In Cynthia’s first appearance, she has long red hair tied back and striking purple eyes. She wears glasses along with a beige jacket layered over a blue dress shirt, paired with black pants and white shoes. According to Ryota Kosawa, she is of British descent and stands at 5’7 (170 cm).

Cynthia is confident in her abilities and she takes pride in her sex appeal. She is outgoing, clever, and highly adaptable, drawing from her experience as both an aspiring stage actress and a skilled con woman. She can speak multiple languages and remains composed even in high–pressure situations, though she becomes flustered whenever someone calls her a cougar, which happens notably during the Singapore Sky case with Sam. While she is in her forties, she often behaves with the spirited energy of someone in her twenties. Her younger years reveal a fondness for art, influenced by her former partner. However, after their breakup, she developed a strong aversion toward artists and the art world in general.

As a young woman, Cynthia worked at a cafe where she met Thomas Meyer, a regular customer even before she began working there. Their relationship grew naturally and they eventually moved in together, living modestly on canned food while pursuing their dreams. Cynthia auditioned for stage roles while Thomas worked on original paintings, some inspired by Cynthia herself. Despite their efforts, neither found success. Thomas eventually caught the attention of James Coleman, who hired him to create forgeries of undiscovered paintings. As Thomas became more absorbed in money and his new work, he and Cynthia drifted apart. Their relationship ended, leaving Cynthia disillusioned.

Some time after the breakup, Cynthia found herself stepping into the world of confidence schemes. Her journey began when she attempted to flirt with Laurent at a bar, only for him to see through her instantly. Rather than exposing her, he invited her to join Team Confidence, setting the path for her life as a master con artist.