Rumiko Chie, a devoted teacher at Hinamizawa Branch School, channels fierce dedication into both her students and an all-consuming passion for curry. Amidst the dam conflict’s turmoil, she relocated to Hinamizawa, defying education board opposition to help establish the fledgling institution. Her grassroots collaboration with villagers and strategic alliances with the influential Three Families later secured the school’s legitimacy post-conflict.

Though approachable in daily interactions, her wrath ignites at any perceived disrespect toward curry, a trait that cemented her "Curry Demon" moniker. She cultivates a sprawling curry garden behind the school and spearheads culinary events like inter-class spice competitions. Her protective instincts surface prominently in defending Satoko Houjou, initiating child welfare interventions against Teppei’s abuses, though bureaucratic hurdles and official denials initially stall progress.

Navigating crises from unexplained student absences to diffusing Rena Ryugu’s classroom standoff, Rumiko’s resilience adapts to each challenge. While some timelines see her perish in the Great Hinamizawa Disaster, others depict her rebuilding life in Tokyo by 2004. The Saikoroshi-hen arc introduces an alternate reality where her presence coincides with Satoshi Houjou’s continued existence, subtly reshaping group dynamics.

Post-disaster, she covertly aids Keiichi Maebara’s protests against child services, leveraging her educator status to mobilize community action despite institutional risks. These efforts culminate in Satoko’s liberation and Teppei’s incarceration. Her postwar initiatives include facilitating Hanyuu Furude’s enrollment and mentoring student council transitions.

Visual and behavioral traits parody another franchise’s character through shared aesthetics and fiery temperament, though never addressed within the narrative. Spin-offs humorously amplify her intensity, depicting improvised kitchenware "weapons" during comedic escalations.