Popuko is a 14-year-old girl with a petite frame, orange pigtails fastened by yellow scrunchies, and a sailor uniform. Her bright yellow eyes narrow with contracted irises during fits of rage, mirroring her legendarily short fuse. Prone to explosive outbursts, she retaliates against trivial annoyances—banal comments, inconvenient weather, or perceived slights—with a nail-studded bat clutched in her fists. Beneath this volatility lies emotional nuance, particularly in her bond with Pipimi. Moments of separation or vulnerability, like her temporary transformation into a weeping tree, expose fragile tenderness beneath her ferocity.

Her combustible impulsivity contrasts starkly with Pipimi’s composed demeanor, creating a push-pull dynamic where mutual affection subtly tempers their interactions. Though prone to berserk rages, Popuko yields to Pipimi’s interventions—whether being physically restrained mid-attack or sheepishly seeking approval—hinting at romantic undercurrents and codependent loyalty that anchor her chaos.

Outside conflict, Popuko channels intensity into creative endeavors: operating YouTube channels, crafting amateur music videos, and briefly ascending as a glittering idol in one narrative thread. Even supernatural forces falter before her ferocity, as seen when she terrifies the spectral Mary-san into retreat. Her presence adapts fluidly across parodies and meta-humor skits, breaking fourth walls or warping reality alongside Pipimi for comedic effect, though such antics exist outside coherent storylines.

The character thrives in self-contained absurdity rather than continuity, with no defined origin or progression. Episodes spotlight her static traits—hair-trigger violence juxtaposed with sudden softness, chaotic antics undercut by artistic ambition—solidifying her role as an unpredictable comedic force sustained by contradictions.