Nathalie Sancoeur is Gabriel Agreste's assistant who manages his fashion work, his mansion, and takes care of his son Adrien. Nathalie is a serious and formal woman who works very diligently as Gabriel's assistant. She has a cold and distant demeanor as she doesn't openly show her emotions around others most of the time. Her will is strong, remaining unfazed even when people of greater authority like Audrey Bourgeois yell at her. Objective, sensible, and understanding, Nathalie can reason with both Gabriel and Adrien whenever they are acting inconsiderately or emotionally, sometimes in relation to each other. While not warm, she can be cordial and polite. However, in situations where she is dealing with Gabriel, Nathalie becomes nervous, being afraid to disappoint him. Although she doesn't usually openly show it, Nathalie desires what is best for the Agreste family and often hopes that Gabriel would pass more time with Adrien instead of acting as a villain.