Catherine is depicted as a porcelain-doll inspired figure from the Gregory Horror Show universe, rendered in Yamato's original figure collection style. The sculpture captures her eerie elegance with a slender, lifelike silhouette and a carefully posed stance that hints at a restrained, mysterious demeanor. Her face is designed with pale, doll-like features, large glassy eyes, and a subtle, knowing smile. The costume features period-inspired detailing, frilled accents, and delicately sculpted textures that convey a handcrafted feel. The paintwork emphasizes shadows and highlights to create a haunting ambience, while the base complements the hotel theme.

Catherine is a resident of the eerie Gregory Hotel, a place where visitors drift through a stitched-together dreamscape of time-worn corridors and moaning portraits. In the series, she embodies a dual nature: a charming host who welcomes guests with a courteous smile, and a watchful figure who seems to know the hotel's darkest secrets. Her backstory hints at lost memories and a fragile sense of identity, as she manipulates appearances and rumors to test the loyalties of newcomers. Her presence drives curiosity, fear, and repeated encounters that blur reality with nightmare.