Horrorman is a recurring skeletal character clad in a purple tattered shirt displaying crossed bones on the chest. His design emphasizes prominent cheekbones, kneecaps, and a permanently visible set of teeth. A bone boomerang embedded in his chest functions as his primary weapon, detachable for throwing.

He possesses a happy-go-lucky and clumsy personality. Despite his appearance, he is easily influenced and frequently struggles to achieve his goals. He enjoys attempting to scare others, but these intentional efforts typically fail. Unintentional scares occur more often due to his accidental actions. Generally well-meaning, he can nonetheless inadvertently hurt feelings through bluntness. His speech features the frequent use of "hora," a verbal tic expressing exuberance or calling for attention.

He resides with Baikinman and shares an affinity for Dokeen, often trying to impress her by gathering flowers or food; these efforts usually end in failure. While associated with antagonists, he does not consistently engage in villainous activities and maintains friendly relationships with other characters despite occasional mischievous behavior.

His origins are largely undefined. One established movie backstory positions him as a mentor to Chibigon, not incorporated into the main series. A 2007 film short suggested he was once a prince, though the source character's questionable credibility makes this unreliable. An alternative theory from an episode proposes he may have been a shinigami (death spirit) who lost his memories during a prehistoric era when Earth was a lifeless desert, prior to its revival by the "stars of life." This theory remains speculative and unconfirmed within official lore.