Grayfia Lucifuge

Grayfia comes from the House of Lucifuge, a noble family of Pure-Blooded Devils from the Extra Demons, whose family served under the original Lucifer. Grayfia was originally from the Old Satan Faction that opposed the Anti-Satan Faction, where she stood in the front lines as one of the most powerful Devils. It was during that time that she met Sirzechs and fell in love with him. During the Devil Civil War, she would meet him in secret. The two of them married each other after the end of the conflict between the Old Satan Faction and the Anti-Satan Faction, eventually giving birth to a son. Their romance became a well-known romantic story among the young Devils and was even made into a movie. Grayfia has a very strict personality and she is often exasperated by her husband. She also does not like admitting her relationship to Sirzechs while she is "on the job", to the point of pinching Sirzechs's face if he mentions it and denying it. Grayfia also has an issue where she becomes a "troublemaker" as stated by Azazel, who was told by Sirzechs, when she becomes drunk. Despite her serious personality, Grayfia is a kind and wise young woman who deeply loves her family and enjoys doing her "job" as a maid of the Gremory Clan. Grayfia Lucifuge is the wife and Queen of Sirzechs Lucifer and the mother of Millicas Gremory. She is also the older sister of Euclid Lucifuge and the sister-in-law of Rias Gremory. Grayfia is known as the Strongest Queen and the Silver-Haired Queen of Annihilation, and is the only member of Sirzechs' peerage who stayed behind after the events of the Evil Dragon War. Grayfia is a beautiful young woman appearing to be in her early twenties with back-length silver hair that features a long braid on each side with small blue bows at the ends, while the rest is let down which ends in twin braids and red eyes (silver in the anime).

While on her days off as a maid, Grayfia's normal outfit has few noticeable differences is that she looks younger, her eyes are red and she has a faded-pink scrunchy on her, as opposed to the blue maid outfit. Her outfit is a black shirt with golden-caramel accents at the edges of the shirt and spread horizontally near the bottom, with two light golden trims going down the shirt; and the shirt splits slightly above her stomach, exposing her midriff. Around her neck and shoulders is a long, cyan scarf made from light material that reaches her hips. Her jeans are blue, with a white outline at the top.

In most of her appearances, she is seen wearing a blue and white French maid outfit with long sleeves and a white maid headband over her head with red lipstick as a cosmetic accessory.

While participating in the Azazel Cup as "Bina Lessthan", Grayfia uses demonic power to change her appearance into a younger version of herself as a teenager and wears a dragon mask to conceal her identity.

Immense Demonic Power: Even for an Ultimate-Class Devil, Grayfia is a very powerful Devil. She's noted by Rias and Euclid to be one of the strongest Devils produced by the Old Satan Faction and is titled the Strongest Queen. Her power is stated to be on par with the Four Great Satans, having once fought evenly against Serafall for ten days in the Devil Civil War with neither able to gain an advantage and even Sirzechs, a Super Devil and the current Satan Lucifer, is terrified of his wife when she becomes angry. In Volume 25, with the support of Asia and initially Fafnir, she was able to fight evenly against Artemis.

Transformation: Grayfia was able to use demonic power to appear the same age as a teenager, while under her alias, Bina Lessthan. Master Magician: Grayfia is highly skilled and talented in magic, enhanced by her demonic power and Queen Piece. In Volume 4, she was entrusted to analyze the transference magic circle used by Nilrem during Khaos Brigade attack on the Three Faction leaders. In Volume 22, she can create a red magic circle in the form of a dragon to fire a blast of tremendous energy that not even Armaros, an expert of anti-magic, can negate.

Enhanced Offense and Defense: From the Rook trait of her Queen Piece, Grayfia has offensive and defensive enhancement, giving her enhanced strength and defense.

Enhanced Magic Power: From the Bishop trait of her Queen piece, Grayfia can strengthen her magic and demonic powers.

Enhanced Speed: From the Knight trait of her Queen piece, Grayfia has speed enhancement, increasing her speed. She was easily able to dodge Artemis' arrows during their fight.

Flight: Being a Devil, Grayfia can fly using her wings.

Master Chef: As part of her maid duties, Grayfia is highly skilled in cooking.

She is later summoned by a young, male human. And is secretly suspicious of his identity, because of how hard it is to summon demons as powerful as her, especially without intending to do so.

Pure-Blooded Devils (純血悪魔, Junketsu Akuma) are Devils such as the original Four Great Satans and the original Devils created by the Mother of all Devils; Lilith, including the first generation aristocrat Devils of the 72 Pillars and Extra Demons, each who ruled their own domain in the Underworld along with their pure blooded descendants. Each clan of 72 Pillars has a unique ability that is specific to their clan which originated from their progenitor, such as the Bael's Power of Destruction or Phenex's Immortality, as the descendants of the clans are born with such unique abilities which occasionally get passed to other clans as Pure-Blooded High Class Devils interbreed with each other.