What the tin says: you get a random character (or trope, if you're going original) and a roll they fill. For example, your generic cinnamon bun is your antagonist, or Jessie from Team Rocket is actually a spy for the Pokemon League... Give us the details (as generic as fandom vs. original, and as specific as a particular world you've set up with all its rules) and we'll give you something to go along with it.