Karashi operates as a rabbit minion within the Animal Cruelty Hell division of the Japanese underworld bureaucracy. She specializes in torturing sinners convicted of animal abuse, demonstrating methods to new employees and enforcing discipline in her section.

Typically displaying a cute, soft-spoken demeanor, she shifts into a vicious and unstoppable frenzy upon hearing trigger words like "tanuki" or "badger." This reaction originates from her link to the Kachi-kachi Yama folktale, where a rabbit kills a tanuki to avenge a murdered woman. Her violent outbursts frequently escalate to physical assaults.

Her name reflects her invention of a painful bell-pepper-based ointment, applied to open wounds during torture. She maintains strict professionalism within the underworld hierarchy and ranks among its most ruthless torturers. Her duties and behavioral patterns remain consistent across all documented appearances.