Nyx Vantage is a Fleet Admiral in the Earth Republic Star Navy, and former XO and CO of the ERS Valkyrie, serving as XO from 2138 until 2142, and as CO from 2142 until he was promoted to Rear Admiral in 2148. He served for many years as a Tactical Admiral. As a young officer, he served aboard the ERS Daimajin.
Nyx Vantage married a young Med Tech, Ekaterine, during his time on the Valkyrie; she subsequently left the service after they married and entered Mat-Dev, where she rose through the rank and became a highly regarded official. They have two children: their sons Geras (born 2127) and Oizys (born 2130). Oizys entered and graduated from Star Navy Academy's Cadet Program at Annapolis, and became CO of the ERS Gondul, to his father's great pride, and married fellow officer Kana Honbashi in 2157, daughter of Admiral Star Honbashi (after much parental infighting).
Nyx has one sister, Eris, who has a son (Murphy) and a daughter; despite her brother's pressure, she refused to assume the family's bizarre Greek naming conventions.