Sarah - ten years old, lives in a big orphanage with a couple dozen other kids in a rather depressing-looking building that is more or less always kept very cold. She likes to stay in bed a lot, and reads a lot of books in her room when she isn't at school and doesn't want to deal with the other kids. She likes music, too, particularly older 60s/70s music, and likes to hum the songs she listens to.
Alright, she has a blue wheelchair she pushes around herself to get around the house.