Corinna is a character from the lower city of Ehrenfest and plays a significant role as a merchant and master seamstress. She is the younger sister of Benno, the proprietor of the Gilberta Company, and the wife of Otto, a city gate guard. Corinna was originally trained to be the successor of the Gilberta Company, receiving a strict education from her brother, who acted as a father figure to her. However, after Benno established the Plantin Company to focus on new ventures like printing, Corinna took over the full management of the original Gilberta Company, which specialized in clothing and apparel.

In terms of personality, Corinna is perceptive and possesses a sharp, strategic mind for business. While she maintains a gentle and serene demeanor, often smiling during conversations, she is known for being a formidable and intimidating negotiation partner. Unlike her brother Benno, who directly points out weaknesses, Corinna is more subtle and indirect; she skillfully draws information out of others while keeping the conversation pleasant, a trait that makes her difficult to read and deal with. This calm and calculating nature is balanced by her genuinely caring attitude toward her family, particularly her husband Otto.

Corinna’s role in the story is primarily as a merchant and a skilled artisan. She is a high-ranking seamstress whose talents are admired by characters like Tuuli, Myne’s older sister. Corinna's workshop handles important commissions, including the sewing and adjustment of ceremonial robes for Myne when she becomes a temple apprentice. Her professional skills are highly regarded, and she employs Tuuli as an apprentice, recognizing the girl's potential and hard work.

Her key relationships heavily define her character. With Benno, she shares a deep trust and respect, viewing him almost like a father. With Otto, the relationship is warm and loving. He is a former traveling merchant who gave up his dreams to settle down and marry her. Corinna cares for him deeply and worries that he might regret giving up his merchant life for her, though she is reassured that he still utilizes his trading skills as a guard. She is the mother of two children, a daughter named Renate and a son named Knut.

Corinna’s development is tied to the expansion of her family and her business responsibilities. Her marriage to Otto was a strategic arrangement to help Benno refuse the advances of a guildmaster, but it evolved into a happy union. She eventually gives birth to Renate, who is considered the heir to the Gilberta Company, followed later by Knut. Her development also includes her growing yet wary business relationship with Myne, as she finds the young girl suspicious and her new ideas surprising, even as those inventions bring profit to her store.

Notable abilities include her exceptional skill in sewing, design, and managing a garment workshop. She is capable of executing complex commissions with tight deadlines, such as creating replacement ceremonial robes for a knight commander on short notice and charging premium fees for the rush service. Her true strength, however, lies in her social and business acumen, specifically her talent for conducting conversations in a way that extracts information and protects her interests without ever losing a polite, friendly facade.