Dr. Ashimori is a human woman who serves as the supervisor to Setoro, the individual seen observing the Time of Eve cafe. She is characterized as an influential person with access to protected information and is explicitly noted as not being a member of the Ethics Committee, the primary body governing human-android relations. Her own motives for assigning Setoro to investigate the cafe remain unclear throughout the narrative. A copy of a book titled Android Promotion Committee can be seen on her desk, which is interpreted as a potential counter-force to the Ethics Committee, and it is suggested that this is the organization to which both she and Setoro belong. Dr. Ashimori possesses classified knowledge of a critical event from a decade prior to the story, in which a young girl who later becomes known as Nagi was harmed, an incident subtly linked to the Ethics Committee, though her specific involvement remains undefined.

In terms of her actions and personality, Dr. Ashimori demonstrates a ruthless practicality and a willingness to employ force against artificial beings, as she is seen bashing an android with a pipe. She also makes personal visits to the Sakisaka family home and engages in arguments with Shiotsuki, who is Nagi’s guardian. A post-credits scene depicts her arguing with Shiotsuki in the presence of a younger Nagi, though the exact nature of their relationship is not definitively established. Her personality is described as practical and logical, with a strong attention to detail and a tendency to adhere to rules and established procedures. She is highly responsible and reliable in her professional capacity, but this can manifest as a strict or inflexible demeanor, particularly when rules are being enforced or unfamiliar situations arise. She also displays a degree of emotional detachment and a preference for working alone or remaining at a distance from social interactions.

Dr. Ashimori's role in the story is that of a background orchestrator. She is the authority figure who tasks Setoro with his surveillance mission, and her awareness of past events, including Nagi’s history, marks her as an influential player in the wider societal conflicts between humans and androids. Her relationship with Setoro is primarily professional, with her acting as his superior and receiving his reports on the cafe. Her confrontations with Shiotsuki establish her as a direct counterpoint to his philosophy and efforts to create a safe space for androids. Throughout the series, her ultimate goals stay largely enigmatic, and her personal history and deeper background remain unexplored in official sources.