What to wear: A long, brown wig (and beard?) is in order, as well as a pair of horns (just stick some felt ones to a headband if you're in a pinch!). Wear brown shoes and brown pants, topped off with a frilly white shirt and a long, blue coat with gold designs on it (you can DIY those with some fabric paint).
How to act: Gruff, and ready to break into a performance of "Evermore" at any moment.