Stunfisk is a fish-like creature with a broad, flattened, mud-brown body and a yellow tail that is constantly held above its face. At the base of its tail is a yellow marking shaped like an upside-down exclamation mark. It has small, horizontal, oval-shaped eyes, white with a tiny black pupil and no irises. Almost exactly between these two eyes lies its mouth, which comprises of two thick grey lips. Finally, it has two small, flimsy fins at the sides of its body. These fins have two lobes.