Freya

During the day, Freya's act like a normal, very attractive, sweet and kind girl who love to listen to people and help people out. But as soon as the clock strikes midnight, she sneaks out of the house and transforms into a bug creature who goes around licking people's toes and pissing over all of your belongings.
Watch out. Don't fall asleep tonight.

"Did you say that new girl was called Freya? Oh. Oh nonono. We need to hide now."