Ezra Vieil serves on the bridge crew of the battleship Nirvana as an operator, with her work primarily focusing on communications. She is a young woman with brown eyes and waist-length brown hair, often seen wearing a hairbow and tie. Her personality is defined by a kind and cheerful disposition, and she consistently demonstrates an ability to uplift those around her through her gentle nature.

One of the defining aspects of Ezra's role in the story is her decision to become a Fama, a woman who chooses to bear a child. Consequently, she is pregnant throughout much of the series, and the symptoms and changes she experiences are a source of mystery and curiosity to the male crew members who have no prior knowledge of such matters. Her personal motivations are closely tied to her pregnancy, as she strives to care for her baby and earn the pride of her "Ohma," a term for her partner.

Ezra's key relationships are deeply connected to her experience as an expectant mother. While the mystery of her condition puzzles the men, the crew ultimately rallies to support her. Her inherent kindness is repaid when they all assist her through the process of giving birth, despite the difficult circumstances in which they find themselves. Throughout her journey, she faces the challenges of motherhood but continues to do her best to nurture her child. A notable aspect of her role is based on her physical condition, and she does not have any special combat or technological abilities that are highlighted, as her contributions are rooted in her communications duties and her personal story of motherhood aboard the ship.