Narcia begins as a young forest witch dwelling in Flornel Forest, charged with safeguarding the land and appeasing its resident sprites. Her first meeting with Prince Pietro on an early adventure sparks a bond that draws her into his subsequent journeys. Initially clad in a pink dress and distinctive two-pointed hat hiding her fairy antennae, her attire matures into a semi-purple and pink gown upon reaching fifteen years. Her background holds a vital secret: the Golden Key, a treasure gifted by her godmother Guilda. This artifact enables her transformation into a human alter ego named Kai, granting immunity to lethal saltwater. This power carries a critical vulnerability—discovery of her secret induces a coma, reversible only by a rare Soma flower. The duality between Narcia's shy nature and Kai's confident demeanor manifests as a split identity, often triggered by intense emotions like fear or embarrassment. This secret is accidentally revealed to Pietro and later to antagonist Kimendoji, activating the coma condition in one storyline. Her role evolves from supportive companion to central figure in Pietro’s quests. She aids his mission to rescue his mother’s soul from the underworld in their first major adventure. As their relationship deepens, romantic feelings emerge, culminating in Pietro's open crush and their eventual marriage, producing a son, Pinon. In later narratives focused on Pinon, Narcia adopts a maternal and queenly role within the PopoloCrois royal family. She wields diverse magic focused on healing and light-based attacks. Key spells include "Holy Arc" (holy light damage), "Heal Shower" (party HP restoration), and "Holy Droplet" (ally revival). She also masters collaborative magic like "Blessed Rain" (HP-restoring shower with Pietro) and "Rainbow Arc" (wind-aligned healing with Rue). Her combat utility is balanced by a critical weakness: she cannot traverse saltwater areas or fight near oceans without fatal risk, inherent to her forest witch physiology. Her development emphasizes emotional resilience and loyalty. Despite insecurities and occasional jealousy—notably during Pietro’s interactions with characters like Hyuu—she consistently prioritizes collective well-being. This is exemplified when she defies separation from Pietro during his interdimensional displacement, actively seeking reunion and managing a farm in his absence. Her journey concludes as Pietro’s queen and Pinon’s guiding figure, symbolizing her evolution from apprentice witch to cornerstone of PopoloCrois’s stability.