There is the balloon man for sure. And usually there are children who are interested in his balloons.
The main characters are the balloon man and the children in the area where he sells balloons. The balloon man is the key figure, he is the one with the balloons. The children are the customers, they might be from different families and have different personalities. Some could be very eager and run to the balloon man as soon as they see him, while others might be more hesitant. There could also be other minor characters like the parents of the children who might have different reactions to the balloon man. For example, some parents might be strict and not want their kids to buy balloons all the time, while others might be more lenient and encourage their kids to have some fun with the balloons.
The main characters are clearly Richard and the balloon man. Richard is probably a child or someone who has an interest in balloons. The balloon man, as the name implies, is the person who has something to do with balloons, perhaps he sells them or uses them for some other purpose.
Well, in the 'balloon man story', the balloon man could be significant as a symbol of joy. He brings happiness to the people around him, especially children, with his colorful balloons.
I don't know for sure, but there could be a child who owns the big blue balloon.
There could be a young couple. The boy might be an artist who loves to create balloon sculptures, and the girl is charmed by his creativity and they fall in love.
Obviously, the boy is one of the main characters. He is the one who has an interaction with the balloon. And the balloon itself is also a main character. It's the object that the boy is interested in, and around which the story likely revolves.
Since I don't know the specific 'black balloon story', I can't say for sure who the main characters are. It could be a child, or maybe an adult who has some special connection to the black balloon.
Well, clearly the main characters are balloon boy and balloon girl. Balloon boy is often depicted as a curious and adventurous character. He might be the one to initiate most of the exploration in the stories.
As I don't know the exact 'big red balloon story', it could be a child as the main character. Since balloons are often associated with children, a kid might be the one who owns the big red balloon.
The main character is a boy. And of course, the red balloon is also like a character in its own right. The boy is the one who forms a special bond with the balloon.
Since I don't know the details of the story, it's hard to say exactly. But I assume the 'balloon boy' would be a main character.