Harry Potter Costumes Ideas?

My friends and I are going to the midnight premier and we all want to dress up, but we don't want to repeat any characters. I have friends going as Hermione, Luna, Bellatrix, Harry, and Draco and I have no clue who to dress up as. I don't particularly want to dress up like a guy as I've done it before, so any ideas are very welcome! I'm looking for a unique (I've seen people dress up like snitches) or easily recognizable costume. I have curly brown hair btw....