The main character is usually the demon king or a potential demon king. There may also be teachers or other powerful demons at the academy.
In the 'demon king academy novel', the main character is often at the heart of the story. This could be a demon who has been asleep for a long time and wakes up in the modern - day academy. Alongside them, there are other important characters. For example, there could be a female demon who becomes the protagonist's friend or love interest. There may also be a group of sidekick - like characters who are not as powerful as the main character but have their own unique skills. These characters together create a complex web of relationships and storylines within the novel.