Similar to the Fish Monster, the Fire Monster is a worm-like creature with red skin. It has oval eyes and sharp teeth. The rest of its body is unknown because it swims in the lava, though it likely has a similar build to its aquatic variant.
In "Don't Pierce My Flesh", it eats Flower when she runs into it and Firey when he falls off the pole.
- The Fire Monster was also a recommended character recommended by monkeymonful, FlykydFly, and RochelleClawz.