I'm not entirely sure as I haven't read it thoroughly, but typically in a story like this, there would be a group of girls who are friends. They might be the ones running the cupcake business or involved in the cupcake - related activities.
In the 'cupcake diaries graphic novel', the main characters are probably girls with a love for cupcakes. There may be a character who is the creative force behind the cupcake ideas, thinking up unique flavors and designs. Another character could be the organized one, handling the orders and the business side of things. And perhaps there's a character who is more of the social butterfly, spreading the word about their cupcakes. Their interactions and relationships would form the core of the story, as they navigate the world of cupcakes, school, and growing up together.
The main characters in the 'cupcake diaries graphic novel' are likely to be young girls. Since it's related to cupcake diaries, they could be girls who share a passion for cupcakes. Maybe there's a leader - type character who is really into baking and coming up with new cupcake recipes. And there could be her friends who help with marketing the cupcakes, or they all work together in a cupcake shop. They would probably have different personalities that add to the story, like one might be shy but great at decorating cupcakes, and another could be outgoing and good at talking to customers.