One of the very few (nearly) pure-blooded crystal ponies remaining a thousand year’s after Sombra’s genocide, Sunset was orphaned at a young age and was forced to do whatever it took to survive. Still dreams of glory and grandure, and has admired the Goddess of the Stars for as long as she can remember.
Don’t let that smile deceive you; her sunny disposition allows her to pickpocket her targets all the more easily.