Irisviel von Einzbern
Iri, アイリスフィール・フォン・アインツベルン
Irisviel von Einzbern is Saber's companion. She is the mom of Illyasviel von Einzbern. Irisviel wed Kiritsugu Emiya, who fathered their child together.
Spoilers:
Like her daughter, Irisviel is a homunculus, an artificial being created by the Einzbern. She was raised to be a puppet with no desires, but found happiness in her existence when she gave birth to Illyasviel.
She is the intended vessel for the Holy Grail.
