Aiko Kurosawa serves as a Psychological Counselor at the Special Ward known as Sanctuary, a facility under the jurisdiction of the Ministry of Economy, Trade and Industry Environment Bureau. She is a woman who appears to be in her thirties, with a curvy build, light brown eyes, and long, straight black hair featuring bangs cut high across her forehead. Her typical attire consists of a white lab coat worn over a blue dress, an image she softens with magenta lipstick and eyeshadow, complemented by a billowy scarf tied in a half-bow at her neck.

On the surface, Kurosawa pretends to be genuinely interested in the progress and well-being of the latent criminals undergoing treatment at Sanctuary. However, this facade masks a deeply judgmental and cruel personality. Her true nature becomes evident in her interactions with others, particularly when she detains the inspector Yayoi Kunizuka. In this situation, Kurosawa gloats openly, speculating on how long Kunizuka will be able to resist screaming under torture, revealing a sadistic enjoyment of the suffering of those under her care. Her role within the story is that of an antagonist in the first case of the Sinners of the System film series, representing the corrupt and inhumane side of the institutions meant to manage society's criminals. A notable but subtle detail of her appearance is a heart tattoo, which she typically keeps hidden beneath her scarf.