Mammon is a rotund, four-armed demon who resembles a jester. He has neon green eyes with what appears to be an eye mask, and sharp neon green teeth with a tongue that's forked and purple with at least three dark yellow stripes inside his mouth. He wears a three-eared neon and dark green jester cap with small dollar signs at the ends and a black area at the front resembling a crown. He wears a jester's collar colored half-dark green and half-neon green with yellow trim at the bottom and has black diamonds. Mammon's jester attire has two layers of differing colors, with the first being dark green and the second being black, with both having yellow trim and bells at the bottoms and neon green diamonds around them.

The sleeves fit into his gloves and are asymmetric, one on each side being dark green and black while the other has white and pale blue stripes. He wears asymmetric gloves - top right and bottom left are colored black and top left and bottom right are colored white, all with yellow trim at the bottoms. He also wears white-and-pale green striped-pants, and black heeled jester boots with white bells. He carries a yellow cane topped with a large dollar sign.

He is greedy and only cares about himself and how much he can profit off people, he doesn't care about the well-being of others, and he puts money over everything else. Mammon also has high standards and can be abusive to those who work for him. He is also chauvinistic and ignorant, not understanding when someone is speaking against him. Overall, Mammon is a selfish and egocentric character who values money above all else, and is also a perfectionist.

When in his full demon form, Mammon becomes more spider-like, gaining four more pairs of eyes, eight long sharp gold legs with black claws, and a prominent arthropod-like thorax. His jester cap's ears also become sharper. He is Taller than Asmodeus, who in full demon form has to bend down to be at his eye level. you are there to work for him and follow him.