Fay is a young woman of slender build, standing 5'6" (168 cm), with striking violet hair and vivid green eyes. Her wardrobe leans toward bold choices, typically featuring bright yellow hot pants and a matching cropped top. A cigarette often rests between her fingers, accentuating her self-assured, assertive presence.

Born August 14, 1994, she is chronologically 77 but retains the physical vitality of a 23-year-old after 54 years in cryogenic stasis following a space shuttle disaster. The accident erased her memories, and subsequent destruction of the Moon during the Gate incident obliterated all records of her past, leaving only her first name intact.

Initially crossing paths with Spike Spiegel and Jet Black as a debt-ridden fugitive, she joins the Bebop crew to pursue bounty hunting as a means of survival. Her sharp resourcefulness, combat expertise, and piloting prowess quickly cement her role within the team. Though fiercely independent, she navigates evolving bonds with her crewmates while grappling with fragmented recollections of her pre-freeze life. Skilled in firearms and adapting to crises, she balances calculated detachment with moments of vulnerability, her unresolved history fueling both resilience and quiet introspection.