The light - hearted and often humorous stories. For example, the way her classmates try to understand her and the comical situations that arise from miscommunications. It also has a great art style in the novel illustrations that enhance the overall appeal.
Sure. Volume 1 is a great start as it introduces the main characters like Komi-san who has difficulty communicating. It sets the tone for the whole series with its cute and relatable stories.
One popular theme is Komi-san's attempts at making more friends. Another could be Komi-san's experiences in different social situations outside of school. Also, fanfics might focus on the relationship between Komi-san and Tadano developing further in various scenarios.