Guess that makes me the Devil.
-- Angel (chapter 1)

Importance: Angel’s reference to himself as the Devil is both a pun on his forename and a reflection of the central conflict at the heart of his character. Angel is a good person who is required by his circumstances to do bad things: an angel playing a devil.

You can live with us, you know,” Anna said. “Arvind can arrange it through the National Professionals Program. You can come to the university first. With your credentials, you’d be a shoo-in for visas.
-- Anna (chapter 5)

Importance: Lucy’s sister Anna reminds her that she can leave Phoenix and move to Vancouver whenever she wants to. Lucy’s options in life make her perspective on the world fundamentally different to the perspectives of Angel and Maria who must fight for their own survival, sometimes requiring them to do immoral things. Lucy has the luxury of moving somewhere safe...