Kyouhukou serves as the Area Guardian of the Black Capsule on the Great Tomb of Nazarick's 2nd Floor. He appears as a 30-centimeter-tall bipedal cockroach with its head facing forward, distinguished by a bright red cape embroidered with golden thread, a small golden crown, and a scepter bearing a pure white gem. He exhibits a polite, noble demeanor, speaking formally and maintaining gentlemanly conduct. This contrasts sharply with his role in psychological warfare, where he deploys summoned cockroaches to induce extreme fear and disgust. His primary ability summons vast swarms of cockroaches, numbering between 10,000 and 100,000, acting as a psychological weapon rather than a direct combat force. This tactic proves highly effective in confined spaces like the Black Capsule, overwhelming intruders. The summoned insects vary in size, with some reaching 150 centimeters in the web novel; their relentless assault can break even hardened individuals. Within Nazarick, Kyouhukou is classified among the "Five Worst" for creating the "Worst Dwelling." His room incorporates a trap that forcibly teleports individuals, particularly those with female exteriors, into his roach-infested domain. He is feared by other NPCs, including Shalltear Bloodfallen, who avoids his area due to visceral discomfort. Despite this, he maintains a working relationship with Mare Bello Fiore during interrogations and is respected for his knowledge of etiquette and noble customs, leading Ainz Ooal Gown to consider him for tutoring in royal manners. He notably fears Entoma Vasilissa Zeta, who consumes his roaches as snacks, calling her the "Predator of Family." His background includes creation by one of Nazarick’s Supreme Beings, with his design and room intended as a psychological weapon. During development, 28 out of 41 guild members expressed disgust, nearly triggering a redesign. Key chronological actions include torturing members of the Eight Fingers organization, like Hilma Cygnaeus, into absolute submission, and eliminating intruders such as the Heavy Masher workers by allowing his starving subjects to devour them after a polite conversation. In non-canon scenarios, he assists in events like the National Foundation Day Ceremony, providing dance tutelage to Shalltear and Aura Bella Fiora. In *Isekai Quartet 2*, Kyouhukou supervises detention for characters including Kazuma, Aqua, and members of the 203rd Imperial Mage Battalion after their attempted theft. He informs them his "children" will crawl on their bodies without causing physical harm, adhering to the world’s rules, leaving the detainees psychologically traumatized. Later, he invites Roswaal L. Mathers to tea, but the offer is declined. Trivia notes include his web novel designation as "Duke of Terror," his custom Silver Cockroach Golem mount, and his creator being Luci★Fer in that continuity. He is skilled in dancing and etiquette, traits utilized during Nazarick’s formal events.