Who could be the main villain in a Miraculous Ladybug Emma Agreste fanfiction?

Maybe Emma starts to have dreams that are actually premonitions of future akuma attacks. She then has to convince Ladybug and Chat Noir that her dreams are real without revealing too much about herself. Or, she could find a way to create her own superhero identity and team up with Ladybug and Chat Noir, but struggles with the responsibility that comes with it as she is still a young girl.

A new character could be introduced as the main villain. Maybe a corrupt police officer who turns to the dark side. He could use his knowledge of the law and the city's security systems to commit crimes and frame the Miraculous heroes. He would be a formidable opponent as he has insider knowledge.

An evil alien warlord could be the main villain. This warlord could be bent on conquering Earth and other planets in the universe. He might see the Miraculouses as a threat and try to destroy Ladybug and Chat Noir first.

Hawkmoth is an obvious choice. His whole mission is to obtain the Miraculouses, and in a death fanfiction, he could succeed in a more devious way than in the original series, directly or indirectly causing Ladybug's death.

A possible main villain could be a character from Ladybug's past who has discovered her identity and is using that knowledge to create chaos. They could be blackmailing her or trying to steal her Miraculous by setting up elaborate mysteries and traps for her to solve.

Obviously, Ladybug and Chat Noir would be main characters. They would be the ones protecting Baby Emma. Marinette and Adrien, in their civilian forms, could also play important roles. Maybe Marinette's parents could be involved too, as they might be the ones looking after Baby Emma when Marinette is off being Ladybug.

Hawk Moth would be an obvious choice as he is the main villain in the series. He could be extra devious during Christmas, trying to ruin the festive mood for everyone in Paris. He might akumatize people who are feeling left out or jealous during the holidays.

The main villain could be a pirate captain who has found a dark Miraculous. He uses its power to control other pirates and turn them into his minions. He wants to use the power of the Ladybug and Cat Noir Miraculous to become the most powerful being on the seas.

Ladybug and Chat Noir would likely be main characters as well. Since it's a Miraculous Ladybug fanfiction, they are important figures in that universe. They would interact with the son of the villain, either as enemies at first or as potential allies. And then there could be the villain parent. This character would have a big influence on the son's life and actions, constantly pulling him towards the path of villainy.

Hawkmoth could be the main villain as always. He might see the Valentine's Day spirit or all the love in the air during the Love Patrol's time as an opportunity to akumatize someone. Maybe he akumatizes a jilted lover who then goes on a rampage against happy couples in Paris.