Quinella is the main antagonist of the first half of the Alicization Arc in Sword Art Online. She is the self-proclaimed Administrator and the actual ruler of the Human Empire in the Underworld, serving as the highest minister of the Axiom Church.

Born as the daughter of a powerful noble in Centoria, Quinella discovered and mastered Sacred Arts at a young age. She used this knowledge to gain power and eventually establish the Axiom Church, becoming its leader and the de facto ruler of the Human Empire. Over the centuries, she developed various methods to maintain her control and extend her lifespan, including merging with the Cardinal System.

Quinella's actions and desire for absolute control over the Underworld form a significant part of the conflict in the Alicization arc, as she opposes the protagonists Kirito, Eugeo, and Alice.

Personality and Appearance

Quinella is described as an extremely beautiful woman with long silver hair, including silver eyelashes and eyebrows. Her eyes are silver and seem to reflect the seven prismatic colors. She has a voluptuous figure and typically wears light, revealing clothing hemmed with silver threads.

A ruthless desire for power and control characterizes her personality. After merging with the Cardinal System, she focused on regulating and maintaining the status quo in the Underworld. Quinella is highly intelligent and manipulative, using her knowledge of Sacred Arts and the Underworld system to maintain her rule.

Powers and Abilities

As the Administrator of the Underworld, Quinella possesses numerous powerful abilities:

• Vast Knowledge of Sacred Arts: Quinella has unparalleled mastery over Sacred Arts, including secret high-level commands.
• System Control Authority: She has the highest level of authority within the Underworld system, allowing her to manipulate various aspects of the virtual world.
• Immortality: Quinella has halted her aging process and doesn't require food or drink to survive.
• Memory Manipulation: She can alter and control the memories of others through the Synthesis Ritual.
• Weapon Creation: Quinella can create powerful weapons using high-priority objects in her surroundings.
• Superhuman Physical Abilities: Her mastery of Sacred Arts grants her enhanced strength, speed, and durability.

Trivia

• Quinella created the Taboo Index to control the population of the Underworld.
• She established the Integrity Knights as her personal guard using memory manipulation.
• Quinella's consciousness is split between her main personality and a sub-process inherited from the Cardinal System.
• She discovered a way to increase her stats by killing living beings, which she kept secret from others.
• Quinella created the Immortal Wall to divide the Human Empire into four regions.
• Her final battle involved facing off against Kirito, Eugeo, and Alice at the top of the Central Cathedral.