Horrorman appears as a skeletal figure clad in a tattered purple shirt, its chest emblazoned with crossed bones. Protruding cheekbones, visible kneecaps, and a permanently bared grin define his gaunt physique. His name originates from a Japanese pun merging "horror" with "hora"—an exclamatory phrase meaning "look here!" or "hey!"—which peppers his speech.

He shares residence with Baikinman yet carves his own path, favoring self-interest over true villainy. Though allied with antagonistic figures, his cheerful clumsiness drives his actions more than malice. His passion for startling others often backfires through accidental mishaps or comedic mistiming, with unintended frights outnumbering deliberate ones.

A persistent yet unreturned affection for Dokin-chan colors his interactions, which frequently disregard others’ emotions yet leave him oddly endearing. A Christmas special features him haunting a ghost town alongside spectral entities, hinting at nebulous ties to otherworldly realms.

Fanon speculation suggests a forgotten past as a shinigami, theorizing memory loss during a lifeless epoch preceding the series’ events. This aligns with in-universe lore about life-reviving "stars of life," though never officially confirmed. His character song playfully embraces dishonesty and betrayal as harmless idiosyncrasies, encapsulating his mischievous yet lighthearted essence.