The obvious main character would be the paper boy. He could have a family, so his parents or siblings might be important characters too. For example, his father might be unemployed and the paper boy feels pressured to do well in his job to help the family. There could also be a rival paper boy in the area, competing for the best routes or the most customers, and this rival could be a main character in the story as well.
I'm not sure who the specific boy is without more details about the story. He could be an ordinary boy with a vivid imagination.
Perhaps the main characters are a young couple. In a story about love and creativity, the two of them could be involved in making paper stars together, with each star representing a moment in their relationship. It's also possible that the main character is an artist who uses paper stars as part of their art, and the story follows their creative process.
Since I don't know the details of the 'paper star story', I can't say for sure. It could be a little girl who loves making paper stars as the main character.
Since I don't know the exact 'paper man story', it's hard to say. But likely the paper man himself is a main character. There might also be someone who created him, if it's that type of story.
In the 'paper man story', the paper man would be the central figure. There could be his friends, like a paper bird that can fly and gives him advice. And there may be an antagonist, for example, a pair of scissors that chases the paper man because it wants to cut him up. These are all possible main characters in the 'paper man story' based on different possible plotlines.
I'm not sure specifically as it depends on the 'paper girls story' in question. But usually, there would be the paper girls themselves. Maybe there's a leader among them, a shy girl who gradually becomes more confident, and a tomboy who is always ready for an adventure.
Well, in the paper boy story, there are several challenges. Firstly, the physical aspect of carrying a large stack of papers and cycling around for a long time can be tiring. Secondly, the paper boy has to be very accurate in his deliveries. If he gets the addresses wrong, it can lead to complaints. Thirdly, competition from digital media could be a challenge in some cases. As more people turn to getting their news online, the number of paper subscribers might decrease, which could potentially affect the paper boy's income.
The main characters could be a family of paper dolls. For instance, there might be a mother paper doll, a father paper doll, and some little paper doll children. They all have different personalities and roles in the story. The mother might be very kind and take care of the family, while the father is strong and protects them from any danger. The children could be curious and always getting into little adventures that sometimes lead to trouble for the whole family.
Since I don't know the exact 'paper tiger short story', I can't say for sure. It could be a protagonist who discovers the 'paper tiger' nature of someone or something, and there might be an antagonist who is initially seen as a big threat.
It could be a young couple. Maybe a boy and a girl who are in love. The girl might be the one folding the 1000 paper cranes for the boy, or vice versa.