It could be portrayed as having more powerful abilities. For example, instead of just creating sentimonsters, it can also control the elements for a short time when a sentimonster is created. So if a sentimonster is made to look like a bird, it can also make the area around it windy like the bird is flying fast.
One great fanfiction could be about Marinette getting the Peacock Miraculous in a unique situation. For example, in a world where all the Miraculouses are scrambled among the characters, Marinette discovers the Peacock Miraculous while on a solo adventure. She has to figure out how to use its powers, which are different from the Ladybug Miraculous she's used to. This could lead to some really interesting character development as she tries to master a new set of abilities.
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.
One possible plot could be that the peacock miraculous has a new holder. This new holder might be a bit of an anti - hero at first. They could use the peacock's powers to create sentimonsters for their own gain, like stealing valuable items. But as the story progresses, they start to see the harm they're causing and slowly turn towards the side of good, joining Ladybug and Chat Noir in their fight against Hawk Moth.
In a fanfiction, Adrien's mom might have used the Peacock Miraculous to create something special. For example, she could have created a magical object that was meant to protect Adrien when he was born. But then, due to some unforeseen circumstances, she had to disappear. This would tie in the Peacock Miraculous with Adrien's backstory in an interesting way. The story could then explore how Adrien discovers this connection as he grows older and becomes more involved in the Miraculous world.
Well, one popular type is where Marinette has to take on a dual role of being Ladybug and also using the Peacock Miraculous. These fanfictions often explore how she balances the two identities and powers. Another popular theme is Marinette using the Peacock Miraculous to go back in time or access different dimensions. It adds an exciting twist to the story.
In the fanfiction, it could be that Adrien's mom had a special bond with the Peacock Miraculous. She was able to use it in a unique way that no one else could. But using it also put her in danger. When she had Adrien, she knew she had to protect him from the threats associated with the Miraculous. So she disappeared, leaving behind clues for Adrien to find when he was old enough. As Adrien uncovers these clues, he gets closer to understanding his mom's connection to the Peacock Miraculous and the secrets she held.
There are indeed. Fanfiction writers often come up with creative stories involving the wolf miraculous in the Miraculous Ladybug world. They might explore how a new holder of the wolf miraculous interacts with Ladybug and Chat Noir. It could be about a character who discovers the power of the wolf miraculous and has to learn how to use it to fight against Hawk Moth's akumas. You can also check fanfiction.net for some interesting reads.