What to wear: One of the most striking things about Lydia is her spiky bangs and wild black hair, so that's a must. As far as clothes, get a long, fluffy red dress and matching veil (peruse a few thrift stores to see if any old prom dresses are for sale!), or go for her all-black look: a lacy black dress, tights, a big hat, and a camera hanging around your neck. And make sure to play up your black eyeliner.
How to act: Lydia is odd and mostly a loner, so you might want to roll solo. Halloween is also likely one of Lydia's favorite holidays, so be enthusiastic about any ghosts, demons, or paranormal things you stumble upon.