These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Foe Yay: Kyoko and Sho have a fair amount of this when they're reunited post-breakup.
Also some between Sho and Reino. Kyoko even accuses Reino of having a "Sho fetish."
Fridge Brilliance: When Kyoko worries that Ren will cut all ties with her in Karuizawa, it seems a little too far-fetched. Until you realize that that's how she's used to being treated by those she cares about. Her mother abandoned her when she was a little girl, Fuwa Sho dropped her without a second thought after she spent years devoted to him, even Corn left without giving her a way to keep in touch (although in his case it was because he was ten years old and had to go home).
In Sho's PV, Kyoko has to act out an angel who has a lot of this with another angel. She perfoms a brilliant act that actually enraptures the other angel's actor, who dislikes her. How did she find the inspiration for this? By inserting Moko into the other angel's role in her mind.
During the party arc, Moko immediately goes to look for her present for Kyoko, in response to Ren's gift upon learning it was her birthday. All of her expressions, thoughts and mannerisms wouldn't be out of place on a jealous girlfriend.
Magnificent Bitch: Not that Kyoko is one, but as seen in the "Natsu" drama, she can be very good at acting like one.
Real Women Never Wear Dresses: The first time they meet, Kanae scorns Kyouko for being "housewifey" only because she sees her sewing a doll (Kanae's unaware that the doll is a voodoo doll which Kyouko intends to use for Black Magic); and for a while she dismisses Kyouko because she didn't believe that a woman who can do every stereotypical housework could be a competent actress. But turns out that Kanae's also housewifey, in this case by necessity - and really good at it. Seeing Kyoko pissed her off because she was reminded of herself. Though her version of "housewifing" is more of a extreme sport though.
"You made me remember the scent of detergent!"
Unfortunate Implications: Rife, though actually less so than in most Shoujo romantic comics. The above under ultimate job security applies.
As does a incident with Reino the psychic and Corn the rock. The powers are real—he gets some information he shouldn't have. He also states that the pain 'Corn' put into the eponymous stone before giving it to little Kyoko is "not the kind of feeling an ordinary child from an ordinary house could have" and makes her accumulated suffering over ten years of being used, abused, and unloved by everyone in her world look minor. Given that Corn was not a fairy prince but a Hollywood Brat with two doting parents, looks, talent, health, and everything money could buy, Unfortunate Implication set in.
Especially because it sounds so much like Erica's intentionally absurd speech way back during the Kyurara auditions, about how "poor people couldn't possibly understand emotions and portray them like rich people!" (Her manservants chime in that that is 'very logical, Miss Erica.)
Eh, it might just mean Ren is a wuss and Kyoko is tough, and Reino is picking up the Wangst difference and misinterpreting it. A stretch, though.
It should also be noted that, judging by what he "saw," it also contained Ren's emotions as an adolescent, where he is viewed attacking people on the street as some of them run away, hands covered in blood so it's possible he was also referring to that.
Events later in his history seem to indicate that - for all his parents' support - young Kuon was ostracized from his peers (not to mention bullied and abused) due to his parents' fame. It is implied that if Rick hadn't given Kuon something to live for, Reino's prediction would have come to pass. Kyoko at least had Sho for a touchstone (unreliable as he may have become).
There is a possible explanation for the osmosis of events post Kuon's leaving Kyoto: Ren had had quite a bit of contact with "Corn"-the-stone before Reino got near it (even kissing the thing). He might have managed to transfer a little of his later, more bloody backstory along with. It is clutching at staws a bit, but he does start lightening up towards Kyoko (and his old self — ish) after the couple of Corn incidents.
Also the degree to which Kyoko is becoming the B-plot of her own life in favor of Ren now that he's coming close to being acknowledged as her Love Interest.
Also Reino's psychic perception of "Corn's" suffering as hugely worse than Kyoko's, when it was a ten-year-old boy having trouble establishing an independent identity when his doting father was so famous, while she made it to sixteen emotionally abused from every side and almost totally isolated. Could just be that she's much better at coping while he wallows, though.
Also everything relating to race, from the perspective of an American audience, because the Japanese have very different ideas about ethnicity and race-mixing.