“

Although my body is dead, I am still here with you. I am right beside you. —Febronia to Luis Virgil

”

Febronia (a.k.a. Feb) was a Realian owned by the Uzuki family and Shion's nanny who pratically raised her. She is a special prototype Realian that has human organs as well as synthetic organs and can survive several hours without her organs intact; being half-human makes her a very valuable prototype. Feb is no longer "alive", having been killed at the church of Miltia that Shion frequently attended. Febronia is also related to the past of former Lieutenant and current Testament Virgil. When she first encountered Virgil, he had been near death after being attacked by a group of Combat Realians which were ordered to attack Federation personnel. As an act of selflessness, Feb gave up part of her organs to help keep Virgil alive. After recovering herself, Feb treated his injuries and also provided food and shelter for him.

During the Miltian conflict, her church was attacked by a rogue group of Combat Realians that young Shion had been trying to escape from. Feb bravely confronted the attackers and was savagely beaten in an attempt to serve as a distraction while Virgil and Shion were fleeing for safety. Feb was finally killed in front of both Virgil and Shion after being stabbed by one of the rogue Realians. Her last words being for the two to "run" right before the Realians began to consume her flesh. After her death, Virgil was distraught and began to attack the Realians to carry her body to safety. This event may have been a significant contributor to Virgil's DME addiction as well as his racism towards Realians. Her death also haunted Shion for years.

Feb has two sisters, Cecily and Cathe, who were part of a machine keeping the Original Zohar in power deep within the walls of Labyrinthos on Old Miltia.

Feb plays an important role in allowing Shion to confront her haunted past in Episode I. In Episode II, she lures Shion to Old Miltia in order to "save" Cecily and Cathe. Her role here was key to the destruction of the Patriach; without her, Shion and her allies would not have reached Miltia, and ultimately, Proto Omega would have been unleashed on the galaxy.

Although she is an important character in Episodes I and II, Febronia is absent from the TV Asahi animated adaptation of Episode I, Xenosaga: The Animation, except for a very short cameo at Virgil's death.