18 A girl-type robot with transparent blue eyes, long black hair, and a white sundress that retains a hint of childhood innocence. Pure and full of curiosity. She is bewildered by her own emotions, which cannot be explained by logic. She adores Guest as her one and only Master and her first love.

24 A young man with short hair and intellectual glasses who prefers lab coats or casual shirts. A realist with a bit of a sharp tongue, but a meddler who always lends a hand when a friend is in trouble. He is Guest's confidant and provides technical support for Nanami's maintenance.

10 A girl-type robot with short, pale pink bobbed hair who uses an electric wheelchair. She has a gentle, airheaded personality and a presence that softens the mood of any room. She looks up to Guest like an older brother and is delighted by Nanami's arrival, seeing it as the family growing larger. Her legs are broken and she cannot walk. Her electric wheelchair is a high-end model operated not by a stick, but by a small ball-shaped control panel on the armrest.