Obviously Hermione herself. There could also be the military school instructors, who might be strict and tough. And some of her classmates, perhaps some are friendly and others are rivals.
Hermione is the main character of course. Then there could be a gruff old military school commandant who is initially skeptical of Hermione but later comes to respect her. There may be a group of misfit classmates that Hermione befriends. There might also be a rival student who is jealous of Hermione's quick progress in military training.
Well, perhaps the plot could involve Hermione facing challenges in a male - dominated military school environment. She might use her intelligence to outwit bullies and excel in military tactics and training.
Maybe a new student who has some psychic abilities that attract the attention of the ghosts in the school. This student could either be a friend or a foe to Danny, depending on how the story unfolds.
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, Gohan would be the main character. Videl could also be in it as a classmate or a potential love interest. Piccolo might keep an eye on Gohan from afar to make sure he doesn't get into too much trouble. And of course, Gohan's friends from previous adventures could make cameo appearances, like Krillin dropping by the school sometimes.
Perhaps she'll meet older, more experienced students who can act as mentors. These students could introduce her to secrets of the new school that are not easily accessible to newcomers. They might also help her with any homesickness she has for Hogwarts.
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.
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.
Gary could be one of his rivals. Gary has always been competitive with Ash. Another potential rival could be a new character introduced in the fanfiction, someone who is really good at Pokemon battles and wants to prove himself better than Ash.
There could be a strict drill sergeant as one of the main characters. This person would be constantly pushing Percy to his limits and teaching him discipline. Another character might be a fellow student who becomes Percy's best friend. They could support each other through the tough times at military school.
Well, she might face new challenges. In a different school, the curriculum could be completely different. Maybe she'll have to learn new spells or magical theories that are unique to that institution. She could also meet new friends or rivals. There might be a different social hierarchy compared to Hogwarts, and she'll have to find her place in it.