Popuko is one of the two central protagonists of the anime Pop Team Epic. She is a fourteen-year-old schoolgirl of short stature with yellow or blondish-orange hair, and she is consistently described as quick-tempered and ill-tempered. Despite her small and comparatively cute appearance, she has a fiery and confrontational nature, and she does not hesitate to respond with exaggerated, comedic violence when provoked.

In terms of personality, Popuko is defined by her explosive temper, sharp tongue, and lack of patience. She reacts to both ordinary and bizarre situations with extreme overreactions, frequently voicing her disapproval through sarcasm and cynical commentary. Her catchphrase, "Popuko-piko!", serves as an expression of irritation or excitement. She has a tendency to jump to conclusions, a flaw that regularly lands her in trouble or leads to absurd misadventures. Her motivations are largely reactive rather than goal-driven; she is propelled by frustration, pride, and the urge to answer perceived slights, rather than by any long-term ambition.

Within the story, Popuko serves as one half of the central comedic duo, acting as a catalyst for chaos and conflict. She is usually the more aggressive and emotionally volatile of the pair, while her companion Pipimi is taller, calmer, and harder to shake, providing a contrasting foil. Popuko generally follows Pipimi's leadership during their over-the-top escapades, though her temper frequently drives the humor of their interactions.

Her most significant relationship is with Pipimi, whose composed demeanor balances Popuko's explosive personality. The two often engage in banter and share comedic misadventures together, and Popuko's confrontations with various other characters and parodies of popular culture figures also define her role in the series.

Popuko does not undergo significant character development over the course of the series. Her stories are episodic and lack a conventional narrative arc, so she functions as a consistent source of humor-driven chaos rather than a character who learns or grows over time. This consistency is central to her role as a comedic figure.

Notable abilities attributed to Popuko include exceptional physical strength and fighting prowess, allowing her to execute over-the-top combat maneuvers that parody fighting styles from anime and video games. Her approach to combat prioritizes absurdity and humor over realism. Along with Pipimi, she also frequently breaks the fourth wall, addressing the audience directly as part of the series' surreal comedy.