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.
YMMV: Kimi ni Todoke
Base Breaker: Kurumi is either an irredeemably manipulative and nasty human being who doesn't deserve to breathe the same air as the rest of the cast, or a poor, heartbroken soul who, despite her ways early in the series, really needs a hug. She is less of one among fans of the manga, in which she has very blatantly matured, becoming more goal-oriented and friendlier (to say the least) toward Sawako.
Kento is either a sweet (albeit slightly obnoxious) guy who genuinely cares about Ayane and his other classmates, or a pushy, bumbling fool unworthy of Ayane's precious time. (Of course, the latter group tend to be hardcore AyaPin shippers, but there are exceptions). In a reverse of Kurumi's situation, it's the manga fandom that can often be harsher toward him. See Broken Base below.
Broken Base: Throughout Ayane/Kento's relationship and especially since Chapter 92's release, three camps seem to be forming. One blames Kento for all that went wrong, another blames Ayane and another finds them both equally to blame and empathises with both sides of the issue.
Try and find one fan who doesn't love Ryuu. Go on. Just try. It's probably going to take you a while.
A huge, huge amount of fans still reading the manga are only keeping up with it for the supporting couples (namely Ryu/Chizu and Ayane/Pin as opposed to the main couple of Sawako/Kazehaya, although there are a few rooting for other pairings as well).
Ayane has a considerable following for being the Cool Big Sis of the group and a no-nonsense, proactive Shipper on Deck for both of her best friends' and their respective love interests. She's also appreciated for fending off Alpha Bitches trying to ruin peace, and she's been undergoing a good bit of Character Development lately.
Fan-Preferred Couple: A lot of fans still ship Ayane/Pin over Ayane/ Kent, even though the latter ship is the one currently sailing. Ayane/ Kent still has a decent support base, though, and there's been a surprisingly small amount of Ship-to-Ship Combat or Die for Our Ship going on (for now, anyway). Both fandoms' tolerance for the respective "rivals" may come from the fact that a) the readers are mainly Ayane's fans and both guys are really caring and supportive to Ayane b) Pin is Ayane's teacher, so one group sees him as the future option for Ayane, while she's dating Kent "for now", while the other accepts his presence as long as he doesn't interfere with the current ship.
And then, of course, we have the credits of the live action adaptation. Sawako and Kazehaya share a moment, Sawako's parents share a moment, Chizu and Ryu share a moment, and who does Ayane share a moment with? Kurumi.
In fanon, Ayane tends to be portrayed as a lesbian, bisexual, aromantic, asexual or demisexual. Very few fans seem to headcanon her as straight.
Values Dissonance: When Ayane lets her older boyfriend know that she wants to break up with him he hits her. He does this hard enough to leave a mark, and she's seen wearing a bandage for a couple episodes too. After she explains how she got the bruise to her friends, the issue is never really talked about again, and more or less shrugged off.
A lot of Ayane's Character Development has pushed her into this position, since she spends a lot of time lamenting over not being able to feel love for any of the guys she dates. Considering this and the fact that two of the three boyfriends we've seen her with in the series have treated her horribly, it's hard not to feel bad for her. Not to mention that she has some serious self-esteem issues herself.
Chizu, too, as of later chapters. She's had to deal with her childhood best friend confessing his love to her out of the blue and the consequent awkwardness, culminating in her slow realisation of her own feelings for him, followed by said friend announcing that he's going to go away to university. Her reaction to all of this is, understandably, not the most cheerful thing to observe.
Jerkass Woobie: Kurumi. She may well be an Alpha Bitch in a series where this is especially obvious, but you can't help but feel sorry for her at points. Recently she's stopped being a jerkass and is in full-on Woobie territory with how obsessive she is about her studies and becoming a teacher now that her romantic dreams have been crushed.
Stoic Woobie: Ryuu. He's been in love with a girl who doesn't return his feelings for pretty much his entire life, his eventual confession to said girl was rejected and his mother died in a sudden accident when he was little, but don't expect him to seem anything other than apathetic most of the time.