Carrie White would be the central character. There could also be some original characters created just for this fanfic. Maybe a local Derry resident who has some knowledge of the town's secrets and becomes Carrie's guide. And of course, there could be the antagonists in Derry, like Pennywise or other malevolent entities that might target Carrie due to her powers.
Obviously Carrie White herself. And perhaps some of the characters from Derry's own stories, like the Losers' Club members could make an appearance. They might interact with Carrie in different ways, either as allies or as those who are initially suspicious of her.
In this fanfic, Carrie White is the main one. But we might also see some of the Derry townspeople. There could be a young girl who is bullied in Derry just like Carrie was in her hometown. They could form a bond. And there could be an old hermit - like figure in Derry who has sensed Carrie's arrival and has his own motives for either helping or hindering her. Also, the local bullies in Derry could be characters that play a significant role in how Carrie's story progresses in the town.
Maybe Carrie White has some sort of adventure in Derry, Maine. She could encounter the same kind of supernatural elements as in her original story. For example, she might come across the malevolent force that haunts Derry and either fight it or be influenced by it.
There could be a mysterious new student in the fanfic. This new student might have some secrets of their own and befriend Percy. They could be from a different place or have some special powers or knowledge. Additionally, there might be some school janitors or cafeteria workers who play small but important roles in Percy's school experiences, like giving him some good advice or helping him out in a difficult situation.
Obviously, Harry Potter himself. There would also likely be Viktor Krum, who is from Durmstrang. Krum could be either a friend or a rival to Harry. Igor Karkaroff, the headmaster of Durmstrang, would be another important character. And there could be new students created for the fanfic, like a Durmstrang student who becomes Harry's guide in the new school.
Obviously, Harry Potter himself. There could also be some Beautox - natives, like a wizard or witch who is an expert in Beautox magic. Maybe Hermione would somehow find a way to follow Harry and she'd be there too, trying to figure out the new magic system.
Potential new characters might include a young American wizard called Tommy. He's a bit of a troublemaker but has a good heart. There could also be an old and wise American wizard professor, Professor Anderson, who teaches Harry about the history of American magic. And then there's a female wizard, Sophia, who is very interested in the British magic system and befriends Harry to learn more.
She could meet normal high school students, like the popular kids or the nerdy ones. Maybe there's a really smart student who becomes her study partner.
Some of Annabeth's other demigod friends from Camp Half - Blood might make an appearance. For instance, Grover could come to the school undercover to check on Annabeth and make sure she's okay in the mortal world. He could also help her out if there are any nature - related problems at the school.
He could meet Konan. Konan is closely associated with the Hidden Rain Village. Her paper - based jutsu would be an interesting interaction for Naruto. Maybe she could teach him something about her unique style of combat or they could end up in a battle.
Obviously, Harry would be one of the main characters. There could also be local Harlem residents like a street - smart kid who shows Harry around. A jazz singer could be another character, perhaps someone with a mysterious past that Harry gets involved with.
The main characters are Carrie and Gumball. Carrie is a ghost girl with special powers and a unique personality. Gumball is a blue cat - like character who is always getting into all kinds of crazy situations.