Kichiza Abashiri, the youngest and smallest Abashiri, possesses a perpetually mean facial expression. Unlike his physically combative siblings Kikunosuke and Naojiro, he specializes in explosives and deceptive tactics, notably employing a special disguise cloth that doubles as an explosive device. His demolition expertise proves critical during the family's criminal operations, such as bank heists, where he uses the explosive-laden cloth to breach vaults or incapacitate adversaries.

His involvement becomes pivotal in the Paradise School storyline's climactic confrontation. Initially absent for much of the conflict, Kichiza arrives later to decisively intervene when the family faces overwhelming opposition. Utilizing his signature explosives, he eliminates multiple hostile teachers and disrupts the antagonists' plans, directly enabling Kikunosuke to confront and defeat the primary antagonist. This underscores his role as a strategic asset in extreme situations despite his youth.

Within broader narrative contexts, Kichiza occasionally participates in the family's comedic or chaotic domestic moments, like spying on his sister or joining celebrations. However, these instances do not alter his core characterization as the explosives specialist. He consistently maintains his role as a supporting figure whose primary narrative function revolves around applying his demolitions skills in service of the family's objectives.