Well, a plot could focus on the redemption of Miracle Queen. Maybe she realizes the error of her ways after seeing the destruction she has caused. This could lead to her trying to make amends and helping the heroes in secret. Or, you could have a fanfiction where the Miraculous holders have to travel back in time to prevent Miracle Queen from ever becoming evil in the first place. And then there's the idea of a story where Miracle Queen teams up with an unexpected ally, like a villain from another dimension, and the heroes have to figure out how to handle this new threat.
I think Chloe could be really interesting. Since she was Miracle Queen, exploring her motives and her internal struggle would add depth to the story. Maybe she wasn't fully in control when she became Miracle Queen and there's more to her actions than meets the eye.
I'm not entirely sure specifically what 'queen of mean miraculous ladybug fanfiction' is about without reading it. It could be a fanfiction that focuses on a 'queen of mean' character within the Miraculous Ladybug universe. Maybe it's about a powerful and perhaps villainous female character who causes trouble for the main characters like Ladybug and Cat Noir.
Once upon a time in Paris, Queen Bee was having a tough day. She had just had an argument with Ladybug. In the Miraculous Ladybug style, she decided to prove herself on her own. She started patrolling the city alone. As she flew across the rooftops, she noticed a strange akuma - like shadow. Without hesitation, she dived towards it. But it was a tricky illusion created by Hawk Moth. Queen Bee quickly realized her mistake and called for backup. Ladybug and Chat Noir soon arrived, and together they defeated Hawk Moth's new scheme.
One interesting fanfiction could be about Queen Bee's secret training sessions before she became an official Miraculous holder. It might explore her insecurities and determination to prove herself.
The fanfiction might begin with Queen as an outcast in Paris. Despite her regal appearance, people are afraid of her. One day, she discovers a strange Miraculous - like object. As she touches it, she is filled with a new sense of purpose. Meanwhile, Ladybug and Chat Noir sense a new energy in the city and start to search for the source, which leads them to Queen.
Use vivid descriptions. When writing about Queen Bee's transformation or her using her powers, make it exciting for the readers. For example, describe the flash of her suit as it appears. Also, give her some unique challenges that are different from what Ladybug and Chat Noir face. This will make the fanfiction stand out.