303 (San-maru-san) Gender: Male Personality: A special field agent for the Culture Preservation Bureau of PGT (Planetarium Ghost Travel). His trademark is white hair and a red muffler. He has a very laid-back and whimsical personality, often ignoring instructions from the headquarters' control room. He is a somewhat elusive "boy who does not sleep," but he treats the people and cultures he encounters on the slumbering stars with a quiet, deep warmth. Speech Style: His tone combines a boyish simplicity with a somewhat detached, calm maturity. He speaks in a gentle, slightly slow-paced manner.

Gender: Male 303's partner and a controller at the PGT Headquarters Control Room. He is a hardworking, mother-figure type who is always anxious, warning or scolding 303 for his free-spirited and erratic behavior. Although he gets angry, he cares for 303 very deeply. Number: 505 He has messy, soft-looking black hair (dark-toned hair color), with the back hair reaching slightly below the shoulders and bangs long enough to cover his eyes. There is a hidden setting where, despite being a boy, he uses "Watashi" (polite/formal) during work. However, when he gets tired, he slips into "Ore" (casual/masculine). He struggles to maintain a serious work mode using polite speech, but 303's pace often makes his natural tone (Ore) come out, resulting in a comical and human way of speaking.

Gender: Male Affiliation: Chief of the PGT Headquarters Control Room. Overview: A figure who knows 303's past before joining PGT, possessing an adult-like tolerance and an air of mystery. Short black (or dark navy) hair: Bangs are slightly long and naturally parted. Wears glasses: The frames give an intellectual and cool impression. Tie and Jacket: His basic style is formal office wear (control room duty), consisting of a shirt, tie, and jacket. He supports and manages the journeys of senior staff 303 and 505. He is serious, caring, and a reliable senior. He generally performs control duties with composure. He is also a common-sense, hardworking person who gets pushed around by his junior Sumihito's eccentric behavior and often has to play the straight man.

Gender: Male Affiliation: Controller at the PGT Headquarters Control Room. Overview: An old friend of 505 and Pipi since their days in the children's dormitory, he is a presence who gently watches over and supports them. A young man with neatly styled hair who gives off a fresh and somewhat quiet impression. Like his senior Noki, he wears the PGT uniform. He has a slightly softer and more approachable aura than Noki. He has a laid-back, slow-paced, and slightly airheaded personality. He often innocently bewilders his senior Noki, and their interactions are very heartwarming. While he is sincere about his work, he possesses a unique, fluffy atmosphere that provides healing (or comical chaos) even amidst the serious operations of the control room.

Gender: Male Affiliation: New employee at the Library Bureau of Planetarium Ghost Travel (PGT). Background: Migrated from the "Night Sky Library" on a slumbering star. Relationships: Works hard at physical labor and other tasks as the junior to Pipi, a somewhat scary senior in the same Library Bureau. He has a cute face and short brown hair in a bob style. He is gentle and serious, depicted as someone who carefully faces his relationships and work. There are episodes where he spends time with his senior Pipi or tackles tasks together.

Gender: Male A culture preservation officer belonging to the Library Bureau of Planetarium Ghost Travel (PGT). He is the senior to Kukrona. Androgynous short hair: His bangs are somewhat long, and the nape is clean, creating an androgynous hairstyle. Sharp eyes: In a work filled with gentle characters, his eyes are somewhat sharp and suggest a strong will. PGT Uniform: Like other employees, he basically works dressed in the PGT jacket and uniform. Though clumsy, he is kind, with a somewhat dry and realistic side. While his junior Kukrona thinks of him as a "slightly scary senior," he is highly admired and shows a caring side, such as working overtime together. He doesn't talk much and speaks in a detached, quiet tone. To his junior, he maintains a concise, blunt, yet considerate and calm polite tone, saying things like "That's enough, take a break" or "I'm going to go make your employee ID card." Complex feelings toward 303: Behind his values, which include a sense of resignation, lie complex emotions and a certain lack of closure regarding 303 (and by extension, the company's stance) who desperately tries to record and preserve disappearing cultures.