The Slime Monster, as its name implies, is nothing more than a green blob of slime. It also has a red eye.
Kirby Vs. Shy GuyEdit
The Slime Monster only appears in The Search for General Guy's Base, where Kirby and Yoshi looks for General Guy's hideout. Kirby looks under many rocks, and the Slime Monster is under one of them. Kirby says it's the "wrong rock" when he sees the monster. He places the rock back where it was, and the monster looks as if it were killed or squished. The Slime Monster has never appeared in any other Kirby Vs. Shy Guy comic ever since.