There are too many supporting characters in My Hero Academia so most fans can keep track of them, but those who have the most impact are the protagonists and antagonists. Each side tries to impose its vision of society on the other, but it is clear that most civilians would prefer to have the heroes in command, assuming they do not abuse their power, of course.
Interestingly, the characters you dislike the most are not necessarily villains. On the contrary, at least a couple of them are technically considered heroes. On the other hand, the fandom is less interested in a character’s personal affiliations than in the treatment of those around him, a relatively easy metric to measure when it comes to the selection of fan favorites.
Manga spoilers below
My Hero Academia: The 10 Healthiest Characters, Ranked
My Hero Academia: the 10 most topical characters, ranked
10 Tomura needs to come out from under All For One’s thumb
Tomura begins his arc with a groan rather than a bang, incurring losses against All Might and Overhaul. Finally, you are granted a power beyond your imagination when All For One is “grafted” onto your consciousness.
At this point, Tomura begins to realize that his “master” does nothing more than use him as a puppet with a young body, which explains why the public is somewhat more receptive to his backstory than before. However, until he gets out of the clutches of All For One, Tomura is going to be despised by the fandom.
9 Monoma’s obnoxiously pretentious behavior tires very quickly
Neito Monoma does not have a single villain bone in his body, but he is still hated by fans due to his overwhelmingly hateful behavior in Class 1-A.
He takes every opportunity he gets to rub the achievements of Class 1-B in their faces, exaggerating the supposed superiority of Class 1-B with annoyingly pretentious tones and expressions. At least his friends are able to tolerate his dramatic hyperbole for more than ten seconds straight.
8 Re-Destro resorts to torture and murder just to prove his twisted points
Re-Destro presents himself as a man sure of his identity, but the mask of composure falls off his face when he is “stressed”. Although he advocates greater freedom for Quirk holders, he uses abominable methods to achieve his goals.
Re-Destro is known for his unpredictable violence, resorting to torture and murder to prove his twisted points. His character is so disgusting that audiences really support Tomura during his battle with Re-Destro.
7 Garaki’s actions cause more destruction than most other villains
Dr. Kyudai Garaki’s Life Force has allowed him to live a much longer life than most. It’s an amazing Quirk that he then copies and delivers to All For One.
In addition to supporting the League of Villains behind the scenes, Garaki is responsible for Tomura Shigaraki’s evolution into becoming every Pro Hero’s nightmare, not to mention the countless Nomus he has cooking in his lab. This villain is not that strong, but his actions are responsible for more destruction than most of his peers.
6 Wolfram throws everyone, including his allies, under the bus
Wolfram is unable to differentiate between his personality and his ambition, which means that he is the last person to show concern for anyone, including his allies.
You want to get rich more than anything else, and you will destroy everything (and everyone) if you obstruct your path to wealth. Wolfram is also exceptionally arrogant, given that he defies both Deku and All Might, but in the end he is no match for their Combined Double Detroit Smash.
5 Dabi is willing to destroy his entire family in order to get revenge on Endeavor
Dabi’s past is certainly heartbreaking, but that doesn’t excuse him from inflicting his emotional wounds on the rest of his family. His hostility towards Enji is justifiable, but it is so intense that Shoto and Natsuo Todoroki are caught in the crossfire.
Dabi intentionally puts his little brothers in danger to get revenge on their father (who at this point just wants a reconciliation). On a minor note, Dabi’s belligerent attitude tends to rub people the wrong way, be they heroes or villains.
4 Muscular does not understand the basic concept of redemption
Muscular is unnecessarily brutal, even for a villain, reveling in the possibility of murdering a young child (especially one orphaned because of him).
There are no ideological principles to guide your actions and no conscience to hold you back, which is exactly why All For One enlisted you in the first place. Muscular does not understand the basic concept of redemption, which makes him one of the most obnoxious characters in My Hero Academia.
3 Eri’s treatment is completely unforgivable
In Overhaul’s bloated fantasies, the ideal world is one devoid of the Quirk factor, and you’re not the only person who believes that the Quirks pose grave danger in the near future.
He proceeds to subject a defenseless girl to endless torture sessions, disassembling and reassembling her fragile body over and over again until she surrenders to her suffering. It can be argued that everything else Overhaul does, every act of violence and atrocity, is insignificant in the face of his crimes against Eri.
2 All For One just wants to be the best baddie in the history of the world
The sky’s the limit when it comes to All For One’s turbulent malevolence. This particular species of villain is rare in shonen anime, let alone My Hero Academia.
Most of the antagonists offer arguments and justifications in support of their motivations, even if they are sadly delusional, but All For One just wants to be the best baddie ever. In fact, fans hate him so much that they were overjoyed when Estrella and Raya wiped the disgusting smile from All For One’s face.
1 Mineta gives up the very notion of good judgment in favor of her hormones
Mineta Minoru is obviously a satirical representation of adolescence. Although not many teenagers follow such a depraved path through puberty, Mineta forgoes the very notion of good judgment in favor of her hormonal drives.
His desire for feminine attention leads him to engage in dozens of creepy activities, like peeking into the girls’ locker room and smelling their underwear drawers. However, his dirtiest line is the one he says to Eri after meeting her for the first time: “I can’t wait to see what you look like in ten years.” It is impossible to imagine how someone like Mineta has survived the expulsion for so long.