@dirt:
I'm going to chalk it up to an error. If it's from a databook, it might not have all been checked properly by the guy, and thus the mistake, or there's always the thought that "hey, I didn't fucking know that. Why should the author have to know that?" (Besides, well, you should make sure just in case.) Japan is into blood types because of weird stereotypes they made up, but are they so into it that they know how the blood types are passed on?
Also scientific accuracy in my shounen manga about teenage super heroes in training? Pshaw.
@SomeRandomGuy:
This is the kind of thing that bothers me in the communities of fantasy media: Selective suspension of disbelief.
People are more than willing to accept crazy scientifical nonsense like superpowers, but the moment that some trival detail like blood types doesn't realistically line up they call foul on the series. Superman can fly around and shoot laser out of his ass, but the moment he catches a helicopter by the strut that's when people start getting out the torches and pitchforks.
@Wagomu:
It's a problem when series call attention to it. I don't think it does here, so it doesn't bother me, but I think that it is absolutely a valid complaint elsewhere.
It goes along with the uncanny valley effect. It is easier for us to accept something completely foreign than something that's close to real, but off in some small ways. If a series says that everything is magic, then that's easy to accept. When it says that something's scientific, but the science is wrong, then we have a problem. It's why a few of us were getting bothered by Hagakure's refraction bit some pages back.
I agree with what you guys are saying about suspension of disbelief. It's a young boys manga focused on superheroes with advanced tech in a contemporary society. It's obviously going to take more than a few creative liberties from reality lol, and lots of series like this just tend to borrow general scientific concepts that sound cool for an ability, locale, or status while either changing it up or sticking to a superficially mainstream definition/application. I get that, and I've always loved it. Like Wagomu clarified, inconsistencies should only be brought up as an issue when the story itself is calling attention to a specific concept, especially one with traits that are common knowledge. Otherwise, you're just being nitpicky and looking way too hard into a fictional series for the sake of it.
But the thing is that this topic is kind of getting attention called to it. Yes, blood type inheritance specifically hasn't been referenced or appeared in the plot yet. But genetic inheritance in and of itself has been a huge theme of this series when it comes to Quirks. From the very first chapter of Midoriya stating that all lives are not born equal, with Horikoshi working in neat sci-fi details about how most of the population in this unspecified future have Quirks. How one's Quirk is either passed down from of the parents or a composite of both parental abilities. He even specifies how doctors can tell if a child is Quirkless by checking if they have an extra joint in the pinky toe, whereas those with Quirks have adapted to not have unnecessary body parts. And when Todoroki's backstory is pulled into the mix during the Sports Festival, we learn about the concept of Quirk Marriages that are formed for the sole purpose of enhancing specific Quirks to be passed down to latter generations. Yes, this is about superpowers and it's obviously not scientifically accurate, but it's still pulling from general concepts of genetic inheritance as a consistent theme. I think it goes without saying that consistent themes should have consistency in how they are depicted in the world of a series, and that we should find it weird if Bakugou's parents had Quirks based on, I don't know, wood and telepathy instead of explosions.
But of course, that's just the inheritance of superpowers. That has little to do with the idea of blood types, right? I would agree with that… if it wasn't for the fact that one of the Quirks showcased in the series is Bloodcurdle. The ability to incapacitate multiple people by ingesting their blood, the duration varying on which blood type you have. And it's not like Horikoshi gave this to a random background character or underling obstacle, the Quirk belongs to Stain. A main arc antagonist. Whose controversial philosophical ramifications have played huge roles in the story's events and character interaction. Who will most likely return to the story in some form or another due to the quick close-up of him being in a prison call adjacent to All for One. For such a big character, Horikoshi obviously put some decent degree of consideration in determining what his Quirk should be and looking a bit into science to at least know one two basic things about blood typing. Literally the most basic things to know about blood typing is how blood can be exchanged and accepted (which has already been shown in-depth in another fellow Shonen Jump series, One Piece), and how it's passed onto a kid. This isn't even going into slight more complex stuff like Rh or blood classification of other species. It's basic human knowledge, as evidenced by how AL noted of how Japan is into blood types.
But it doesn't even end there. Because of ALL the characters that could have had this hereditary blood type mismatching situation, it's with Todoroki. The character whose characterization and development is entirely centric around being compared to his father in powers and behavior, being born solely due to his father wanting to vicariously live through his success to the top, inhibiting his powers for the sake of not wanting to rely on a "borrowed" power from the man he hates, having a scar from his own mentally ill mother being reminded of said father, etc. If there was one character to not screw up on while everybody can get by due to parental lineage not being a huge theme, it was Todoroki. Thus, if we are to truly believe that Todoroki has such a strained relationship with his father and struggling being perceived as being similar to his father, there should be some general genetic consistency.
The topic of Hagakure's refraction and its scientific accuracy can be excused due to being such a one-note character and her Quirk not drawing much attention plot-wise at all. Todoroki has become one of the main student characters of the series alongside Izuku, Bakugou, Uraraka, and Iida. His powers of having both fire and ice are actually given focus to be a big special deal, both in how powerful they are as well as being the only character thus far in the series (besides All for One) to naturally have two Quirks in general. His whole character, as I've already summarized, is focused around the burden of being made and valued only for carrying on a specific powerful ability. Which fits into genetic inheritance. And we know that Horikoshi has utilized the concept of blood typing as, not just accessory character info, but an actual relevant in-story element for a whole major antagonist fight.
I'm sorry, but is it REALLY that much of a stretch to think that showcasing both genetic inheritance and blood typing means that you should expect some consistency with blood typing inheritance? Literally a combination of not just both of those concepts, but those words? And don't act like Horikoshi doesn't ever take scientific inspiration in general for his characters, because various dialogue and volume info shows that he love implementing nuanced scientific concepts. Like Iida's gear specifically being designed to counter wind resistance and cool his engines. The palms of Mineta's gloves being coated with the same adhesive secretion from his scalp that prevents his balls from sticking to his hands. Uraraka's equipment alleviating her gravitation Quirk's nausea effects by reducing semicircular canal stimulation and stimulating pressure points (which is explicitly compared to a blood pressure gauge). Not to mention details like how Bakugou's explosions are ignited from nitroglycerin sweat or how Quirks like hydrokinesis can be revealed as water vapor manipulation. Give Horikoshi some credit for how much of an absolute nerd he is with such unnecessary and fitting scientific knowledge lol.
Blood type inheritance is a pretty simple scientific fact. It's literally just mixing and matching letters based on parentage lol, hardly a difficult concept to grasp. You guys are acting like I'm going off the deep end of, say, calculating Midoriya's super-strength accuracy to the laws of physics or criticizing Yaoyozoru's molecular structuring Creation quirk with an in-depth chemistry analysis. This isn't anything complex in the slightest and can mostly be summed up in a 4x4 table graph like the one I posted earlier in the thread. This is an early high school or even middle school lesson. A scientific equivalent to rock-paper-scissors logic-wise with letters. If this is all just a typo due to the Ultra Archive book's writing getting outsourced to somebody else, that's completely understandable. But if Horikoshi himself approved of that, then no, I'm not excusing such a simple mistake when he should obviously know better considering all of this. He totally could have blanked out and made a mistake, but I expect better when he literally chose the only near-imspossible blood type hereditary pairing. XD
@desa:
Flame-Beard has to be I&F's dad. Between the quirk marriage, the scar and the way he is questioning how to manage his heritage, it's actually necessary. If it was another maybe they could be something there but having I&F have another dad is one of the worst choice the author could make for his character.
I completely agree with you. I actually hope I'm wrong. I hope this is just a typo and a situation similar to silly info like, I don't know