Bubbles and Smush, Trick or Treats

Bubbles and Smush are two medium sized monsters living in the river near WizTech, a school for wizards, dr'gons, and knights. The two friends are thrilled when their dr'gon friend Cl'rnce invites them to the Halloween party at the school. However, they need costumes, and this makes Bubbles wonder: what would he like to be in the future?