IttoSara

IttoSara is the het ship between Arataki Itto and Kujou Sara from the Genshin Impact fandom.

Canon
Itto's Vision was confiscated after he was defeated by Sara while the Vision Hunt Decree was still active. Ever since then, Itto has been determined to have a rematch with her. Throughout all of Inazuma, he proclaims his intent to duel with her by vandalizing bulletin boards, much to Sara's annoyance.

When talking to Uesugi, he talks about Itto and his plan to take revenge on Sara ever since she confiscated his vision. Telling that Sara saw that he was very serious about the revenge and his fighting spirit was commendable, so they picked another day for the duel. But Uesugi told that somehow, Itto insisted that due to some weird Oni rules, the rematch must be a sumo showdown on the crossroads. However, the duel never happened as Itto was dragged by a masked lady.

In the Ritou Bulletin Board, Itto calls Sara "Kujou Tengu" and messages her on the bulletin board, trying to stop harassing outlanders all the time. He notifies her to not forget the beating that she gave to him, telling Sara that she cannot escape their rematch. Sara finally messages him on the bulletin board, asking him to stop vandalizing the bulletin boards. She told that she will grant his wish upon the rematch once the war was over. She tells him to knock it off already, and told that she would've already sued for harassment if she wasn't an officer of the Kujou Clan.

Voicelines
Sara states that she gets a little irate when Itto's name comes up, she talks about him, kicking up a big fuss when she confiscated his Vision. Sara says that Itto, is by far, the noisiest oni she have ever encountered. Sara talks about him, insisting to rematch her, Sara then tells she still doesn't want to talk about it, Sara tells the Traveler if they really must know, then they would to go and ask him themselves.

Quotes
"Tsk... I can't help but get a little irate when his name comes up. He kicked up a big fuss when I confiscated his Vision, by far the noisiest person... no, the noisiest oni I've ever encountered. He showed he was enough of a man to admit defeat, but the rematch he insisted upon... Tsk... To this day, I still don't want to talk about it. If you really must know, you can go and ask him yourself."

- Sara's voiceline "About: Arataki Itto"

"Don't you dare die on the battlefield, Kujou Tengu! You still owe me a duel!"

- Itto to Sara

"You don't get yourself killed either, you idiotic Crimson Oni."

- Sara to Itto

Fanon
Fans have taken note of Sara's and Itto's dynamic ever since Inazuma has been released, although the ship only started to gain traction after more information spread about Itto and especially after his design was revealed. People enjoy the rivalry aspect of their relationship, as well as the trope of the loud, active character shipped with the disciplined, analytical character.

A lot of fanart pokes fun at their relationship, featuring Itto demanding Sara's attention or being affectionate while Sara is annoyed. Another trope that can often be observed in fanwork is Sara being the dominant "girlboss" partner in the ship that has to keep the more active Itto in check.

IttoSara, although only recently gaining attention, has already been in the spot of controversy. Some people have claimed their relationship is unhealthy and that Itto harasses Sara, but many disagree with this perspective.

Fandom
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Trivia

 * They both have non-human blood. While Itto has oni blood running through his veins, Sara is a tengu.
 * In one of her teapot voicelines, Sara tells the Traveler that a "Red Horned Lizard" would be a nice pet. Itto, notably, possesses red horns.
 * People who have lost their Visions are noted to lose their ambitions and become lost in life, but Itto continuously pursued his rematch with Sara even after his Vision was taken away.