Shem comes up with some interesting costumes. This year he was a Mad Scientist, he fits the part well.
Dan of course always has something to do with weapons. This year he is a Ninja Assassin.
(notice the book, I don't think his hands know what to do without a book in them.)
Isabelle wanted to be a hundred different things before she finally decided on a Creepy Ghost.
And Hannah, Wizard