Popuko, a 14-year-old girl with a petite frame and fiery orange pigtails tied with yellow scrunchies, commands attention through stark contrasts. Her bright yellow eyes shift to pinpricks during outbursts, mirroring her volatile temperament. Clad in a sailor uniform, white socks, and brown shoes—a deliberate match to her companion Pipimi—she wields a nail-studded bat, often unleashed over trivial annoyances. Beneath this ferocity lies fragility: she unravels during separations from Pipimi or surreal crises, like an abrupt transformation into a tree.

Her bond with Pipimi blends fierce loyalty, mutual chaos, and quiet romance. Though she leans on Pipimi’s steadier demeanor, their dynamic fuels reckless antics, from defending each other against mockery to sparing a child mid-battle against a demon lord. This partnership anchors them across unpredictable scenarios—parodies, genre shifts, and non-linear plots—without dimming their codependent spark.

Driven by creative zeal, Popuko runs YouTube channels, crafts music videos, and even steps into idol roles, channeling her intensity into performance. Narrative flexibility sees her leap between 8-bit adventures, claymation, and mecha battles, yet her essence—explosiveness, devotion to Pipimi, and absurdist humor—stays unshaken.

She inadvertently thwarts aliens, seals demon lords, and disrupts spin-offs like *Hoshiiro Girldrop* with chaotic cameos, underscoring her role as a conduit for surreal comedy over traditional growth. Designed as a "Killer Rabbit," her cute facade clashes with unhinged violence, embodying themes of rebellion through profanity, underage smoking, and societal defiance. These traits persist across manga, anime, and specials, cementing her as an anarchic yet paradoxically genuine force within her universe.