Apocalymon takes the form of a blue-skinned humanoid wearing a black cape with red trimming, a grey helmet with yellow markings, and a scar on its left eye. Its arms are long with black bands on the forearms and its hands are larger than normal hands, and have red claws. Its hair is a dirty white, and it has yellow eyes. From the waist down is a giant polyhedron the size of a planetoid that can bring out giant metal claws on DNA-shaped chains. It also has legs and can, in fact, separate from the polyhedron body.