Does your story need a monster? Does a particular protagonist need a perilous problem?
Have I a tool for you.
The point is monsters. How about throwing The Nine Legged Cyclops from the abandoned mine shaft just outside of town into your short story? The Underwhelming Gaki from Atlantis perhaps? The sedated Cherub from Aglet Isle? Just a few possibilities.
Also; follow the “remix” link in the top corner to make your own generator. It is so much fun.