Nibelung, also known as Niberune, is a mysterious young girl who appears in the series as a supporting character. She is the princess of the city of dusk, Glad Siim, and is revealed to be the last heir of the Golden Shrine Maiden. Yuke Feldio discovers her unconscious in the Twilight city, and the Clover party brings her to the surface, where she remains asleep for several days. When she awakens, she speaks while briefly possessed by the spirit of the Golden Priestess, but later returns to her true self. Nibelung chooses to join Yuke’s team of her own will, carrying fragments of a shrine maiden’s soul within her. Her exact motivations are not deeply explored, but her decision to accompany Clover suggests a desire for purpose and protection. Her personality is portrayed as quiet and enigmatic, shaped by the spiritual entity she harbors. Within the story, she serves as a link to ancient lore and the legacy of the Golden Shrine Maiden. She develops a close bond with the party, particularly with Marina, whom Yuke entrusts to look after Nibelung as an older sister figure. Nibelung does not display overt combat abilities in the known material, but her connection to the shrine maiden’s soul hints at latent spiritual or magical powers. Her presence adds a layer of mystery to Clover’s journey, and her gradual integration into the group marks her development from a lost, unconscious girl to a willing companion.