Slum serves as one of Lord Zero's two primary henchmen, consistently partnered with Slim. Their physical appearances contrast sharply, with Slum being the shorter figure next to Slim's larger frame. Functionally, they act as incompetent subordinates whose mistakes and miscalculations habitually undermine Lord Zero's treasure-hunting schemes. These failures typically result in them receiving the blame. Despite recognizing that independent treasure searches might prove more successful, their defining loyalty to Lord Zero overrides any impulse toward self-interest. They perform demanding physical tasks for their lord and regularly engage in direct confrontations or competitions with the protagonists during treasure hunts. Their role remains consistent as bumbling antagonists, providing a persistent source of comedic opposition throughout the series.