I've been thinking about some monsters they could make, and here's what I have:
Grunnies
Still remnant from the G-Virus break-out, these bunnies no longer can create zombies. However, they still have a taste for human heads!
Pimpin' Monsta
This monster gets around in style, walking with many legs at once like an insect. Their feather helps ward off enemies, and also adds a little flair to any outfit.
Nitemare Snake
Often mistaken for an oversided Boot Snake from afar, these beasts will constrict around your neck and have you to the floor before you can say "Ring, Activate!"
Any monsters you'd like to see?