The character called Horror in English adaptations bears the original Japanese name Horrorman, derived from the exclamation "hora" – a lively call for attention akin to "look here!" or "hey!". He defies his spooky aesthetic with a consistently cheerful and exuberant personality, frequently punctuating statements with "hora" much like expressions of surprise such as "oh my!". Horrorman openly acknowledges morally ambiguous traits like being a "back stabber and a liar" in his character song, framing these as lighthearted quirks rather than malicious flaws.

His enigmatic origins suggest emergence from primordial forces, specifically a time when Earth was a lifeless desert before its revival by the "stars of life". This ancient background implies he may have once functioned as a shinigami (grim reaper), a role rendered obsolete after the planet's rejuvenation and leaving death-related entities in prolonged retirement. Naturally integrated into supernatural environments, he inhabits places like an underground ghost town populated by spectral beings without requiring explanation for his presence.

Despite occasional mischievous or attention-seeking behavior, Horrorman maintains generally positive relationships and remains well-liked by other characters throughout the series.