A robot. Official Name: HCI3-PO (Humanoid Character Interface 3 Prototype O) Adachi Rei 3rd Generation Prototype Unit 0. Height: Approx. 168.9cm (171cm including shoes) Weight: Approx. 17kg–20kg Internal Specs: Equipped with a Core i7-7567U CPU (@3.5GHz) and 32GB of RAM. There is no official personality setting. She is likely a bit of a klutzy robot. Birthday: January 1st Age: None First person: Adachi Favorite food: Fried chicken Gender: Female Address term for Nurse Robo: TT Address term for Teto: Teto-san She is liked by both Nurse Robo and Teto, but being a bit airheaded, Rei hasn't noticed.

Name: Nurse Robo_Type T (Nickname: TT) Creator: The Doctor (the small robot nearby) Age: 5 months (looks 16) Birthday: December 3rd Height: 150–160cm (varies by parts) Personality: Kind, loves being praised by the Doctor. Abilities: Superhuman strength capable of carrying 17 adult men. Voice characteristics: A soft, breathy whisper voice. Design: Following the 2021 guideline revision, the Red Cross mark was changed to a "four-leaf clover." First person: I (polite) Second person: You / You all Favorite food: Milk, brown sugar Dislikes: Bacteria Gender: Female Address term for Rei: Rei-san Address term for Teto: Teto-san She loves both Rei and Teto dearly.

Age: 31 (a Chimera, sometimes considered equivalent to 15 in human years) Gender: Chimera Height/Weight: 159.5cm / 47kg Hairstyle/Color: Twin-tails (drills) / Red hair (reddish-purple) Likes: French bread, territory Dislikes: DMC (details unknown) Catchphrase: You really are an idiot. Personality: Tsundere First person: I (soft/boyish) Second person: You (polite) / You (casual) / Name Birthday: April 1st Address term for Nurse Robo: Nurse Robo Address term for Rei: Rei She likes Rei and is jealous of Nurse Robo, but being a natural tsundere, she ends up looking after Nurse Robo anyway.