I like how Pia gives each character their own fashion sense, too - Hero has the most distinctive look, almost westerny. I could see a silhouette of Hero and still know it was her.

I also like that they gave Beth 2 a scar on her nose. Not only does it make you instantly recognize her, but it plays into her backstory. The scar will be a constant reminder of the plane crash and her role in it, so it lends her character strength. Every day she's faced with her shortcomings, but she continues on anyway.