It could be a dark wizard who has also discovered the secrets of Forks and wants to use the town's unique location or some hidden power there for evil purposes. This dark wizard might see Harry and Ron as threats and try to get rid of them. He could be using dark spells to manipulate the townspeople or cause chaos in Forks.
Perhaps a group of anti - magic fanatics in Forks could be the antagonists. They sense that Harry and Ron are different and start to suspect that they have some sort of supernatural abilities. They then try to drive them out of town, using various means like spreading rumors, trying to frame them for crimes, or even physically attacking them. This would create a lot of conflict for Harry and Ron as they try to protect themselves and also complete whatever mission they have in Forks.
Another possibility is a vampire from outside the Cullen family who doesn't like the idea of wizards in Forks. This vampire might view Harry and Ron as competition for the resources or territory in Forks. He could start attacking the townspeople to draw Harry and Ron out and then engage them in a battle, using his vampire powers against their magic.
It could be Voldemort. Even though he's from the Harry Potter universe, if he finds out that Harry is hiding in Forks, he could send his Death Eaters there. This would not only put Harry in danger but also the Cullens and the people of Forks as the Death Eaters might start causing chaos.
It could be Draco Malfoy. Since Harry and Ron are not friends, Draco could take advantage of their weakened state. He might try to turn them against each other even more, perhaps by spreading false information about one to the other. He could also try to isolate Harry from the Gryffindor group since Ron is no longer on his side, making Harry an easier target for his bullying.
Harry is the protagonist from the wizarding world, known for his bravery and his fight against Voldemort. Cedric, on the other hand, was a popular and kind - hearted student at Hogwarts. In this fanfiction, they are the central figures as they are the ones who will experience the new environment of Forks and interact with whatever they find there.
It could be a powerful vampire who doesn't like the interference of Cedric and Harry in Forks. This vampire might see them as a threat to the secrecy of the vampire community in Forks.
Perhaps a new, powerful demigod - vampire hybrid that Percy has to face. This hybrid could be causing trouble in Forks, and Percy has to stop it before it destroys the delicate balance between the vampires, werewolves and humans there.
Well, perhaps they move to Forks for a new start. Maybe they are intrigued by the different atmosphere there compared to their own magical world. They could explore the non - magical side of life, make new friends, and Luna might find some really interesting natural phenomena in Forks to study.
Perhaps they go to Forks to start a new life away from the wizarding world. They could find common ground with the outcast characters in Forks. Harry, with his experience of being an outsider in the wizarding world, and Draco, who has also had his own issues of fitting in, might bond with the misfits in Forks. They could end up helping the local community while also learning about themselves.
Well, they might encounter the vampires and werewolves from the Forks' lore. Harry could use his magic skills to deal with the various challenges there. Maybe he'd form an unlikely alliance with the Cullens or other local supernatural beings.
Well, it could be that Harry and Cedric find themselves in Forks for some magical reason. Maybe they are on a mission to protect the town from dark forces that are starting to surface there. They might use their magical skills in a world that is not used to magic, like in Forks which is more of a normal human town in the Twilight universe.
It's Harry and Severus. Harry, who has been through so much in the fight against Voldemort, and Severus, whose loyalty was always in question but ultimately was on the side of good. In this fanfic, they are the central figures as they embark on this new adventure in Forks. They will probably have to rely on each other more than they ever have before, given that they are in a completely new and unfamiliar place.