It could be any character that the narrator is addressing or referring to. Maybe it's a friend, a lover, or someone with a significant role in the story.
It's hard to say exactly who the 'you' is. It could be a character introduced earlier but not clearly identified yet, or it could be a new character whose importance becomes clear as the story progresses.
I'm not sure specifically who the girl is without more context. It could be a fictional character created for a particular story, perhaps a girl who managed to escape from a difficult situation like a dangerous place or a bad relationship.
I'm not sure who the girl is in this 'girl in the log story'. It could be a young girl from a small village. She might be an adventurous type who is always exploring the woods around her village. And the log could be something she stumbles upon during one of her adventures, and from there, the story unfolds about her experiences with this log.
There's no way to tell for sure without more details. She could be an ordinary girl who becomes extraordinary through the events in the book, or she could be a princess, a peasant, or a girl with special powers.
I don't have enough information to say who the girl is exactly. She could be an ordinary girl who decides to take up motorcycle riding for the thrill.
Since there's no more information, I can't say for sure who the girl is. She could be anyone - a fictional character created for the story or a real person.
Since we don't have much information about the 'girl in the leaves story', the girl could be anyone. She might be a fictional character created by an author, or it could be based on a real - life girl who had an experience related to leaves.
There's no way to know who the girl is without more context. She could be anyone - a fictional character created for the story, or a real - life person that the story is based on.
The girl in the Napalm Girl story is Kim Phuc.
Since we don't have more details about the 'girl in room 105 story', the girl could be a young adventurer who has checked into room 105 for a night during her travels. Or she could be a student who is staying in a dormitory room 105 and has some interesting encounters there. It really depends on what the story is about.
Since I don't know the specific story, it could be any girl. It might be a young girl who is just starting to learn the mandolin and is full of enthusiasm. Maybe it's a girl with a dream of becoming a famous musician.