Xenovia is a striking young woman with chin-length blue hair, accented by a dyed green fringe on her right side, and brown eyes (which appear dark yellow in the anime’s second and third seasons). Her physique is athletic and well-defined, with measurements of 87-58-88 cm (34-23-35 in), a height of 166 cm (5 feet 5 inches), and a weight of 56 kg (123 lbs).

In battle, she wears her Church-issued combat suit, a sleek, black, skin-tight leotard with short sleeves, paired with pauldrons, long fingerless gloves reaching her biceps, and thigh-high boots—all featuring strap details. This suit is complemented by a white hooded cloak with gold and blue accents, and a crucifix pendant, which she stops wearing after becoming a Devil.

When she joins Issei’s peerage and participates in the Rating Games, Xenovia’s attire includes a red buttoned top with a white tie, red shorts, a black waist cape, and a purple cape draped over her left shoulder.

In her everyday life as a Kuoh Academy student and a member of the Occult Research Club, Xenovia adopts the standard girls’ school uniform, opting to forgo the cape.

Initially, Xenovia is introduced as a calm, quiet, and serious individual, intensely focused on her mission and generally speaking only when necessary. Her demeanor comes across as cold—even ruthless—as she initially judged Asia harshly for becoming a Devil, labeling her a “witch” despite Asia’s unwilling transformation, driven only by her desire to stay with Issei. At one point, Xenovia even attempted to kill Asia and later threatened Kiba, deeming him a Stray. However, after her own rebirth as a Devil, Xenovia develops a deep bond with Asia, touched by her kindness and ultimately apologizing for her earlier harshness.

In combat, Xenovia exhibits a bold, often stubborn approach, favoring sheer strength over strategy or subtlety. Issei notes that her fighting style aligns more with that of a Rook than a Knight, humorously dubbing her a “Power idiot” for her tendency to rely on brute force. Having been raised within the Church, Xenovia’s understanding of everyday life can be somewhat naïve, as seen when she once brought a box of condoms to school, viewing it as a practical preparation for her goal of producing strong offspring with Issei, whom she has chosen as her ideal mate.

As the series progresses, Xenovia’s feelings toward Issei deepen into genuine affection, admiring his willingness to protect his friends despite the risks. This budding romance brings out a more assertive side to her, especially in her often blunt but sincere attempts to win his affection, demonstrating her own comfort with her attraction and her unabashed, slightly mischievous side.

Though once strictly adherent to the Church, Xenovia’s beliefs prove flexible. She willingly accepts help from a Dragon, even if only to enjoy a free meal after Irina mistakenly spent their funds on a counterfeit painting of a Saint. Over time, her understanding of morality expands, becoming more compassionate and open-minded. She empathizes deeply with Masaomi’s tragic separation from Cleria, even shedding tears in the heat of battle, which contrasts with her typical combat-focused resolve. Her ability to hold onto her compassion amidst her warrior instincts marks her growth and layered personality.

From a young age, Xenovia dedicated herself to rigorous training and study, committed to serving God and her faith. She was raised under the mentorship of Griselda Quarta, who acted as both her sword master and legal guardian, preparing her to wield the Holy Sword Durandal. Eventually, Xenovia rose to the rank of exorcist, becoming an agent of the Catholic Church and partnering with Irina Shidou in her missions.

About three years before the series begins, Xenovia encountered a close call during a mission with Irina, where they were tasked with eliminating a stray vampire from the House of Manthar. Her long hair nearly compromised her safety during this encounter, leading her to cut it short to avoid similar risks in the future. She also added a green-dyed fringe for a touch of personal style.

Xenovia wielding her sword, Durandal, with determination.

Durandal (デュランダル, Dyurandaru)
Xenovia’s primary weapon, Durandal, is a uniquely shaped, single-edged blue broadsword with a golden edge. It is so attuned to its wielder that it responds to her will, releasing a powerful aura capable of significant destruction. Xenovia later discovers she can transfer this aura to other Holy Swords, as demonstrated when she channels Durandal’s Holy Aura into Ascalon.

• Durandal Birth: A combination technique between Xenovia and Yuuto, where she channels Durandal’s Holy Power into Yuuto, allowing him to create multiple Holy Demonic Swords imbued with Durandal’s energy.

• Durandal Cannon (デュランダル・キャノン, Dyurandaru Kyanon): Named by Issei, this technique involves Xenovia charging Ex-Durandal’s Holy Power and unleashing it in a devastating attack. The drawback is the need for a recharge after each use, which takes longer after the initial charge.

• Cross Crisis (クロス・クライシス, Kurosu Kuraishisu): Developed during a battle with Walburga, Xenovia wields Durandal and True Excalibur simultaneously to amplify their Holy Power. This technique produces a powerful cross-shaped attack capable of splitting apart foes, such as Walburga’s enhanced Yamata no Orochi.

Excalibur (エクスカリバー, Ekusukaribā)
Xenovia’s second weapon, True Excalibur, is forged from the merging of all seven Excalibur fragments into a single, complete blade, allowing her to wield its full power as the original legendary sword.

• Excalibur’s Scabbard (エクスカリバーの鞘, Ekusukaribā no Saya): The scabbard of Excalibur possesses Holy Power similar to a regular Holy Sword, providing Xenovia with near-immortality by healing her from even God-class inflicted wounds. Although it has its limits, it allowed her to endure attacks from Apollon, Chief God, even while trapped in a light-based cage.

Crimson Destruction Dragonar (真紅の破壊龍騎士クリムゾン・デストラクツョン・ドラグナー, Kurimuzon Desutorakushon Doragunā)
Also known as the Crimson Dragon Knight of Destruction, this variation of the Scale Mail is achieved when Issei’s Red Wyverns synchronize with Xenovia, creating a red armor that boosts her speed and strength significantly. With this armor, she becomes capable of massive terrain-altering attacks and has even outpaced Nero. While similar to Rias’ Crimson Extinct Dragonar, it is uncertain if Xenovia can use Boost, Transfer, and Penetrate.

Knight Piece (騎士の駒, Kishi no Koma)
Xenovia was reincarnated as a Devil using a Knight Piece, enhancing her speed beyond that of an average person. However, her power-oriented fighting style makes her slower compared to technique-focused Knights like Yuuto and Bennia.

Formerly Wielded Weapons

• Excalibur Destruction (破壊の聖剣エクスカリバー・デストラクション, Eksukaribā Desutorakushon): Xenovia’s initial weapon, Excalibur Destruction, could release devastating force, shattering anything in its path. She abandoned it upon becoming a Devil but later reclaimed and fused it with Durandal to create Ex-Durandal.

• Ascalon (アスカロン, Asukaron): Issei’s weapon, which Xenovia occasionally borrowed to channel Durandal’s aura. After acquiring Ex-Durandal, she no longer needs to borrow Ascalon.

• Ex-Durandal (エクスデュランダル, Ekusu-Dyurandaru): The upgraded version of Durandal, created by merging all six Excalibur fragments with Durandal. Ex-Durandal combines the powers of both Durandal and Excalibur, giving Xenovia the potential to rival even powerful opponents like Cao Cao. Though she initially only mastered Excalibur Ruler, Blessing, and Nightmare, by Volume 19, Xenovia fully embraces the powers of Durandal and Excalibur, resuming her dual-wielding style with mastery over both legendary swords.