Monster X is a bipedal creature with a white bone-like exoskeleton and black skin. Monster X has red eyes, a skeletal face, and long spikes on the top of his head. He possesses two small half-skulls on his shoulders and a long black forked tail. Monster X displays true malice in his battle with Godzilla, fighting viciously and relentlessly. He seems to take pleasure in causing Godzilla pain, such as when he breaks Godzilla's wrists and suspending him into the air.