KirIri

 is the het ship between Kiritsugu Emiya and Irisviel von Einzbern from the Fate fandom.

Fate/Zero
Kiritsugu Emiya met Irisviel when she was created inside a tube. Through their initial interactions, he discovered that she was useless and Kiritsugu expressed his frustration to Jubstacheit von Einzbern (the creator of Irisviel) regarding Irisviel's lack of understanding to protect himself and interact in society. So Jubstacheit decided to prove Irisviel's durability by casting her into the deserts of the Einzbern forests. Disgusted by Jubstacheit's actions, Kiritsugu rescued her and personally began educating Irisviel about current society and the modern world so that she could develop a sense of identity. Her rapid development and unexpected insights into humanity surprised Kiritsugu and they fell in love with each other. However, Kiritsugu knew that their love would end up in tragedy, as he would have to sacrifice her for his ideals.

Fate/kaleid liner PRISMA☆ILLYA
In the Fate/kaleid timeline, Kiritsugu and Iri's relationship played out much the same as it did in Fate/Zero until when Illya was born. In this timeline, she was born to be used directly in the Fourth Holy Grail War, something that didn't sit right with her parents. Kiritsugu and Iri discussed abandoning the war, and the Einzberns altogether, with them ultimately agreeing to do so while Illya was eight months old.

With the turmoil Kiritsugu and Iri would have gone through averted, the two were able to live a happily married life. Currently they travel abroad constantly, Kiritsugu moreso, but take as much time as they can to be together.

Children
Illyasviel von Einzbern Also known as Illya for short, she was Kiritsugu's and Irisviel's biological daughter, conceived and born 8 years before the Fourth Holy Grail War. The Fate/Zero Drama CD revealed that the two made the choice to have her out of a sense of love, as well as to give Kiritsugu a reason to make it out of the war alive. Despite seeming human, Illya was a homunculus like her mother, and the odd nature of her birth resulted in her development being irregular. She had a very cheerful personality, and was shown to be the only one that Kiritsugu could be genuinely happy and comfortable around.

When the time came for Kiritsugu and Iri to depart for Japan to participate in the Holy Grail War, the former promised Illya that they would return, to which she gladly accepted and waited patiently. However, Iri was killed during the closing hours of the war while Kiritsugu, out of remorse for his actions during it, stayed in Japan with his new adopted son, Shirou. These facts, combined with manipulation from the Einzbern family head, Jubstacheit, caused Illya to become more unstable and giving her a need for revenge for her father's supposed betrayal.

Fanon
On AO3, Kiritsugu x Iri is the second most written ship for Kiritsugu and the second most written for Irisviel as well. It is the seventh most written ship in the Fate/Zero tag.

Fandom
FAN FICTION