Grobletomus Marble-Eyes is a Cosmic Entity, and the God of the Concept of Life. His body's color is a dark shade of amethyst, and is somewhat similar to the shape of a cephalopod (squid, octopi, etc.). Furthermore, as stated by his name, he has marbles for eyes. When Runmo takes the head of Jumpmo's corpse for extra lives, Grobletombus appears, warping the environment around him and mocking Runmo for attempting to cheat death.