The Cullens might see him as a potential threat or an ally. If they think he's going to be nosy and try to uncover their secrets, they could keep an eye on him. On the other hand, if he shows understanding and acceptance, they might welcome him into their circle. He could also change the dynamics between Bella and Edward, as Edward would need to consider his relationship with Bella's brother as well.
One possibility could be that his move to Forks sets off a chain of events related to the supernatural elements already present there. Maybe he discovers secrets about the vampires and werewolves that Bella is involved with and has to navigate this new world while also trying to protect his sister.
In a fanfiction where Naruto moves to Forks, it could change the dynamics of the town completely. Naruto is not one to sit around. He'd probably explore the forests around Forks and might stumble upon some secrets that the locals don't even know. His presence could also attract unwanted attention from other supernatural elements in the area, thinking he's some new kind of threat. And he would definitely have a hard time adjusting to the school system there, but his positive attitude would help him make friends eventually.
The story could develop in many ways. One way is that Harry might get involved in the local mysteries of Forks. Since he has experience with secrets and mysteries in the wizarding world, he may start to notice things that others don't. He could discover the truth about the vampires and werewolves there before anyone else does. Another possibility is that his magic could attract unwanted attention, either from the supernaturals in Forks who might see him as a threat or from the Muggles who start to notice strange things happening.
In this fanfiction, Bella's pregnancy adds a lot of drama when she moves to Forks. There are new challenges and tensions that arise from this unexpected situation.
For the teachers at Beacon, Adam would be a complex case. They would need to keep a close eye on him to make sure he doesn't cause any disruptions or endanger other students. His presence could also force them to re - evaluate their teaching methods and how they handle students with strong and potentially dangerous beliefs.
Obviously, Percy would be the main character. There could also be some characters from the original Percy - related universe who might make an appearance to help him adjust or just to check on him. And from the Forks side, characters like Bella or Edward (if it's in the Twilight - Forks setting) could potentially cross paths with Percy. Maybe they become friends or foes depending on how the story unfolds.
His presence could completely rewrite the history of the Hidden Leaf Village. For example, if he manages to prevent the Nine - Tails attack, it would mean that many of the characters' backstories would change. People like Sasuke, who was also affected by the events related to the Nine - Tails, might have a different path.
If Bardock arrives on Namek in the fanfic, it could also change the fate of the Dragon Balls. Instead of being just a tool for Frieza or the Z - fighters to use, Bardock could have a different vision for them. He might see them as a way to not only save Namek but also to restore the Saiyan race. This would open up a whole new set of plotlines and possibilities, as his motives would be different from the other characters who have interacted with the Dragon Balls in the original story.
His presence would likely shake up the power dynamics. Batman's no - quirk combat skills would be a novelty in a world dominated by quirks. Heroes might start to question if they rely too much on their powers. Villains would also have to adapt to a new threat who doesn't play by the rules of quirks.
At Forks High School, Harry Potter would be a game - changer. His quick thinking and ability to adapt, which he developed at Hogwarts, would help him in this new environment. He might start clubs or activities that are different from the norm. For example, he could start a self - defense club inspired by his dueling experiences. His presence would also attract attention from not only students but also teachers, who would be intrigued by his different way of looking at things. And his friendship with Hermione and Ron at Hogwarts has taught him the value of loyalty and friendship, which he would bring to Forks High, making him a great friend to those in need.