A great idea for Miraculous Kwamis fanfiction could be a time - travel story. Imagine a Kwami traveling back in time to when the Miraculouses were first created. It could witness the origin of the powers and the reasons behind their creation. This could then lead to a series of events where the Kwami tries to change something in the past that has an impact on the present and future of the Miraculouses and their holders.
Tikki is really interesting. She's the Kwami of Creation and is always positive and full of wisdom. There are so many aspects to explore, like how she encourages Marinette in difficult situations. Plagg is also great. His mischievous nature as the Kwami of Destruction provides a lot of comical and interesting storylines. Another one is Wayzz. His calm and knowledgeable demeanor makes him a great character to write about, especially when it comes to guiding his holder about the powers and history of the Miraculous.
Use different settings. Instead of just Paris, set your story in a different city or even a different planet. It'll give a fresh look. Also, create new Kwami - like characters that are related to the existing ones. For example, a baby Kwami or an elder Kwami.
One idea could be exploring the backstories of the Miraculous holders in more depth. For example, how did Marinette first discover her powers and what was her initial reaction? Another idea is to create an alternate universe where the roles of the heroes and villains are reversed. This would bring a whole new dynamic to the story. Also, a fanfiction could focus on the relationship between the kwamis and their holders, like how they communicate and influence each other's decisions.
One idea could be a story where the Peacock Miraculous has a unique malfunction that causes it to create unexpected akumas. For example, instead of creating the usual villains, it creates akumas that have the power to spread positive emotions but in a chaotic way that still disrupts Paris. Another idea is a fanfiction where the holder of the Peacock Miraculous has to team up with Ladybug and Chat Noir to fight against an ancient evil that is specifically drawn to the power of the Peacock. This could involve exploring the history of the Miraculous and its connection to this new threat.
Another great option is a crossover with the Star Wars universe. The Miraculous holders could find themselves on different planets, using their powers in a galaxy far, far away. They might have to deal with Sith Lords or Imperial forces while still maintaining their identities in Paris.
Well, a good idea for a Miraculous Hogwarts fanfiction could be a story where Marinette discovers she has a hidden wizarding bloodline. She gets her Hogwarts letter and has to balance her life as Ladybug in Paris and a student at Hogwarts. She could use her creativity from her fashion designing in the wizarding world too, like creating unique magical robes. Chat Noir could also find a way to visit Hogwarts secretly to help her out when she gets into trouble with dark wizards or other challenges at school.
A crossover with the world of Sailor Moon would also be cool. The Miraculous holders could meet the Sailor Scouts. They could exchange their powers and fighting techniques. For example, Ladybug could show Sailor Moon how to use her yoyo in a more strategic way, and Sailor Moon could teach Ladybug about the power of love and friendship in her battles.
One idea could be that during Halloween, the Miraculous holders have to deal with akumas that are inspired by classic horror movie monsters. For example, an akuma that turns into a vampire - like creature, making people fall under its spell and causing chaos in the city. Another plot could be a Halloween party where the villains try to steal the Miraculous in disguise, adding an element of mystery and danger.
One idea could be that the fox Miraculous has some unique powers that are not fully explored in the original. For example, it can create illusions not just of objects but also of emotions, which the fox - themed hero uses to calm down akumatized villains.
One idea could be Carapace getting a new power upgrade and having to learn to control it while facing a powerful new villain. Maybe he teams up with a new Miraculous holder.