Since we don't have the full story, it's hard to say who the main character is exactly. But it's likely the girl who is associated with the diaper in the hospital context.
The main character in the 'hospital diaper girl story' is presumably the girl herself. She is the focus as the story seems to revolve around her situation in the hospital while wearing a diaper. It could be a story about her experience, her feelings, and how she copes with whatever situation has led to her wearing a diaper in the hospital.
The main character is the girl. In this type of story, she is likely to be the one through whose eyes we experience the events in the ruined hospital. She will be the one facing the challenges, whether it's dealing with the spooky atmosphere, any strange entities she might encounter, or trying to find a way out of the dilapidated place.
I'm not sure specifically what the 'hospital diaper girl story' is without more context. It could be a story about a girl in a hospital who needs to wear a diaper perhaps due to an illness or injury that restricts her ability to use the toilet normally.
Since I don't know the exact story, it's hard to say for sure. But most likely the flower girl would be one of the main characters. There could also be her parents or guardians who are responsible for her and the diaper situation. And perhaps there are other people at the event, like the bride or groom if it's a wedding - related story, who interact with the flower girl and are affected by the diaper situation in some way.
I don't know who the main character in the 'diaper all day story' is as we don't have enough details. It could be a baby, a sick or elderly person, or even a fictional character in a made - up scenario.
The main character is presumably Diaper Man, as the title suggests.
The main character in the '88 girl story' is presumably the girl it's named after. However, without more information about the story, we can't know anything about her personality, her age, or what she does in the story.
It could also be a side character like Penny. If she gets damaged in a battle and is taken to the hospital for repairs. The story could focus on how the RWBY team reacts to her situation, and Penny's own thoughts as she is being fixed. Also, it could explore the relationship between Penny and the people in the hospital who are helping her.
Once upon a time, there was a little diaper girl. One day, she was playing happily in the nursery. All of a sudden, she felt that familiar urge. Her face turned a bit red as she started to poop in her diaper. Her mother soon noticed the smell and came over with a warm smile. She gently changed the diaper girl's diaper, and the little girl went back to playing as if nothing had happened.
It depends on the specific 'fasting girl story'. There could be many different girls in different accounts who are the main focus due to their fasting behavior.
Since it's called the 'Refugee Girl Story', the main character is likely to be a girl who is a refugee. But without more information, we can't say much more about her specific identity.