One of Neo-Venezia's Three Water Fairies, known by the title "Siren" (天上の謳声, Tenjō no Utagoe?, lit. "Heavenly Voice") for her beautiful singing voice. She is Alice's mentor at Orange Planet. She is quiet most of the time and often appears to be an airhead who does not pay attention to her surroundings (in the anime, she is shown more than once forgetting to duck while rowing under a bridge), but she genuinely cares about Alice. Athena has a strange laugh that comes out sounding as though she is angry. She was a trainee undine with Alicia and Akira, and joined them in joint practice sessions much like Akari, Aika, and Alice do now. At the conclusion of the series, Athena semi-retires from being an undine in order to debut as an opera singer.
Character is error.