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My Heroes Reborn (AO3 Link) is a Massive Multiplayer Crossover Fan Fiction by Emma Iveli. Primarily set in My Hero Academia, it's a For Want of a Nail fic where another villain is present at the USJ and awakens the most recent past life of five of the students, each from various franchises/series: One Piece, Naruto, Fairy Tail, Ranma ½, and My Little Pony: Friendship Is Magic. The story depicts the students trying to navigate their lives with another life's memories and skills in their heads.

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Official Summary: AU Multi-Cross. During the USJ Incident, five students run afoul of a villain's quirk. Forced to remember their most recent past lives they must pull themselves together to become heroes. With new skills and memories can they become the heroes they're meant to be? Or will their newly acquired baggage drag them down?

Tropes:

  • Accidental Pun: When Hibiki shows up after the fight with Stain, Aiko tells Izuku, Toru and Mashirao "It's time to face the music" it was clear it was unintentional as she immediately lampshades it with "Oh... lucky pun!"
  • Achievements in Ignorance: Mashirao wins second place in the obstacle race by getting lost. He also managed to do it without leaving the track, thus preventing disqualification.
  • Actually Pretty Funny: Two heroes in their past lives died due to dumb decisions, however they took it in stride and they share their stories as they found the deaths darkly funny in hindsight.
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  • Adaptation Relationship Overhaul: Izuku reveals that not only did Sanji and Pudding get married, but also that Luffy married Hancock, and Usopp married Kaya, with Hancock and Kaya also joining the Straw Hats.
  • Adaptational Badass:
    • All five of the students are much more competent than their canon incarnations due to the abilities they gained from their past lives. This especially applies to Izuku, who has all of Sanji's abilities due to all of them being completely physical (including Haki, which just requires materializing willpower). Katsuki later joins the group after his own Past-Life Memories are awakened, making him generally on the same level with Izuku in overall strength.
    • Class 1-A in general is stronger than they are in canon because they have much higher standards to aspire to thanks to their classmates. It shows during the Provisional License Exam, where all of them manage to pass the first part of the exam easily.
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    • The Big Three join the group after their own Past-Life Memories are awakened, giving them access to years of battle experience. Mirio in particular is on the same level as Izuku and Katsuki, and a strong contender for the World's Strongest Man.
  • Adaptational Nice Guy: Katsuki has his Jerkass Realization and starts his road to redemption much earlier than he did in canon. He also completes it faster too, thanks to receiving his Past-Life Memories as Zoro.
  • Adult Fear:
    • Sanji never had kids because his wife, Charlotte Pudding, was terrified of being a terrible parent like her own mother, Big Mom.
    • Mashirao's poor sense of direction is played realistically here, with Hibiki going as far as to put a tracker on him so his friends and authority figures can find him when he inevitably gets lost.
  • Adults Are Useless: Usually averted, except in one noticeable instance. The hero Mashirao was supposed to intern with lost the tracker and transceiver Hibiki sent him in the mail, and was too embarrassed about it to tell him. This caused Mashirao to never make it to that hero's agency, leaving him to wander Japan by his lonesome for three whole days, which led to him showing up in Hosu and taking part in the confrontation with Stain. Understandably, Hibiki is furious when he finds out, gives that hero the Silent Treatment for the next several months while salvaging Mashirao's internship by having him intern with Hibiki instead.
  • Answer Cut: When Izuku and All Might are talking about Izuku's problems, Izuku states that Mashirao has it worse than him. All Might asks "What's wrong with him?", and it immediately cuts to Ochako, Momo, Toru and Tenya freaking out over how they lost him despite traveling together in a group.
  • Armor-Piercing Response: After the Sports Festival, Toru gives one to Bakugo after a rant.
    Bakugo: Look I don't care if he's hiding something from me! I don't care that he knows he has to tell me what's really going on! I don't care if he had a crappy life and a crappy dad in his past life! I don't care if he knows what it's like to die! I don't care about him!
    Toru: It sounds like you do care...
  • Ascended Extra: Toru and Mashirao are supporting characters in the manga who rarely have A Day in the Limelight like other supporting characters such as Momo. Here, because they're Incarnates, they're main characters and close friends with Izuku.
  • Batman Gambit: Izuku's plan during the Cavalry Battle. He and his team collect as many headbands as possible, then when time is close to running out, allow either Katsuki or Shouto to steal the ten million headband, thus causing all the teams to target them instead while they just wait for time to run out. It works perfectly; so much so that, even though Katsuki's team officially won, everyone regards Izuku and his team as the real winners.
  • Benevolent A.I.: Hibiki's AI assistant Aiko, while she is sassy, snarky and often makes fun of everyone, she is firmly on the side of good, and is genuinely apologetic when Bakugo's bullying comes out thanks to her meme.
  • Beyond the Impossible:
    • The fact that the One Piece world makes no sense whatsoever is repeatedly lampshaded.
    • Ditto for Toru's Hammerspace party powers.
    • Mashirao's sense of direction. It's so bad that it's considered a legitimate handicap in the Obstacle Race, because he'll get disqualified if he goes off the track. Then he managed to get so lost that he won second place.
  • Blazing Inferno Hellfire Sauce: The cupcakes that Toru makes for Katsuki are this. Katsuki claims that it's not that spicy, but judging by Momo's reaction when she didn't have a choice but to eat them and Kaminari, Kirishima, Mina, Yuzu and Dark Shadow's reactions when they all engage an eating contest using the cupcakes it shows that it really is that spicy.
  • Blessed with Suck: While the UA students got their past lives' various skills, they also got their personality traits and habits, such as Ryoga's No Sense of Direction and Sanji's chain-smoking. Also, to reincarnate means you have to die, and that means all of them remember their deaths.
  • Bread, Eggs, Milk, Squick: Izuku gives Todoroki a speech about how he used the raid suit his father gave him. However something slips out..
    Izuku: I used the suit to fight for my crew! To fight for me! And to peep on women in the bathhouse!
  • Brick Joke:
    • In chapter 1 it's mentioned that Toru put a party hat on Shoto. When he shows up again in chapter 3, he's still wearing it and takes it off when Denki points it out.
    • In chapter 6, Toru pulls out the party cannon. Afterwards Momo, Ochako and Izuku explain their past lives to the class and Aizawa announces the sports festival, when he dismisses class he says "Also Hagakure! Please put away the cannon."
  • Bullying a Dragon: After watching the reassessment videos, Tetsutetsu tries to challenge Katsuki to a spar so he can see how his Quirk can measure up to the latter's swords. Both Kendo and Kirishima shoot it down immediately, with the latter, who is usually as much of a Challenge Seeker as Tetsutetsu, flatly telling him that he does not want to do that.
  • But for Me, It Was Tuesday: Deconstructed. Bakugo honestly forgot he suicide baited Izuku. This actually causes a Heel Realization when he's horrified that it's something he could forget.
  • Call-Back: After learning that Mirio is a fellow One Piece reincarnation, and may possibly one of a former enemy, Izuku and Katsuki starts naming possible candidates, and discussing whether or not they'll be able to get along with them if that's the case. Among those mentioned include Akainu, Smoker, Katakuri, and Law.
  • Chekhov's Gag: One of the running gags of the Sports Festival is Aiko making memes as commentary. This backfires when one of those memes catches the attention of one of Izuku and Katsuki's old middle school classmates, who then publicly reveals the latter bullied the former, landing Katsuki's reputation in the toilet and prompting UA to pursue an investigation into Aldera's teaching practices.
  • Combat Pragmatist: Sanji may have been a good person, but he was still a pirate. That means Izuku has no issues playing dirty as long as he won't suffer for it.
  • Curb-Stomp Battle:
    • Mashirao vs. Seito. Mashirao is a master of Supernatural Martial Arts. The only thing Seito got from his Past-Life Memories is learning how to fight slightly better in dog form. It barely takes five minutes for Mashirao to turn him into a punching bag.
    • During the Provisional License Exam, a combined attack from Izuku and Katsuki allows the two to pass the first phase in thirty seconds, breaking several records and leaving everyone in the arena in Stunned Silence.
    • Class 1-A subsequently runs roughshod over the other examinees, becoming the first nineteen passing examinees within the first ten minutes. The outlier, Todoroki, only finished long after them because he elected to separate from them in fear of hurting them with his wide-scale attacks.
  • Curb Stomp Cushion: Katsuki vs. Hibiki. Considering Katsuki can cut through steel, the fact that Hibiki managed to put up a fight at all is impressive in itself.
  • The Dreaded: Very powerful Incarnates can become this as word of their strength spreads.
    • Hibiki Kinzoku was the original bar for how badly Priestess' Quirk could backfire. Being a super-genius that uses high-tech armor to fight villains and saved the universe in his past life, it's not hard to see why.
    • Izuku. When you can make everyone not named All Might or All For One look like a chump, it's not hard to see why.
    • Katsuki. Learning about Zoro from Izuku's Past-Life Memories made him number one on the list of people Priestess did not want to awaken, and learning that Katsuki is his reincarnation drives her into a screaming, writhing Freak Out.
  • Dramatic Irony: After the Big Three are hit by Priestess' Quirk and one of them is revealed to be from the One Piece world, everyone is worried they might be an old enemy of Izuku and Katsuki. Only the audience knows they have nothing to worry about, as the student in question, Mirio, is the reincarnation of their captain, Monkey D. Luffy.
  • Dramatization: A number of them, usually for humorous effect. For examples:
    • How Ryoga's memories ruined Mashirao's sense of direction.
    • Izuku's numerous personality clashes with Sanji, usually over whether or not to do something perverted.
    • How Zoro's memories broke Katsuki's sense of direction.
  • Dumbass No More: Mirio is Book Dumb. Compared to his past life Luffy, however, he might as well be a genius.
  • Everyone Can See It:
    • Everyone can see that Izuku and Ochako have got a thing going on, though they have yet to act on it themselves.
    • Everyone in the therapy group easily figures out that Momo's past life Erza Scarlet ended up marrying Jellal.
  • Everyone Has Standards:
    • While she does enjoy making fun of Hibiki at every opportunity, Aiko refuses to make fun of the time he tried to electrocute a swan by throwing his cell phone at it. While the execution was terrible, she admits swans are vicious along with the fact they have "teeth" in their beaks.
    • Kirishima is all for manly challenges, but when Tetsutetsu tries to challenge Katsuki to a spar in hopes of testing his sword skills against his Quirk, Kirishima immediately discourages it, acknowledging that won't be a challenge so much as a slaughter.
  • Eviler Than Thou: Thanos to All For One, something the latter even acknowledges. Unlike most examples, All For One isn't really disturbed by the depths of Thanos's evil so much as intrigued.
  • Face–Heel Turn: The Lost Souls, who are heroes that had villainous past lives. Two appear during the Training Camp arc and fight Mashirao and Toru, respectively.
  • Fainting: Mineta collapses after seeing Asura in action during Katsuki and Hibiki's exhibition match.
  • First-Name Basis: One of the rules of the therapy group is that they have to refer to each other by either their first names or nicknames. This leads everyone in the group to refer each other by their first names out of therapy as well.
  • Fling a Light into the Future: This is the reason All Might gives when telling Izuku to let Hibiki and him fight All For One by themselves. While both openly acknowledge that Izuku is fully capable of aiding them in the battle and not getting in the way, they feel it's more important for him to live to fight another day and get stronger for future threats instead of risking grievous injury now against All For One.
  • For Want of a Nail: Due to the Priestess awakening the past lives of 5 members of 1-A, a few things have changed:
    • Izuku is better able handle the strain of One For All, due to Priestess's Quirk forcibly strengthening his muscles and bones to handle Sanji's fighting style. This allows him to win the Sports Festival in spectacular fashion.
    • Momo does much better in the one-on-one tournament thanks to having Erza's skills. She makes it to the semi-finals and lands third place.
    • Mashirao's bad sense of direction somehow lands him second place in the Obstacle Course without going off the track and getting disqualified.
    • Izuku doesn't need to develop Shoot Style to lessen the strain on his arms since he already has Sanji's much more polished leg-based martial arts. In fact, he completely stops using his hands in combat since it feels wrong for him to do so, even though he no longer considers himself a chef first and foremost.
      • As a consequence of that and his increased strength in general, his self-destructive tendencies are significantly curbed, so Recovery Girl has no reason to stop healing him.
    • Both Ochako and Momo end up taking different internships under fellow, adult Incarnates that remained pro-heroes. Ochako because she's already a master martial artist thanks to Hinata's memories and thus doesn't need any training under Gunhead, and Momo because she doesn't suffer from her canon self-esteem issues due to a combination of Erza's memories and winning her match against Tokoyami.
    • Awakening Katsuki completely foils the League of Villain's attempt to nab him, as it turned out his past life was Roronoa Zoro, who is far too powerful for anyone in the League short of All For One to handle. This, in turn, prevents the Kamino Ward arc from ever happening, and prompts Shigaraki to start looking at other hero schools for targets instead.
      • Because Kamino Ward never happened, the proctors for the License Exam see no reason to increase the difficulty of the second half with a mock villain attack. This allows all of Class 1-A to pass the exam and get their provisional licenses. It's later revealed that even if that hadn't been the case, none of them would've been able to take the remedial course since the Commission hasn't started offering it yet.
      • This leads to Shigaraki attacking all the hero schools right after their License Exams and kidnapping several students, including Izuku, for leverage during the attack.
      • Because Shigaraki elected to have the League attack all of the hero schools, Toga wasn't able to replace Camie during the Provisional License Exams because she was too busy helping prepare for the assault. This allows Camie to pass the exam on her own merits, but at the cost of being one of the students kidnapped to draw All Might in for a confrontation with the League.
      • As the kidnapping happens after the License Exam, Aizawa manages to prevent the students from going after Izuku themselves by having Aiko keep them in the loop and directing them towards attacking the Nomu and evacuating the civilians. Izuku later turns out not needing to be rescued anyway, due to his increased strength and the help of his fellow kidnappees allowing them to escape on their own and rendezvous with All Might and Hibiki.
    • It also means that Katsuki doesn't try to pick a fight with Izuku after he figures out the secret of One For All, since he suffers from a Guilt Complex, not an inferiority complex. Instead, Izuku and All Might elect to let him fully into the secret, including showing him All Might's real body, since as Zoro's reincarnation, he's effectively Izuku's closest friend and a good starting point for his own support system.
  • Foreshadowing:
    • Hibiki's speech to Izuku when they first meet foreshadows that's he's Tony's reincarnation.
    Hibiki: And even if it was... there's still the other emotional baggage... I mean you have friends and family that you will never see again. People who you loved and you loved back... all gone in a snap.
    • During the I-Island arc, Kirishima and Bakugo manages to get lost during the I-Island arc while trying to find the part. While it is mostly Kirishima's fault, the fact that Bakugo didn't take charge and just followed him instead is rather telling. It's foreshadowing that his own sense of direction isn't all that good, and will soon become worse than Kirishima's.
    • Every time Priestess awakens a UA student's memories, it backfires. Originally attributed to bad luck, the League later theorizes that top-tier hero schools like UA and Shiketsu naturally attract powerful souls. This foreshadows Priestess' attempt to 'test' this theory by awakening the Big Three.
  • Foul Waterfowl: There was an incident where Hibiki was attacked by a swan and tossed his cellphone at it in the hopes that it would electrocute it. This incident is notable as Aiko (who makes fun of him at every chance) refuses to do so due to how vicious the birds are.
  • Fountain of Memes: In-Universe example. Hibiki's AI Aiko creates memes as a hobby, and goes wild with them during the Sports Festival.
  • Fun with Acronyms: Hibiki's AI assistant Aiko or Artificial Intelligence Knows Objectively.
  • Fuzz Therapy: Koda has been doing this for Bakugo by sending cats so he can pet after overhearing someone suicide baiting him.
  • Giving Up on Logic: Izuku admits that this happened in his past life. It is the One Piece world after all...
  • Green-Eyed Monster: Hibiki is initially very jealous of Ryuji due to his status as another paragon hero being reincarnated into the MHA world.
  • Grew a Spine: Izuku lost a good chunk of his Shrinking Violet personality due to him being Sanji.
  • Hated by All: Despite not being a killer like other villains, Priestess is one of the most hated criminals in the world thanks to her Quirk. It's telling that heroes have formed support groups to help her victims.
  • Heel Realization: Katsuki finally realizes what a massive asshole he's been to Izuku when he learns that he suicide-baited the latter and completely forgot about it.
  • Heroic BSoD: All of Class 1-A after Izuku is kidnapped by the League. Katsuki and Ochako in particular take it the hardest, with the former left screaming in anguish and rage while the latter collapses to her knees in sobbing tears.
  • Heterosexual Life-Partners: Izuku and Katsuki more-or-less become this after the later regains Zoro's memories.
  • History Repeats: Izuku has to deal with the fact that in both of his childhoods he was bullied for not having powers and being weak.
  • Hypocrite Has a Point: When Class 1-A meets Inasa and sees his antagonism towards Todoroki, somebody posits that Todoroki probably offended him in some way when they took the UA Recommendation Exam together. When Todoroki asks why they think that, Katsuki is the one to tell him that, before the Sports Festival, he could be a real jerk. While many note that Katsuki hardly has a leg to stand on, they also acknowledge that he isn't wrong.
  • Humiliation Conga: Bakugo gets a particularly karmic one: first Izuku beats him at the finals of the Sports Festival, causing a lot of people to mock him because of his pledge at the start of the festival, then he overhears a conversation about him detailing how awful he is, then a meme reveals he was a horrible bully to the public and makes him a pariah, then someone suicide baits him saying he deserves it because he did the same thing to Izuku, and finally he gets confirmation that he did suicide bait Izuku, which he completely forgot about. By the end of it all he's ready to eat crow just to figure out where he went wrong.
  • I Need a Freaking Drink:
    • Priestess' automatic reaction to awakening a problematic reincarnation is to go on a bender at Kurogiri's bar. So far the incidents that have induced this reaction are Hibiki (Tony Stark), Yuzu (Liz Lemon), the USJ Incident (a really bad one: "Black Leg" Sanji, Erza Scarlet, Hinata Hyuuga, Ryoga Hibiki, and Pinkie Pie, plus an appearance from All Might), and recently one that saw the reawakening of Tommy Oliver.
    • Aizawa after the Reassessment. While he doesn't immediately go for it due to it being on short notice, he does plan to go out drinking with Hibiki after the License Exam knowing that the reincarnated students will make a mess of things.
  • In Spite of a Nail:
    • With two exceptions (Toru and Mei switching places) the teams and their placement in the tournament remains the same (though Izuku and Momo do get farther than they did in canon).
    • Izuku, despite getting many offers, still interns with Gran Torino, with the reason being he wants to balance One for All with his past life abilities.
    • A UA student is still kidnapped by the League of Villains, leading into All Might having a final confrontation with All For One, which he wins at the cost of using up the last embers of One For All and being forced to retire after. The only differences are who the UA student is, that he wasn't the only hero student kidnapped, and the timing of the battle.
  • Irony:
    • Hibiki Kinzoku (aka Orchestra Rave) was so Hopeless with Tech that he couldn't use the Amazon website without help. His past life? Tony Stark.
    • Mashirao somehow manages to get so lost that he lands second place in the Obstacle Course at the Sports Festival.
    • Izuku, Sanji's reincarnation, has green hair. Katsuki, Zoro's reincarnation, has blond hair. A fact that is not lost on anyone.
    • Early on in the story, before his Character Development kicked in, Katsuki constantly derided Izuku for relying on his "pirate tricks" and claimed they couldn't measure up to having a Quirk, despite blatant evidence to the contrary. It later turns out that Katsuki is also the reincarnation of a pirate who uses those same "tricks", and even happened to be Izuku's crewmate during that same life.
  • Laughing Mad: Monoma, after learning about the Incarnates and watching their Reassessment videos, realizing that it's almost impossible for Class 1-B to surpass Class 1-A. When Class 1-A sees this, members of 1-B note that this is actually rather tame compared to his initial reaction, where he kept laughing madly and maniacally for hours.
  • Let Us Never Speak of This Again: The title of Chapter 71, aka the Deadpool chapter.
  • Like Mother, Like Daughter: According to Izuku, Pudding feared she would be this, which is why Sanji and her never had kids.
  • Logical Weakness:
    • Haki bypasses Logia defenses and allows the user to touch the Logia's real body. As Kurogiri's Quirk essentially functions on the same principles, that makes him susceptible to Haki as any Logia would be.
    • Momo has to recreate her armor piece by piece since she doesn't have access to her magical Hammerspace armory anymore. And since she can't lug heavy armory everywhere, she has to distract her opponent while she recreates the armor from her skin. According to Izuku, it took them a lot of practice to make that work in a reasonable timeframe.
  • Madness Mantra: Poor, poor Priestess.
    "I HAVE UNLEASHED A MONSTER!"
  • Massive Multiplayer Crossover: It seems no franchise is off limits. While some like One Piece and Naruto are pretty typical, there's also My Little Pony, the MCU, and (most surprising of all) 30 Rock. Even later on she added Power Rangers, Harry Potter, Doctor Who, and the DCAU to the mix.
  • Mythology Gag:
    • Izuku and Ochako's Ship Tease, as Sanji was actually supposed to be named Naruto until Oda's editors made him change it for the sake of the actual Naruto manga, which was about to debut at the time.
    • Also, one of Izuku's nicknames is "cinnamon roll". Guess what's Hinata's (Ochako's past life) favorite food?
  • Nice Job Fixing It, Villain:
    • Priestess used her Quirk on five UA students in hope of ridding the world of five wannabe heroes. Instead, she empowered them, one of them so much that he could go toe-to-toe with Nomu then and there.
    • This in general is the downside of her Quirk. While it usually takes out most heroes and even converts some to villainy, she also has a chance of awakening a reincarnation who can more than make up the difference. Particularly bad ones include Izuku (the worst case by far), Momo, Hibiki, and Ryuji, the recently awakened reincarnation of Tommy Oliver.
    • And it hits its absolute zenith with Katsuki, aka the reincarnation of Roronoa Zoro. Something that Priestess is intimately aware of.
    • Her attack on the Big Three is not quite as disastrous, but still pretty bad. While Nejire didn't regain much from her Past-Life Memories due to the lack of magic, Tamaki became a genius strategist that can keep up with Nezu. Then there's Mirio, whose lack of a devil fruit doesn't change the fact that he's become an even stronger Haki user than Izuku and Katsuki and has reunited the three strongest members of the most powerful pirate crew to have ever lived.
  • No Sense of Direction:
    • Poor Mashirao now has the worst sense of direction in all of anime. While it annoys everyone, it especially annoys Izuku, who was on the same crew as the man with the second worst sense of direction in anime. Ironically, that also makes him the most adept at corralling Mashirao.
    • Katsuki as well, seeing as he's the reincarnation of Zoro and has his Past-Life Memories awoken by Priestess as well. He's arguably even worse in the Mashirao, because he's in complete denial about it and ultimately can't be left alone to go anywhere.
  • Noodle Incident:
    • Izuku becoming cooking rivals with Lunch Rush. All that's known is that Lunch Rush tasted his cooking, declared him a rival and that it was food that Izuku made for All Might (as he's now cooking for him).
    • Twilight apparently tried to figure out a way to use the magic of friendship to create foals, but not for herself but rather so that Applejack and Rainbow Dash could have them.
    • Hibiki once left his house without pants, and Aiko, despite not having been built yet, really wants to tell the story. There's also a particularly embarrassing incident involving his phone that All Might heard about.
  • "Not Wearing Pants" Dream: Izuku has a dream about having a cooking competition with Lunch Rush where he's naked, as mentioned below, this is the least weird part of the dream.
  • Normal Fish in a Tiny Pond:
    • Sanji was one of the most powerful pirates to have ever sailed the Grand Line, but there were still quite a few people above him in life and when he died. As Izuku, however, he's so overpowered that the League of Villains have made it their number one priority to kill him before he can get any stronger, above even killing All Might.
    • Zoro is even worse than that. He was the World's Greatest Swordsman in his world, one step below the Four Emperors themselves. As Katsuki, who already had plenty potential because of his Quirk, he's essentially Izuku's only potential rival for Number One Hero.
  • Oh, Crap!:
    • Priestess flips when she views the memories of Izuku's past life as Sanji because none of his extremely powerful abilities were nerfed. At all.
    • Happens again in Chapter 55, when she views Bakugo's past life memories. The next chapter reveals why: Bakugo is the reincarnation of Roronoa Zoro.
  • Once Done, Never Forgotten: Aiko originally refuses to let Kirishima receive a transceiver so he can help keep track of Katsuki due to how he got Mashirao-levels of lost during the I-Island arc.
  • Person of Mass Destruction:
    • All Might and Izuku's reassessment flat-out wrecks the entire battlefield. Eventually they're forced to stop fighting just so they won't destroy everything.
    • Katsuki as well, when he bothers to let loose.
  • Plot Armor: A weird case where the plot armor isn't for Izuku but for everyone else. Let's face it, if the story was written realistically, then Izuku would have already torn through most of the villains in Japan short of the women and All For One. For the Sports Festival in particular, none of his opponents would've been able to land a hit at all. However, there still needs to be a story, so even when he's at full strength the author has to downplay how strong he actually is to give everyone else a chance to shine.
  • Power Creep, Power Seep:
    • Priestess's Quirk allows the victim's bodies to grow the required muscle strength needed for their past life's abilities, but it cannot recreate muscle systems and forms of energy that said abilities used — including chakra and magic. This nerfs both Ochako and Momo — the former used chakra for all of her techniques, and her entire fighting style was based on the disruption of chakra pathways. The latter can recreate weapons via her Quirk, but no longer has access to any magical weapons she may have had.
    • The fact that this doesn't apply to Izuku is a major plot point in the story because it makes him severely overpowered by My Hero Academia standards. Priestess point-blank states that he's basically guaranteed to become the strongest hero in the world now and even apologizes to her fellow villains for causing this to happen.
    • Another person this doesn't apply to is Ryuji — because apparently, the MHA world has a Morphing Grid. Meaning, all he needs to do is access it to regain his past life abilities.
    • Another person this applies to is Bakugo, who is the reincarnation of Zoro. That means all the logic that applies to Izuku, applies to him as well.
    • Mirio is the first person from the One Piece world to be nerfed, as he no longer has access to his devil fruit powers. However, he does still have access to his Haki, and considering that he's an even stronger Haki user than Izuku and Katsuki who is just as physically strong as them, that still makes him quite the force to be reckoned with.
  • The Power of Hate: Izuku's Hell Memories. They are played dead seriously when he uses the memories of his terrible childhoods to fuel them. Even more so when he uses the memories of both his death and Luffy's death as fuel.
  • A Rare Sentence:
    • Izuku after admitting he gave up on logic in his past life.
      Izuku: I just told you about a talking starfish becoming a famous fashion designer on an under sea island in a bubble.... I'm pretty sure that sentence speaks for itself.
    • During the therapy session about Spouses and Children, things get interesting...
      Hibiki: Okay! We are talking way too much about farm animal sex! Which is a sentence that should never be uttered ever!
    • Hibiki gets another when telling Izuku he needs to make sure he doesn't suffer from any more serve personality clashes.
      Hibiki: So for the sake of your health and mental state you must avoid peeping on women for the rest of your life. [...] I just had a legitimate reason to say that... but considering everything I go through I really shouldn't be surprised by that kind of stuff by this point.
  • Real Dreams Are Weirder: Before meeting Luna for the first time Izuku has a dream where he's in a cooking competition with Lunch Rush, not only is he naked but the event is hosted by a talking watermelon who sounds like Kermit the Frog and Lunch Rush repeats the word "button" over and over again.
  • Reincarnation: As per Emma Iveli tradition:
    • Izuku Midoriya: "Black Leg" Vinsmoke Sanji
    • Ochako Uraraka: Hinata Uzumaki, nee Hyuuga
    • Momo Yaoyorozu: Erza Fernandes, nee Scarlet
    • Mashirao Ojiro: Ryoga Hibiki
    • Tooru Hagakure: Pinkie Pie
    • Hibiki Kinzoku: Tony Stark (MCU Version)
    • Yuzu Hoseki: Liz Lemon
    • Hana: Rose Quartz
    • Chouko Ginga: Eclipsa Butterfly
    • Ryuji Hogo: Tommy Oliver
    • Hiroki Niku: Troy Barnes
    • Aoi Hakase: The Eleventh Doctor
    • Seito Kuroi: Sirius Black
    • Righteous Fury: Bellatrix Lestrange
    • Jack Attack: The Joker (DCAU Version)
    • Katsuki Bakugo: "Pirate Hunter" Roronoa Zoro
    • Nejire Hado: Mirajane Strauss
    • Tamaki Amajiki: Shikamaru Nara
    • Mirio Togata: "Straw Hat" Monkey D. Luffy
  • Reincarnation Friendship:
    • Izuku and Katsuki, as they were best friends (bordering on family) in their previous lives as Sanji and Zoro.
    • Later joining them is Mirio, Luffy's reincarnation, who recognizes Izuku-as-Sanji from the techniques he used during the Sports Festival, and is able to recognize Katsuki-as-Zoro by instinct alone. In return, Izuku and Katsuki are able to recognize him almost as instantly.
    • Momo and Nejire, who are Erza and Mirajane, respectively. Much like the three above, the two of them recognize each other immediately and share a hug.
    • Downplayed in the case of Ochako and Tamaki. While they knew each other well in their past lives, they weren't very close and don't have as deep a bond as the previous examples. Therefore, while they recognize each other as fellow ninja, Ochako doesn't recognize him on sight and initially mistakes him for someone else. Tamaki, meanwhile, only recognizes her as Hinata because he's now a genius thanks to Shikamaru's Past-Life Memories.
  • Running Gag:
    • Izuku going into Sanji's Heart Eyes dance mode.
    • "Don't question the cupcakes."
    • Katsuki being interrupted by Toru shoving a cupcake in his mouth.
    • Aiko the memelord.
    • Everyone's annoyance at Hibiki forgetting something.
    • Mashirao's and later Katsuki's No Sense of Direction.
  • The Rival: Izuku has at least five. One of them isn't even for pro-heroing — instead, it's Lunch Rush, who regards him as a rival cook.
  • Secret-Keeper: Outside of the therapy group, Iida knows about the history repeating aspect of Izuku's lives while Todoroki was told about Judge.
  • Secret Secret-Keeper: Bakugo overhears Izuku telling Todorki about Judge, but the only one who knows that he knows is Toru.
  • Seen It All: Izuku, Mashirao, and Hibiki, due to how weird their past lives were. Katsuki joins the list not long after, and very few things phase him now.
  • Ship Tease: Izuku and Ochako have something going on, but since they're still reeling from regaining memories of their past lives, neither of them have really bothered to acknowledge it.
  • Shipper on Deck: A weird case. Sanji ships Izuku and Ochako. Since Izuku is his reincarnation, he's technically shipping himself with Ochako, using Izuku.
  • Shout-Out: After Midoriya accidentally revealed that he used his raid suit's ability to peep at women's baths, Mineta utters "I sense a disturbance in the Force".
  • Spared by the Adaptation: Downplayed. Thanks to Priestess' freak out, Thirteen is never injured during the USJ.
  • Story-Breaker Power:
    • Izuku goes from being barely able to defend himself to the absolute strongest member of Class 1-A once he has access to Sanji's skills. Priestess went Laughing Mad once she realized how powerful he actually was.
    • Katsuki is even worse than Izuku. Not only was Zoro just as strong, if not stronger than Sanji, he's got none of Sanji's baggage regarding attacking women.
    • And the trifecta is completed with Mirio. Sure, he no longer has devil fruit, but he's still easily as physically strong as the former two with superior Haki mastery to boot.
  • Stunned Silence: The entire arena of the Provisional License Exam falls into shock after Izuku and Katsuki manage to pass the first part within thirty seconds. The only people who don't are Class 1-A, who promptly use the opportunity to pass themselves.
  • Surprisingly Realistic Outcome:
    • 96% of heroes hit with Priestess's Quirk quit the hero industry because they weren't heroes in their past lives and lack the drive to continue their careers (though there are some that do remain heroes that fall into this category like Yuzu). 3% remain heroes (usually because they were some kind of super-powered warrior in their past lives, like the five UA students), and the last 1% turn to villainy.
    • To be the reincarnation of someone means that person died. That means each and every single one of Priestess's victims knows what it's like to die. Is it any wonder why she's so hated?
    • Izuku cannot afford to have Sanji's Would Not Hit a Girl traits because now his job requires him to protect other people on top of himself. That's why he started training with Momo for the Sports Festival.
    • Ryoga's No Sense of Direction was a humorous gag. With Mashirao, it's extremely distressing because it can hamper his career as a hero, especially since he's still in training.
    • The Sports Festival is aired on live TV. It shouldn't be surprising that one of Izuku's old middle school classmates was watching it.
    • Pudding had numerous mental health problems, which were stated to get better over the years, but not disappear. Things like her split-personality made her feel unfit to raise children.
    • Being from the same world as another reincarnation isn't necessarily a good thing, as your past lives could have been enemies. For example, Seito Kuroi, the reincarnation of Sirius Black, doesn't bother hiding his past life's cause of death (something that is usually a very taboo subject, even among fellow Incarnates) because his murderer Bellatrix Lestrange's reincarnation, Righteous Fury, was also awoken by Priestess and is running around as one of the Lost Souls. When Mirio is awoken as a reincarnation from the One Piece world, there is significant worry that his past life could have been an enemy of Sanji and Zoro. Luckily, he isn't — he's actually the reincarnation of their captain, Luffy.
    • Luffy had a rubber body that allowed his stomach to stretch and accommodate his massive appetite. When his reincarnation Mirio, who inherited said appetite after the awakening of his Past-Life Memories, tries to eat that same amount, he's immediately put into a Food Coma because his body simply isn't fit to handle that much food anymore.
  • Tempting Fate:
    • After hearing all the things going wrong for the League of Villains at the USJ, Shigaraki yells out, "There is no way this can possibly get worse!" — cue Momo showing up and chopping off Nomu's arm.
    • After discovering that Mashirao was wandering around Japan for three days, Hibiki says "Can tonight get any worse?" cue Izuku's emergency beacon going off.
    • At one point, someone wonders if Luffy's reincarnation is nearby. Izuku and Katsuki think it over, then blanch and confess that they'd rather not know. Priestess promptly awakens Luffy's reincarnation, Mirio, some twenty chapters later.
  • There Are No Therapists: Averted. Due to the nature of the Priestess's quirk, support groups have been made just for victims.
  • Three-Point Landing: Hibiki does one during the final exam. He ends up hurting his knees due to the weights he has to wear.
  • Too Dumb to Live: Two reincarnated heroes in their past lives. Both of them survived cancer and decided to live their lives to the fullest however one died in a sky diving accident after choosing a rather sketchy company while the other trying to take a close picture of a rhino while on safari. Thankfully both of them took it in stride.
  • Underestimating Badassery:
    • Katsuki to Izuku constantly, until Izuku kicks his ass at the Sports Festival.
    • In a rare act of forgetfulness, the teachers at UA completely failed to account for the Incarnates' extra abilities (sans Izuku, for obvious reasons) when devising the final exams for the semester. They get a rude awakening when the exams start and those students start overpowering them.
    • It even happens during the Reassessment. To wit:
      • Seito Kuroi demands to be Mashirao's opponent because he defeated Righteous Fury, only to get his ass kicked because his past life was a Squishy Wizard while Mashirao's was a master martial artist.
      • Hibiki uses his complete Iron Man armor on top of his Quirk to fight Katsuki, figuring that would be enough to take him on. Unfortunately for him, Katsuki knows how to cut steel, so the armor barely offers him any extra protection, leading to him getting his ass kicked too.
  • Villainous Breakdown:
    • Priestess enters a Madness Mantra after learning about Izuku's past life as Sanji.
    • She has another one when she awakens Katsuki's past life as Zoro.
  • Wham Episode:
    • Chapter 12: During Izuku's match with Shinsou, he manages to use Conqueror's Haki.
    • Chapters 55-56: During the training camp, Priestess awakens Katsuki's Past-Life Memories...and it's revealed he's Zoro's recincarnation.
    • Chapter 80: Perhaps the biggest Wham Episode thus far. Priestess uses her powers on the Big Three, and they are all revealed to be souls from the same worlds as Class 1-A. Nejire is Mirajane, Tamaki is Shikamaru, and Mirio is Luffy.
  • Wham Line: In Chapter 17, Izuku uses his two most painful memories to power up Hell Memories, one of which reveals something important:
    "Shishishishi! You want my treasure! You have to find it! But I didn't leave it there! Can't have it be too easy! Because where's the fun in that!"
  • World's Best Warrior: Much like how Izuku is now the world's greatest chef, Katsuki is now the world's greatest swordsman.
  • World's Strongest Man: While officially it's still All Might (or All For One, for those who know of him), who the title actually belongs to is put into question after Izuku awakens his Past-Life Memories and inherits Sanji's abilities. Even more so when Katsuki and Mirio awaken their Past-Life Memories, as all three, even with some nerfing, are an easy match for All Might without their Quirks.
  • You Wanna Get Sued?: In-Universe. When Mina tries to use the name Alien Queen, Midnight points out that as Disney owns the franchise note  they would probably sue her if she tries to use that name.

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