Mer-Man’s basic physical type can be described as humanoid, however he has aqua-marine coloured skin, that in some renditions appears to be of a scaly texture like a fish and yet on other occasions is depicted as being more smooth like that of a frog or salamander. He has webbed feet and hands and two fins on either side of his head that appear to be his species' equivalent of ears. He has large bulbous eyes like a fish and a wide, fang-filled mouth. He has no apparent nose, however in some representations he has nostrils. The area around his eyes and upper lip is covered in a layer of rough orange scales (in the animated series the orange scales only surround his eyes not his lip). He wears yellow chest armour that seems either to be made of fish hide or at least designed to look like it is. He also wears what can best be described as orange fish scale trunks. In the animated series he wears yellow gloves and boots, the original Mer-Man toy lacks this and instead goes barefoot and barehanded (in the early mini-comics he is shown wearing yellow anklets). Mer-Man has a muscular build and is at least as tall as an average human male. He is armed with a yellow sword that looks as if it is made out of coral or part of the armoured hide of some large fish.