There could also be other characters from either Stiles' world or the Winchesters' world that make appearances. For example, in Stiles' world, there might be his friends like Scott who could be mentioned or even play a small part in the story. And from the Winchesters' side, characters like Castiel could potentially show up and interact with Stiles in some really interesting ways.
One interesting plotline could be Stiles teaming up with the Winchesters to hunt a particularly elusive and dangerous supernatural creature. Maybe it's a new type of werewolf that has powers they've never encountered before.
Perhaps the plot involves a magical artifact that has fallen into the wrong hands in the Supernatural world. Harry, with his knowledge of magic, and the Winchesters, with their experience in dealing with the supernatural, set out to retrieve it. They might face all sorts of challenges along the way, from vampires and werewolves to dark magic spells.
Well, one possibility is that Percy's demigod powers would be a huge shock to the Winchesters. They are used to dealing with all sorts of supernatural stuff, but Percy's ability to control water and his connection to the Greek gods would be something entirely new. Maybe they'd team up to fight a common enemy that has ties to both Greek mythology and the dark forces the Winchesters usually battle.
In such a fanfiction, there could be an epic battle. Nico's powers from the Percy Jackson universe might clash with the Winchesters' hunting skills. Maybe they initially misunderstand each other, thinking the other is a threat. But then they could realize they are all fighting against some form of evil and team up. For example, Nico could use his ability to control the dead to help the Winchesters deal with a horde of zombies, while the Winchesters could teach Nico some of their combat tactics against demons.
Definitely Harry Potter himself. His magic and his sense of right and wrong would bring a new dynamic to the Winchester world. And then there's Dean Winchester. His tough - guy attitude and his skills as a hunter would be really cool to see interact with Harry. Sam Winchester too, with his intelligence and research skills, could be very interesting when combined with Harry's knowledge of the magical world.
In the 'hermione meets the winchesters fanfic', it's possible that there would be a lot of cultural clashes at first. Hermione comes from the wizarding world which has its own set of rules and ethics, while the Winchesters operate in a more gritty, monster - hunting world. But over time, they could learn from each other. For example, the Winchesters could show Hermione how to be more street - smart and resourceful in a non - magical way, and Hermione could introduce them to more complex magical concepts and tools. This interaction could lead to some really interesting and unique storylines, like them teaming up to fight a powerful dark force that combines both magic and the supernatural creatures the Winchesters usually deal with.
The main characters are Stiles and the Cullens. Stiles is known for his ability to adapt in strange situations. When he meets the Cullens, their interactions will be centered around how they deal with each other's differences. The Cullens' vampiric abilities and Stiles' human (or whatever he is in his original context) nature will play a big part in their relationships in the fanfiction.
In this fanfiction, Stiles might initially be in awe of the Cullens' beauty and grace. Maybe he'll be a bit intimidated by their vampiric nature at first. For example, he could be shocked by their superhuman speed or strength when he first witnesses it.
Stiles is the key character here. He's the one through whose perspective we usually experience the story. In the pack, Scott is a must - he's the werewolf who has a long - standing friendship with Stiles. Derek, with his alpha - like presence, also plays a major role. Additionally, characters like Allison, who has her own arc related to the supernatural world, could be part of the main cast as well. They all interact with Stiles in different ways when he meets the pack.