Nozomi Watase is a teenage maid with a slim build, standing 156 cm tall and weighing 40–46 kg, her physique accentuated by proportions of 86-54-88 cm (C cup). Her striking appearance features long, straight black hair with spiky bangs and side strands, black eyes, and a pale complexion, though some adaptations depict her with brown hair and grey eyes. She dons a traditional maid ensemble—a dress, headdress, choker, ribbons, and garter belt stockings—emphasizing her role within the Nakakouji estate.

An orphan employed in domestic service, Nozomi serves Ayano Nakakouji with unwavering dedication, performing chores like cleaning, cooking, and knitting. Her cheerful, kind-hearted nature and naive honesty contrast with undercurrents of jealousy and submissiveness, particularly in her readiness to endure rigorous training to better serve as her mistress’s companion. This passive compliance extends to tolerating teasing or manipulation, reflecting a self-sacrificial loyalty evident in her interactions with figures like Imada.

Religiously devout and refined, Nozomi exhibits "deredere" emotional transparency, openly expressing affection. Her narrative revolves around navigating environments steeped in desire and shifting power dynamics, though her story prioritizes immediate situational challenges over defined long-term growth. Across visual novels and adaptations, her core traits and occupation remain consistent, with minor variations in age (19–21) and design elements, reinforcing her role as a steadfast yet complex figure within domestic and interpersonal tensions.