Eriko Henmi is a supporting female character within the world of Alice Gear Aegis Expansion. She is a researcher who holds multiple significant positions, working under the umbrella of the Onaraya General Technology Development Office and simultaneously serving in the Advanced Science Development Office, the Empirical Quantum Applications Office, and as the manager of the General Hot Water Supply Room. Additionally, she belongs to a special research laboratory.

In terms of personality, Eriko is portrayed as a mature adult woman who typically maintains a gentle and constant smile, presenting a warm and approachable demeanor. Her motivations are rooted in a genuine and altruistic desire to pursue the full potential of the Alice Gear technology. She is driven by the wish to utilize this powerful equipment to contribute to world peace and societal development, rather than for personal or military gain alone.

Within the narrative structure, she functions as a member of the research and support staff, contributing to the story's focus on the technological and developmental aspects of the Alice Gear. Her role is primarily as a supporting figure, facilitating the main characters' efforts through her scientific expertise.

The search results do not provide specific details regarding her key relationships with other main characters, her personal development over the course of the series, or an exhaustive list of her notable combat or technical abilities beyond her broad research focus.