the story with his unique power.
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.
A plot could involve the whole gang from Miraculous Ladybug going camping together. Marinette could be worried about Tikki being discovered in the wild. Meanwhile, Adrien, as Chat Noir, tries to impress Marinette. And during the camping trip, there's a mystery about a strange light in the forest that turns out to be related to an ancient Miraculous. So they all have to work together to figure it out.