She could be a love interest for one of the main characters. Maybe Chat Noir falls for her charm, which creates some tension in his relationship with Ladybug. It would add a new layer of drama to the story.
One possibility in Miss Fortune in Miraculous Ladybug fanfiction could be that she is a new villain. She might use her charm and wits to try and steal the Miraculouses. For example, she could pretend to be an ally to Ladybug and Cat Noir at first, only to double - cross them later when she gets close to the Miraculouses.
Tikki and Plagg, the kwamis of Ladybug and Chat Noir respectively, could also be considered main characters in a sense. Their wisdom and powers are crucial in the story. In a Miss Fortune fanfiction, they might interact with Miss Fortune in unexpected ways, like giving her advice or even having some sort of special connection with her.
One interesting plot could be Miss Fortune having to team up with Ladybug and Chat Noir in a situation where they initially suspect her. For example, a new villain emerges who has the power to create illusions of past akumas. Miss Fortune's unique abilities might be the key to seeing through these illusions, but Ladybug and Chat Noir are hesitant to trust her at first.
One interesting plot could be Miss Bustier getting involved in a Miraculous - related adventure herself. Maybe she discovers a hidden Miraculous and has to learn how to use it to protect the school from a new villain. Another plot could be a backstory exploration of Miss Bustier's life before she became a teacher at the school in the Miraculous Ladybug world. For example, her relationships, dreams, and how they shaped her into the person we see in the show.
To write a compelling character for Miss Bustier in fanfiction, start with her known traits. She's kind, patient, and a good teacher. Expand on these. For example, show her patience being tested in extreme situations. Maybe she has to deal with a very difficult student who is constantly causing trouble, but she still manages to find a way to reach out to them. This would make her character more three - dimensional.
In an akumatized Ladybug fanfiction, the akuma might enhance her powers in unexpected ways. For example, her Lucky Charm could become a more powerful and unpredictable object. Her akumatized form might also have a darker and more menacing look, perhaps with a more aggressive fighting style. Writers could explore how the heroes and villains interact with this changed Ladybug.
In this 'Miraculous Ladybug Criminal Ladybug Fanfiction', there could be a lot of potential storylines. One possibility is that an external force is influencing Ladybug to commit crimes. It could be a new villain who has found a way to manipulate the Miraculous. This would create a great conflict as Ladybug has always been the symbol of good. Her friends and allies would be in shock and would have to find a way to stop her without hurting her. The story could also explore her internal struggle, as she might be aware of what she's doing but unable to stop herself.
A new villain could have a weapon that specifically targets Ladybug's powers. When she tries to use her yo - yo or her powers of creation, it backfires and causes her harm. This would force her to rely on her wits and Chat Noir more than ever. They would need to find a way to neutralize the weapon and heal Ladybug.
In a fanfiction, Ladybug could get hurt as a result of a trap set by Hawkmoth. He might have studied her fighting patterns and set up a situation where she is lured into a place full of obstacles that cause her physical harm. This would not only test her physical strength but also her mental resilience as she tries to figure out how to escape and continue her fight against evil.