Stasia serves as a shrine maiden and attendant within a strictly female realm ruled by the Mamamega. She has lilac hair, blue eyes, and stands 1.71 meters tall. Her primary weapon is a harp capable of transforming into a bow, symbolizing her preference for peaceful solutions despite her combat readiness.

Initially approached by Lilith to become a guardian shrine maiden for the new Mamamega, Stasia declined, perceiving the role as ceremonial during peaceful times. Her perspective changed when Rurubell, a younger girl she mentors and protects, became involved. Stasia ultimately accepted the position primarily to ensure Rurubell's safety. Following her recruitment, she participated in the coronation ceremony and then joined the mission to rescue the kidnapped Lilith and retrieve the stolen Astrostar artifact after an attack by the antagonistic Yamimama faction.

In the sequel strategy game, she remains one of the four playable shrine maidens aligned with the Mamamega, alongside Lilith, Juliana, and Rurubell. Players can utilize her to recruit followers across the realm.