Maybe it's about two ladybugs who meet by chance in a beautiful garden. They start to explore the world together, sharing little secrets among the flowers and leaves.
One possible plot could be that Ladybug and Chat Noir form a special 'Love Patrol' to protect the city during a Valentine's Day event. They notice that an akumatized villain is targeting couples and spreading hate. As they fight, they also start to realize their own feelings for each other more deeply. They use their powers in creative ways, like Ladybug's Lucky Charm creating heart - shaped objects that help them in the battle.
Well, perhaps in the 'ladybug pregnant fanfic', it could focus on how Ladybug discovers she's pregnant. Maybe it's a surprise, and she has to deal with the emotional turmoil. She starts thinking about how this will change her life as a superhero and her relationships with her friends and family. There could also be a sub - plot about how the city starts to notice small changes in Ladybug's behavior and tries to figure out what's going on.
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 plot idea could be that the pregnant ladybug is on a journey to find a special place to lay her eggs safely. Along the way, she meets different bugs who either help or hinder her. Another could be that she has to protect her unborn babies from a predator in the garden.
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 Ladybug is betrayed by someone she deeply trusts, like Chat Noir accidentally revealing her identity to Hawkmoth. This shatters her world and makes her vulnerable to Hawkmoth's akuma. As Ladybug gets akumatized, Paris is in chaos as she starts using her powers in a negative way. The other heroes, like Rena Rouge and Carapace, try to find a way to save her and break the akuma's hold.
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.
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.