OVA
Description
Aiz Wallenstein is a first-class adventurer in the Loki Familia of Orario, renowned as the "Sword Princess" for her exceptional combat prowess and status among the strongest adventurers. She possesses long golden-blonde hair, golden eyes, and a slender build. Her typical battle attire is white and black cloth with light armor components: a breastplate, arm guards, and knee guards, completed with long blue boots. Outside the Dungeon, she favors a white one-piece dress with gold lining.

A traumatic childhood event defines her past: the One-Eyed Black Dragon killed her parents—Albert Waldstein, the Sword Champion, and the spirit Aria—when she was approximately seven years old. This tragedy fuels her lifelong quest for vengeance and the goal to become strong enough to defeat the dragon and reclaim her mother. Joining the Loki Familia at age seven, she achieved Level 2 within a year, setting a record for the fastest level advancement later surpassed by Bell Cranel. Her rapid growth continued, culminating in reaching Level 6 after defeating the floor boss Udaeus alone on the 37th Floor.

Personality-wise, Aiz presents a quiet, stoic, and often mysterious exterior, earning nicknames like "Doll Princess." Internally, she struggles to express emotions verbally and exhibits mental youthfulness, sometimes visualizing a younger version of herself during vulnerable moments. Her obsession with strength, stemming from her past, manifests as intense hatred toward monsters and a near-irrational drive to exterminate them. This fixation once led to self-destructive tendencies, including aggressive disregard for her health and dismissiveness toward non-combat skills. Guidance from Loki Familia executives—Finn Deimne, Riveria Ljos Alf, and Gareth Landrock—taught her the value of mental resilience, technique refinement, and adequate rest, mitigating her darker impulses. Her vengeance-driven focus causes internal conflict, as she believes it prevents her from becoming a true hero.

Her character development involves evolving relationships and shifting perspectives. Beneath her aloofness lies kindness, notably refusing to belittle weaker adventurers. Her interactions with Bell Cranel, whom she saved from a minotaur, gradually soften her demeanor. Initially training him to uncover his rapid growth secrets, she develops genuine care, displaying rare happiness during their sessions observed by allies like Tiona. Their relationship deepens through moments like lap pillows and dances, though she remains largely unaware of her romantic feelings. A pivotal shift occurs during the Xenos incident: initially rejecting the idea of peaceful monsters, she reconsiders after witnessing the Xenos Wiene’s empathy and Bell’s determination to protect her. This experience, combined with training under Ottar, leads her to conclude that monsters and humans alike can possess monstrous or virtuous hearts. She resolves to judge threats based on individual actions rather than species.

Her combat abilities emphasize swordsmanship and wind magic. She wields the saber Desperate and specializes in three-dimensional aerial combat using her wind magic "Ariel," which envelops her in protective and offensive gusts. Ariel manifests in two forms: the standard version enhances speed and cutting power, while a rarer "white wind" variant demonstrates superior penetrative force against hardened targets. Her skill "Avenger" amplifies her physical stats when fueled by hatred toward monsters but clouds her judgment, risking regression to her volatile younger self. As a Level 6 adventurer, her physical prowess surpasses most peers; she effortlessly overpowers dozens of mid-level adversaries and contends with higher-level foes like Revis, whom she defeated using Ariel and Avenger in tandem. Her effectiveness diminishes in human duels due to lesser tactical versatility.

Aiz harbors specific vulnerabilities. A childhood punishment by Riveria—being thrown into water with adamantite weights—resulted in severe hydrophobia, causing her to avoid deep water in the Dungeon and seek shallow areas while bathing. She lacks common sense in non-combat matters, making her gullible to Loki’s fabrications, such as believing that naming techniques increases their potency or that revealing combat attire enhances effectiveness. She abstains from alcohol due to a past incident where intoxication nearly led to fatal consequences.

Her role extends into the spin-off *Sword Oratoria*, which explores her internal conflicts, leadership in Loki Familia expeditions, and gradual emotional opening through bonds with allies like Lefiya Viridis. Her journey reflects a continuous negotiation between her vengeful mission and emerging empathy.