A01 is a bipedal monster covered with black, goo-like skin with a malnourished abdomen, his ribs bulging through his chest, slender limbs, three long fingers and a thumb on each hand, each tipped with a claw, and digitigrade legs tipped with hoofed feet. He also wears a light grey scarf and has loads of long, needle-like spines on his back. On his face he wears a white mask, mixing the design of a goat and horse skulls; his actual face has large eyes and a smiling mouth full of sharp teeth.