Contributed by Darth Cestual.

This list is based on the Gamma World 4th edition Base Animal Stock list and by no means complete, but does provide a wide variety of animal PC options. The animals presented here are assumed to be medium sized, unless stated otherwise, be of a general humanoid/bipedal form, and able to use most weapons and tools used by other human/demihuman races. Animals with the Aquatic mutation are considered to be adapted for land dwelling, and capable of surviving both in and out of the water. Other natural abilities will be listed as per Microlite20 Mutations.

Halfbreed races are a common staple of fantasy.

Half-Orc +3STR, -1MIND
Half-Elf +1MIND, +1 comm
Mul (Half-Dwarf) +1STR, +1 phys
Quarterling (Half-Halfling) +1DEX, +1 sub

Half-Fiend +3MIND, -1STR or -1DEX

Half-Stone Elemental +3STR, -1DEX
Half-Air Elemental +3MIND, -1STR
Half-Water Elemental +3DEX, -1MIND
Half-Fire Elemental +3MIND, -1DEX