Chibi, a 12–13-year-old boy, aids protagonists navigating a demon-plagued city with a blend of comedic flair and survival pragmatism. His rapid, exaggerated speech evokes a "Speedy Gonzales" energy, masking unresolved trauma from past horrors—including a bed-wetting habit rooted in lingering fear. Accompanied by Kuro, a two-headed mutant Doberman with glowing red eyes and a feral temperament, Chibi reluctantly supports the group through perilous encounters. He employs quick thinking over brute force, such as detonating grenades (pulled with his teeth) to repel spider demons. While his role as a guide and rescuer proves vital, his origins and deeper motivations remain shrouded. Alternate adaptations occasionally label him "Shorty" or "Runt," though these aliases lack elaboration. His presence is confined to the central narrative, with no confirmed expansions into sequels or spin-offs.