One of Neo-Venezia's Three Water Fairies, known by the title "Siren" 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.