Fal-Ys Meigis, often referred to as Princess Fal, is the crown princess of the Meigis Kingdom. She is introduced when a knight-class criminal abducts her in the capital city, and she is rescued by the farmer Al Wayne, who defeats the kidnapper with overwhelming ease. The rescue leaves her deeply impressed and infatuated with Al, and it sets in motion her efforts to bring him into the service of the kingdom. Although she initially appears to be a damsel in distress, she quickly reveals herself to be a shrewd and capable figure who carefully evaluates Al's strength and works to secure it for her country's benefit. After Al defeats Romeo Vandead, one of the former demon lord's generals who had plotted to kill her and her father, she rewards him with a large tract of farmland, but the gift comes with conditions. Al must register as an adventurer and answer the kingdom's call when needed. Al accepts, only to discover that the field she granted him is a wasteland, a demonstration of her willingness to use persuasion and mild deception to achieve what she believes is best for Meigis.

As a member of the royal family, Fal is composed, self-controlled, and guided by a strong sense of duty. She seldom acts on impulse, and her decisions are shaped by what serves the kingdom and its people rather than by personal preference. Her upbringing as a princess is reflected in her measured manner and her tendency to consider how her actions will affect those around her. She is a dedicated leader who prioritizes the safety of her citizens, and she accepts the weight of political responsibility even when it means making personal sacrifices. This sense of obligation is most visible when she agrees to an arranged marriage with Prince Nedirus of the neighboring Antisburg nation for the sake of her country, a situation she endures despite her own wishes and one that later places her in danger when Nedirus's true intentions are exposed.

Fal's role in the story is that of the royal figure who draws Al away from his quiet farming life and into the larger conflicts facing the kingdom. She acts as the link between the protagonist and the political world, bringing the perspective of the ruling authorities into a narrative centered on an ordinary farmer. She also serves as one of the story's heroines, and her relationship with Al develops considerably over the course of the series. Her initial admiration for him grows into genuine romantic feelings, and she becomes protective and at times jealous when other women show interest in him. Her relationship with her father, King Meigis, is professional but warm, with both sharing a commitment to the kingdom's welfare. She also interacts closely with members of the adventurer's guild, including the receptionist Helen, with whom she shares a friendly rivalry over Al's attention.

Although she is not the story's central combatant, Fal is portrayed as a skilled fighter and a capable strategist. She is competent in battle and shows a strong understanding of politics, tactics, and the value of alliances, which makes her an effective representative of the crown. Her character arc sees her grow from a seemingly passive figure who needs to be rescued into a more active participant in protecting the kingdom. Through her growing reliance on Al, both as a powerful ally and as a trusted companion, she develops a more personal understanding of leadership and responsibility while remaining devoted to the welfare of her country throughout.