Well, perhaps Harry would struggle to fit in at first. He might be shocked by the normalcy of Forks High School compared to Hogwarts. Maybe he'd make new friends and introduce them to some of his magical knowledge in a very discreet way.
Well, one possible plot could be Hermione using her magic skills to solve the mysteries in Forks. Maybe she senses there's something strange about the Cullens and uses her knowledge to figure out they're vampires. She could also use her intelligence to outwit the high school bullies or help her new friends with their academic problems.
There are many potential characters. The teachers at Forks High School for sure. Harry could have interesting conversations with them. Also, if there are any other supernatural beings in the Forks universe in this fanfiction, like werewolves, he could interact with them. And of course, the students who are into different clubs and activities at the school. He might bond with the science - loving students or those on the school newspaper team, sharing his own experiences from Hogwarts in a veiled way.
Well, perhaps Harry could be a wizard - creature hybrid. In Forks, he might discover that the vampires there have a connection to the magical world he comes from. Maybe he uses his magic to help the Cullens with some sort of threat that normal vampire powers can't handle.
Well, he'd probably be really confused at first. I mean, Hogwarts is all about magic and Forks High School is a normal Muggle school. He might accidentally use magic when he's frustrated with a difficult class like Potions... I mean, Chemistry. And he'd surely stand out with his lightning - shaped scar.
Perhaps Harry goes to Forks because he senses some dark magic there that is related to the Volturi. He could end up getting involved in their power struggles. He might also start to learn about the unique rules and powers in the Forks supernatural world and compare them to what he knows from the wizarding world. For example, the way vampires have their own kind of 'magic' with their super strength and speed.
One possibility could be that Hermione uses her magic skills in Forks in unexpected ways. Maybe she helps the local people solve some strange problems that they can't figure out with normal means. For example, she could use a spell to find a lost item in the forest which is full of mystery in Forks.
In the fanfiction, if Harry Vampire goes to Forks, he could potentially fall in love with a human there, just like Edward did in the original Twilight story. But his vampire nature might make things more complicated. He could have to struggle between his love for the human and his vampire instincts. Also, he might face challenges from the local vampire community if they don't accept an outsider like him.
One possible plot could be Harry struggling to adapt to the strict discipline of military school at first. He might have conflicts with the drill sergeants who are tough on him. But as time goes by, he discovers his own inner strength and leadership skills, and eventually earns the respect of his peers and instructors.
Well, it could be about Death taking on a form that can attend Hogwarts with Harry. Maybe it's there to protect him in a more direct way than the usual magical means. It might interact with Harry's friends, causing some confusion and also some revelations about the nature of life and death in the wizarding world.
Maybe Harry could struggle with the language at first. He might make new friends who introduce him to French wizarding traditions. And he could have adventures in the unique French school setting.