This is Astera she is a Gaurdian assigned to serve Arela so that one day she may redeem herself and become an Angel of the Light!! She protects her master fiercely and is very easy to get along with but the main thing she doesn't know is that she is the daughter of Lucifer the King of the Demons!!
I bought this and other character from this person on DA!!: http://varriel.deviantart.com/