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 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.

Fate/Accel Zero Order
Within the timeline of this singularity, the Einzbern family didn't adopt the strategy of bringing in an outside mage as their master of the Fourth Holy Grail War. Because of this, Kiritsugu and Iri never initially met and a relationship would not be started. Instead, Kiritsugu would become a Counter Guardian known as EMIYA while Iri would become the master of Saber in the Holy Grail War. The Counter Force, knowing that Einzbern's activation of the Holy Grail would bring forth All The World's Evils and bring ruin to the world, summoned EMIYA with the intent of stopping this process from happening. Using his knowledge of how the Holy Grail works, EMIYA decides that the best way to stop the War is to kill the Lesser Grail, Iri.

The two officially first meet when EMIYA locates Iri near Fuyuki Bridge while she and Artoria are battling Ritsuka Fujimaru and his servants Mash Kyrielight and Lord El-Melloi II. EMIYA takes the opportunity to try and kill Iri, but the attack gets blocked by Mash, who was already on the lookout for potential assassins during the fight. EMIYA explains his reasons for wanting to kill Iri, only to be met by Artoria attacking him in retaliation with Ritsuka, Mash, and El-Melloi joining in against him. With his position compromised, EMIYA retreats from the battle. As the group recovers, Iri, finds herself feeling like she has some sort of connection with EMIYA and that they were destined to kill each other.

EMIYA would make another attempt at Iri's life at the Einzbern Castle after the retreat of Iskandar, Lancelot, and their masters. El-Melloi, whose group was initially there to defeat Gilgamesh, deduces EMIYA's identity as a Counter Guardian before revealing to him and Iri what his group's mission was before offering them a way to end the war without the need Iri's death. When EMIYA shows confusion over what El-Melloi was offering, El-Melloi asks EMIYA if he wanted to kill Iri regardless of circumstances or if he could complete his mission in other ways. This ignited a conflict within EMIYA as he didn't think he had a choice in killing her, before ultimately saying he would like to try despite never having these kinds of feelings before.

EMIYA, Iri, and the others would make their way to the cavern where the Greater Grail was held. There, the two would participate in the defeats of both Iskandar and Lancelot, accidentally activating the Greater Grail and creating a manifestation of it in the form of a darkened version of Iri. After defeating the Greater Grail's manifestation and ending its threat, Iri was left without a purpose for her ability to become the Holy Grail was now gone, and she would no longer be welcomed into the Einzbern. Mash proposes that she return with them to Chaldea, to which she agrees. As the groups begin to part ways, EMIYA tells Iri that he feels thankful he was able to complete his mission without having to kill her (although he feels not worthy of thanking her) while Iri is glad to have met a servant like him.

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.

Quotes
"Hmm, what's this? This feeling... It can't be, is he here? But... I feel as if something bad has captured him..."

- Irisviel (Dress of Heaven)'s My Room Dialogue on EMIYA (Kiritsugu) in Fate/Grand Order

"My Dear, even if you forget me, I will always remember you. Even if my voice won't reach you, I..."

- Irisviel (Dress of Heaven)'s relationship with EMIYA (Kiritsugu) from Fate/Grand Order material III

"Einzbern's homunculus. She's supposed to be an unfamiliar companion, so why is my gaze attracted to her...?"

- EMIYA (Kiritsugu)'s relationship with Irisviel (Dress of Heaven) from Fate/Grand Order material III

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