History YMMV / OneForAllAndEightForTheNinth

* SalvagedStory: A lot of people viewed Bakugo's ranking as a villain to be extremely ridiculous at the time, especially given that it was due to the author misunderstanding the ranking system at the time. He managed to salvage this by addressing it in the side story ''Unstable Compound''. [[spoiler:There, it is revealed that the excessive ranking was due to the HPSC's meddling to manipulate Bakugo into becoming another pawn for their schemes.]]

** During their encounter at the Mall, Izuku realizes that Shigaraki was Quirkless and All for One forcefully gave him Decay to manipulate him - which is revealed to be pretty much what happened in canon in Chapter 418.
*** Chapter 419 additionally reveals that [[spoiler: All for One masterminded every tragedy in Tenko's life, including his father's abuse.]]

** In this story, Yui is Mt. Lady's intern and she even helps the hero out by making shoes so she won't have to walk barefoot during a fight. Chapter 383 features Yui and Mt. Lady teaming up during her rematch against Gigantomachia.

* SalvagedStory:
** A lot of people viewed Bakugo's ranking as a villain to be extremely ridiculous at the time, especially given that it was due to the author misunderstanding the ranking system at the time. He managed to salvage this by addressing it in the side story ''Unstable Compound''. [[spoiler:There, it is revealed that the excessive ranking was due to the HPSC's meddling to manipulate Bakugo into becoming another pawn for their schemes.]]
** Another one is done for the issue of the Quirk Singularity in canon. In canon, the issue was brought up and was implied to be true with One For All's singularity being the example... and then nothing really came of it due to the story focusing more on the war with All For One and Tomura Shigaraki. In Eight for the Ninth, this is addressed as the theory only being ''partially correct'', and that the theory was based on when Quirks during Yoichi's time had either weak powers with (usually) little to no drawback, or immense power, [[PowerIncontinence but also immense drawbacks that people's bodies were ill-suited for at the time]] (Aoyama's Navel Laser is an example of a first-generation Quirk: great power, but no way to deal with the recoil so using it damages the intestines, or a way to reliably turn it off.) However, it's noted as being incorrect in the latter half, since essentially it was a scientific theory built on correct evidence ''at the time'', [[ScienceMarchesOn but came to an incorrect conclusion because it didn't factor in the possibility]] of the human body ''evolving and adapting'' better with Quirks as the generations passed.
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** In Chapter 58, while giving Destro his TheReasonYouSuckSpeech, Isamu mentions that one of the victims of the MLA terrorist campaign is Ryouji's sister, and made her daughter, a young girl with Quirk that allows her to make greese, an orphan. Chapter 410 of the manga reveals that All for One, in supreme act pettiness, tracked down and killed every single relative from the Second User's bloodline.

** [[spoiler:All For One’s plan to steal One For All from Izuku in Chap 42 is one delicious serving of a long overdue crow pie. Izuku punching a hole in AFO’s sails and ruined the gravitas of the scene when he called him “Mugen Shigaraki” was nice and all, but the real serving was when Mugen tried stealing One For All, only to find himself accosted by not only by Izuku, but the Vestiges of the Previous Torchbearers and Izuku’s girlfriends. Then Search’s Vestige suddenly escapes as soon as All For One used it, and once successful, dozens more make their bid for freedom. What Mugen Shiragaki couldn’t get back, they either were deleted by the range-capable Ennead and Torchbearers or absorbed into One For All, forcing Mugen Shigaraki into retreat. In just a few seconds, not only did All For One’s nose got ([[TheNoseless figuratively]]) bloodied, losing a total of ''34'' Quirks, he was reminded of his mortality once more. Even better, 11 of them went into One For All, highlights being [[InstantExpert Quirk Understanding]], [[HealingFactor the sole surviving Super Regeneration]] and '''Overhaul'''. And then, just to round it up, his secondary goal of wrecking All Might and his image is an absolute failure, since Eri healed All Might's grave injuries, Izuku gave him a new Quirk to replace One for All and All for One came out of the fight a quadriplegic.]]
** The Meta Liberation Army ends up on the receiving end of this [[spoiler: especially Re-Destro, who in an act of extreme arrogance, presumed to try to kill All Might and Inko out of the belief that harming them would not only cement his position as the new ruler of the Meta Liberation's world order, but also demoralize Izuku. It ends up horribly backfiring on him, as All Might's new combination Quirk from Izuku ends up meaning he's more than able to fight back...but what ends up being the cherry on top is ''Inko'' proceeding to rip him apart by yanking out his teeth with her enhanced "weak Quirk", squeezing Re-Destro's kidney, and then punching him in said kidney into unconsciousness. Rather than a triumph, Re-Destro gets absolutely humiliated on ''live television'' by a housewife with a "weak Quirk".]]
** Chapter 73 is filled with this from start to finish. [[spoiler:First, [[DirtyCop Slidin' Go]], who killed Nighteye (before he could warn everyone about the BadFuture down the line) is poisoned by Centipider's venom. He doesn't die, but is left in agonizing pain. Then we have Curious, who has been nothing but a immoral, condenscending SmugSnake ever since she was introduced, getting an incredible NoHoldsBarredBeatdown at the hands of Ochako before being left hanging on the top of the tallest building she could find, leaving Curious unable to escape before the police arrive, unless she is willing to fall to her death. And finally, All for One's death. His demise comes at the hand of Tomura, who already knew about his GrandTheftMe plan, and only waited for the right moment to get his payback, and then proceeds to destroy Mugen's consciousness, leaving the villain braindead in the real world before seizing control of All for One and all of its Quirks. An appropriate ending for a BigBadWannabe.]]
** Twofold during Chapter 74. [[spoiler:Tomura takes control of Mugen's brain-dead body and uses it to steal the Quirks of all MLA lieutenants that got captured in the previous. The smug, proud and arrogant Liberation warriors can do nothing but whimper and cry as Tomura turns them into the things they hate the most. Special mention goes to Curious, the last one to be left Quirkless, and has to hear how her precious Quirk is worthless and weak to her face right before Tomura kills her with it. After that, Tomura turns his sight to Garaki, and upon having the scientist hand him the control over the High Ends, Tomura proceeds to give him a taste of his medicine and shoves five Quirks at once into his body, turning him into homemade Nomu. A fitting punishment for a deranged mastermind.]]

** For those who feel that the manga constantly treated Bakugo with kid gloves, swept under the rug his more reprehensible actions, and gave him no small amount of CharacterShilling (a good chunk from Izuku himself), they greatly enjoy seeing Bakugo finally bitten by [[AdaptationalKarma karma: the teachers see him more like a potential villain than a hero, everybody in both class 1-A and 1-B hate his guts for his past as an unrepentant bully and his extremely aggressive and self-centered personality, and finally being expelled from UA and labeled a villain when he chose to disregard All Might's order and use a potentially lethal attack on Ochako]].

** Twofold during Chapter 74. [[spoiler:Tomura takes control of Mugen's braindead body and uses it to steal the Quirks of all MLA lieutenants that got captured in the previous. The smug, proud and arrogant Liberation warriors can't do nothing but wimper and cry as Tomura turns them into the things they hate the most. Special mention goes to Curious, the last one to be left Quirkless, and has to hear how her precious Quirk is worthless and weak to her face right before Tomura kills her with it. After that, Tomura turns his sight to Garaki, and upon having the scientist hand him the control over the High Ends, Tomura proceeds to give him a taste of his medicine and shoves five Quirks at once into his body, turning him into homemade Nomu. A fitting punishement for a deranged mastermind.]]

* MemeticLoser: Mugen Shigaraki, better known as All For One, has become a subject of mockery among readers. Unlike canon, almost all of his schemes fail, with several resulting in his enemies actually becoming ''stronger'' due to his actions[[spoiler:, such as Izuku stealing over a dozen quirks from him, or Monoma getting his own copy of All For One from Nine]]. He can't even manage to be intimidating, due to how thrown off he is when Izuku casually calls him by his real name. The Tea Spillers accomplish his goal of overthrowing hero society, something he'd been working towards for over a century, in only a few months. Worst of all, the link Mugen keeps between himself and One For All eventually results in [[spoiler:the Ennead and Vestiges wiping out roughly a ''third'' of his total quirks before he realizes what's happening]]. [[ArsonMurderAndJaywalking And his brother's ghost trolls him in Tartarus while Izuku's there]]. [[spoiler:And when he attempts to implement his plan to possess Tomura, he is instead surprised by Tomura turning the plan on him and killing him, but not before Mugen begs for his life twice.]]

** The President of the Hero Commission crossed it when she decided to brand anyone who gives the slightest support towards the Tea Spillers as a villain accomplice, for something as simple as ''commenting'' on their videos.

** Twofold during Chapter 74. [[spoiler:Tomura takes control of Mugen's braindead body and uses it to steal the Quirks of all MLA lieutenants that got captured in the previous. The smug, proud and arrogant Liberation warriors can't do nothing but wimper and cry as Tomura turns them into the things they hate the most. Special mention goes to Curious, the last one to be left Quirkless, and has to hear how her precious is worthless and weak to her face right before Tomura kills her with it. After that, Tomura turns his sight to Garaki, and upon having the scientist to hand him over the control over the High Ends, Tomura proceeds to give him a taste of his medicine and shoves five Quirks at once onto his brain, turning him into homemade Nomu. A fitting punishement for a deranged mastermind.]]

** Chapter 73 is filled with this from start to finish. [[spoiler:First, [[DirtyCop Slidin' Go]], who killed Nighteye (before he could warn everyone about the BadFuture down the line) is poisoned by Centipider's venom. He doesn't die, but is left in agonizing pain. Then we have Curious, who has been nothing but a immoral, condenscending SmugSnake ever since she was introduced, getting an incredible NoHoldsBarredBeatdown at the hands of Ochako before being left hanging on the top of the tallest building she could find, leaving Curious unable to escape before the police arrive, unless she is willing to fall to her death. And finally, All for One's death. His demise comes at the hand of Tomura, who already knew about his GrandTheftMe plan, and only waited for the right moment to get his payback, and then proceeds to destroy Mugen's conscience, leaving the villain braindead in the real world before seizing control of All for One and all of its Quirks. An appropriate ending for a BigBadWannabe.]]
* CompleteMonster: [[Characters/MyHeroAcademiaAllForOne All For One]], real name Mugen Shigaraki, enjoys tormenting people for little purpose other than the sick amusement he gets from it. His crimes include [[spoiler:forcing Decay on [[Characters/MyHeroAcademiaTomuraShigaraki Tenko Shimura]] so he'd kill his family]] and Mugen could act as an EvilMentor until he revealed Tenko's true identity to [[Characters/MyHeroAcademiaAllMight All Might]] just to cause the hero emotional trauma. He also deliberately gave [[spoiler:Yuga Aoyama]] a first-generation Quirk that had few built-in safeties, musing that it might well kill the recipient. Finally, it's revealed Mugen fully intended to give [[Characters/MyHeroAcademiaIzukuMidoriya Izuku Midoriya]] several Quirks that would enable him to survive almost anything, for the express purpose of prolonging Izuku's suffering as Himiko Toga's blood bag/body pillow.

** Hisashi is nicknamed "Red Dragon Emperor Hisashi", a reference to Ddraig, the character of same name from ''Literature/HighSchoolDXD'', due to his red hair and much like Ddraig's host, Issei, being CluelessChickMagnet surrounded by ladies in love with him.

** One of Chapter 73's most heartbreaking scenes is [[spoiler:Toga having a complete breakdown as she begs Izuku to take her back as part of the group, and Izuku crying as he tells her he can't, but that she would have been an amazing hero]]. Cut to the manga's Chapter 395, [[spoiler:and Toga dies from giving all her blood to Ochako to save her, while thinking that maybe, if someone had reached out to her before she became a villain, she could have been an amazing hero]].

** When renaming his quirk, Izuku decided upon the name Decade Force, partially to explain all the other quirks he can use and stated he could imply he has ten total abilities but some are secret. [[spoiler:After two different encounters with Mugen Shigaraki, Izuku has much more than merely ten quirks]].
*** [[spoiler:It gets funnier after chapter 65, when seven of All for One's Quirks manage to escape the pruning inside the Vestige Space and find their way inside One for All, giving Izuku a total of ''24'' Quirks: Six from the original users, eleven stolen during the Kamino arc and seven after the events of Nabu Island.]]
** The ShoutOut to ''WebAnimation/FinalFantasyVIIMachinabridged'' gets a funnier when you remember that Izuku's English VA Creator/JustinBriner voices Cloud in the online series.

* KarmicOverkill: Taking the canonical actions of Bakugo, and giving him a villain ranking is seen as this by a fair few, as it takes the idea that a jerk is worse than a villain to an extreme they see as laughably overwrought. [[spoiler:A side story addresses this and reveals that InUniverse, the HPSC are trying to manipulate Bakugo into becoming another Hawks and deliberately overstated his villain level to make working with them seem more appealing. Likewise, a later chapter in the main story has Bakugo write Izuku a letter about what the HPSC tried to do and warning him they might try something similar]].

* MemeticLoser: Mugen Shigaraki, better known as All For One, has become a subject of mockery among readers. Unlike canon, almost all of his schemes fail, with several resulting in his enemies actually becoming ''stronger'' due to his actions [[spoiler:such as Izuku stealing over a dozen quirks from him or Monoma getting his own copy of All For One from Nine]]. He can't even manage to be intimidating due to how thrown off he is when Izuku casually calls him by his real name. The Tea Spillers accomplish his goal of overthrowing hero society, something he'd been working towards for over a century, in only a few months. Worst of all, the link Mugen keeps between himself and One For All eventually results in [[spoiler:the Ennead and Vestiges wiping out roughly a ''third'' of his total quirks before he realizes what's happening]]. [[ArsonMurderAndJaywalking And his brother's ghost trolls him in Tartarus while Izuku's there]]. [[spoiler:And when he attempts to implement his plan to possess Tomura, he is instead surprised by Tomura turning the plan on him and killing him, but not before Mugen begs for his life twice.]]

** The President of the Hero Commission crossed it when she decided to brand as a villain accomplice anyone who gives the slightest support towards the Tea Spillers, for something as simple as ''commenting'' on their videos.
** The MLA, more specifically, Curious, crossed it during the beginning of the War arc, with the Valentine's Day Attack. [[spoiler:Curious used her Quirk on several dozens of MLA foot soldiers, turning them into bombs without their knowledge or consent, and sending them in suicidal bombings across the country. These soldiers were chosen mostly because their Quirks were weak and useless for the MLA cause.]]

** The inverse is the "SNAP!" of a bond breaking - though the only time it has happened to Izuku was when he sensed Toga's murderous love for him. The original holder of Bonding, however, has heard it way too many times.
* NeverLiveItDown: No matter what the story or author does about it later, discussion of the story by the critical will never avoid Bakugo's villain ranking coming up as an example of ridiculous levels of Bakugo bashing in other parts of the fandom.

** Another one is done for the issue of the Quirk Singularity in canon. In canon, the issue was brought up and was implied to be true with One For All's singularity being the example... and then nothing really came of it due to the story focusing more on the war with All For One and Tomura Shigaraki. In Eight for the Ninth, this is addressed as the theory only being ''partially correct'', and that the theory was based on when Quirks during Yoichi's time had either weak powers with (usually) little to no drawback, or immense power, [[PowerIncontinence but also immense drawbacks that people's bodies were ill-suited for at the time]] (Aoyama's Navel Laser is an example of a first generation Quirk, great power, but no way to deal with the recoil so using it damages the intestines, or a way to reliably turn it off.) However, it's noted as being incorrect in the latter half, since essentially it was a scientific theory built on correct evidence ''at the time'', [[ScienceMarchesOn but came to an incorrect conclusion because it didn't factor in the possibility]] of the human body ''evolving and adapting'' better with Quirks as the generations passed.

* MemeticLoser: Mugen Shigaraki, better known as All For One, has become a subject of mockery among readers. Unlike canon, almost all of his schemes fail, with several resulting in his enemies actually becoming ''stronger'' due to his actions [[spoiler:such as Izuku stealing nearly a dozen quirks from him or Monoma getting his own copy of All For One from Nine]]. He can't even manage to be intimidating due to how thrown off he is when Izuku casually calls him by his real name. The Tea Spillers accomplish his goal of overthrowing hero society, something he'd been working towards for over a century, in only a few months. Worst of all, the link Mugen keeps between himself and One For All eventually results in [[spoiler:the Ennead and Vestiges wiping out roughly a ''third'' of his total quirks before he realizes what's happening]]. [[ArsonMurderAndJaywalking And his brother's ghost trolls him in Tartarus while Izuku's there]]. [[spoiler:And when he attempts to implement his plan to possess Tomura, he is instead surprised by Tomura turning the plan on him and killing him, but not before Mugen begs for his life twice.]]

* MemeticLoser: Mugen Shigaraki, better known as All For One, has become a subject of mockery among readers. Unlike canon, almost all of his schemes fail, with several resulting in his enemies actually becoming ''stronger'' due to his actions [[spoiler:such as Izuku stealing nearly over a dozen quirks from him or Monoma getting his own copy of All For One from Nine]]. He can't even manage to be intimidating due to how thrown off he is when Izuku casually calls him by his real name. The Tea Spillers accomplish his goal of overthrowing hero society, something he'd been working towards for over a century, in only a few months. Worst of all, the link Mugen keeps between himself and One For All eventually results in [[spoiler:the Ennead and Vestiges wiping out roughly a ''third'' of his total quirks before he realizes what's happening]]. [[ArsonMurderAndJaywalking And his brother's ghost trolls him in Tartarus while Izuku's there]]. [[spoiler:And when he attempts to implement his plan to possess Tomura, he is instead surprised by Tomura turning the plan on him and killing him, but not before Mugen begs for his life twice.]]

* MemeticLoser: Mugen Shigaraki, better known as All For One, has become a subject of mockery among readers. Unlike canon, almost all of his schemes fail, with several resulting in his enemies actually becoming ''stronger'' due to his actions [[spoiler:such as Izuku stealing nearly over a dozen quirks from him or Monoma getting his own copy of All For One from Nine]]. He can't even manage to be intimidating due to how thrown off he is when Izuku casually calls him by his real name. The Tea Spillers accomplish his goal of overthrowing hero society, something he'd been working towards for over a century, in only a few months. Worst of all, the link Mugen keeps between himself and One For All eventually results in [[spoiler:the Ennead and Vestiges wiping out roughly a ''third'' of his total quirks before he realizes what's happening]]. [[ArsonMurderAndJaywalking And his brother's ghost trolls him in Tartarus while Izuku's there]].

** With ''Fanfic/IgnitedSpark''. The authors occasionally exchange ideas and praise each others works, and there are plenty of references to ''849'' on ''Ignited Spark''.

** Chapter 73 is filled with this from start to finish. [[spoiler:First, [[DirtyCop Slidin' Go]], who killed Nighteye (before he could warn everyone about the BadFuture down the line) is poisoned by Centipider's venom. He doesn't die, but is left with an agonizing pain from it. Then we have Curious, who has been nothing but a immoral, condenscending SmugSnake ever since she was introduced, getting an incredible NoHoldsBarredBeatdown at the hands of Ochako before being left hanging on the top of the tallest building she could find, leaving Curious unable to escape before unless she is willing to fall to her death. And finally, All for One's death. His demise comes at the hand of Tomura, who already knew about his GrandTheftMe plan, and only waited for the right moment to get his payback, and then proceeds to destroy Mugen's conscience, leaving the villain braindead in the real world before seizing control of All for One and all of its Quirks. An appropriate ending for a BigBadWannabe.]]
* CompleteMonster: [[Characters/MyHeroAcademiaAllForOne All For One]], real name Mugen Shigaraki, enjoys tormenting people for little purpose other than the sick amusement he gets from it. His crimes include [[spoiler:forcing Disintegrate on [[Characters/MyHeroAcademiaTomuraShigaraki Tenko Shimura]] so he'd kill his family]] and Mugen could act as an EvilMentor until he revealed Tenko's true identity to [[Characters/MyHeroAcademiaAllMight All Might]] just to cause the hero emotional trauma. He also deliberately gave [[spoiler:Yuga Aoyama]] a first-generation Quirk that had few built-in safeties, musing that it might well kill the recipient. Finally, it's revealed Mugen fully intended to give [[Characters/MyHeroAcademiaIzukuMidoriya Izuku Midoriya]] several Quirks that would enable him to survive almost anything, for the express purpose of prolonging Izuku's suffering as Himiko Toga's blood bag/body pillow.

** With ''Fanfic/WatashiNoHeroAcademia''. ''WNHA'' author Josie_Lynn cites ''849'' as one of the major influences to her work, and griffinguy24 mentions ''WNHA'' as one of his favorite fics.

** He is also a fan of ''Fanfic/BackToTheBeginning'' and ''Fanfic/ConstantsAndVariablesAliandris'' from Aliandris.

** He is on the same Discord server as Kairomaru, author of ''Fanfic/CollectorHeroSynthesis'', ''Fanfic/TheLogiaBrothers'' and ''Fanfic/MagmaDragonKing'', Primordial Vortex, author ''Fanfic/TheEmeraldPhoenix'', ''Fanfic/SupernovaOnePiece'' and ''Fanfic/LegendOfTheMonkeyGod'' and Aliandris, author of ''Fanfic/BackToTheBeginning'' and ''Fanfic/ConstantsAndVariablesAliandris''.

** He is on the same Discord server as Kairomaru, author of ''Fanfic/CollectorHeroSynthesis'', ''Fanfic/TheLogiaBrothers'' and ''Fanfic/MagmaDragonKing'' and Primordial Vortex, author ''Fanfic/TheEmeraldPhoenix'', ''Fanfic/SupernovaOnePiece'' and ''Fanfic/LegendOfTheMonkeyGod''.

* SugarWiki/MostWonderfulSound: All of Bonding's sound effects that occur when a bond is formed or levels up: Stage 1's "thump-thump-thump-CLICK", Stage 2's "DING!", Stage 3's "VWORP"...
** The increase to Stage 4 wasn't clearly heard, but the girls' best guess was a "mmmmm...MMMMM...POP!" before they all teleported to Izuku's side.