Refill Sage, also known as Raine Sage, is a half-elf scholar and educator living in Iselia, where she teaches while concealing her lineage alongside her younger brother, Genis, in a world hostile to their mixed heritage. Years before the central conflict, the siblings fled to Iselia to escape persecution, masking their identities to secure stability.

A pivotal figure in the quest to rescue the faltering realm of Sylvarant, she joins the Chosen One, Colette Brunel, on her perilous pilgrimage. Raine’s mastery of healing and support magic proves indispensable in combat, paired with her tactical insight and scholarly knowledge. Her intellectual fervor extends to archaeology, driving her to uncover relics and decode ancient histories. Contrasting her academic prowess, her culinary misadventures yield hazardous results.

Driven by loyalty, she safeguards her brother and students—especially Lloyd Irving and Colette—from harm. Upon discovering Colette’s grim fate as a sacrificial angel, Raine allies with Lloyd’s rebellion, redirecting their mission to Tethe’alla. There, they challenge entrenched bigotry and dissect the symbiosis between the twin worlds. Her resilience faces trials through shifting alliances, including Kratos’ betrayal, and the ethical quandaries of balancing Sylvarant and Tethe’alla’s survival.

Her half-elf identity persistently complicates her journey, mirroring systemic prejudices central to the narrative. Initially a guarded protector, she evolves into a catalyst for dismantling oppression, blending shrewd pragmatism with compassion. Bonds with her companions—marked by fierce protectiveness toward Genis and collaborative trust with the group—solidify her dual role as mentor and unwavering ally in their fight for justice.