The school librarian could be a main character in a femdom school story. She controls the access to books, which is a powerful position. She might have strict rules about borrowing and returning books, and if students break those rules, she has her own ways of dealing with them, like making them help with library chores for a week.
Obviously, the pony boy would be one of the main characters. And there would be the dominant female or females. Maybe a strict mistress who controls the pony boy's life.
In this type of story, the central character is surely the femdom figure. She is the driving force behind the breeding program. There could also be veterinarians who play a role as they are important for the health of the 'cocks' in the breeding program. Additionally, there might be other characters like suppliers who provide the necessary food and equipment for the breeding. But the femdom character is the one who has the overall control and makes the major decisions.
Definitely the students. There could be a girl who has been dancing all her life and dreams of becoming a professional ballerina. Another main character could be a boy who is new to dance but has a natural rhythm. And don't forget the school director, who is always trying to balance the budget and keep the school running smoothly while also dealing with the drama among the students and teachers.
One main character could be a young superhero who has just discovered his powers and is trying to fit in at the school. Another could be an older student who has been at the school for a while and is a bit of a rebel. And there could be a character who doesn't seem to have any powers at first but later discovers a hidden power within. These characters would interact, learn from each other, and face various challenges in the 'School for Superheroes Story'.
A young boy with the power of super speed. He's always eager to prove himself and is often the first to volunteer for dangerous missions.
The main characters could be the student robots. For instance, a clever robot named Robo - 1 who is always at the top of his class.
I don't know as I haven't read it, but likely the main characters would be the women in stockings who are in the femdom role.
It's hard to say without reading it. However, it's likely that there will be a protagonist who is either drawn into or forced into the femdom world. There could be a mentor - like female character who guides the main character through the rules and ways of this world. And there may be other characters who oppose or support the main character's journey.
The main character could be a shy student who uses crossdressing at summer school as a way to step out of their comfort zone. Maybe they're tired of being overlooked and think that by crossdressing, they can get more attention and build their confidence.
There could also be a supportive teacher who helps the shemale student navigate through the difficulties in high school. This teacher might be very open - minded and encourage the student to be true to themselves.