The heir to the fictional kingdom of Belgonia who navigates a dual life, embodying the persona of Lady Crystallia to enjoy Paris's nightlife. This character grapples with familial expectations while seeking to express true identity through fashion.

The traditional and assertive King of Belgonia, who initially prioritizes his son's expected role in society and royal duties. He embodies the conservative social and familial expectations of the time.

A hyper-masculine prince who serves as a foil and antagonist, highlighting the pressure of traditional gender roles in the story. He exhibits boorish behavior and challenges the protagonist's secret.

A seasoned costume designer for the Paris Ballet whose bold work inspires the young designer protagonist. She represents the potential for innovation and success in fashion design.

A diplomatic and friendly princess of Monaco, whose visit serves as a catalyst for exploring romantic and social themes. She interacts with several key characters and is a fan of innovative fashion design.

The pragmatic son of a department store owner who values commercial success over creativity. He is directly involved in a significant fashion event that affects several characters.

A palace official who knows the secret of a key character and assists in facilitating their adventures. He provides steady and calm support without judgment.

The perpetually supportive partner of King Leroy and mother of the protagonist, who conveys pressure through her eagerness for her son's betrothal and societal success. She reflects the familial dynamics and expectations in the story.