How does Midoriya feel about Bakugo? Some interpret it as if he doesn't hold a grudge towards his former bully, but doesn't really like him. Others perceive their relationship as Midoriya hating Bakugo wholeheartedly but respecting him enough to control that hatred. The biggest camp, however, seems to believe that Midoriya still sees Bakugo as the friend he used to be during their childhood years, and wants to foster a healthier relationship between the two of them in the present. More cynical viewers/readers believe that Midoriya is suffering from a form of Stockholm Syndrome, given how it sometimes seems like he excuses Bakugo's actions.
How does Midoriya really feel about Uraraka? In the beginning, he seemed to be a bit of a Covert Pervert, given his tendency to blow any positive interactions with her out of proportion, as young boys do. As the series goes on, his feelings for her are rarely mentioned explicitly, while the narrative focused much more on her developing feelings for him (which she attempts to put aside for now and enjoy their friendship). On the other hand, the two tend to blush around each other, and he still gets flustered around her (like when she called his cellphone and when she went into his dorm room), while their classmates, Mina especially, seem to have picked up on their chemistry and how well the two support each other.
Bakugo:
Bakugo's reaction to finding out about Endeavor's actions. Was he just horrified at what he learned on the surface about Todoroki's home life? Or was he horrified at the possibility of becoming like Endeavor with his own desire for being number 1? Or is it a combination of both?
Bakugo refusing to let Midoriya rescue him during the Forest Training Camp Arc. Was that Bakugo prioritizing his ego even in such a dire situation and refusing his rival's help or was it him realizing that Midoriya would probably die in the process and trying to stop him from doing it? Or both?
How much of Shoto's story about his father is reliable? He says that Endeavor only married his mother for her Quirk and to produce offspring, but some calculations imply that he was as young as 19-21 when his first son was born. Was he already obsessed with overcoming All Might so early on his life and career(as he says, he became the #2 Hero at 20, and realized he couldn't surpass All Might) or did he marry and have his first kid out of love and desire to start a family, only later having this desire twisted? Is Shoto telling a reliable story about his family, or is his grudge against his father coloring that story, especially considering that his oldest brother would be anywhere from 9-12 when Shoto was just born? Two Heroes reveals that All Might spent his early hero years in America. Assuming they're the same age, this means Endeavor probably didn't actually compete against All Might until at least his first two children were born.
All For One gets this a lot:
Was All For One always evil, or did he use to be good in the past and eventually pulled a Face–Heel Turn due to the trauma of losing his family and living in a chaotic world where people like him were discriminated against for having quirks and possibly even more? It was mentioned that he ruled over Japan in the past like a tyrant. Was he doing it For the Evulz, did he not realize his actions were destructive, or was he convinced that Utopia Justifies the Means? Are his present motivations really purely selfish, or does he want to make sacrifices for the greater good? Not helping is the fact that while Yoichi mentioned his brother doing evil deeds as an adult, he never mentions his brother acting evil or seeming completely uncaring towards others as a child.
Whether All For One's relationship with Shigaraki is genuine or just manipulative (or even both) is still debated. The Reveal in Chapter 92 that Shigaraki is in fact the grandson of All Might's mentor doesn't help matters. Later chapters during Paranormal Liberation War Arc heavily implied it to only be manipulative, with All For One possessing Tomura’s body against his will and implying he literally wants Tomura to be “the next me” by fully controlling his body. However, even after gaining full, definitive control over Tomura’s body, All For One still continues to insist he is not just a “mere pawn” and is someone very important to him and assures Spinner he has the utmost need respect for Tomura’s will, which could just be All For One being manipulative again or being genuine in his statements. Then comes The Reveal at chapter 350. Turns out, while Tenko/Tomura is the primary choice for All for One's replacement body, he is not the only "candidate." Turns out, he and Doctor Garaki were "managing" a secret facility with dozens of kids to serve as possible successors in case Tomura fails somehow. Toya Todoroki/Dabi was one of them.
Did All For One really find Tenko/Tomura by chance, or did he instigate the events that led to it? Considering that All For One has the power to bestow Quirks on people, it's possible that he somehow found out about Tenko being Nana Shimura's grandson, then gave the previously Quirkless Tenko the Decay Quirk, thereby causing the tragedy that killed the Shimura family. It could also be that he simply spied on him until the latter became homeless.
Does All For One truly love his brother, or does he see him like purely an extension of himself and as a tool he needs to control? Not helping is the fact that he spared his brother while he kills people by the thousands.
Additionally, does All For One truly see his subordinates as mere pawns, or does he genuinely care about them to some extent at least. In the past, he granted the wishes of desperate people in return for favors and kept his promise so to them but then according to his younger brother "disposed of them". Did All For One not care about them, or did he see it as an equivalent exchange and "disposing" of them as not being a bad thing. Did those people even suffer? Did he even truly "dispose" of them? Not helped by the fact that during his fight with All Might, he bitterly recalls how the latters fist took down one after one of his followers and states the up-high view must have been nice standing atop their sacrifices. Chapter 350 reveals that All for One has a secret network to "keep tabs" on kids with troubled and dangerous backstories, so they can serve as League recruits, or possible vessels for the villain to transfer his Quirk and conscience.
Was Best Jeanist's mentoring of Bakugo an attempt to correct the flaws in a talented but troubled young hero, or was he simply pushing his values on Bakugo? Or perhaps some combination of the two?
Mitsuki hitting her son in the head: is it just a gag and the only way she can make her hot-headed son listen to her or a sign of abuse and the reason why Bakugo is so angry and prone to violence in the first place? Bakugo claims that using violence to keep people in line was "how (he) was raised," which might lend credence to the idea that Mitsuki's discipline methods rubbed off on him, although it is possible that Mitsuki only used corporeal punishment when Bakugo started getting out of control.
Fuyumi's determination to try fix up her family. Has she truly forgiven her father for his previous behavior by noticing that Endeavor is trying to atone for his mistakes and be a better person? Or is she simply trying to bury the hatchet as fast as she can and ignoring her own feelings so she can have the family she wanted?
After Eri accidentally killed her father, her mother disowned her, called her a cursed child, and gave her up to the yakuza. However, the Season 4 ending shows that Eri's childhood before the incident was a happy and, seemingly, loving one, even including an image of a baby Eri being held tenderly by her mother. Although it doesn't excuse her actions, could Eri's mother disowning her have been a Moment of Weakness, similar to the incident in Todoroki's childhood when his mother burned him despite being a loving parent before?
Was a young Gentle's ill-fated attempt to help the falling worker more motivated by a desire to be a hero or to get attention? More specifically, there's his decision in the manga to use his Quirk to create a trampoline to reach the man, rather than to cushion his fall. Was that a mistake made in the heat of the moment, not to mention possibly due to inexperience with his Quirk, or was it because Gentle wanted to be seen saving the man? It's worth noting that in the anime, he tries to cushion the man's fall, but the outcome remains the same, suggesting that it may have been intended to be seen as a case of making a mistake during the heat of the moment, but even that still leaves it open for interpretation.
When you consider that Aizawa re-enrolled the students he expelled, what does that say about his claim that he'd have expelled both the students who went to save Bakugo and the students who didn't do anything about the first group if not for All Might's retirement? Did he honestly mean it, or was this another rational deception to get the students to behave themselves and apply themselves to their studies in order to become model heroes?
Did Mt. Lady undergo some serious Character Development offscreen that led to her becoming a truly selfless hero instead of a glory hound, or was she always like that? While teaming up with Kamui and Edgeshot clearly had a positive effect on her (at least popularity-wise) she never actually stops her flirtatious or showboating behavior. This does not stop her from putting her body on the line to save Bakugo or stop Gigantomachia. It's entirely likely that she's just a multifaceted character who puts on a show but knows when to get serious.
Are the first OFA users really ideal heroes? While they do seem to be good people, there is still relatively little information about them and they did not appear on-screen often. Are they really as fair as they seem, or do they seem like this because we only heard their side of the story? Some viewers theorize the first few may even be (part) to blame why AFO is evil, in the sense that they probably blamed him for something he didn't do, or called him inherently evil without evidence. Some even suspect that part of the OFA might be outright evil. Not helping is the presence of other heroes that have done unforgivable things like Endeavour if not outright malicious. The hero system also turned out to be very corrupt.
Yoichi in particular is probably the most debated out of all the OFA users. In a flashback, he accused his brother of thinking the villain of a comic won, when in fact it turns out AFO knew from the start the villain will lose and therefore didn't read the comic. While AFO as a character is debated, this doesn't change the fact that Yoichi gave a very wrong piece of information, which makes some viewers suspicious about him. Is Yoichi really an Ideal Hero with Creepy Good moments, is he a more flawed than acceptable, but ultimately a good person, or even secretly evil, his creepy moments being his mask slipping, his wrong statement being a lie meant to demonize his brother and his secretive nature due to him trying to hide his own evil deeds?
