ReiMiri

ReiMiri is the family ship between Rei Suwa and Miri Unasaka from the Buddy Daddies fandom.

Canon
Buddy Daddies focus on Rei and Kazuki raising Miri under one roof unlike Kazuki Rei is very much quiet and a stoic type being a hard cold assassin causing him to be a very different kind of father to Miri. Miri and Rei have very different personality Miri is very upbeat and cares a lot about Kazuki and Rei she seems to happy all the time very much matching the energy of Kazuki meanwhile Rei is very much the opposite of the both of them he is quiet and stoic as he often talks about how Miri should stand up for herself. At first, just like Kazuki, he wanted to get rid of Miri from their lives, eventually finding out information about Miri's mother, Misaki. However after spending time together with her, he also began to change his mind over giving her away to Misaki and rather keeping her with Kazuki. Now, knowing that this would lead to many consequences, especially being accused of traitors for leading a home life outside the organization, which was forbidden, the two are determined to lead a life as a family together with Miri, especially promising Kyutaro not to regret that decision.

The most noticeable moment that developed their relationship was when Miri called out for help to her papa (Rei) after being held by park rangers mistaking her as a lost child. Rei was hidden and willingly on not helping her at first, but after hearing her shouting out for help, it's when he realizes he didn't want her to end up just like him from the past, and remembers her words of the term "Papa", being the person who saves you if ever involved on troubles. He steps out to tell the rangers the child being his by saying outloud his promise with Miri for playing together the next day. After being asked if he was anyhow an acquaintance of hers, to which he denies, and instead claims being her papa. She's surprised to hear it, since he intially disliked to be called like that before and instead going by his name, and when he tells her to go home together, she frees herself from the guards' grip and runs straight to him to then hug him, Rei also carrying her and repeating the last sentence of going back home, Miri agreeing as the two walked back to the apartment with Kazuki.

Along with Kazuki, having officially accepted Miri as her family as well, Rei comes to every Miri's need, hesitant at times, along with Kazuki (although Miri sometimes forced him when he refused to help). He also picks up certain habits from Miri, such as eating her favorite cereal (which she liked immediately after trying it), making french toasts, and sometimes teaming up to help Kazuki with what they can. He also allows Miri to join him to play video games, something he's not done before.

Intially, along with Miri, they used on not helping out with the chores, eventually they learn the lesson (most on Rei's part) by Kazuki leaving his partner taking care of Miri and also the rest, of course not saying anything to them and instead leaving a note to them. Rei makes his best efforts to take care of Miri's needs but also needing some help at times, this lent by the kid herself. However, Miri's health is neglected for a moment, since she falls ill one day on Rei's chest as they slept in the bathtub. With his options having ran out to help her, he decides to take her to the hospital, however it turns out that he himself did not know where it was located. Without Kazuki around, he goes to Kyutaro for his help instead, which he notably agrees to when Rei is visualized holding Miri's hand while they were sleeping, and once Kazuki comes back and sees them, he smiles at the scene. As an apology, Rei and Miri make French toasts for Kazuki remarkably with effort, but since they didn't fully know how to make it, the result wasn't good at first sight. However, instead of getting an approval, Kazuki reprimands them he would teach them how to make real French toast, overwhelming both at this claim. Rei asks Miri what they should do now, getting a complain from her part saying that he said he could do it as a manner to accuse him.

It is also to be noted him being protective of Miri with Kazuki, like when Taiga (Miri's classmate) gets very close to her, and both already have murder intentions towards the boy, shown in "Love is Blind" and "No Sweet Without Sweat", different situations involved. While in the latter case was because it was Miri's field day and both had to work together in order to make their team win, Rei's serious response being "He dies." twice, on the former Rei doesn't seem to be affected after being contexted that Miri was only looking for her classmate despite both had a "fight", which ended up to be a misunderstanding and only turned out to be Miri trying to stop her classmate from being mean but accidentally hit him. However along with Kazuki, they take down a robber who tried to harm Miri and the other kids, and prior to this they were already planning to do so after getting bad vibes from the man. It also seems to be Miri has more favoritism over Rei than Kazuki, the latter gaining jealousy of sorts, Rei sometimes teasing him with this fact.

During Miri's field day, especially on the lunch break, Miri sees that Rei's prepared rice balls of different flavors. Seeing Miri having enjoyed the meal and also excitedly thanking Rei for it, Rei gives her faint smile. When it's time for her race which would determinate whether she could get or not the gold medal, he's unsure whether to cheer up for Miri like the other parents did for their kids, this insecurity being noticeable during the episode and Kazuki tries to help him somehow, to no avail. However he gains determination and shouts Miri to go for it, but inmediately regrets it after Miri falls upon hearing him cheering up for her. She doesn't get the gold medal but manages to be placed second, however Rei feels very guilty over his prior action which made her lose. He monologues cheering being complicated as he sees her and Kazuki on their way to participate in parent-child games, Miri telling Rei to look at them, also assuring getting the gold medal this time.

Rei gets to participate when Miri drags him during the seavenger hunt, in which there's a box full of cards with different things written in each. The reason of this action was because after taking a card, she straightly goes to Rei, and when she asks both of them to run they understand as Rei and Kazuki give a silent agreement to then carry Miri by each hand and run together. They end up winning as they were the fastest team, and this time Miri manages to get a gold medal. After winning, Rei asks about the content inside the card she's picked up before, and she shows them the content written inside it: Family. It surprises Rei.

When they learn they had to give Misaki a chance to live on with her daughter now as a real mother, the three of them enjoy their last day together by spending a family day outside home. Rei sadly gazes at a half-crying Kazuki when he's hugging Miri, as they both acknowledged they had to let Miri go, and Kazuki was notably most affected due to them having to tell Miri the truth and for also taking [Misaki]'s happiness, but recovers after Rei comforted him believing Miri couldn't understand right now and that they still had a day to have fun while smiling. They all continue to spend the time together playing video games in arcades, Miri complimenting Rei being good at them, and afterwards go shopping. At night, they ride a ferris wheel, Miri enjoying the sightings outside. Kazuki and Rei have a brief talk especially focusing from when Rei brought a cat at the department, Kazuki reminds his words from back them over how it was kinder not to get involved, and if not prepared, doing so could make things worse. Rei asks him why he was saying that right now, to which Kazuki says that they were still on time to give [Miri] a normal happiness, surprising Rei. Kazuki mentions the different things he wanted Miri to do, and before Rei intervenes, according to Kurusu, there was still something they only could do, Rei biting his lips in realization. While contemplating the overview, Rei thanks Miri undertone for showing him things he'd never seen before, and Kazuki follows up by saying it was time to wake up from the dream.

Kazuki and Rei try to lead their lives as they normally did before meeting Miri, however the change suffered after the girl's absence is also remarkable. Rei apparently can't fully concentrate because when playing videogames, the "Game Over" is always displayed on the screen that rarely appeared, eat Miri's favorite cereal, spending time outside at the park, watch her favorite TV show, and ultimately they point out their noticeable changes after her absence. Rei also announces that his departure back home for the New Years' since he was told to, leaving Kazuki with the apartment, however the offer was rejected as this latter wanted to live somewhere smaller.

Having gone back to his father, Rei is surprised to see he's assigned to kill Miri, and is very reluctlant and even tries to persuade him on going for someone else instead of her, but fails to convince him when Shigeki reaffirms his position as the leader of the clan and also Rei's as heir to the family to accomplish the mission without hesitation. After Kazuki and Kyutaro manage to bring Miri safe to Kyutaro's refuge afterwards temporarily getting Ryo Ogino away from them, Rei arrives and asks for Miri on fear. After being told and also seeing she was fine, he lets out a sigh of relief. When the tables turned between Rei and Kazuki about whether to keep Miri or not (Kazuki refusing to do so out of fear of hurting Miri further without noticing), Rei steps out telling him they had to protect her, and they could change, this time being the one they'd make Miri happy. Managing to convince a hopeless Kazuki, Rei also agrees on being faithful on the household rules taught by Kazuki, smiling as response. Along with him, they announce to Kyutaro quitting the hitmen business to instead become a real family with Miri.

On the day of Christmas Day, in which Miri's performance was about to be held on, they have to do something before assisting to the event. They promise Miri on coming back to see her, Miri showing her pinkie to Rei, gest mistaken as a "loyalty oath" by him, getting a slap on response by Kazuki. Miri and Rei make the pinky promise and she leaves them to return inside the daycare. On their way to the place, Rei asks Kazuki if he ever believed on Santa Claus, and after agreeing with his negative response, he adds on Miri's believing in him since they first met her, also reminding the parents' duty on keeping the kids' dreams alive, Kazuki agreeing by adding even if it means lying too. During the discussion between the Suwas, Rei informs his father how many things he was shown while spending time away from the organization and him, more than all his partner Kazuki, a family and also experiences that he'd always treasure, as well claiming sharing a bond stronger than blood with them, and that he really wanted become a real family. Also to prove his point that his hands had no purpose if his assassin's blood gets in the way of that, and wouldn't let him to protect them, he shoots his arm by himself and leaves but not before bidding farewell to the boss, referring to him as "father".

Upon seeing her fathers arriving at the performance as promised, Miri brightens and sings louder "Silent Night" along with her other classmates. After it, Miri goes to her fathers and hugs an injured Kazuki (unaware of this) while Rei compliments her singing. Miri agrees, claiming that she sang so loud, and asks if both think that Mama also heard too, both giving an affirmative answer, and shouts a thanks to Santa Claus.

In the time-skip, it's revealed that him and Kazuki oficially adopt Miri and also running a diner. Rei's cooking skills also improved, shown when he serves some french toasts with other ingredients added in too. However, Kazuki advices him to expand his repertoire. At the end we get to see several photos of the three of them but especially focusing on Miri's her growth over time from a child to today's adolescent to then the unrevealed photo of the three from the Christmas Day taken by Anna.

Fanon
ReiMiri is one the most popular family ships alongside KazuMiri and Kurusu Family, though Rei and Miri are a more popular duo than Kazuki and Miri, as Miri tends to tease and play with Rei more than Kazuki, having like a brother-sister dynamic (mentioned by Kazuki, saying that he feels he has two children around). Some fanarts about Rei playing Miri are about these two having fun, like playing Morio Kart, eating their breakfasts together, or both sleeping together, as they usually do. In some cases they include Kazuki in them, and some of them are about Rei and Miri teaching him how to play videogames.

These two are usually compared to Anya and Yor from Spy x Family, as both Yor and Rei are terrible at cooking but still try their best for their kids, respectively Miri and Anya (though Rei began to make better dishes over time). A common parallel between them is they day when both Miri and Anya punched a kid (though Miri did not, it being only a misunderstanding). While Kazuki (being compared to Loid Forger) and this latter were trying to resolve the situation, both Rei and Yor were more focused on how their battle ended: when Rei got the news, he asked Miri if she won the fight, while Yor was the one who taught Anya how to fight.

On AO3, the ship has over 70+ family fanfics.

Fandom
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Variations

 * Kurusu Family — the ship between Kazuki Kurusu, Miri and Rei