Since I don't know the specific 'girl in blue story', it's difficult to say who the main character is. But as the title suggests, it's likely the girl in blue.
If the 'blue girl story' is a fable, the main character would be this girl who might be named something related to blue, like Bluebell or Azure. She could be facing challenges like dealing with mean characters in her village or trying to find a lost blue gem. However, without more details, this is just speculation.
Obviously, the main character is the girl with the blue ribbon.
The main character is the girl in 'the girl with the blue lantern story'. The blue lantern is probably an important element related to her. She could be a young girl with a curious nature. Maybe she is an orphan and the lantern was left to her by someone special. And all the actions and events in the story might be seen from her perspective as she goes about her life with this special blue lantern.
Obviously, the main character is the girl. Since the title mentions 'the girl with the blue mustang', she is likely at the center of whatever events the story tells.
Presumably, the main character is the ghost girl. Since the title focuses on her and it's her story set in the Blue Ridge Mountains.
Since we don't have much information about the 'the blue man story', it's difficult to say who the main character exactly is. But, given the title, it's likely that the blue man is the main character.
Since I don't know the exact 'blue king story', I assume the main character is the blue king himself.
The main character is Little Boy Blue.
Obviously, the main character is the man in the blue suit.
Given that it's called the 'little blue boy story', the main character is presumably a young boy. The 'blue' part could suggest that he has some sort of connection to the color. Maybe he has blue eyes or a blue outfit that is significant to the story. Without more information about the story, this is all we can really assume.