Well, since Starboy is often associated with certain science - fiction or superhero concepts, the graphic novel might revolve around his place in a particular universe. It could introduce other characters that are part of his story, like his friends or foes. Maybe it shows his journey to discover his true identity or his mission to save his world or a specific community. The art in the graphic novel would play a crucial role in bringing his story to life, with different panel layouts and styles to enhance the narrative.
I'm not sure which specific 'dear starboy' story you are referring to. There could be many works or personal stories with this name. It could be a fictional story about a boy with star - like qualities, or perhaps a name given to a particular relationship in a story. Without more context, it's difficult to tell the full story.
Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.