A plot where there is an international Miraculous team-up. Heroes from different countries with their own Miraculous come together to face a global threat. They have different fighting styles and powers, and it's a challenge for them to work together against a common enemy in this showdown.
How about a showdown in an alternate dimension? The Miraculous holders find themselves in a dimension where the rules are different. The villains are stronger, and they have to figure out how to adapt their powers and strategies to win this unexpected and dangerous showdown.
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.
A plot could revolve around Naruto being mistaken for a new Xiaolin Dragon. He then has to prove himself in the Xiaolin Showdown challenges while also trying to find a way back to his own world. Along the way, he makes new friends among the Xiaolin crew and discovers new aspects of his own powers as he adapts to the different challenges presented in the Xiaolin Showdown universe.
One idea could be a vampire infiltrating the Xiaolin temple to steal a powerful Shen Gong Wu for his own dark purposes. Maybe he plans to use it to gain control over other vampires or to create an army of the undead. Another plot could involve a Xiaolin monk being turned into a vampire and having to struggle between his newfound vampiric nature and his duties as a protector of the Shen Gong Wu. A third idea is that a vampire lord from the past awakens and challenges the Xiaolin monks to a showdown, with the fate of the world at stake.
One idea could be a crossover where the Miraculous heroes and Ben 10 team up to fight a common enemy. Maybe an alien villain that is immune to the powers of the Miraculous but Ben's alien forms can counter. Another could be a situation where Ladybug's Lucky Charm combines with one of Ben's alien gadgets to create a super - weapon. And a third could be a story where Ben gets akumatized and the Miraculous heroes have to figure out how to save him without using brute force as his alien forms are very powerful.
One idea could be Multimouse getting lost in an alternate dimension where the rules of the Miraculous are different. She has to figure out how to use her powers in new ways to get back home.
One idea could be that the Miraculous Phoenix has the power to heal not only physical wounds but also emotional traumas. The story could follow a character who is deeply scarred by past events and is chosen by the Phoenix Miraculous. As they learn to use its powers, they gradually heal themselves and those around them.
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.
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 the discovery of a new power within the Dragon of Nature. Maybe it can communicate with all living things in a more profound way, leading to a new type of Xiaolin Showdown where the power to influence nature on a large scale is at stake. Another plot could involve a villain trying to corrupt the Dragon of Nature, and the Xiaolin monks have to go on a quest to purify it.