One idea could be a time - travel plot. For example, Ladybug and Cat Noir are sent back in time to when the Miraculouses were first created. They have to figure out how to get back to their own time while also protecting the secrets of the Miraculouses in the past. Another idea is a role - reversal. Maybe Ladybug loses her powers for a short time and Cat Noir has to step up even more and take on some of her traditional responsibilities. He could struggle with the different approach needed for leadership.
A cool plot for a Ladybug x Cat Noir fanfic could be an alternate universe where they are not heroes but ordinary students who discover the Miraculouses by accident. They then have to learn how to use their powers while also dealing with normal school life, like exams and bullies. Also, a plot where they are trapped in a dream world created by an akuma. In this world, everything seems normal at first, but they start to notice strange things and have to find a way to break free and defeat the akuma in the real world.
One idea could be a fanfic where Ladybug and Cat Noir get trapped in an alternate dimension. They have to work together in new and strange ways to find a way back home. Another could be a story where their identities are revealed to each other accidentally, and they have to deal with the new dynamic between them. Maybe a fanfic where they have to team up with some of the akumatized villains to fight a greater threat.
One idea could be a story where Ladybug and Cat Noir get trapped in an alternate dimension. They have to figure out how to work together in this strange new world to find a way back home. They might encounter new villains or versions of their friends that are very different.
Well, a great plot for Miraculous Ladybug and Cat Noir fanfiction could be an alternate universe where they are not superheroes but normal students. However, they start to notice strange things happening around them that seem related to the Miraculous. They then have to find a way to regain their powers or discover new ones to save the day. Also, a story where they get trapped in a villain's illusion world and have to fight their inner demons while trying to break free. Or perhaps a fanfiction where they have to deal with a new villain who can copy their powers and they have to find a way to outwit this new threat.
One idea could be a time - travel plot. For example, Ladybug and Cat Noir are sent back in time to the origin of the Miraculouses. They have to figure out how to get back while also ensuring the Miraculouses are created and end up in the right hands. This would involve interacting with the past holders and solving ancient mysteries related to the powers.
One idea could be that Cat Noir and Ladybug get transported to an alternate Paris where the roles of heroes and villains are reversed. They have to figure out how to adapt and set things right. Another could be a time - travel plot where they go back in time to prevent Hawkmoth from ever getting his hands on the Miraculous in the first place. And a third idea is that there is a new villain who can manipulate emotions, and Cat Noir and Ladybug have to not only fight the physical battles but also the emotional turmoil this villain causes among the citizens.
One interesting crossover could be a scenario where the members of OHSHC somehow end up in the world of Ladybug and Cat Noir. Maybe they get mistaken for akumatized villains at first due to their flamboyant outfits. For example, Tamaki could be mistaken for a new super - villain because of his princely and somewhat over - the - top appearance. Then Ladybug and Cat Noir would have to figure out that they are just normal (well, as normal as the OHSHC crew can be) people from another dimension. This would lead to a lot of comical misunderstandings and eventually a team - up to fight a real villain.
One idea could be that when they switch miraculouses, Ladybug has to deal with Cat Noir's carefree and flirty attitude while in his form. She might struggle to adapt to his more laid - back fighting style. Another could be that Cat Noir, now as Ladybug, has to be more strategic and organized, which is a big change for him. He could also have a hard time with the more feminine aspects of the Ladybug costume and powers at first.
One idea could be that Tom discovers the secret identities of Ladybug and Cat Noir. He could then get involved in helping them protect Paris in his own unique way, like using his baking skills to create special treats that give them extra energy during battles.
One idea could be exploring what would happen if Ladybug and Cat Noir's identities were accidentally revealed to their families. It would add a whole new layer of drama and family involvement in their superhero lives.
Well, a common fanfiction idea is to give the characters new powers or challenges. Maybe Ladybug has to deal with a new type of akuma that nullifies her usual powers. Or Cat Noir has to face an enemy alone without Ladybug's help. Also, there are fanfictions that play with the idea of the characters' identities being revealed in unexpected ways, which then leads to a whole new set of problems and solutions for them.