“Now that I’m a Devil, I can live the life I’ve always wanted. That includes creating life inside me.”

Xenovia Quarta is one of the many female protagonists of High School DxD. She is a third-year high school student at Kuoh Academy in Class 3-B and is a natural-born Holy Sword user who wields the Durandal. After learning the truth of God's death in the war, Xenovia was excommunicated from the Church and decided to join the Occult Research Club as Rias' second Knight, alongside Yuuto.

Xenovia is a beautiful young woman with chin-length, blue hair with a dyed green fringe on the right side and yellow eyes. Xenovia's height 166 cm (5 feet 5 ).

Her battle attire is her Church battle suit, which consists of a black, skin-tight, short sleeve leotard with pauldrons, matching fingerless gloves that extend to her biceps, and thigh-high boots, all of which are adorned with straps. This attire is worn under a white hooded cloak with gold and blue accents. She also wears a crucifix around her neck, which was later removed after becoming a Devil.

Upon transferring to Kuoh Academy and joining the Occult Research Club, she wears the Kuoh Academy girls' uniform but without the cape.

When Xenovia was first introduced, she was shown to have a calm, quiet, and serious demeanor, putting her mission first and only speaking when necessary. She was also very cold, bordering on heartless, as she called Asia a witch for becoming a Devil (even though she became one unwillingly so she could be with Issei) and even went so far as to try and kill her. She later threatened to do the same to Kiba when he was technically a Stray. After being reborn as a Devil, however, she gains a very close relationship with Asia, being touched by her kindness and apologizes for calling her a witch when they first met.

In battle, Xenovia appears to be a bit arrogant, stubborn, and rarely uses her head in attempting to overwhelm her opponents with pure power and strength instead of being subtle or using skills. According to Issei, her fighting style is comparable to that of a Rook despite being a Knight, referring to her as a "Power idiot".