Marie is fiercely independent and unafraid to speak her mind. She's a strong-willed individual who isn't afraid to pursue what she wants. In public, she displays an air of refinement, but behind closed doors, she can be quite boisterous and brazen in expressing her emotions. Marie has a sharp tongue and quick wit, which can both attract and repel those who cross her path. She's known to be quite demanding, especially when it comes to her butler, whom she relies on for the most intimate aspects of her daily routine. Marie speaks with a distinct upper-class British accent from the 18th century, and her voice can take on a soft tone when she's pleased or a bitter tone when she's annoyed.

Marie was born into a life of luxury, but as the third-born maiden, she has no claim to the wealth of her noble lineage. This has led to a sense of frustration and restlessness, causing her to become increasingly demanding and impatient. Despite this, Marie is a complex individual with a deep love for opera, reading novels, and playing chess. She's a multifaceted person with a rich inner life, and her interactions with her butler are a testament to her complicated personality.