YMMV / One for All and Eight for the Ninth

• Adorkable: Yoichi Shigaraki. From his Fountain of Memes sense of humor to his sassy behavior, he definitely gives Izuku a ride for his money on the matter of being the biggest dork in the story.
• Americans Hate Tingle: In-Universe, many Texans claim All Might is in league with the devil because his hero name implies he's all-powerful and only God is all-powerful.
• Anvilicious: Chapter 69 rather unsubtly tells readers to get involved in politics and that trying to stay away from them will only make things worse in the long term.
• Catharsis Factor:
  • 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 Character Shilling (a good chunk from Izuku himself), they greatly enjoy seeing Bakugo finally bitten by 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. The same applies to Mineta and his perversions.
  • 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 (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 Quirk Understanding, the sole surviving Super Regeneration and Overhaul. And then, 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 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 humiliated on live television by a housewife with a "weak Quirk".
  • Chapter 73 is filled with this from start to finish. First, Slidin' Go, who killed Nighteye (before he could warn everyone about the Bad Future 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 an immoral, condescending Smug Snake ever since she was introduced, getting an incredible No-Holds-Barred Beatdown 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 Grand Theft Me 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 Big Bad Wannabe.
  • Twofold during Chapter 74. 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 chapter. 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 she 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 control over the High Ends, Tomura gives 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.
• Complete Monster: 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 forcing Decay on Tenko Shimura so he'd kill his family and Mugen could act as an Evil Mentor until he revealed Tenko's true identity to All Might, just to cause the hero emotional trauma. He also deliberately gave 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 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.
• Escapist Character: Izuku, like you wouldn't believe.
  • He learns how to use his Quirk without running into the canon problems of broken bones much earlier, which quickly turns him into The Ace.
  • His childhood bully receives karmic punishment for all the past abuse he inflicted on Izuku, while Izuku becomes the most popular guy in his class.
  • He catches the attention of many pretty girls, all of whom he ends up dating and forming psychic links with.
  • Finally, he ends up easily winning the UA Sports Festival, becoming a celebrity in the process.
• Fan Nickname:
  • A common abbreviation for the story is 849, which evolved to the AU being called the "849 Universe" once Unstable Compound was started.
  • Hisashi has been nicknamed "Red Dragon Emperor Hisashi", a reference to Ddraig, the character of same name from High School D×D, due to his red hair and much like Ddraig's host, Issei, being a Clueless Chick-Magnet surrounded by ladies in love with him.
  • Since she doesn't have a name in either canon or the story, the HPSC President is nicknamed "President Alpha Bitch."
• Friendly Fandoms:
  • With Ignited Spark. The authors occasionally exchange ideas and praise each others' works, and there are plenty of references to 849 on Ignited Spark.
  • With Watashi no Hero Academia! and My Hero Academia: Mechanical green. WNHA author Josie_Lynn, and MA:MG author META2012 both cite 849 as one of the major influences to their works, and griffinguy24 mentions WNHA as one of his favorite fics.
  • He is on the same Discord server as Kairomaru, author of Collector Hero: Synthesis, The Logia Brothers and Magma Dragon King and Primordial Vortex, author The Emerald Phoenix, Supernova (One Piece) and Legend of the Monkey God.
  • With DeusVerve. DeusVerse is a fan of 849 and griffinguy24 cites their works as an inspiration to start writing.
  • He is also a fan of Back to the Beginning and Constants And Variables from Aliandris.
• Harsher in Hindsight:
  • One of Chapter 73's most heartbreaking scenes is 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, where 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.
  • In Chapter 58, while giving Destro his "The Reason You Suck" Speech, 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 grease, 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.
  • 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 All for One masterminded every tragedy in Tenko's life, including his father's abuse.
• Heartwarming in Hindsight: Chapter 53 features a rather sweet moment between Eri and Kyoka, with the punk girl teaching Eri on how to play the drums. In Chapter 420 of the manga, Eri tells to Aizawa she wishes to become a singer just like Kyoka when she grows up.
• Hilarious in Hindsight:
  • 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. After two different encounters with Mugen Shigaraki, Izuku has much more than merely ten quirks.
    • 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 Shout-Out to Final Fantasy VII: Machinabridged gets even funnier when you remember that Izuku's English VA Justin Briner voices Cloud in the online series.
  • Amongst the Quirks gained during chapter 65 is Muscular's Muscle Augmentation. This chapter was posted three days after episode 132, featuring the villain's Curb-Stomp Battle against Izuku during the Dark Hero arc, was animated.
  • 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. Even funnier after Chapter 77, which features both Yui and her mentor taking on the colossal villain.
  • All for One's death back in chapter 74. In 849, Mugen is out-gambitted by Tomura, has his consciousness destroyed and his body blown to pieces during the Tartarus breakout. Come Chapter 410 of the manga, All for One meets his end via Death By De Aging, rewound out of existance after failling to take Tomura's body by force and true to his manchild nature, dies as toddler throwing a tantrum before vanishing forever. Both are karmic and appropriated ends for the Big Bad Wannabe.
• I Knew It!: There was a lot of people in the comments calling that one of Izuku's bonded was going to be Melissa well before it happened.
• Karmic Overkill: 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. A side story addresses this and reveals that In-Universe, the HPSC are trying to manipulate Bakugo into becoming another Hawks and deliberately overinflated 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.
• Memetic Badass: Izuku and the Ennead as whole are both a meta and In-Universe example of it, not only by the fact they are all incredibly powerful, but also skilled enough to take on some of the worst villains.
• Memetic Loser: Mugen Shigaraki, better known as All For One, has become a subject of mockery among readers. Unlike canon, all of his schemes fail, with several resulting in his enemies actually becoming stronger due to his actions, 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 the Ennead and Vestiges wiping out roughly a third of his total quirks before he realizes what's happening. And his brother's ghost trolls him in Tartarus while Izuku's there. 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.
• Moral Event Horizon:
  • 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, even 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. 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's cause.
• Most Wonderful Sound: All of Bonding's sound effects that occur when a bond is formed or levels up: Level 1's "thump-thump-thump-CLICK", Level 2's "DING!", Level 3's "VWORP"...
  • The increase to Level 4 wasn't clearly heard, but the girls' best guess was a "mmmmm...MMMMM...POP!" before they all teleported to Izuku's side.
  • 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, heard it way too many times.
• Never Live It Down: No matter what the story or author does about it later, discussion of the story by the critics will never avoid Bakugo's villain ranking coming up as an example of ridiculous levels of Bakugo-bashing in other parts of the fandom.
• Salvaged Story: 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. 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.