After looking into some facts about Yui from @yuikomorii's post on Tumblr, I feel inspired to make some fun and wholesome headcanons and interactions between her and the cast of SR as to counteract/compliment with her or help her with her shortcomings due to having to experience the hands of a positive environment compared to canon where she lived in the Sakamaki mansion or with the Diaboys.
Also while this made mainly for funsies, it also included some SR lore in there as well from the DL canon material
🌸In contrast to Yui who is not good in mathematics and English, on the other hand, Mitsuru is quite good with numbers as he was interested in math and geometry as a kid and Tsukasa with English as he grew up with an English professor and archaeologist as his dad. As such, the three of them would occasionally have study sessions to help her improve on that a little better. Keywords: Improve and better, not perfect. (Inspired by Mahou Tsukai Precure duo, Mirai and Liko, where Mirai is very academically talented yet is not good with math while Liko is not very talented in academics yet is great with math)
🌸Having to been confirmed that Yui has some old friends in the canon prior to the Sakamaki mansion, it’s once again implemented in this au, as she meets one of them or related to one again via Kizuki Academy’s mystery club members, Makoto and Hikari, and reconnects the bond they shared back then.
🌸In relation to Yui loving sweets, Iku, Hikari and Kaoru also happen to have a sweet tooth as well. Mitsuru, Kanata, Shinji as well to a lesser extent.
🌸Shinji and Kana can relate with her after Yui tells them about about her father, Seiji, being strict and scary despite loving her, given his uncle and her own father to a lesser extent. But they also tell her it’s mostly, in their words, that her father doesn’t want her to do things that would scare him and that his strictness and sternness is something that he knows he doesn’t like to do but does so anyways as to be better with how she acts. Something of which, unknown to Yui, Shinji and Kana, Seiji does and regretfully knows that deep down he scolded her way too much in the past and as such while still strict and stern, learns to slightly mellow out as she grew older.
🌸While she is implied to get jealous easily as she is in the canon DL, Yui’s jealousy is more akin to admiration than pure spite or resentment (similar to Envy from Inside Out 2), as well as clinginess as a result of years worth of abandonment issues. The latter part does gradually drops as she gets better.
🌸Given her love for animals, especially dogs and cats, she didn’t hesitate in binding with Riki and Akane’s pet dogs, Sparky and Ulrich and Kizuki’s student council pet cat, Luna (Yep it is indeed a Sailor Moon reference)
🌸Something that Mai and Sachika happens to know after Yui admits she has short eyelashes and would very tells her it serves as good charm point. And even so, both girls will still tell her that they love that part of herself regardless.
🌸Yui and Iku very much share a brain cell due to their similarity energetic, childish traits and their whimsy nature in getting on clouds or going to amusement parks.
🌸Naturally very clumsy given her sheltered background, but she does get a bit better on her feet in this au due to amount of fighting she had within the Hollows and Revenants
🌸Having to grew up with no tv and a smartphone, you can bet your bottom dollars that Shinji, Sachika and Daisuke would definitely showcase the wonders and benefits of watching with a TV and using a smartphone.
🌸Selenic Rebellion au-wise. After learning the real reason why Yui couldn’t stay out for too long beyond her strict household, combined with their interactions with the Diaboys, who are searching for Yui to be their sacrificial bride, the SR cast would make big precautions in their favor in teaching Yui self-defense and navigation in order to keep her safe and protected.
🌸While ultimately clear that she didn’t live with the Diaboys as to develop big low-self esteem (no thanks to their presence ofc) in this au, some part of her does have low-self esteem about herself. And it’s only through the kindness and support of her Selenic team and her friends, even admitting about their own insecurities and self-worth and esteem that she actually loves herself. Not as Yui Komori the weak and submissive bride of the Diaboys nor the vessel of Eve or host of Cordelia, but as Yui Komori, the real Yui Komori, who was truly loved as herself.
🌸Akane can attest to that statement in seeing Yui admitting she has small feet, in contrast to her admittedly big feet. As such in addition to experiencing some girl to girl time in shopping or hanging out on sleepovers, Kaoru, Sachika, Mai, Kanata, and Hikari would have Yui and Akane go shoe shopping.
🌸The SR cast can agree that Yui has some good legs and big hips. Mitsuru especially as after he and Yui get together, he can’t help but gladly take advantage of fondling Yui’s plush legs and hips. Vice-versa with Yui with caressing his smooth back and buns *wink wink nudge nudge*
🌸Either drools or nosebleeds when seeing some of the attractive or pretty Sr cast (Sachika, Akane, Shinji, and Mitsuru) in good outfits or seeing attractive yet confident and kind people in general.
🌸Mai, Mitsuru, Shinji, and Tsukasa can very much be either approve or be flustered by this teasing smooth talker trait of hers
🌸In relation to not knowing how to dance or learn any physical activities, Kanata and Iku would be her best teachers in helping her with that, thanks to Kanata experience with swimming and Iku experience with other dance moves, besides ballet (plus some ship fuel to his rare pair ship Mitsuyui lol).