Marlya Noel is a central protagonist of the anime Fairy Gone. She is a new recruit to the Illegal Fairy Regulatory Agency known as Dorothea, an organization that investigates and suppresses crimes involving fairies. Marlya is a unique individual who possesses the ability to control fairies without undergoing the standard fairy organ implant surgery that most fairy soldiers require. She also has the rare natural ability to see fairy primordials without the aid of special equipment, a trait that originates from her homeland of Suna.

Marlya's background is marked by tragedy. During the War of Unification, her village was burned down, leaving her and her childhood friend Veronica as the sole survivors. This traumatic event shapes her entire journey. She originally joined the Biaklay Mafia family in order to gather resources and information in her search for Veronica. Later, she becomes a member of Dorothea, where she is partnered with the veteran fairy soldier Free Underbar. Her primary motivation throughout the story is to locate and reconnect with Veronica, who has become an illegal fairy soldier involved with an organization seeking a dangerous artifact known as the Black Fairy Tome.

In terms of personality, Marlya is determined and resilient, driven by her past loss and her strong desire to find her friend. She carries a hunting rifle and is capable in combat, though her abilities with fairies set her apart as a special operative. Her role in the story involves navigating the postwar instability of the continent of Eastald, working alongside Dorothea to pursue rogue fairy users and criminal elements while her personal quest remains at the heart of her actions.

Key relationships include her childhood friend Veronica Thorn, whose disappearance and transformation into an antagonist drive Marlya's quest. Her partnership with Free Underbar becomes a central dynamic, as the two work together regularly on missions. Marlya also interacts with various other members of Dorothea and encounters figures from the mafia and other factions involved in the struggle over the Black Fairy Tome.

Over the course of the series, Marlya develops from a newcomer seeking answers into a more confident and capable operative. Her unique fairy-using ability grows in understanding and application, and her pursuit of Veronica forces her to confront difficult truths about the war, the nature of fairies, and her own past. Her journey is one of seeking closure and grappling with the consequences of a world still scarred by conflict.