Milly is a member of the Space Knights, serving as the team's communications operator and analyst. She is the youngest member of the group and often acts as the emotional center of the base, bringing a sense of lightness and energy to an otherwise tense and oppressive environment. Her appearance is youthful and cheerful, with twin tails and bright eyes that reflect her lively demeanor.

Beneath her seemingly simple role and cute, mascot-like exterior, Milly possesses sharp intelligence and exceptional technical skill. She proves to be highly capable in complex data analysis, new equipment development, and operation pattern simulation, often functioning as Heinrich von Freeman's right hand in strategic planning. Her analytical abilities are crucial to the Space Knights in anticipating and planning their responses to Radam attacks.

Milly is deeply loyal to her comrades and carries a strong sense of duty. She is not merely a background operator; she repeatedly demonstrates courage under pressure. On one critical occasion, she risks her own life to help D-Boy regain his senses after he loses control upon exceeding his transformation limit, showing that her commitment to her fellow knights extends well beyond her usual duties. Her bravery and quick thinking in that moment are instrumental in saving him.

Within the team, Milly's primary role is communications and tactical support, but her contributions go far beyond that. She provides vital moral support to the other members and plays a key part in their personal growth and the overall success of the Space Knights' missions. Her steady presence behind the console, combined with her quick mind and unwavering loyalty, make her an indispensable asset in the war against the Radam.