Since they've both been old enough to choose their costumes they have been similar characters. This year is no different, grim reapers. No princesses or fairies in our household, well at least I don't have to worry about skimpy costumes.
Last year it was Darth Vader and a Storm Trooper. I searched everywhere for the Darth Vader helmet and thankfully a friend had one. I think this was my favorite halloween costume duo. It just worked!