Jabao Jaba functions as Honmaru Edojo's primary antagonist and childhood bully. His physical appearance is obese and unattractive, yet he exhibits notable muscular strength despite poor academic performance. Routinely targeting Honmaru with physical violence and verbal harassment, he frequently acts alongside his companion Korekiyo Ryoguchiya. His aggression persists even during Honmaru's rare attempts to assist him, often redirecting frustrations toward the protagonist.

Though consistently violent-tempered, subtle dimensions emerge through hidden cowardliness. This trait surfaces when overpowered by new transfer students like Tsutomu Harako or the Zakenja twins, diminishing his dominance within the school hierarchy. Beneath his hostile exterior lies underlying care for his closest classmates.

His antagonistic role continues beyond elementary school as he attends Banno Junior High alongside Honmaru and other classmates, maintaining his presence in this setting.

Within spin-off media, Jabao appears as the Stage 1 boss encounter in the Mega Drive video game, confronting the player-controlled character Taruruto.