Sapphire Kaleid, known as Magical Sapphire, is a sentient Kaleidostick and one of the main magical girl devices in Fate/kaleid liner Prisma☆Illya. She serves as the partner to Miyu Edelfelt, granting her magical powers and transformation abilities. Sapphire is intelligent, calm, and supportive, often acting as the voice of reason among the magical devices. She plays a crucial role in aiding Miyu during battles and guiding her through various challenges faced by the magical girls.