Why does Shadow call Aurora "Light"?
Shadow first meets Aurora when she travels back in time and to protect her identity, she goes by the alias "Light," so that's what he knows her as. He continues to call her that even when they meet "again" in the future and he learns her real identity.
But Aurora only uses the alias "Light" when she goes to the past because that's Shadow's nickname for her.
(It's the Bootstrap Paradox)











