Horrorman recurs throughout the Anpanman universe, presenting a skeletal physique with distinct kneecaps, cheekbones, and exposed teeth. He typically wears a tattered long purple shirt displaying crossed bones on the chest. His personality radiates cheerfulness and a happy-go-lucky spirit, contrasting his appearance through clumsiness and underlying kindness, though he sometimes unintentionally wounds feelings with blunt remarks. He actively attempts to scare others, but these efforts consistently misfire due to his goofy nature, ironically causing accidental frights during ordinary actions. His speech habitually incorporates the exclamation "hora," used for attention or surprise.

He frequently associates with primary antagonist Baikinman, sharing living quarters, yet operates independently of Baikinman’s schemes. Horrorman harbors an obsessive infatuation with Dokin-chan, constantly seeking flowers and food to offer her, though these gestures remain largely unreciprocated. The crossed bones on his shirt function as removable boomerangs, deployable as weapons or tools.

Horrorman debuted in the manga and first appeared in animation in the 1991 film "Soreike! Anpanman Tobe Tobe Chibigon," mentoring Chibigon. He later joined the main anime series. His backstory remains largely undefined; a 2007 film short ambiguously suggested a princely past without narrative confirmation, while broader franchise lore speculates unconfirmed theories linking him to pre-life Earth and forgotten forces of death. He appears among the cast in the 2018 film "Soreike! Anpanman: Kagayake! Kurun to Inochi no Hoshi."