Korekiyo Ryōguchiya is a short-statured elementary school student serving as a supporting character and sidekick to primary bully Jabao Jaba. His diminutive physicality contrasts with Jabao's larger build, yet he aligns with him in targeting protagonist Honmaru Edojo. Korekiyo exhibits a polite outward demeanor but frequently delivers sarcastic or mocking commentary toward Honmaru, utilizing proverbs, idioms, and witty remarks to undermine him.

His characterization prioritizes intellectual traits over physical prowess. While Jabao relies on strength for bullying, Korekiyo acts as a verbal instigator, ridiculing Honmaru's academic struggles, social status, or misfortunes. This role extends to the anime adaptation, where he regularly functions as an unofficial commentator during school sporting events or competitions, emphasizing his tendency for observational critique.

Despite his alliance with Jabao, Korekiyo shares similar social shortcomings, including financial disadvantage and unpopularity among female classmates—factors contributing to his alignment with Jabao. The narrative occasionally hints at underlying insecurities beneath his smart-mouthed persona, though his core traits of verbal mockery and loyalty to Jabao remain consistent. Significant character evolution or background details, such as family life or motivations beyond his bully role, are not elaborated. His involvement in broader plotlines—including magical conflicts or rivalries involving characters like Tsutomu Harako or the Zakenja twins—is minimal or undefined.

His presence in spin-offs, films, or expanded media like *Moero! Yuujou no Mahou Taisen* is confirmed but lacks substantive development or unique contributions specific to those appearances. He maintains his established role without additional layers or progression across the franchise.