Gaios and his sister Gelina are described as tall, speedy, and "absurdly beautiful". They serve the Porphyrian goddess, Necessity, and as such, dress plainly without any decoration. They are both very skilled athletes and received public honors for their victories during the Solstice Games.
Seraphina first knew Gaios as one of the "grotesques" that populated her mental garden. Called Nag, he and his twin, Nagini, would race each other over three sand dunes in Seraphina's mind. Eventually, Seraphina met their real-world counterparts when her travels brought her to Porphyry.
Although he cannot see every ityasaari's soul-light, he is able to see his sister's.