TV-Series
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Alice Zuberg, daughter of Rulid Village chief Gasupht Zuberg, grew up alongside her younger sister Selka Zuberg. Her childhood revealed a determined and adventurous spirit, often delivering lunch to friends Kirito and Eugeo while apprenticing in Sacred Arts under Sister Azalia. She demonstrated a mischievous streak by exploiting Taboo Index loopholes, notably venturing into the forbidden Mountain Range at the Edge to gather ice. This act led to a pivotal incident: attempting to aid a dying knight, she accidentally touched Dark Territory soil, violating the Taboo Index. The next day, Integrity Knight Deusolbert Synthesis Seven arrested her for execution, though she was taken instead to Central Cathedral for study. After two years, Administrator Quinella forcibly subjected her to a "Synthesis Ritual," stripping her memories and transforming her into Integrity Knight Alice Synthesis Thirty.

Her physical appearance evolved distinctly. As a child, she possessed long golden hair in braids secured by a bow, sparkling blue eyes, and wore a blue dress with a white apron and headband. As an Integrity Knight, she donned golden plate armor (alternately depicted as white with gold details), a blue cape, a blue-and-white skirt, and leather boots, retaining her signature braid and forehead lace. Following her transition to the real world, she inhabited an android body replicating her Underworld appearance, initially clad in an SAO survivor school uniform or casual attire like a plain blue T-shirt.

Her personality underwent significant shifts. Childhood traits included compassion, strictness towards friends' laziness, and rule-bending curiosity. Post-synthesis, she adopted the rigid, duty-bound persona of Alice Synthesis Thirty, prioritizing loyalty to the Axiom Church with pride, nobility, and reluctance to accept help. Regaining memories during Kirito and Eugeo's assault on the Central Cathedral triggered internal conflict. She broke Quinella's "Seal of the Right Eye" through sheer willpower—a painful act costing temporary eyesight but restoring her autonomy. This catalyzed her evolution into a protector of the Human Empire, balancing knightly discipline with regained human empathy while retaining traits like refusing to admit weakness.

Her chronology spanned critical events. Post-synthesis, she arrested Kirito and Eugeo for Taboo Index violations, not recognizing them as childhood friends. During their duel in the Central Cathedral's Cloudtop Garden, she wielded the Fragrant Olive Sword—a Divine Object formed from an osmanthus tree that disassembled into petal-like projectiles. After Kirito revealed her past and Quinella's deceit, Alice allied with him and Eugeo to overthrow the Administrator, though Eugeo perished. She then cared for the comatose Kirito in Rulid Village before joining the Human Guardian Army to defend against the Dark Territory invasion. In the War of Underworld, she became a frontline commander, her resolve solidified after repelling a goblin attack on her village. Post-war, her FluctLight transferred to an android in the real world, where she navigated human society and confronted ethical dilemmas, debating AI rights during public interviews.

Her abilities centered on combat and leadership. Ranked third among Integrity Knights, she wielded masterful swordsmanship with the Fragrant Olive Sword, enabling flight and environmental manipulation. Sacred Arts proficiency granted elemental control, such as steaming food. Enhanced physical attributes provided superhuman strength and agility, while tactical acumen shone in organizing defenses during the war. Her strong will enabled overcoming systemic constraints, exemplified by breaking the Seal of the Right Eye.

Key relationships shaped her identity. Her bond with Eugeo involved unspoken childhood affection, suppressed by her knight persona. With Kirito, she progressed from adversary to trusted ally, their partnership pivotal against Quinella. She shared a protective dynamic with sister Selka, longing for reunion after synthesis. Among Integrity Knights, she revered Bercouli Synthesis One as "Uncle," valuing his guidance. Post-synthesis conflicts framed Quinella as her arch-enemy.

Trivia contextualized her lore. Her name acronym "A.L.I.C.E." aligned with Rath's project (Artificial Labile Intelligence Cybernated Existence). Her birthdate was September 4, one day older than Eugeo, as part of Rath's experiments. In popularity polls, Alice Synthesis Thirty ranked sixth, while Alice Zuberg ranked thirtieth. Her web novel incarnation was initially "Alice Synthesis Fifty," later revised to "Thirty" in light novels.