Anya Dostoyevskaya is a trainee undine with Orange Planet, holding the journeyman rank of Single. She trains directly under mentor Alice Carroll. She regularly practices alongside fellow apprentices Azusa B. McLaren from Himeya Company and Ai Aino from Aria Company, forming a peer group across Neo-Venezia’s three major water-guide corporations. Her personality blends a calm, gentle demeanor with spontaneity, and she occasionally employs literary or formal speech patterns. Noticing growing distance between her mentor Alice and another senior Orange Planet undine, Athena Glory, she perceives this as an issue requiring intervention and proactively collaborates with Ai and Azusa to facilitate a reunion. Later, during winter training exercises, she participates with Ai and Azusa, encounters unusual behavior from Akira E. Ferrari, and visits the Undine Museum, where they meet Asuka, a legendary figure from Himeya Company. When Aika S. Granzchesta expresses reluctance about inheriting a preserved gondola, Anya observes her peers and later joins in seeking Akari Mizunashi’s help to organize a group gondola ride with Aika, addressing concerns about tradition and legacy. Throughout, her role is primarily supportive, reinforcing camaraderie among the younger generation of undines as they navigate respecting established traditions while forging new paths.