Obviously, the girl in the tower is one of the main characters. There could also be a knight in shining armor who comes to rescue her. Maybe a wizard or a witch who has some connection to the tower, either as its keeper or someone who wants to use the girl's power for their own gain.
The girl and a group of small, intelligent dinosaurs like the velociraptors could be the main characters. The velociraptors might initially be curious about the girl and then they start to help her in her journey through their world. There could also be an old, wise dinosaur that gives the girl advice on how to survive in their world.
It could be two young people, like a college student and a barista. The college student often stops by the coffee shop where the barista works and they start to form a connection over time.
Often, it might include some classic Pokemon characters. Maybe Pikachu would be there if it's related to Ash's journey. But it could also introduce new characters that the author has designed specifically for this spooky tower - themed story. These new characters could be trainers with unique abilities or goals related to the tower, such as a trainer who has a special connection to ghost - type Pokemon and is determined to uncover the secrets of the tower.
Maybe there's a mysterious visitor who comes to the ward from time to time. This person seems to know something about the girl's past or has some connection to her that she doesn't remember at first. As the story unfolds, this visitor becomes a key figure in the girl's life in the ward.
It could be about a girl trapped in a tower and her journey to escape. Maybe she discovers hidden powers within the tower or meets mysterious characters that help or hinder her escape.
In 'the tower novel', the main characters could be diverse. There could be a protagonist who has a personal vendetta against the tower or what it stands for, perhaps because of something that happened to their family in the past. There could also be a sidekick character who is always there to support the main character, and an antagonist who wants to use the tower for evil purposes and is constantly trying to stop the protagonists from achieving their goals related to the tower.
The main characters could be a nerdy 'cherry boy' who is always buried in his books and a sporty girl. The boy might be really smart in academics but lacks social skills. The girl, on the other hand, is confident on the sports field but not so good in studies. They could help each other out, with the boy tutoring the girl and the girl teaching the boy how to be more confident in social situations.
I think Riley and Maya are the obvious choices for main characters. Riley with her wide - eyed wonder and Maya with her edgy personality. But Farkle Minkus could also be a main character in this fanfiction. His intelligence could be put to use in different situations in Texas, like helping to solve a local mystery or coming up with innovative ideas for a community project. Also, Smackle could join them, adding her own brand of quirkiness to the group.
The main character could be the girl who owns the stained socks. She could be a curious and adventurous girl who loves her unique socks. Another character could be her best friend who always teases her about the stained socks but secretly is quite intrigued by them.
Obviously, the little girl is one of the main characters. And a friendly dinosaur, like a small Stegosaurus, could be another main character. They are the focus of the story as they interact with each other.