Illyasviel von Einzbern, often referred to as Ilya, is a character from the Japanese visual novel and anime series Fate/stay night by TYPE-MOON. Due to her white-blonde hair and red eyes, she is often considered an albino.

A young German aristocrat, she travelled to Japan to participate in the Holy Grail War as a Master. Illyasviel has an angelic appearance and unsurpassed potential as a Master. She lives in a castle on the outskirts of Fuyuki City, accompanied only by her Servant and two maids. Illyasviel asks those she feels comfortable around to call her "Ilya". Her mother, Irisviel von Einzbern, fought alongside Saber and Emiya Kiritsugu during the previous Holy Grail war. In the Heaven's Feel scenario she wears what is called the Dress of Heaven, what was worn long ago by her ancestor Lizleihi Justica von Einzbern.

The original voice acting for Ilya was done by Mai Kadowaki, and she is voiced in English by Stephanie Sheh.

Source: Wikipedia