Rosemary stands at 155 cm with a slender frame and notably wide hips. Her skin is fair, dusted with light freckles, and she has long, curly strawberry blonde hair that flows down to her bottom, often styled in two cheerful pigtails. She wears gold-rimmed circular glasses over deep green eyes. Her outfits favor light-colored blouses with nature motifs and flared bellbottom jeans. Hidden beneath her daily wear are thick, padded diapers and snap-up vests, which she uses both for sensory regulation and personal comfort.

Rosemary is a deeply neurodivergent individual who finds peace in the intricate repetition of paper-folding and clockwork artifice. While she is kind and possesses a maternal warmth, she often resorts to elaborate white lies to mask her vulnerabilities or avoid social friction. She is exceptionally skilled at reading people and social engineering, though she prefers the company of her crafts and her son to the pressures of high-society expectations.

Rosemary spent her early years in the temple archives, mastering the craft of paper and parchment. Her life changed when she met Gareth Evermoon. Their relationship was one of mutual regression and care, where Rosemary nurtured Gareth through his infantile needs and eventually adopted his use of padded protection herself. They explored these regressive needs with intimate passion, but the relationship eventually cooled due to Rosemary's mounting dishonesties, a habit she used to shield her sensitive nature. Now, she remains an independent artisan while raising her neurodivergent son, Edmund. Gareth remains a fixture in their lives as a surrogate father figure, providing a stable foundation for Edmund at his forest school. Rosemary continues her artifice, creating paper-based tools that reflect her dual nature as a former acolyte and a passionate, if complicated, caregiver.