Mena Quinone is a recurring character in the series, forming one half of the renowned "Great Mercenary Sisters" alongside her younger sister Phyllo Quinone. As the primary mage of the duo, she specializes exclusively in water-based magic during combat. Her appearance features shoulder-length blonde hair and blue eyes, and despite being the elder sibling, she stands notably shorter than Phyllo.

Mena exhibits a consistently bright and approachable personality, contrasting Phyllo's reserved nature, and engages others with friendly, conversational ease.

Phyllo serves as her sister, professional partner, student, and implicit rival for Lloyd Belladonna's affections. Mena views Lloyd as both a student and a younger brother figure while simultaneously harboring romantic feelings for him, creating a dynamic where he functions as both protege and love interest in her interactions.