Ittomiya

Ittomiya is the het ship between Arataki Itto and Naganohara Yoimiya from the Genshin Impact fandom.

Canon
The two currently do not interact in the game story or events. Althought, both clearly know each other through their voicelines.

Voicelines
Yoimiya has two voicelines about Itto. In the first one, she mentions that Itto, despite his scary appearance, is very popular with kids, just like her. Aside from that, she also states that Itto is also very competitive (since he thinks every battle should be taken seriously) and when both of them are playing with the kids together, it always turns into a showdown between them.

They would try, for example, eating a bowl of ramen soup in one go, or try to eat sour plums without making any strange faces. The children who are presented will try to guess the winner, which pressures both characters to try to win the competition immediately.

Yoimiya's second voiceline about him implies, in a surprise tone, that she didn't know he was part of a gang, and it also says she thought he just had alot of free-time. Curiously, Itto doesn't seem to know that Yoimiya didn't know he was part of a gang, or he simply just never mentions it.

Similarly, Itto's voicelines mentions that Yoimiya is always showing off her fancy fireworks and toys to the kids, which makes Itto envious and "Sick of it". He tells the traveler that nobody should be allowed to steal his "thunder" and he is the one that's supposed to be adored by the kids, which also goes for the traveler, and he also states that they should stay on his side on this instead of Yoimiya.

Character Story Profiles
Yoimiya's Story in Story 4 mentions that Yoimiya's "second career", which are her distinctive handicrafts and practice works, or in other words, her personal made Toys, which are inspired in the games of common people, are adored and very popular alongside the population of Inazuma, especially kids, and even adults, and later mentions that Itto adores them as well.

The head of the Arataki Gang comes over to buy her specially-made knickknacks, which he then brings to go challenge the one he has declared his nemesis. Interestingly, the story also mentions that Yoimiya made a somewhat-failed "Onikabuto Chariot toy".

Onikabutos are shown to be a obession of Itto. They are one of his ascencions materials, they are shown during his Story Quest, and his lore states that lately, the children have been very into Onikabuto battles against Itto and that his gang even considered creating an Onikabuto festival for the turnout of the year.

Given the attachment that Itto has on Onikabutos, it can be theorized that Yoimiya's failed chariot was going to be given to Itto, or at least was linked to him, since the story mentions him later. It could be also be a spoiler for Itto, since he was released months after Yoimiya and was first introduced in her voicelines, being theorized at first to loving beetle tournaments.

Quotes
"Oh, he may look scary, but he is very popular with the children. However, he can be very competitive. Every time we play with the children, it always turns into a showdown between him and me. For example, we'd drink a bowl of ramen soup in one go, or try to eat sour plums without making any faces. The children will cheer us both on and try to guess the winner. And when that happens... well, then I can't let him beat me, right?"

- Yoimiya's Voiceline about Arataki Itto

"Arataki's gang? Huh!? So he isn't just someone with too much free time on his hands?"

- Yoimiya's Voiceline about Arataki Itto II

"Hmph, she's always showing off her fancy fireworks and toys to the kids. Well, I'm sick of it! Nobody steals my thunder! I'm the one that's supposed to be adored by the kids! Me! That goes for you too, you're siding with me on this, okay... Huh? Whaddya mean, you're not a kid? Eh, details. If you're shorter than me, you're a kid as far as I'm concerned."

- Arataki Itto's Voiceline about Yoimiya

Fanon
Ittomiya is a small ship within the Genshin Impact fandom, being considered a rare pair. The fans of this ship mostly like the dynamic of the duo, especially since both characters are shown to be very enthusiastic and friendly, and overall, very energetic.

Their matching personalities and funny contrast are often portrayed in fics, since they are seen as a comedic pairing. Those who don't see their dynamic as romantically enjoy their dynamic as best friends or as a found family, sometimes making Yoimiya part of his gang.

The ship is usually overshadowed by more popular ships with both characters. Its rival ships are IttoSara and IttoGorou, which are some of Itto's popular ships, and Ayamiya, which is one of Yoimiya's popular ships.

Fandom
FAN FICTION

TWITTER

PIXIV

Trivia

 * Itto and Yoimiya birthdays are next to each other. Both characters were born in June.
 * Both characters have a gigantic bow on their backs in their respective designs.
 * For the 2021 Game Awards, Genshin Impact won the Best Mobile Game award. Mihoyo made an entry video during the ceremony where both Yoimiya and Itto were showcased.
 * In the video, Yoimiya is running towards Itto, seemingly at the start of a competition between them and the kids, who are jumping and cheering for them in the corners. Itto states that he is the one who should be adored by the kids, a reference to his voiceline about Yoimiya, and Yoimiya replies, in a humorous tone, "Not if I have to say anything about it".