Well, a cool plot might be a time - travel fanfiction in the Miraculous Ladybug universe. Maybe Chat Noir goes back in time and accidentally changes something that affects the present day. Or a story where a new villain discovers the secrets of the Miraculous and uses them in unexpected ways. There could also be a fanfic about the kwamis having more of a say in how the Miraculous are used and it causes some chaos among the heroes.
A great plot idea could be centered around an international Miraculous team. Characters from different countries get Miraculous and have to work together with Ladybug and Chat Noir. This could introduce new powers, new cultures, and new challenges. For example, a Miraculous from a country with a strong martial arts tradition might have a hero with combat - based powers. They could bring in new fighting styles and strategies that Ladybug and Chat Noir would have to adapt to. Also, cultural differences might lead to some misunderstandings and comical situations at first, but eventually, they would all learn to work together as a united front against the villains.
One idea could be exploring what would happen if Marinette and Adrien's identities were revealed earlier. Another could be a story where the Miraculous are lost and the characters have to find them without their powers.
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.
Well, you could write a fanfic where Ladybug and Chat Noir get transported to an alternate universe. In this universe, their roles are reversed, and they have to figure out how to get back to their own world while dealing with the differences. Also, a plot could revolve around a Miraculous that has been lost for centuries suddenly resurfacing, and all the chaos and mystery that comes with it. Maybe a story about Ladybug having to deal with a personal crisis that affects her superhero duties, like losing her confidence after a major defeat.
One idea could be that the Reverser's powers are amplified and he starts reversing not just individual actions but entire relationships in Paris. So, Marinette and Adrien's unspoken bond is reversed, making them avoid each other at all costs. Another could be that the Reverser targets Ladybug's and Chat Noir's memories of their superhero identities, causing chaos as they try to figure out who they are again while still having to fight akumas. A third idea is that the Reverser somehow manages to reverse the concept of good and evil in Paris, making the akumas seem like the heroes and the heroes like the villains, and Ladybug and Chat Noir have to find a way to reverse it back.
A possible plot for the Miraculous Ladybug Glaciator fanfiction is that Glaciator somehow freezes time in Paris, except for Ladybug and Chat Noir. They have to find a way to reverse the time - freeze while also dealing with Glaciator's attacks. Or perhaps Glaciator teams up with another akumatized villain, creating a more difficult situation for our heroes. Also, the fanfiction could explore the relationship between Ladybug and Chat Noir as they are trapped in this frozen - in - time Paris, and how they grow closer or face new challenges in their relationship.
A really cool plot could involve the Puppeteer teaming up with other villains in the Miraculous Ladybug universe. They could form a sort of 'villain alliance' and plan a major attack on Paris. The heroes would then have to figure out how to break their alliance and defeat them. Also, perhaps the Puppeteer discovers a way to use the Miraculous powers for herself without having a Miraculous, which would be a huge threat to Ladybug and Chat Noir.
One idea could be Chloe's redemption arc in a fanfic. Maybe she starts to realize the error of her ways after a particularly harsh event. For example, she could lose her status among her peers and have to start from scratch to earn their respect. Another plot could be Chloe getting a new Miraculous and learning what it really means to be a hero. She might struggle at first with the responsibilities but grow into a great hero over time.
Another plot could involve an OC from a different country who comes to Paris with a Miraculous. This OC has different fighting styles and cultural beliefs that add new elements to the story. They could teach Ladybug and Chat Noir about their own Miraculous lore.
For a Miraculous Ladybug Evillustrator fanfiction, a great plot could be that Evillustrator is framed for a crime he didn't commit by another villain. Ladybug and Chat Noir initially believe he is guilty but then start to suspect otherwise as they notice strange things happening. They then have to work with Evillustrator to clear his name and stop the real villain. Another idea is that Evillustrator discovers a hidden talent within his drawing ability that can be used for good, like creating portals to different dimensions that could help Ladybug and Chat Noir in their battles. And there could be a plot where Evillustrator creates a drawing of an ideal Paris, but it starts to replace the real Paris, and Ladybug and Chat Noir have to save the city from this artificial utopia.
One idea could be that Ladybug and Chat Noir have to babysit a group of akumatized kids and they use their powers in creative ways to keep the kids entertained and safe. For example, Ladybug could use her yo - yo to create fun games like a makeshift swing.
One idea could be exploring Robustus's backstory in more detail. Maybe he had a difficult past that led him to become a villain. Another plot could involve him forming an unexpected alliance with the heroes. For example, a common enemy forces them to work together. And a third idea is a story where Robustus tries to reform and find a new purpose in life.