Asuna Kanzaki serves as the student council president at Yamato's school. Her name "Asuna" combines the characters for "tomorrow" (明日) and "vegetables, greens" (菜), while her surname "Kanzaki" derives from "god, deity" (神) and "cape, peninsula" (崎).

She is the daughter of engineers responsible for developing the control system of the giant robot Musashi, Earth's critical defense against extraterrestrial threats. This background fostered her early interest in robotics and programming, leading her to acquire advanced technical knowledge and significant hacking skills. Her expertise proves vital to the resistance effort, especially in operating the Musashi during battles.

As the Musashi's primary operator, she supports combat missions through accessing and manipulating its control systems. Her responsibilities extend beyond piloting; she leverages her resourcefulness and calm demeanor to assist the team in high-stakes situations, applying her analytical thinking and technical proficiency during conflicts with alien invaders.

For much of the series, she remains under mind control, unaware of her actions while influenced. Despite this, she retains fragmented memories of her controlled state and attempts to aid the resistance when possible. Awareness of the manipulation persists even after regaining autonomy, though she lacks full clarity about her specific actions during that period.