Naoko Watanabe, a 16-year-old girl, possesses the volatile ability to morph into Gauko—a fiery, dinosaur-like entity—when overwhelmed by anger or frustration. In her human form, she sports curly brown hair, black eyes, and a cheerful wardrobe: a yellow dress top with a white collar and a pink skirt. Transforming into Gauko strips away her footwear, though an unexplained anomaly during one event left her shoes intact, hinting at possible animation inconsistencies. As Gauko, Naoko channels aggressive power, wielding superhuman strength, scorching fire breath, and near-indestructible durability. Her capabilities escalate with rage, enabling colossal growth and heightened senses like smell. While Gauko’s actions often mirror Naoko’s anger, the creature occasionally exhibits autonomy or emotions like fear and joy, blurring the line between separate entity and primal extension of her psyche. Naoko’s life orbits her relationships. She navigates a quiet crush on the composed Toshio Hiraga while relying on loyal friends Kana and Erika, who embrace her chaotic transformations. Antagonists test her resolve: the mischievous Takashi Yamada, who taunts her into outbursts, and the alien Bibilian, whom she fiercely opposes. Familial bonds anchor her, including a brother-like dynamic with Leonard and a playful rivalry with cousin Ichiro. Struggling to balance normalcy with her explosive alter ego, Naoko battles to suppress Gauko’s emergence, fearing collateral damage. Critical moments—trapped in dinosaur form, clashing with the robotic Mecha Gauko, or strategizing during crises—push her to harness Gauko’s destructive force for good. These trials chart her slow acceptance of this duality, blending raw power with teamwork to defuse conflicts. Her journey intertwines mundane adolescent trials—friendship hiccups, parental miscommunications, romantic flutters—with the chaos of uncontrollable transformations. Subtle shifts, like referring to Gauko in the third person or fluctuating command during metamorphosis, trace her evolving grasp of this shared existence. Expanded through merchandise and spin-off media, her world retains core themes of identity and connection, reflecting her relentless tug-of-war between ordinary life and extraordinary fury.