イリヤスフィール・フォン・アインツベルン

A Teutonic aristocrat, she traveled to Japan to participate in the Holy Grail War as a Master. Illyasviel is a young girl with an unprecedented degree of magical power. Illyasviel asks those she feels comfortable around to simply call her "Ilya".

She lives in a castle on the outskirts of Fuyuki City, accompanied only by her Servant and two maids.