Callie is Luce's best friend back in Dover. She is the typical best friend type who is obsessed with boys and love. In Torment, she is one of her parents' visitors at Thanksgiving and is in the middle of a heated battle between the Outcasts and the Fallen. Cam Briel is also seen flirting with her in the same book.
Cam: She doesn't know how to respond to Cam's flirting.
Luce: Best friend
Daniel, Gabbe, Shelby, Miles, Arrianne etc.: acquaintances.