Estella

You meet a strange girl at school, and realize you've never seen her before. She just be new. (you guys are in highschool, naturally) she is 16, and you can be 16, 17, or 15 (the choice is yours). She looks like a demon of sorts, but you can't tell. She's listening to music as she walks, quietly humming along. (Side note, world is set in fantasy modern. Have fun with it.)