Monster Shark was an enormous shark, resembling a Great White Shark. Unlike a Great White Shark, it had only four rows of teeth. The teeth in the front were larger, and presumably stronger, than than the ones in the back. Its gills were on its right side of the body. It also had spikes sticking out from the back of its body.
Monster Shark seemed to be quite aggressive and fierce, as Omori remarked that he could not go into the water at night, as the shark was in the water. It also attacked Jaco the moment it saw him.