Horror functions as the steadfast henchman of primary antagonist Baikinman, invariably appearing alongside him and Dokinchan across Anpanman media. He aids Baikinman in executing technological or mechanical schemes against Anpanman, typically operating machinery under Baikinman's command during their villainous collaborations.

In a critical incident, Horror directly activated a machine interfaced with Baikinman's heart system. This device malfunctioned catastrophically mid-operation, triggering Baikinman's explosive transformation and fatal demise. Horror and Dokinchan perished instantly in the resultant laboratory explosion. Horror's remains were portrayed as scattered bone fragments amid the devastation.