One plot could be that on Halloween, there is a portal that opens to a parallel Paris that is full of magical creatures from different mythologies. Ladybug and Chat Noir are pulled into this parallel world. They meet a centaur who tells them that if they don't find a way to close the portal, the two worlds will merge and chaos will ensue. Hawkmoth also enters this parallel world and teams up with some of the darker creatures. Ladybug and Chat Noir must make alliances with the friendly creatures and use their powers in new ways to stop Hawkmoth and close the portal.
Maybe on Halloween, all the past akuma victims are turned into real monsters again due to a special spell. Ladybug and Chat Noir not only have to deal with these revived monsters but also find out who cast the spell. They discover that it's an old witch who was once a powerful magician in Paris but was forgotten. She wants revenge on the city for being forgotten. Ladybug and Chat Noir must find a way to break the spell and defeat the witch. Along the way, they also have to deal with Hawkmoth trying to take advantage of the chaos.
On Halloween, Ladybug and Chat Noir found themselves in a very different Paris. The city was transformed into a ghostly realm. People were scared and hiding in their homes. They discovered that Hawkmoth had teamed up with a powerful Halloween spirit. This spirit was creating illusions and making it difficult for Ladybug and Chat Noir to fight. Ladybug had to come up with a new plan. She used her creativity to find a weakness in the spirit's magic. Chat Noir provided the distraction. Together, they were able to break the alliance between Hawkmoth and the spirit and restore Paris to normal.
Well, it could be about Ladybug and Chat Noir finally revealing their identities to each other and having to deal with the consequences. Maybe they face a new, more powerful villain that is a threat to all of Paris and they have to use their combined powers in new ways.
One possible plot for a Miraculous Ladybug beach fanfiction is that Hawkmoth sends an akuma to the beach during a big surfing competition. Chat Noir is there to compete, and Ladybug has to show up and they end up having to fight the akuma while also trying to protect the civilians at the beach. They could also have some cute beach - themed banter in between the fight scenes.
One possible plot could be that the peacock miraculous has a new holder. This new holder might be a bit of an anti - hero at first. They could use the peacock's powers to create sentimonsters for their own gain, like stealing valuable items. But as the story progresses, they start to see the harm they're causing and slowly turn towards the side of good, joining Ladybug and Chat Noir in their fight against Hawk Moth.
Well, it's unique because it flips the whole concept of Ladybug on its head. Instead of being the hero, she's the criminal. It goes against the normal narrative we know from the show.
One idea could be that Ladybug and Cat Noir are transported to a pirate - themed alternate dimension. There, they have to find a magical pirate treasure that holds the key to getting back home. Another plot could involve a pirate who discovers a Miraculous and starts causing chaos in the pirate world, so Ladybug and Cat Noir must team up with a group of good - hearted pirates to stop him.
One possible plot could be that Jagged Stone discovers the true identities of Ladybug and Cat Noir. Maybe he gets involved in one of their battles accidentally and then becomes determined to help them keep their secret identities safe while also using his fame to distract Hawkmoth.
The fanfiction could center around a new student who is secretly a villain in disguise. They try to disrupt the school play which is about the Miraculous Ladybug and Chat Noir's adventures. Ladybug and Chat Noir have to figure out who the new student really is and stop their evil plan before the play is ruined.
One possible plot could be that Ladybug and Cat Noir, in their civilian forms Marinette and Adrien, have a sleepover with their friends Alya and Nino. During the sleepover, they play some Miraculous - themed games. Maybe they create their own Miraculous - inspired challenges, like a kwami - hiding game where they have to find a small object representing a kwami. And then, late at night, there could be a false akuma alert that turns out to be just a malfunctioning Ladybug - themed alarm. This could lead to some comical moments as they all scramble to 'transform' before realizing it's a false alarm.
One possible plot could be a rift within the Miraculous team. Maybe there's a disagreement over how to use the Miraculous powers. Some might think they should be more aggressive in fighting villains, while others prefer a more diplomatic approach. This could lead to two factions forming, just like in a civil war.