Erica Brown serves as an Auto Memories Doll at the CH Postal Company, working alongside colleagues Violet Evergarden, Cattleya Baudelaire, and Iris Cannary. Her duties involve transcribing clients' thoughts and emotions into written letters.

Timid and plagued by significant professional self-doubt, Erica is easily swayed by others and takes criticism deeply personally, often worrying inwardly about client interactions. Despite this, she possesses a strong-willed, thoughtful, and kind nature, capable of firmly standing by her own opinions when necessary.

Physically, Erica has light brown to honey-colored short hair styled in a chin-length cut with straight bangs. She wears round, transparent eyeglasses over her medium amber-colored eyes. Distinguishing features include freckles on the bridge of her nose and a small mole beneath her lip.

Her motivation for becoming an Auto Memories Doll stemmed from inspiration by a novelist, leading her to aspire to create written works capable of resonating deeply with people's hearts. Within the CH Postal Company, Erica maintains professional relationships, acting as a supportive figure offering empathy and guidance, particularly towards Violet Evergarden. Her role primarily involves background contributions to the company’s operations.