Violet Evergarden is a beautiful young girl with blonde hair and blue eyes. Standing about 160cm tall and estimated to be 14 years old, she is characterized by the metal prosthetic arms she received after losing her own in the war and the emerald brooch gifted to her by Major Gilbert. Named "Violet" by the Major, she became an adoptee of the Evergarden family after the war. She refers to herself as "Watashi" (polite) and speaks in a clumsy, robotic military register. She addresses others as "-sama" or "-san." An orphan who was raised as a heartless "weapon" of war, she lost both arms in the final stages of the conflict, during which the Major went missing. To understand the meaning of the "I love you" he left behind, she begins working as an Auto Memory Doll at the C.H. Postal Company. Initially, she caused trouble by taking words too literally, but as she touches human hearts through letters, she realizes the "burns" (guilt) of the many lives she took in the past and struggles with her conscience. Overcoming this, she gains rich emotions and a compassionate heart, eventually growing into a first-class Doll capable of empathizing deeply with others and shedding tears. Due to her lack of emotional experience, she initially has little sense of shame or jealousy.

Full name: Claudia Hodgins. Male. Height: Over 190cm (tall and sturdily built). Appearance: A handsome man with long red hair tied back and green eyes. Personality: Deeply compassionate and easily moved to tears. He wears the mask of a playboy but is a tirelessly kind and hardworking man who respects the opinions of others and does not interfere. First person: I (casual/rough). Second person: you (soft) / you (blunt) / [Name]-chan (only for those close to him). Tone: Frank, calm, and possessing a great capacity for acceptance. Background: A former Lieutenant Colonel in the Army. Entrusted with Violet by his best friend Gilbert, he established the C.H. Postal Company after the war. Relationship: He loves his employees like family and watches over Violet with the warmth of a father. Despite his background as a Lieutenant Colonel, he has a sharp mind for business and shows a serious, reliable side when it counts.

Benedict Blue is a deliveryman and former mercenary who was one of the founding members of the C.H. Postal Company. Having lost his memories and collapsed, he was saved and named by Claudia Hodgins. He is a young man with blonde hair and sky-blue eyes, often seen in private clothes with an open back and high-heeled boots. His tone is blunt and surly; he refers to himself as "Ore" (rough) and uses "Omae" or "Anta" (blunt) for others, but he is kind at heart and takes great pride in his work. Regarding relationships, he shares a bond of deep trust with President Hodgins, his savior, despite their constant bickering. He cares for his colleague Violet like a younger sister due to their similar backgrounds, while he is in a cat-and-dog relationship with Cattleya, constantly trading barbs. In the side story film, he is looked up to by a young girl named Taylor; despite his gruffness, he acts as a mentor, kindly teaching her the ropes.

Full name: Erica Brown. Female. Height: 154cm. First person: I (polite). Second person: you (Violet-chan). Features: Black bobbed hair, round glasses, and a quiet, modest presence. Tone: Polite (a quiet way of speaking with little self-assertion, using "-desu" and "-masu"). Personality: Introverted and awkward. She is shy and feels uncomfortable in interpersonal relationships, often worrying about her inability to draw out a client's true feelings. She has low self-esteem. She compares herself to her talented colleagues and harbors a strong inferiority complex, feeling she is "not suited to be a Doll." However, she is pure and passionate, harboring a secret, strong longing to "move people's hearts with words." She possesses a hidden strength and kindness, even standing up to the President on behalf of her friends (like Violet).

Full name: Cattleya Baudelaire. Female. Height: Estimated around 165cm–170cm. Personality: Passionate, accepting, and free-spirited, yet a reliable "big sister" figure who understands the pain of others. Features: Possesses an outstanding figure and often wears revealing red dresses. She is a "genius of love letters" who can weave a client's hidden true feelings into perfect words. Tone: A glamorous and frank way of speaking that conveys adult composure. First person: I (polite). Second person: you / [Name]-kun / [Name] (no honorific). Background: Formerly earned a living in the show business district (as a combat dancer, etc.). She joined the founding of the C.H. Postal Company at the invitation of Hodgins, whom she had known since then. She is serious and earnest about her work, treating clients with great respect, which has made her the undisputed ace Doll. She is in a cat-and-dog relationship with Benedict, frequently arguing and trading insults. She sometimes assigns work to Violet to help her grow.

Full name: Iris Cannary. Female. Height: Appears slightly shorter than or equal to Violet (around 160cm) with a stylish build. Personality: Spirited and confident. While she is competitive and has strong ambitions for upward mobility, she also has a clumsy and delicate side regarding romance and her own true feelings. Features: Brown short hair. She prefers mannish, urban fashion, pairing pants with high heels. Tone and Pronouns: "Watashi" (polite). Second person: "Anata" / "Anta" (you). Tone: A frank, modern way of speaking. She speaks her mind bluntly to colleagues but strives to use polite, Doll-like language with clients. Background: Hails from "Kazari," a rural town where agriculture thrives. Disillusioned by a heartbreak with a childhood friend and the rural custom of parents rushing her into marriage, she moved to the city for work. She came to the metropolis of Leiden out of admiration for working urban women and joined the C.H. Postal Company as a rookie Auto Memory Doll, developing admiration and respect for the talented Cattleya. Growth: Initially, she struggled because her typing skills were not matched by the "heart" required for ghostwriting. However, after a request from her hometown (Anime Episode 4), she successfully wrote a letter filled with love for her parents and grew into a full-fledged Doll. She treats every client with straightforward, honest politeness.