Well, perhaps in this fanfiction, the masquerade ball could be a setting for a love confession. Marinette, as Ladybug, could be so caught up in the magic of the ball that she lets her guard down a bit around Adrien. Or it could be a place where new Miraculous holders are revealed. There might be a secret mission that Ladybug and Chat Noir have to undertake during the ball, and they have to navigate through the crowd of masked people to complete it.
I think Ladybug would be the most interesting. At the masquerade ball, she has to maintain her secret identity while also enjoying the event. She might be on the lookout for any signs of trouble, all while looking elegant in her ballgown and mask. It would be exciting to see how she interacts with other characters without giving away who she really is.
Well, perhaps other superheroes from different cities could be special guests. They could come to the Parisian ball to share their experiences and strategies in fighting villains.
Maybe at the ball, a new Miraculous holder is revealed. This person has a power related to the ball's elegance, like the ability to create beautiful illusions. Ladybug and Chat Noir have to quickly assess if this new holder is an ally or a foe during the ball.
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.