Anya Dostoyevskaya is a Single undine affiliated with Orange Planet, training under Alice Carroll. She practices gondola navigation and tour guidance alongside peers Azusa B. McLaren from Himeya Company and Ai Aino from Aria Company.

Her personality blends calmness with spontaneity, occasionally adopting a literary tone that sparks unpredictable remarks—like declaring "From Siberia!" during first meetings—revealing a whimsical streak. Though generally gentle, she displays directness when emphasizing Aria Company’s significance.

Within Avvenire’s narrative, Anya first encounters Ai and Azusa during their joint pursuit of the elusive Cait Sith. Though unsuccessful, this search forges a friendship Ai later calls miraculous. Anya continues regular practice sessions with Azusa and Ai, forming the junior trio mirroring the senior undines.

She learns by observing senior undines’ dynamics. During events like Acqua Alta, she collaborates with Ai and Azusa to organize mentor gatherings, facilitating reunions that align with meaningful moments such as Athena Glory’s musical performances. These efforts highlight her role in sustaining bonds among undines across companies.

Interactions show professional respect for her mentor Alice. Anya’s spontaneous tendencies persist in later activities, like trailing senior undines during city explorations. The narrative frames her within Neo-Venezia’s theme of miracles, where her unpredictability aligns with the city’s capacity for unexpected, meaningful connections.

Her evolution maintains core traits while deepening integration into Neo-Venezia’s undine community through peer relationships and professional dedication.