The monster looks like a rather deformed Squidward with missing teeth and plus-shaped pupils. It also appears to be a bit overweight. It seems to have a shriveled up nose and a flabby head. Unlike Squidward, the monster does not have any clothes on and appears to be bigger than most life forms in Bikini Bottom.
The monster resembles and was created in a similar way to how Victor Frankenstein's monster was created in the book Frankenstein.