Stupendous Slay, also known as Stu or Slay, is an old friend of King Allfire, who decided to join the circus.
In Slay the Dragon, his knife-throwing act was called Slay the Dragon. Dressed as an executioner, he would throw his knife to miss whoever was on the wheel. King Allfire volunteered to be the target in this knife-throwing performance.
- Stu's tail is never seen until after he removes his mask and is revealed to be a dragon.