Namiko stands among Rikka Takarada's closest friends, consistently appearing alongside Hass within their social group. She possesses a cheerful and outgoing personality, frequently engaging in teasing behavior directed at Rikka, especially concerning Rikka's interactions with Yuta Hibiki. This playful dynamic surfaces when she and Hass witness Rikka and Yuta together at a convenience store, leading to recurring lighthearted mockery. Namiko also demonstrates an outspoken nature, such as questioning their teacher upon suspecting Rikka might invent imaginary friends. Physically, Namiko has short brown hair secured by a red hair clip and bluish-purple eyes. Her standard outfit is a white shirt tucked into a black skirt, accented by a black and red patterned tie with sleeves partially rolled up; she typically ties a red sweater with white stripes around her waist. During a mountain field trip, she wears a red bikini top featuring white stripes and zigzag patterns paired with black shorts. Her recorded statistics include a height of 150 cm, a birthdate of July 10, and blood type O. Throughout the series, Namiko undergoes repeated memory resets following kaiju attacks orchestrated by Alexis Kerib. After each incident, she forgets the attacks entirely and loses awareness of any classmates who disappeared or were erased from existence. This cycle of memory alteration persists until Gridman defeats Alexis Kerib, after which her life in Tsutsujidai presumably returns to a stable routine. Her character design incorporates intentional references to Transformers lore, specifically Shattered Glass Starscream, with her red hair clip resembling a Transformers Cybertron Cyber Key from the Unicorn Trilogy. She participates in the duet character song "Oh! My Hero!" with Hass, included in the SSSS.GRIDMAN BEST ALBUM but not released on a standalone character-song CD. A voice drama reveals she previously watched the television program *Ultraman Retsuden* with her brother. She does not appear in subsequent Gridman Universe installments like *SSSS.Dynazenon* or the *Gridman Universe* film.