Spartan-III hailing from the planet Actium, in the Erem system. Lost both her parents in the attack; forgets her own name and takes on the name Helios, to subsequently become Helios-G249 of Gamma Company. Younger sister to Ares-A205 and Hunter-B170; only the latter knows she exists, as of 2558. Rendered nonspeaking after a one-on-one close-quarters fight with a Sangheili.