There could be his parents. His mother might be the one who gives him the pinafore to wear, either for a practical reason like protecting his clothes while he does some messy activity, or for a more sentimental reason. His father could have different reactions, either supportive or a bit confused at first.
The story might also have a teacher as a main character. If the boy wears the pinafore to school, the teacher could be an important figure. The teacher might be very open - minded and encourage the boy's individuality, or might be more traditional and try to enforce the school's dress code which may or may not allow a boy to wear a pinafore. Another possible main character could be a friend of the boy. The friend could either be inspired by the boy's choice or might tease him at first but then come to understand his reasons.
Well, perhaps the boy is in a play where he has to wear a pinafore for a role. Maybe it's a period - piece play set in a time when boys sometimes wore pinafores.
Well, Cyborg could also be a main character. He and Beast Boy are good friends, and Cyborg might have to adjust to his friend's new appearance and the changes that come with it. And then there's Robin. As the leader, he would need to deal with how Beast Boy's transformation affects the team dynamics. Maybe he has to figure out new strategies that take into account Beast Boy's new situation.
A talking parrot might be a main character. The parrot has a sassy personality and knows all the gossip of the jungle animals. It helps the boy communicate with other animals in the jungle as it can speak multiple languages. It also adds a bit of humor to the story as it makes witty remarks about the boy's actions.
Obviously, the main character is the boy who wears the dress.
One of the main characters could be a scientist. When the martian boy falls to earth, the scientist might be the first to discover him. The scientist would be curious about the boy's physiology and technology from Mars. Another character could be a young girl. She could befriend the martian boy and teach him about human emotions and relationships, which are very different from what he has on Mars.
Another character could be a villain who is hunting down any remaining Targaryens. He sees the orphan boy as a potential threat because he might grow up to claim power. This villain adds conflict and danger to the story, forcing the orphan boy and his newfound friends to constantly be on the run and develop strategies to outwit him.
There could be a Capitol official who has a strange fascination with the pizza boy. This official might try to manipulate the games to either help or harm the pizza boy, depending on his mood. Also, a tribute from a rich district who initially sees the pizza boy as an easy target but later realizes his unique skills could be an interesting main character. The rich tribute could then form an uneasy alliance with the pizza boy.
Well, an important character could be the scientist or the person responsible for Beast Boy's powers if his origin is due to some experiment. This character could be either a friend or a foe in the story. There may also be some sidekick characters who look up to Beast Boy and learn from him. These characters can add a bit of humor and light - heartedness to the graphic novel. And don't forget any magical or otherworldly beings that might interact with Beast Boy, like a powerful wizard or an alien entity that plays a role in the story.
One popular character could be the girl who befriends the werewolf boy. She often serves as the connection between the werewolf boy and the human world. Another might be the werewolf boy's mentor or an older werewolf who teaches him about his heritage. And sometimes, there's a villain, like a hunter who is after the werewolf boy, which adds conflict to the story.
The main character would obviously be the boy who is going through the makeover. There could also be a best friend who either encourages or discourages the makeover. And perhaps a makeup artist or a stylist who helps in the transformation process.