Obviously, the best little girl is one of the main characters. There might also be her parents, who could play important roles in her life, either guiding her or causing some conflicts.
Maybe there are her friends. They can be part of her journey, sharing joys and sorrows with her, and together they could create different storylines in the novel, like having adventures or dealing with school - related problems.
It could be about the concept of 'best' in a child's world. Maybe it shows how a little girl tries to meet the expectations of being the 'best' in terms of behavior, achievements, etc., and how she deals with the pressure.
The main character is a young actress who gets drawn into the world of espionage. There are also various intelligence agents who play significant roles.
The main character is the little drummer girl herself. There are also various spies and political operatives who play important roles in the story.
The father is surely one of the main characters. He might be a hard - working man, full of love and patience for his daughter. The daughter, of course, is another main character. She could be a curious, innocent girl. And perhaps there are neighbors or schoolmates who play important roles in the story as well, like a best friend of the daughter who helps her in some way or a kind neighbor who gives the father some useful advice.
It's possible that there are characters representing different aspects of society within this perfect little world. For instance, there could be a character who is an artist, trying to find inspiration in a world that seems too perfect and perhaps lacking in the chaos that often fuels creativity. And there might be a character who is in a position of power, dictating how this world should function.
There's also Smackle, who is Farkle's girlfriend at some point. She is highly intelligent and at first seems a bit aloof but eventually becomes more integrated with the group. Mr. Turner is another character. He is a teacher at the school and serves as a mentor figure to the students. These characters together form the core of the 'Girl Meets World' universe and drive the various storylines.
Riley Matthews is one of the main characters. She is a young girl going through the various stages of growing up.
I'm not sure as I haven't read the novel specifically. But it's likely that the main character is the girl who is the focus of the statement 'you deserve the world'. There may also be other characters like her friends who support her, or antagonists who try to hold her back from realizing she deserves the world.
In 'Nancy Drew', the main character is Nancy herself. She's a resourceful and determined girl detective. In 'Enola Holmes', it's Enola, who is very independent and intelligent. And in 'Theodosia Throckmorton', Theodosia is the main character, a girl with a special connection to the ancient artifacts she deals with.
Obviously, the little girl is one of the main characters. She is the one directly related to the biscuit.