What's really ironic with her is that she is not supposed to be human, yet she is more human in appearance and behavior than anyone else in the film. All the other characters including her adoptive parents appear more cartoony and lack her realism. The only exception I'd make is Sutemaru. whom she was closest too after all. I hope I'm not the only one who noticed this.
P.S. I originally wrote this in the comment section but since that closed, I had to find a new place for it.