A lot of these fanfictions focus on the relationship between Marinette and Adrien. For example, in some, Adrien is overjoyed when he finds out about the pregnancy and they start planning their future together. It's sweet to read how their love grows even stronger in the face of this new development.
I really like 'The Hidden Bond'. In this fanfiction, Marinette discovers a new side to Cat Noir that she hadn't seen before. It's full of cute moments and some really well - written dialogue. It also has an interesting plot that keeps you hooked from start to finish.
One great fanfiction could be about Marinette getting the Peacock Miraculous in a unique situation. For example, in a world where all the Miraculouses are scrambled among the characters, Marinette discovers the Peacock Miraculous while on a solo adventure. She has to figure out how to use its powers, which are different from the Ladybug Miraculous she's used to. This could lead to some really interesting character development as she tries to master a new set of abilities.
One great fanfiction could be where Marinette discovers she has mermaid powers while still being Ladybug. It might start with her finding a strange shell that gives her the ability to transform into a mermaid. In the story, she could use her mermaid form to access new parts of Paris that are underwater, like hidden caves. This would add an exciting new dimension to her adventures as Ladybug and also her relationship with Adrien. Maybe she has to keep her mermaid identity a secret from him at first, which would create some interesting drama.
There's also 'Marinette's Hidden Talents'. In this fanfic, Adrien discovers some unique skills that Marinette has been hiding. It's a really interesting take as it builds on their characters and the bond between them. It has a lot of cute moments and a bit of mystery too.
The relationship with Adrien is a huge theme. It could be about how they navigate their relationship when this big change occurs. Some fanfictions show them having to grow up quickly and become more responsible for each other and the baby. It also might explore how their identities as Ladybug and Chat Noir play into their new family situation.
One great Marinette x OC fanfiction is 'A New Hero in Paris'. In this story, the OC has a unique power that complements Marinette's Ladybug abilities. The interactions between them are really well - written, starting from initial misunderstandings to a deep friendship and potential for more. It shows how the OC fits into the Miraculous Ladybug world and the challenges they face together.
There is this fanfic named 'Discovery of a Lifetime'. Marinette discovers that there is a parallel Miraculous world that is linked to her own. This discovery leads her on a journey to explore this new world and find out how it relates to her role as Ladybug. The story has a lot of world - building and Marinette's character development is really interesting throughout the story.
A really interesting fanfiction idea could be that Lila and Marinette switch personalities for a day. This would be a comical yet thought - provoking situation. Lila would have to deal with Marinette's responsibilities and kindness, while Marinette might struggle with Lila's devious ways. It could lead to both of them having a new perspective on each other.
One possible fanfiction could be about Marinette's daily life with Tikki. For example, Marinette could be having a tough day at school, getting bullied by Chloe. Tikki, being her kwami, tries to cheer her up by suggesting they make some special macarons. They then spend the evening in Marinette's room, sharing stories and laughing, which helps Marinette forget about her bad day.
Well, this kind of fanfiction could start with Marinette making a mistake while using the Miraculous. Then she finds herself in the form of a Kwami. She might be really tiny and have to find ways to get around. She could hitch rides on people's shoulders or use her small size to her advantage when it comes to spying on Hawk Moth. And she would definitely have to deal with the fact that she can't just transform back into her normal self right away, leading to all sorts of comical and tense situations.