Tethys is a playable character in Fire Emblem: The Sacred Stones. She is another member of Gerik's Mercenaries, and the older sister of Ewan. Tethys is a beautiful, charming dancer, and also is a native of Jehanna. She and Ewan were both abandoned by their parents when they were young. After living a sad and hard life on the streets, Tethys began dancing to make money for both of them, and with time, she became famous for her beauty and skill. In a support conversation with Marisa, it is revealed she is in love with Gerik as well, and jokes about making a competition with Marisa to see who can gain Gerik's love. Other supports reveal that she's very observant and has a sharp eye for detail; she deduces at mere sight that Marisa is right-handed and not left-handed like she says, and she also tells Gerik that she taught herself how to dance after memorising a famous dancer's moves and practicing non-stop. She also has a healthy appreciation of aesthetics and beauty, as she wants Artur to tell her the secret to his beauty.