Corinna is a skilled seamstress who co-runs the Gilberta Company with her husband, Otto. They live on the building's third floor and have a daughter, Renate.

She possesses pale cream-colored hair, typically styled in braids or buns, and silvery gray eyes. Noted for her beauty, Corinna has a gentle, feminine demeanor and a perfect hourglass figure. While her appearance contrasts with her brother Benno's harsher exterior, they share a similar sharpness in business.

Corinna presents a warm, approachable facade but demonstrates shrewd business acumen. She easily displays emotions on her face yet engages in strategic thinking, such as extracting commercially valuable information from Tuuli and Effa without compensation. This duality balances a gentle exterior with mercantile decisiveness. She becomes visibly enthusiastic discussing design and sewing, reflecting her passion for craftsmanship.

Orphaned during childhood, Benno raised Corinna. As the designated heiress to the Gilberta Company, she couldn't evade marriage proposals by leaving the city like her older sister. Otto, a traveling merchant, fell in love at first sight and persistently courted her. He relinquished his itinerant lifestyle, purchased Ehrenfest citizenship, and convinced her to marry. Corinna eventually developed genuine affection for him.

Corinna expressed concern about Otto's adjustment from merchant life to his role as a soldier and military accountant, confiding this worry to Myne to seek reassurance about his contentment. During their interaction, Corinna eagerly tested Myne's shampoo, leading Otto to expedite Myne's departure for private time with his wife. Later, she and Otto anticipated the birth of their first child, due in winter.

Her relationships include a close yet complex dynamic with Benno, who acknowledges her as the true successor despite his interim leadership. She maintains a supportive marriage with Otto. Corinna influences Effa and Tuuli, who admire her craftsmanship while remaining unaware of her business tactics.