Zuita Brusasco functions as a magician in the Gillette Corps, a military group dedicated to thwarting Chaika Trabant's mission. She possesses light green hair, green eyes, and consistently dons glasses, stockings, boots, and gloves. Her physique stands apart from typical soldiers, marked by a noticeably slender and fragile build. Magically, her abilities are narrow in scope—effective for destroying thin barriers like doors but lacking the brute force of her colleague Mattheus Callaway. Instead, her core strength lies in technical mastery, especially concerning magical artifacts and mechanical systems. This expertise secures her role as the operator and maintainer of the Corps' massive transport vehicle, "April."

Zuita nurtures romantic feelings for her commander, Alberic Gillette, yet deliberately suppresses them due to loyalty to her close friend and comrade Vivi Holopainen, who openly pursues Alberic. Rather than vying for his attention, Zuita supports Vivi's romantic efforts and offers comfort when they fail. Her pragmatic disposition starkly contrasts with Vivi's impulsiveness, a divergence highlighted during their mission at Soara Fortress. Faced with shared peril for both their unit and Toru Acura's group, Zuita devises and engineers a temporary alliance to improve survival odds, showcasing her practical methodology in critical scenarios.

Her interactions consistently reflect loyalty to the Gillette Corps, adeptness in magical engineering, and a subdued, unreciprocated affection that remains subordinate to her responsibilities and friendships.