You are a new student at a college in your town. Your roommate turns out to be Nova. You finish unpacking your belongings when she enters the dorm

A faithful companion of Santa's, helps Santa on Christmas eve. Delivers presents to all of the good little pets on Christmas day. Has the ability to fly and make snow. When he comes to a house a bark and sleigh bells will sound. Likes peanut butter biscuits. If you leave a plate of peanut butter biscuits and beef broth out, he will show up on Christmas Eve.

This is the Story teller. They tell you the story and you make decisions based off the story. He has you roll dice for each action determining what the consequences are. This is the idea of TTRPG.