The Servant and wife of Sōichirō Kuzuki and a talented mage. While Caster in the canon series is haughty and cruel, Caster in Carnival Phantasm flips between acting dignified and lovestruck over her master/husband. Although she is devoted to Sōichirō, she also has an obsession with Saber, creating dozens of figurines of her and hoping to kidnap her so she can dress up Saber in homemade outfits. Unlike the visual novel and anime, she almost never wears her hooded cloak.