There might be a bully character who makes the shrunken student's life even more difficult. And also a science teacher who could be involved if the shrinking has something to do with a science - related incident. The shrunken student is likely to be the central character around whom the whole story revolves, facing different challenges from various characters in the high school setting.
It could be about a character who experiences shrinking during high school and the various adventures or challenges that come with it, like dealing with bullies in a new, smaller size or trying to find a way to reverse the shrinking.
In 'ghoul school interactive story', the main characters could be diverse. There might be a new ghoul who has just transferred to the school. This ghoul would be trying to adapt to the strange environment. Then there could be an older, more experienced ghoul who acts as a mentor to the newbies. There may also be some antagonist ghouls who create problems for the other characters, like a bully ghoul who tries to steal other ghouls' magic items or a jealous ghoul who wants to be the best in everything.
Since I don't know the exact story, the main character is likely the shrunken teacher. There might also be students who play important roles as they interact with the shrunken teacher in unexpected ways.
Maybe the main character is a new student in high school. Just as they are trying to adjust to the new environment, they get shrunk. This adds an extra layer of complication to their already challenging situation of fitting in and making friends. They then have to navigate the school while being small, which could lead to some interesting and unique interactions with other students.
In the shrunken environment, the girls can interact in many ways. They can swing from threads of a spider web if they are careful. They can dig through piles of dust or crumbs which are now like mountains. They might also build small shelters out of things like tissues or pieces of paper. They could use the static electricity on a balloon to propel themselves from one place to another. Also, they can explore the insides of small appliances or toys that they couldn't before when they were normal - sized.
There could be a new student who has just transferred to the high school. This character is usually the one through which we get to discover the different aspects of the school, like the different cliques and the school's traditions. And then there may be a teacher who plays an important role in guiding the students, not just academically but also in their personal growth.
There's often the popular kid. This person is usually good - looking, well - liked, and involved in many school activities.
I'm not entirely sure, but there are likely to be some cool monster characters like Draculaura, a vampire. She's usually a popular character in the Monster High universe.
The obvious main characters would be the little sister herself. She could be a sweet and curious girl. And of course, her crush. He might be an older boy in the neighborhood, like a teenager who is kind and helpful. There could also be a villain, perhaps an evil wizard who caused the shrinking in the first place.
The main characters would obviously be the shrunken man and the giantess. The shrunken man could be an ordinary person, like a school teacher or a mechanic, who suddenly finds himself in this strange situation. The giantess could be a powerful being, perhaps a queen in her own world, with a kind heart despite her intimidating size.