Luna, a noble-born Ocean Sprite and Sprite Mage, holds the title of princess within Marina Castle. Her striking features include long, flowing aqua-blue hair and a white dress paired with a matching bandana, complemented by the Golden Key pendant resting against her neck. In her true mermaid-like form, she radiates an ethereal beauty, her presence often heralding critical interventions—like repeatedly rescuing Pinon from drowning. Fleeing Marina Castle after clashing with her mother Seline, Luna shelters on Popolocrois beach, her exile born from tensions between her identity and societal pressures, including fears of xenophobia toward outsiders. Seline’s eventual passing thrusts Luna into leadership as the Ocean Sprites’ new ruler.

Haunted by insecurity over her true form’s perceived strangeness, Luna’s journey parallels Pinon’s own struggles with his hybrid heritage, weaving shared narratives of self-acceptance. She gradually cultivates the bravery to claim her identity and duties, standing alongside Pinon, Marco, and Papuu to battle a creeping darkness endangering their world. Later quests see her pursuing the Lunar Drop, an artifact able to reverse petrification wrought by ancient malevolence, directly opposing forces seeking annihilation. Through these trials, Luna shifts from reluctant fugitive to steadfast protector of Popolocrois, her collaborations with allies exemplifying unity and tenacity, cementing her evolution into a decisive leader.