He is a man with swarthy skin who stands about 6'6", is built like a truck, and has a big black mustache. From the side of his head down to the bottom of his jaw, he has bone protrusions that look like a heavy gear.
He is very sensitive about his appearance. He has terribly knees from carrying around enormous brass junk.
The bone protrusions were a result of genetic meddling that gave him his superhuman strength. In Vol. 1 Fashion Disaster, Puck erased his memory of a time without the bone protrusions including when he was raising his son Coghead.