Common themes are transformation, not just in the sense of the Miraculous transformations but also in the characters' personalities. Hawk Moth might transform from a pure - evil figure to something more complex. Another is the exploration of the Miraculous powers. Fanfics often dig deeper into how the powers work and how they can be used in different ways against Hawk Moth. And secrecy is a big theme. Keeping identities secret, Hawk Moth's secrets, and how those secrets impact the story.
One great fanfiction is 'The Hawk Moth's Redemption'. It explores an alternate universe where Hawk Moth starts to question his motives. Another interesting one is 'Ladybug and Hawk Moth's Unlikely Alliance' which has a unique plot of the two having to team up for a common cause. And 'Hawk Moth's Hidden Past' delves into his backstory and how he became the villain we know.
It could be Gabriel Agreste. He has been a suspect in the original series for various reasons. He is often absent and has a lot of secrets. So in the fanfiction, it would make sense if he was finally revealed as Hawk Moth.
There could be fanfictions where Gabriel as Hawk Moth teams up with unlikely allies. Perhaps he realizes that his way of doing things is wrong and joins forces with Ladybug and Chat Noir to fight a greater evil that threatens the entire city or even the world.
I'm not sure of specific titles off the top of my head, but you can check out fanfiction websites like Archive of Our Own. There are likely many stories there that focus on Gabriel as Hawk Moth. You can look for ones with high ratings and lots of reviews.
One common theme is the power of friendship. In Miraculous Ladybug fanfiction set in a miraculous world, characters often rely on their friends to overcome challenges. Another theme is the battle between good and evil. Ladybug and Cat Noir are constantly fighting villains. Also, self - discovery is a theme as the characters grow and learn more about their powers and themselves.
One common theme is sacrifice. The characters often have to make difficult choices that may involve sacrificing their own safety or relationships for the greater good in the war. For example, they might risk their civilian identities to protect the city.
Often, power struggles play a role in the betrayal fanfiction. Maybe a new villain emerges who offers one of the heroes more power in exchange for betraying their partner. In terms of emotions, jealousy is also a common theme. If Ladybug seems to be getting closer to a new hero, Chat Noir might feel jealous and this could lead to a situation where he 'betrays' her in some way, like not coming to her aid when she needs it.
Another theme is the discovery of new powers or abilities related to the pets. Sometimes, the pets are not ordinary animals but have some sort of miraculous or magical element to them. This adds an interesting twist to the story as the characters have to figure out how to use these new elements to their advantage. In some fanfictions, the pets can even transform, which is really cool.
A less obvious but still possible theme is the cultural significance of the characters' hair. In some fanfictions, the writers might explore how Ladybug's hair, with its red color and pigtail style, could be related to certain cultural ideals or how it stands out in the Parisian setting. Similarly, Cat Noir's dark hair could be associated with mystery or a sense of rebellion, and fanfictions might play on these ideas to create unique stories.
One common theme is the integration of Chinese culture. For example, Chinese festivals like the Spring Festival or Mid - Autumn Festival might be incorporated into the story, with the characters celebrating and experiencing the unique traditions. Another theme could be the use of Chinese martial arts, where the characters show off their skills.