Homunculus of the Einzbern family and later the wife of Kiritsugu. Carefree and innocent, she has both the elegance of a woman and the childishness of a kid. Still, she can understand well what Kiritsugu is going through even if she can't actual understand the meaning of his ideal.
Iris is artificially created by the Einzbern to serve as a vessel for the Holy Grail. Kiritsugu who was employed by the Einzbern to secure the Holy Grail gave Iris more than a purpose. Iris became Kiritsugu's lover and the mother of his child, Illyasviel who is artificially created using Kiritsugu's sperm and Iris's egg with sorcery. Iris was grateful to Kiritsugu who gave her love and a family and shown her that she is more than a puppet.
Irisviel von Einzbern is created by Gen Urobuchi and designed by Takashi Takeuchi as one of the main characters for the Fate Zero anime series. She originally appears in the visual Fate Zero, and makes her first anime debut in Fate Zero episode 1, Summoning the Ancient Heroes. She is voice by Sayaka Ohara in the Japanese version.
Being a Homunculi, she has striking red eyes and white hair that extends past her nape and shoulders. For clothing, she wears her regal white dress when she is at the Einzbern mansion. In Fuyuki city, she usually wears a violet, long sleeved shirt with a white skirt.
She is a kind and sweet woman who is very outgoing and determined. She does not want others to have pity on her when she hides the fact her body is failing from Saber and Kiritsugu. She only tells Maiya who is not sympathetic. She often tries to patch things between Saber and Kiritsugu whose philosophies are stark opposites.