Critical Research Failure: Chris talking proudly about how her great-grandfather fought for the just cause in the battle of Stalingrad shows how little the authors know and understand about European history. That or Chris is actually a neo-nazi.
Alternatively it could be that they have a different history.
It's shown quite often that Chris knows almost everything there is to know about Japan... and almost nothing about Europe. In A-1, it even calls into question whether or not she could speak German.
Americans Hate Tingle: Tsubame is significantly less popular with Western readers than Japanese ones. While she placed second in the 2014 poll on Minatosoft's website, she has a divided audience at best among English readers. They believe that she has poor chemistry with Yamato by making him uncharacteristically submissive, that the story hypes her too much and that she's far too easily forgiven for her deceptive and selfish behavior.
Gen was surprisingly one of the most popular characters from the original game, which led to him becoming a member of the Kazama Family in the later versions.
There was a popularity poll in summer 2014 that finished at the end of August. Only three of the original heroines placed in the top ten with the highest being Wanko in fifth.
Margit placed first in the summer 2014 character poll despite being only a supporting character with a short route.
Lee, a character that barely even had a name in the original, managed to reach sixth place with barely a hundred votes separating her from beating every original heroine.
Benkei made it to fourth place, giving her triple the votes of her boss, who only made it into the top twenty.
Perhaps most strangely of all, minor Punch Clock Villain Rinchuu managed to secure third place with nearly twice the votes of Benkei. Her fandisc hadn't even been released yet, meaning that unlike the above three she didn't even have a route.
Ageha Kuki. If there's one woman who hasn't have a route, it's her. Nearly every fan wanted her to have her own route, and she's (so far) is the only woman who does not have one, but her sister Monshiro does.
Lisa Brinker, a member of Margit's Hound unit, is gaining attention thanks to Minato-soft's website showing who will appear in Margit's Afterstory route. Since then, fans wanted her to have her own route. In fact, most of her info was translated in The Other Wiki while the others have yet have theirs. Currently unknown if she'll gain her own route. A lesser degree occurs with the rest of the team however, with the exceptions of Segrun and Thelma.
Sheila, a minor character introduced to act as Stacy's rival for A-3, apparently proved quite popular and managed to net her own ending in A-5's Takae route and has a supporting role in the other routes as well.
Ho Yay: Yamato and Cap's close friendship coupled with Capt's lack of interest in girls leads to this and is Lampshaded relentlessly.
At the end of Monshiro's route, Miyako, Momoyo and Capt all declare their love for Yamato and acknowledge Monshiro as a rival. Capt clearly doesn't get what definition of "love" they're using.
Gakuto and Moro apparently give Miyako BL vibes. The fact that Gakuto finds Moro cute as a girl doesn't make it any better.
Jerkass Woobie: Kokoro. In her route, it's revealed that she's actually a very lonely person, not even having any real friends in Class S. Yamato helps her make friends with Mayucchi and Iyo, but she still turns other people away from her with her terrible attitude. Things get worse for her when she fails an exam and ends up demoted to Class F. Since she's done nothing but insult them up until then, the class instantly shuns her and treats her as an outcast. While you could definitely say she brought it on herself, it's hard not to feel sorry for her.
Les Yay: It would be easier to list the characters who don't have this sort of relationship with at least one other character. To name just one, Momoyo flirts with girls far more frequently than she does with guys.
The Big Sister types in general tend to be pretty openly bisexual.
Even Yamato's hermit crabs have the "moe eyes"◊. Though, that's probably just how he sees them.
Narm: The translation for S gets a little...strange in some routes:
For some reason, each of the Kuki siblings begin to refer themselves as "We" and "Us" for no reason
Yamato's penis is refered to as his "Johnny" several times.
He also has some very juvenile comments about Koyuki's assets, saying she "Knows how to shake what her mama gave her" and points out that he "Boldly felt up them titties" in her route. Yes, he actually said that.
Nightmare Fuel: In the Visual Novel, at least one fight scene with Momoyo emphasizes the violence with FMV shots of breaking bones in X-ray views.
There's also Miyako's death glare in the visual novel... *shudders*
The "Future with Hermit Crabs" route in S. It's supposed to be funny, but the fact that Yamato's pretty much lost his mind and becomes sexually aroused at the sight of his hermit crabs (and even masturbates over them) is just very, very disturbing.
Tatsuko's rage. She goes from being a friendly, lazy girl with a slighty annoying voice, to something that's more akin to a rampaging monster screaming like the spawn of Satan than anything else. What's even scarier? Momoyo is intimidated by her! Let that sink in. God knows what would've happened to Yamato if she found him...
Tatsuko: Yamato-kun, Yamato-kun, Yamato-kun, Yamato-kun, Yamato-kun...I'M COMING FOR YOOOOOOOOOU!!!'
Sequelitis: Some would argue that the original Majikoi is the only good one, but setting that aside, the A-4 fandisk is generally considered to be the weakest installment. It has less content than earlier releases, one heroine was rather minor, of little interest to most fans and had a short route. The second heroine, while popular and highly anticipated, had an overall disappointing route with wonky plot direction, romance and writing.