One great fanfiction could be 'Marinette's Unbound Locks' where she lets her hair down during a special moment at a school dance. It beautifully describes how her long hair frames her face and adds to her charm as she shares a dance with Adrien.
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 common plotline is Marinette's hair being down as a sign of a transformation in her character. For example, she might let her hair down when she decides to be more assertive or when she's finally coming to terms with her feelings for Adrien. It shows a more vulnerable and yet confident side of her.
Marinette could start by gathering evidence of her own whereabouts at the time of the supposed crime. If she was at the bakery or with a friend, getting statements from those people would be a good first step.
A fanfiction titled 'Marinette's Eye - Opener' is also quite good. Here, Marinette finds out about a different side of Chat Noir that she never knew before. It changes their relationship dynamics and makes for a very engaging story. The author does a great job of exploring Marinette's emotions as she comes to terms with this new discovery.
One possible scenario could be that Marinette gets injured during a fight as Ladybug and is rushed to the hospital. In the fanfiction, her friends might come to visit her, and there could be some sweet moments between her and Adrien as he's worried about her. Maybe she has to keep her identity a secret even while in the hospital, which adds an extra layer of tension.
There's also 'The Luka - Marinette Connection'. In this fanfiction, the connection between Luka and Marinette is explored on a deeper level. It starts with Luka noticing Marinette's little quirks and how she tries to hide her feelings. As the story progresses, they start to open up to each other more. The author creates a really engaging story by adding in some mystery elements related to the Miraculous and how it might affect their relationship.
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 possible fanfiction could be about Marinette transforming into a mouse - themed Miraculous holder. Maybe she discovers a new mouse - themed Miraculous in a hidden part of Paris. This could lead to her having new powers like super - speed and the ability to fit into small spaces. She could use these powers to outwit Hawk Moth's akumas in a really unique way, and her relationship with Adrien might also take an interesting turn as she tries to keep her new identity a secret from him.
In Miraculous Ladybug fanfiction, Marinette in a bikini could be part of a beach - themed story. Maybe she's on vacation with her friends. It could be a fun and light - hearted scenario where she shows off her confidence and style while enjoying the sun and sand.