Illyasviel von Einzbern (Caster) - A parallel-world version of the Einzbern homunculus reborn as a magical girl. Cheerful, earnest, and prone to comical overreactions, she wields the Kaleidostick Ruby to fight threats while balancing school life and cosmic duties. Though burdened by her lineage and the "Magical Girl" title, she clings to optimism and friendship. Appears in a frilly pink-white dress with wing-shaped hair ornaments, radiating childlike energy tinged with moments of melancholy.