Alexandria Harris, Child of the Grigori
Alexandria Harris, played by Ryan Beall, is a two-hundred-year-old Child of the Grigori, and part-time computer repair technician. What's more her mother, Aria, was a Grigori of Purity.
Born in late 18th century, Alexandria's human father was slain when the family was ambushed by Undead. Nursing a deep and abiding hatred of all things unliving, Alexandria and her Mother engaged on a century long war against the Walking Dead, until she , too, fell while battling the Walking Dead in California. While roaming the continent, she found love and had a son, but after her husband died, she gave him up for adoption. Eventually, her Destiny (or her Fate) brought her to Austin, as one of the biggest Tethers on the Continent, the Hill County Catacombs, sat nearby.
Essentially, she's a type of Highlander-Style immortal, though the reasons behind it may differ. It's possible that there is no "Prize" at all, and the whole "Quickening" thing was a plot by Uriel to make the Children of his Grigori self-exterminating. The vast majority of Austin's Celestials probably think she's a Soldier or a Mundane, with the exceptions of her best friend Daphne; Her Significant Other Tomas, the Unfriendly Neighborhood Malakite Drake, and former part-time tattletale Esther. The Archangel Dominic also apparently knows, and why he hasn't revealed her or had her slain is a secret only he knows.