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Art done by knilzy95.

Written by DinoCam1795 , Hero Academia D×D (alternate link to FanFiction.Net here) is an ongoing Fusion Fic of My Hero Academia/High School DD, with characters from other manga thrown in, where people with Quirks unknowingly live next to angels, fallen angels and devils, as well as people with strange abilities called Sacred Gears.

In this world, 80% of the population has a special ability, sometimes a superpower called a Quirk. One young man by the name of Midoriya Izuku wants to be a Pro Hero, a super-powered crimefighter, so he can save people with a smile and bring them hope in their time of need - much like his favorite hero, All Might.

The only problem? He's Quirkless, part of those who lack a Quirk. However, no amount of bullying or scorn is going to beat his desire to become a hero out of him.

A pretty girl he meets by pure chance tells him she can help him become a hero, in exchange for a date. Against his better judgment, Izuku agrees to it...

... and the girl, who turns out to be a fallen angel, kills him. In his death throes, Izuku makes one last wish: a chance to become a hero.

This catches the attention of Rias Gremory, a beautiful girl who just happens to be both a General Studies student at U.A. (Japan's most famous Hero School) and a High-class Devil. Moved by the intensity of Izuku's wish, as well as intrigued by his hidden power, she revives him by reincarnating him into a devil, as part of her Peerage.

This plunges Izuku into being part of two worlds, as he deals with villains from both sides of the masquerade while learning how to be a Hero... and dealing with the harem that he is unwittingly forming around himself.

That might as well be the hardest thing he can handle.


Hero Academia D×D provides examples of:

    open/close all folders 

    Tropes A-M 
  • Ability Mixing: Given that a good number of characters have Quirks and a Sacred Gear and/or magic/inhuman abilities, combining them isn't uncommon.
    • Momo combines her Fallen Angel Shock and Awe powers with her Quirk by making iron sand and manipulating it via electromagnetism.
    • Izuku can use Boosted Gear's main effect to increase the durability of his bones when he uses One for All, while the latter's energy serves him to increase the power behind his Dragon Shots.
  • Accidental Misnaming: Eri gets Rias's name wrong, thinking that her last name is "Granola".
  • Accidental Pervert: This trope is fairly common for Izuku, but fortunately the girls don't get violent over it. Much.
    • Sees Rias naked after waking up the day after the encounter with Dohnaseek. Not that Rias minds - she actually encourages him to look.
    • During the Rating Game, Izuku accidentally gets an eyeful of Koneko and Ochako after their clothes get partially ripped. He barely avoids getting punched by Koneko.
    • He walks in on Ibara while she's bathing and ends up flashing both her and Ochako.
    • During the fight against Liana, he accidentally gropes her. She goes immediately into Pervert Revenge Mode.
    • The final clash between Izuku and Todoroki causes some Clothing Damage that exposes her breast, much to Izuku's surprise when he notices it. Luckily she's understanding.
  • Achievements in Ignorance: Much to everyone's amazement and confusion, Celica somehow manages to get second place in the obstacle course, even though no one saw her getting through the obstacles and she never left the track.
  • Actor Allusion:
    • When Izuku meets Cao Cao, who has the same voice actor as Bakugo in English, he notes that their voices sound similar.
    • Both Ddraig and All Might share the same English dub voice actor, and they're both terrified of certain characters, Ryukyu, the daughter of the Chaos Karma Dragon Tiamat, and Gran Torino, former mentor of All Might, respectively, offering internships for Izuku. Ddraig even uses the same words when talking about Tiamat that All Might uses in canon when talking about Gran Torino.
  • Adaptation Deviation: Here, U.A. is now an Elevator School as opposed to simply being a 3-year high school.
  • Adaptation Name Change:
    • Ibara's familiar (the Sprite Dragon Asia got in canon) is named Raiku instead of Rassei because she's naming him after a different person.
    • Izuku chooses "Viridian" as his Hero Name instead of Deku.
  • Adaptation Relationship Overhaul:
    • Instead of Izuku, the Sludge Villain attacked Kyoka and Momo. This means that Izuku never meets All Might until the first Heroics class. But that said, this becomes subverted when the pair do become to form a relationship similar to seen in canon, as All Might chooses to give Izuku One For All.
    • Mirio reveals that he and Sir Nighteye had a falling out, with the implication it being related to the former's Refusal of the Call regarding One For All.
  • Adaptational Badass: The characters tend to be more badass than their counterparts in both canons.
    • Izuku gets Boosted Gear, the powers of a Pawn, and his draconic inheritance. This gives him Super-Strength, the ability to fly and fire long-range attacks, a gauntlet that can multiply all of his physical abilities to the point he can become a God-killing Lightning Bruiser and summon a Power Armor, and the ability to take up the powers of the Rook, Knight, Bishop or Queen if he needs them. Then All Might gives him One for All and Izuku manages (with Ddraig's help) to use its strength-boosting powers much sooner, combining it with Boosted Gear up to a certain point and developing Dragon Veil (the fic's equivalent of Full Cowl) faster.
    • In canon, All Might was able to defeat the USJ Nomu by pummeling it with three hundred rapid-fire punches. Here, it takes 500 hits to defeat even though All Might still has One for All. Given how the Nomu recovers from its injuries, it's heavily hinted (and later confirmed) that the Nomu was originally a Phenex family member, giving it a pure-blood devil's inherent toughness along with the Phenex's Healing Factor.
  • Adaptational Early Appearance:
    • Ibara, Kyoka, Momo, and Ochako appear several months before the exams, and Itsuka Kendo shows up for the first time during the exams instead of during the Sports Festival Arc.
    • Muscular appears during the USJ attack with the League.
    • Griselda Quarta joins Irina and Xenovia on their journey to Japan.
    • After losing her Excalibur, Irina uses Hauteclere in the fight at U.A., where canonically she didn't get it until well after she became an angel.
    • Cao Cao shows up briefly at the Sports Festival to talk to Izuku.
    • Eri manages to escape Overhaul and literally runs into Izuku shortly after the Sports Festival.
    • Hado Nejire and Amajiki Tamaki and Mirio Togata show up in the Hero Killer Arc.
    • The Meta Liberation Army arc characters show up during the Hero Killer arc.
    • Ingvild shows up after the internship arc, long before canon.
    • Yasaka and Kunou appear during the teens' outing to Disneyland, a lot sooner than the Kyoto Arc.
    • Not a person so much as an ability. In canon, Izuku only unlocked Gearshift during the Final War. Here, it's unlocked shortly after the Internship Arc, and is in fact the first secondary Quirk he unlocks in One for All.
    • Kame, aka Genbu Doumon, would be introduced in the prequel series SLASHDDØG, not appearing in the present day until the sequel series Shin High School DXD. Here, she's a member of the Vali Team before the Peace Summit, keeping his Blood Knight tendencies in check while making sure he doesn't come across as heartless during his fight with Izuku, and entered a Relationship Upgrade with him at some point before then.
  • Adaptational Nice Guy: While Vali still betrays the allied factions during the Peace Summit and threatens Izuku's friends and family to try and get a rise out of him, it's made clear the latter was him making empty threats he would never be willing to follow through on, Bikou and Kame's arrival causing the latter to reveal he's just being a Blood Knight trying to rile Izuku up, and is otherwise a chuunibyou who wrote three notebooks worth of plans on what to do or say when he finally met his destined rival. It's furthered with the reveal the three of them are fake defectors, having been entrusted with infiltrating the Khaos Brigade by the allied factions, namely Azazel, for the sake of finding out what Ophis is planning, their "defection" just a performance that Vali nearly got Lost in Character with out of excitement from finally facing Izuku. DinoCam would justify this by noting how Vali's canon characterization during the Peace Summit ends up feeling incongruous with his later depiction as a Friendly Rival to Issei that saw Azazel as his Parental Substitute and was motivated by revenge on the abuse his grandfather subjected him and his mother too, instead opting to have Vali's character match that from the start, introducing Kame/Genbu much earlier to reinforce the notion by drawing on their canonical history.
  • Adaptational Superpower Change:
    • Izuku, instead of One for All, has the Boosted Gear and, as the descendant of a dragon, can partially transform into one. All Might still offers the Quirk to him, which Izuku accepts after the fight with Kokabiel.
    • The Armed Detective Agency have Sacred Gears instead of Abilities, though said Sacred Gears are based on the Abilities they have in canon.
    • Rashomon is a Quirk now, and Higuchi has a Quirk that allows her to control the trajectory of her bullets, as well as a currently inactive Sacred Gear corresponding to her unknown canonical Ability.
    • Zero's Quirk is a People Puppets ability that lets him control the movements of anyone in a certain radius of himself via their bones instead of the power to give any order to anyone he makes eye contact with once.
  • Adapted Out:
  • Age Lift:
    • Rias and the other D×D characters begin the story as two years younger than in canon. For example, in canon, she was a third-year while Issei was a second-year when she reincarnated him. Here, she's a first-year high school student while Izuku is a third-year middle school student when she reincarnates him, a few months before the U.A. Entrance Exam.
    • Hyde Kido was in his second year of high school in canon, but here he is Izuku's age.
  • Ain't No Rule: Basically Midnight's reaction to Izuku's trick of switching and inverting the headbands so the 10-million-point one is on Milia's neck and a second one is on her forehead, preventing anyone from realizing until it's too late.
  • All Myths Are True: Much like High School DxD, several mythological figures are treated as real and wielded Sacred Gears themselves, among those name-dropped include King Arthur and Hercules.
  • Amazingly Embarrassing Parents: Both Izuku and Rias suffer from this.
    • Inko openly reminisces about her own "adventures" with her husband, is not shy about her Shipper on Deck and I Want Grandkids attitudes, and punishes Izuku for not telling her about Rias' birthday by showing his friends his embarrassing childhood photos.
    • Venelana teases the hell out of her daughter about her attraction to Izuku, while Zeoticus makes no qualms about taking photos of his daughter while she's being embarrassed. Rias actively dreads the possibility of Inko and Venelana becoming friends.
    • Chapter 52 is pretty much this trope. Izuku's parents, Rias' parents and brother, Sona's sister and even Kaminari's mother all do their best to thoroughly embarrass the teens.
  • Armor-Piercing Question:
    • Dazai fires a set of questions to Bakugo in Chapter 47, causing the latter to start questioning his beliefs.
      Dazai: What do you think it means to be a hero?
      Bakugo: What? It's being the strongest, the one that always wins, duh.
      Dazai: Really? Then wouldn't that mean you aren't a hero, since you lost at the sports festival?
      (Bakugo snarls)
      Dazai: And by that definition, that would also mean All Might shouldn't be the Number One Hero, either, since Endeavor has defeated more villains, yet he is. Why do you think that is?
  • Ascended Extra: In stark contrast to their canonical status, students of 1-B have a much greater presence, as they interact with their 1-A counterparts much more frequently outside of school events.
  • Awful Truth: Kokabiel revealing that God Is Dead in Chapter 31 is treated like this by pretty much everyone but Mizu, Griselda, and Akutagawa. The former two knew already (Mizu because all the Kamar-Taj graduates are told as a test, and Griselda because of Lailah) while Akutagawa just didn't believe in God, to begin with.
  • Bad Powers, Good People: The Bael and, with Venelana marrying Zeoticus, Gremory families' Power of Destruction is a force that can destroy and decay anything it touches, making users gain monikers such as Flaxen-Haired Madame of Extinction or Crimson-Haired Princess of Ruin. At the same time, the Gremory are known for treating their servants as members of their own family and are quite fair in their dealings.
  • Batter Up!: When Monoma begins to mock Kyoka before her fight with Ibara, Momo creates a metal bat and knocks him out.
  • Bedmate Reveal: Izuku keeps waking up to find a girl (or several), naked or wearing flimsy clothing in his bed. The first time is Rias, the second time is Rias, Ochako and Ibara, the third is Milia, then Milia, Fuyuko and Nejire.
  • Big Fancy House: The canon mansion that was introduced in Volume 5 of DxD, ends up becoming the Midoriya family's new residence as their small apartment couldn't fit all the new residents living there. And just like canon, it's not only enormous, boasting six floors and two basements, but it's also only a ten-minute walk from U.A. campus.
  • Boring, but Practical: During the Cavalry Battle, instead of going for the 10-million-point headband and having to deal with whatever Izuku cooked up, Liana decides to take the headbands from other teams and then stays away from the fighting the moment she has enough of them. This helps to put them in second place. Monoma tried to do the same but made the mistake of going after (and mocking) Bakugo.
  • Breaking the Fourth Wall: When Stan Lee makes an appearance, he directly addresses the reader right before the scene changes.
  • Breather Episode: The Sports Festival Arc, while combat-heavy, stands out as this between the Holy Sword Arc (where Kiba achieved his quest for revenge and Xenovia ends up joining Rias' Peerage) and the Hero Killer Arc, where the heroes are going to face off an even more dangerous Stain and possibly Lailah.
    • Chapter 51, aptly titled "A Much-Needed Break". While it does have some significant plot developments, for the most part it's simply Izuku and the girls hanging out at Tokyo Disneyland and having a great time.
    • Chapter 52, "Parents' Day", features the hilarious moments where Izuku, Rias, and their friends have to deal with their Amazingly Embarrassing Parents - while everything builds up to the Peace Conference Arc.
    • Downplayed with Chapter 53, "The Halfblooded", as while it has several big revelations and character moments most of it is pretty calm, though things get much more serious as the chapter ends.
  • Bunny-Ears Lawyer: Ranpo has No Social Skills and doesn't even know how to use the train, but he can solve crimes in seconds - and he's Quirkless, meaning he's just using his natural deductive abilities.
  • The Cameo: Stan Lee makes one in chapter 52 as a comic book shop owner, complete with Breaking the Fourth Wall. Fittingly, the chapter was published on Stan Lee's 100th birthday.
  • Can't Kill You, Still Need You This trope is implied to be the reason why Slidin' Go is being instructed to go into hiding for his blunder in killing Shujin's principal, as he's one of the few Pro Heroes to be in the Meta Liberation Army and thus types like him are extremely hard to come by.
  • Chick Magnet: Izuku (much to his befuddlement) is attracting pretty girls like honey attracts flies without even trying. By the time he starts attending U.A., three girls like to sleep naked in his bed, six more are harboring crushes on him, quite a few others have made a pass at him and, per Word of God, at least eleven more will eventually join in his Unwanted Harem. According to Ddraig, girls find him instinctively more attractive than other boys because of his natural personality and the personal power he carries from his draconic ancestry and the Boosted Gear.
  • Clingy Jealous Girl: Izuku keeps attracting these into his Unwanted Harem.
    • Ibara, Ochako, and Rias compete for Izuku's attention from the moment the three girls start living with the Midoriyas.
    • During the Sports Festival:
      • Izuku being in the same team as Mei, Ibara, and Milia cause Rias and Ravel to almost go Yandere on the poor kid.
      • Milia kissing him in the forehead causes Hagakure, Ibara, Mina, Momo, Ochako, Ravel, Rias, Setsuna, and Tsubasa to glare at her.
      • Mei throwing air kisses at Izuku brings in the ire of the above mentioned (save for Milia and Ibara, who were also targeted by the air kisses), plus Kendo and Tsuyu. Rias and Ravel are so intense that everyone around is scared off.
      • Izuku accidentally groping Liana not only attracts the ire of all the girls (some of them partly because they wanted to be the one that got groped), but when he goes to talk with Rias afterward for an unrelated reason, Rias tells him that the incident better not repeat itself.
    • After the Sports Festival, Rias actually calls a meeting with most of the girls to discuss their mutual feelings for Izuku so they can try to avert too much escalation.
    • At the swimming pool, Rias gets Izuku to put some sun lotion on her - and attracts the attention of the other girls, who demand that Izuku do the same for them. They also get angry when they see a naked Xenovia straddling Izuku in the equipment shed, but fortunately they notice what was really going on and only take it out on Xenovia.
  • Color Failure:
    • When Irina impulsively kisses Izuku when he comes to see her off at the airport, Rias, Ibara, Ochako, Ravel, and Momo all go white with shock.
    • When All Might reveals that he knows that the ORC members are devils, Izuku turns so pale that he looks like a corpse.
  • Combo Platter Powers: Several characters, in part because it's possible to have a Sacred Gear and a Quirk, and reincarnated Devils get their Quirk and/or Sacred Gear plus their devil abilities and any magic that they learn after their reincarnation.
    • Ibara has her canon Vines Quirk and the Twilight Healing Sacred Gear, later getting the Bishop piece.
    • Momo combines her Creation Quirk with a second Quirk that lets her control lightning and magnetic fields (actually her Fallen Angel powers), and obtains the Queen piece.
    • Ochako initially has her Zero Gravity Quirk, but later discovers she can do magic and gets the Rook piece.
    • Kiba has a Quirk that allows him to change his gravitational orientation, but only when walking on a surface (like a wall), plus his Sword Birth Sacred Gear and the Knight piece.
    • Milia Takamaki has both the natural powers of a Succubus and the Spearfinger Quirk.
    • Izuku has Boosted Gear, his draconic and devil powers and the ability to Promote, which ensures he is a powerful hero in the making and that's before he became One For All's Ninth Torchbearer.
    • Itsuka has the Sacred Gear Turbo Cestus, which gives her a pair of Power Fists that meshes well with her Big Fist Quirk.
  • Composite Character: Several main characters are fused as part of the story.
    • The main character is Izuku with Issei's Boosted Gear, part of his backstory (becoming a devil after Raynare kills him) and penchant to somehow have all sorts of girls want to jump his bones.
    • Ibara takes Asia's Twilight Healing, backstory (a Catholic girl who, due to Twilight Healing, became a saint of sorts only to be excommunicated because she healed a devil) and hero-worship of the main character.
    • Momo gets Akeno's lightning and BDSM tendencies, as well as backstory as the daughter of a Fallen Angel she is estranged with.
    • Mineta gets Motohama's ability to get a girl's measurements by sight.
    • Fuyuko Yukimura appears to be one of Mizore Shirayuki from Rosario + Vampire, and Shiho Suzui from Persona 5. Her being abused by the gym coach brings to mind both Mizore's abuse by Okuto Kotsubo and Shiho's abuse by Suguru Kamoshida. She attempts to commit suicide like Shiho as a result, but said attempt is thwarted by Izuku and Milia much like Mizore's attempt was by Kurumu, who Milia is an expy of. Appearance wise she resembles Mizore with long pale blue hair, she is noted to have "cold hands", and she attends Shujin Academy like Shiho.
  • Contrived Coincidence: Out of all the students the electric villain could have tried to use as a hostage, he picked Yura Tsubasa, who has a Quirk that allows her to turn herself non-conductive and absorb energy to use it.
  • Cool and Unusual Punishment: For not warning her about Rias' birthday party (even though he only found out the morning of), Inko punishes Izuku by... sharing all of the embarrassing photos she has of him with the rest of the peerage.
  • Covert Pervert:
    • Going by some of Inko's comments, it seems like Inko and Hisashi were quite wild in their youth - and that hasn't stopped with age.
    • When Izuku lands on Milia's boobs and accidentally rubs his face on them, Milia admits (to herself) that she had fantasized about that. Later, when hearing about Saji's "dream" to get Sona pregnant, her reaction implies that she wouldn't mind getting knocked up by Izuku. Given that she is a half-succubus, it's pretty much for par.
    • Momo sleeps with Kyoka regularly, and she also has Akeno's Combat Sadomasochist traits, but she's just discovering them and is ashamed about it - but it can still get out of hand, such as when she had to be stopped by the others when finishing Kiba's spanking punishment, because she was so entranced that she lost count. She also doesn't mind the audience at the Sports Festival getting an eyeful, since Mineta had been contained at that point.
    • Besides the aforementioned sexual relationship with Momo, Kyoka is noted to love the idea of seeing Rias in a tennis outfit and has a Nosebleed when seeing her in a swimsuit. She is later shown having a similar reaction to seeing a picture of Izuku shirtless and straight-up faints when she learns how large he is later.
    • Itsuka Kendo's first appearance has her poke Izuku and notice how sculpted he is under his clothes - and her mind promptly provides a lot of dirty thoughts of what she would do if he was not wearing said clothes.
    • Rias takes notes on buying sexy clothes and learning how to dance for the sake of teasing Izuku.
    • Mina wouldn't have really minded dissolving her clothes to get out of Todoroki's ice, thus giving everyone a look at her nude, if Mineta hadn't been there to perv on her. She is also very happy to learn Izuku's proportions.
    • After Izuku accidentally gropes Liana Kozuki, several girls wish it had been them that got groped instead.
    • As for Liana herself, while she initially goes into full Pervert Revenge Mode, upon later reflection she realizes that she actually liked the sensation, and was kind of disappointed when he lets go.
    • When Rias holds a meeting for most of the girls interested in Izuku, their reactions to seeing a picture of him shirtless and learning how large he is all fall under this.
  • Curb-Stomp Battle: The Rating Game versus Riser Phenex and his Peerage. Thanks to their strategy, their powers, and being underestimated, Rias' Peerage manages to destroy their rivals, with the only loss being Ibara when she takes a fire attack for Rias.
    • Izuku manages to defeat Ibara in the Sports Festival in seconds, with her being barely able to touch him before he (gently) pushes her out of the ring.
  • Curb Stomp Cushion: Todoroki defeats Kendo in the Sports Festival, but she makes the other teen work for it harder than any opponent up to that point.
  • Crazy-Prepared: Nezu, after the USJ incident, secretly installed a separate security system completely independent from the main U.A. systems, which allows him to see a recording of the fight against Kokabiel.
    • During the Cavalry Battle, after Ibara snatches Rin's headband, Milia takes advantage of being in a smoke cloud to put the headband on her forehead and the 10-million-point headband around her neck in such a way that no one can tell which one is which. When Todoroki takes one of the headbands, he ends up picking the one on her forehead, which prevents him from realizing he didn't get the 10-million-point headband until it's too late.
  • Cuteness Overload: Rias when faced with Izuku's childhood photos. She even drools.
  • Death by Adaptation: A hooded figure murders Kokabiel in Cocytus so that the Fallen can't reveal anything to his captors.
  • Dungeon Bypass: Lampshaded by Present Mic when Izuku manages to get past most of the Sports Festival's Obstacle Course by flying.
  • Eating the Eye Candy: Ibara, Ochako, and Rias are almost drooling at the sight of post-Training from Hell Izuku. Momo does also admire him.
    • The girls when looking at Izuku's shirtless photo. Half of them is left drooling or bleeding.
  • Elevator School: U.A. adopted the system a year before the story started starting from elementary school to university; although the high school, with its hero course, is considered the main school. Rias says that her father had a hand in it. Meta-wise, it's an obvious action to keep the ORC together, since Koneko is still in middle school.
  • Enemy Mine: The Port Mafia and the Exorcists work with the devils to stop Kokabiel's plans.
  • Epic Fail:
    • When Ile and Nel (the chainsaw-wielding twins in Riser's Peerage) attack Izuku, they instead hit the wall and the floor. The chainsaws break and they hit themselves in the head. Their teammates can barely believe it, while Ochako thinks it's hilarious.
    • Ibara's first attempt to help with the cooking ended with her burning the eggs and the juice (somehow).
    • Momo's chocolate is so horrible that Izuku faints when he attempts to put a piece in his mouth (attempts as in the "chocolate" comes nowhere close to his mouth before he faints), and even after over an hour of Twilight Healing, he can't taste anything for a week. Kyoka mentions before that her father almost died once when trying her cooking.
    • Tsuyu admitting that she likes Izuku shocks Ochako so much that she doesn't even think to try and use her Quirk on the former girl's tongue until Tsuyu asks her why she didn't after the fight.
    • Bakugo's loss in the Tournament. Not only does he fail to do significant damage to Mei (he only wrecks a piece of her gear), he essentially eliminates himself by blasting himself so fast he flies off the ring after Mei shoots a capture net at him.
  • Everybody Knew Already: Besides Izuku (who only found out a few hours before), Mineta and Kaminari, everyone in 1-A already knew that Todoroki was a girl, they were just trying to be polite by not saying anything.
  • Everyone Is a Super: In addition to roughly 80% of the human population having a Quirk of some kind, there's also magic in the form of spellcasting and Sacred Gears, as well as the supernatural races like Devils.
  • Evil vs. Evil: The Port Mafia are far from heroes, but they want to stop Kokabiel from starting a war between the Three Powers, presumably to preserve their profits. They also apparently don't get along with the Shie Hassaikai, as when Overhaul sends word out for Eri's return after she escapes, he states that he doesn't want the Port Mafia to know.
  • Expy: Some of the characters not from existing series serve as references to other characters and their series.
    • Milia Takamaki is one to Kurumu Kurono from Rosario + Vampire, being a Succubus, having near-identical appearances save for Milia needing glasses, and her Quirk replicating Kurumu's Wolverine Claws.
    • Kudelia's peerage contains a couple. Aside from Cammie and Celica, there's the aforementioned Milia, her Queen Tye and her knight Yuko.
    • Lailah is one for Airachnaid from Transformers: Prime, her antagonistic relationship with Griselda drawing to mind her basis' relationship with Arcee.
    • Rosalba, the foreign exchange student working as Recovery Girl's intern, is one for Sapphee from Monster Girl Doctor.
  • Expecting Someone Taller: When Doctor Strange first meets Izuku, this is what he says.
  • Fake Defector: In a contrast with his canon motivations, Vali and his team are not genuine members of the Khaos Brigade here, rather they are double agents tasked with infiltrating the group and trying to learn what Ophis is planning with the group, with the only ones aware of their true allegiance being Sirzechs, Michael, and Azazel, the latter of whom they keep in contact with.
  • First Kiss: Between Izuku and Rias in Chapter 18. At least for Rias. Irina stole Izuku's when they were five while he was asleep.
  • Flawed Prototype: "Thou Shalt Not Die" is a prototype of Twilight Healing, and it has the flaw of needing the subject to be on the brink of death for its power to work.
  • Forced into Evil: The individual who awakened Ingvild also placed a control device on them, and is forcing them to spy on the heroes against their will as repayment.
  • For Want Of A Nail:
    • Due to the rise of Quirks and subsequent "dark age" brought about by the chaos Quirks caused, various organized religions faced upheaval, causing damage to the Supernatural factions. Many religions that weren't compatible with Quirks died out, while others had to adapt to maintain some level of influence. Rias notes that the Abrahamic religions in particular were hit hard, the number of followers reduced to less than a quarter of what they once were. She also notes that Sirzechs told her that, initially, the Satans had planned on revealing themselves so as to try and alleviate the chaos, but decided against it out of fearing making things worse.
      • Conversely, the advent of Quirks made it a lot easier for some supernatural races to more easily integrate with humanity, able to pass off their inhuman traits as just being byproducts of Quirks.
    • Because Raynare didn't toy with Izuku's feelings as much as she did to Issei in canon, Rias is willing to let her go at Izuku's request.
      • As Izuku doesn't suffer from the same level of PTSD Issei had, he's more aware of the girls' feelings for him and confesses to them all before the Peace Conference Arc.
    • All Might saved Momo and Kyoka from the Sludge Villain instead of Izuku.
    • Due to having the Boosted Gear, Izuku scores first place in the U.A. Entrance Exam, while Bakugo is pushed down to 5th place. Conversely, as Izuku didn't need help landing after taking out the Zero-Pointer, Ochako scores lower than in canon, taking 10th place.
    • Izuku makes more of an impression on Ravel Phenex - enough that she transfers to U.A. much sooner than she transferred to Kuoh Academy in High School D×D.
    • The Rating Game ends in victory for Rias' Peerage, averting the fight at the wedding. Izuku's use of his Scale Mail takes place instead at the USJ.
    • The USJ class trip involves Classes 1-A and 1-B instead of just 1-A.
    • The fourth and fifth Japanese Heroes are Liana's parents, Zero and Guren, which displaces everyone in the canon list from Best Jeanist down.
    • Only 32 students make it past the Obstacle Course instead of 42. Due to this, Aoyama, Hagakure, Mineta, and Sero don't make it to the Cavalry Battle.
    • Ibara and Milia take Ochako's (who teams up with Liana, Shinso, and Itsuka) and Tokoyami's (who is instead with Kaminari, Tetsutetsu, and Honenuki) places in Izuku's team. Tsuyu takes Sero's place in Bakugo's team, while Kyoka replaces Kaminari in Todoroki's team.
      • As a result of the Battle, Kaminari, Tetsutetsu, and Tokoyami don't reach the final event. With Aoyama and Sero dropped in the Obstacle Course, it leaves five places that are taken by Kendo, Kyoka, Liana, Milia, and Tsuyu.
    • The different lineup in the final tournament causes further changes:
      • Kendo, Hatsume, and Momo make it to the quarter-finals, respectively defeating Kirishima, Bakugo and Iida.
      • Izuku, Ibara, and Kendo reach the semifinals after defeating Liana, Tsuyu and Momo.
      • The tournament ends with Izuku (who defeats Ibara) vs Todoroki, with the former winning the fight.
    • Izuku gets confirmation that One For All contains echoes of the spirits of the previous users after the battle with Shinso thanks to Ddraig.
    • Eri ends up being freed from Overhaul's grasp during the time period between the Sports Festival and the Spring internships by an unknown person, who places her in the path of the ORC for them to take care of, rather than being rescued in late summer/early fall during the Yakuza raid.
    • Izuku chooses "Viridian" as his hero name instead of "Deku".
    • Bakugo (who only got 8 internship offers) ends up interning at the Armed Detective Agency instead of Best Jeanist, while Momo and Itsuka (on Izuku's advice) pick Fat Gum and a Pro Hero called Thunder Fist, respectively, instead of Uwabami.
    • Gran Torino, hearing about all the internship offers Izuku got, travels to him at U.A. to help him train instead, and Izuku calls the new technique he develops "Dragon Veil" instead of "Full Cowl". Izuku ends up going to Ryukyu's agency in Shinjuku instead.
    • There are more than just three Nomu in Hosu, and a different group of hero students answers Izuku's distress call. The Winged Nomu also grabs Itsuka instead of Izuku.
    • Mirio ended up leaving Nighteye's agency over what happened with him after he turned down One For All.
    • In the end of term practical exam, both hero classes are mixed up in groups of 5, and instead of fighting the teachers they are put through different scenarios (such as Hostage Situations or Disaster Rescue) while being pit against Pro Heroes (Izuku's team has to fight Mirko and Ryukyu, for example).
  • Foreshadowing:
    • When Ochako explains her Quirk in Chapter 5, Izuku notes that Dazai seems to have had experience with gravity manipulators. When the Port Mafia shows up, one of them is revealed to have the power to increase the effect gravity has on his target.
    • In Chapter 7, when Rias takes Izuku and Ibara to get their familiars, the Familiar Master initially offers Izuku as a potential dragon familiar, and Izuku feels a jolt of fear when he mentions Tiamat. He also has several draconic powers, namely a transformation that grants him dragon wings and scales, that Issei never got from the Boosted Gear. Come Chapter 16 and it's revealed that Izuku has dragon heritage.
    • In Chapter 23, there's a news report talking about a tiger in Yokohama. Bungo Stray Dogs fans will automatically know who said tiger is.
    • Lailah is first mentioned by All for One's doctor as having arrived back in the city in chapter 25. The next chapter has a woman with spider traits, revealed to be Lailah in chapter 29.
    • Early in the story, Rias mentions that All Might is also famous in the Underworld and that devils often try to recruit heroes. All Might reveals in Chapter 32 he knows about the ORC being devils because he's been visited by so many devils trying to recruit him, he can spot them a mile away.
    • Chapter 35's big reveal, that Todoroki is a girl, gets much foreshadowing (post-Orwellian Retcon).
      • When getting ready for Battle Training, he is mentioned as waiting until the others are out to put on his costume, with All Might's internal monologue mentioning he knows that it is not because Todoroki is shy and just before Class 1-A and 1-B leaving for the USJ, Aizawa notes to himself that Todoroki won't be able to keep his true identity a secret for much longer when he arrives last for departure and Iida berates him for it.
      • Aika reveals her ability, mentioning she knows how much the 11 1-A male students are packing downstairs when there are supposed to be 12.
      • Before the Quirkless sparring between Izuku and Todoroki, Mizu calls out Todoroki-channote .
  • From Roommates to Romance: Ibara, Ochako, and Rias end up living with the Midoriyas for diverse motives. Of course, the three girls would really prefer it to be less innocent, and are very much not shy about showing Izuku how much.
  • Funbag Airbag: When Tsuyu throws them both into the boat at USJ, Izuku lands face first into Milia's bust.
  • Gambit Pileup: In addition to the League of Villains and the Khaos Brigade's canon members, and the ones that they have in this AU, there are a number of other powerful factions and beings up to their own plans against the plans of the heroic characters.
  • Get A Hold Of Yourself Man: Izuku does this to Rias when she nearly falls through the Despair Event Horizon during the battle with Kokabiel after he confirms God Is Dead.
  • Godzilla Threshold: Kokabiel's attack on U.A. is a big enough threat that Momo contacts Sirzechs and Mizu calls in the Sorcerer Supreme - not that they arrive on time to make a difference.
  • Got Me Doing It: Rias starts picking up some of Izuku's habits, like mumbling and taking notes, over time.
  • Great Offscreen War: The Second European War, which Griselda fought in. It's where she met her Arch-Enemy, Lailah.
  • Half-Human Hybrid:
    • Milia's father was a human, which is why she has a Quirk, while her mother was a succubus.
    • Ryukyu is the daughter of Tiamat, one of the Five Great Dragon Kings.
  • Harmful Healing: Doctor Yosano's Sacred Gear, Thou Shalt Not Die, is almost as good as Twilight Healing, but it only works if the target is on the brink of death. Thus, she always carries stuff like a machete to induce said status on her "patients".
  • Happily Married: While you do have your canon staples such as Zeoticus and Vanalana, Sirzechs and Grayfia, etc. Hisashi and Inko are notable for being this, making it one of the few, if not the only, times that Izuku's parents are depicted as such in fanfiction. Not even putting on weight from her stress eating during Izuku's younger years has done anything to Hisashi's attraction to Inko, with the latter commenting that the first time he saw her like that, he called her "round and sweet".
  • Henpecked Husband: Only one meeting with Sirzechs and all of Rias' Peerage knows who is the one in charge in his household. Similarly, Zeoticus Gremory is well under his wife Venelana's thumb.
  • Heroic BSoD: Played for Laughs after Rias kisses Izuku. That night, Ddraig's attempts to call his attention are fruitless because Izuku's mind is on a loop over the kiss. As the story puts it, "It appears that an error has occurred with MidoriyaIzuku.EXE."
    • Irina kissing him for a full minute leaves him so out of it that he doesn't recover until he's back home an hour later.
    • Xenovia asking him to get her pregnant knocks him out of the park.
    • The "MidoriyaIzuku.EXE has crashed" joke returns when Rias, Ibara and Ochako try to get Izuku to say whose boobs he likes most - while they are pressing him against said boobs.
  • Heroic RRoD: Because Quirks are biological functions, there are set limits as to how much an individual can use them. Aoyama Yuga is noted to be the most extreme example, only being able to use his Quirk, Navel Laser, for one-second before causing internal distress, though just like muscle overcompensation, this is mitigated by constant use and training.
  • Heroic Sacrifice: In Chapter 55 Itsuka's mother Lasha kills herself rather than follow through on the command to kill her daughter, as Itsuka had managed to inadvertently damage the collar used to control her during her earlier struggles.
  • Hidden in Plain Sight: Due to the advent of Quirks, the supernatural has been interacting with the mortal realm more openly as any oddities can simply be dismissed as a Quirk. The only individuals who would have to worry about breaking the masquerade are those who have both Quirks and Sacred Gears, or some other supernatural power, like Momo's lightning, and even then, Momo passing her power off as a second Quirk being believed by the ORC, and Bakugo not finding anything unusual about Ibara using Twilight Healing on him during the USJ incident implies that such excuses aren't uncommon.
  • Hoist by His Own Petard: Both Bakugo and Iida lose in the same way, by going too fast only for their opponent to do something that causes them to fly out of bounds (Bakugo gets stuck in a capture net while Iida slips on an Oil Slick).
    • A group of drug dealers Momo and Tsubasa are fighting with Fat Gum knocks the latter girl into their supply of Trigger, and she promptly uses the power boost to help take them out.
  • Humans Are Special: Normally only humans, or at least hybrids and/or reincarnated individuals like Milia, Ochako, etc., have Quirks.
  • Humans Are the Real Monsters: Some humans, like Freed, can match and even exceed the worst evils of the supernatural races.
    • Valper even lampshades this, saying that Michael is more human than he ever will be.
  • Hybrid Power: One must either be a Half-Human Hybrid or a reincarnated Devil to have a Quirk and/or Sacred Gear naturally, and they can combine these powers with their supernatural abilities.
  • Hypocrite: Riser calls Izuku a selfish brat for interfering in the arranged marriage between him and Rias - when he's only trying to force the wedding through to stroke his ego and turn Rias into his Trophy Wife and her Peerage into his slaves, normal (Kiba and Izuku) or otherwise (Koneko, Ibara, Momo and Ochako).
    • Valper lampshades the hypocrisy of the Church in how they banished him for his research, but still ended up using the results to make Holy Sword wielders, although he admits that Michael probably didn't kill anyone to do so like he did.
  • Hypocritical Humor: When Griselda meets Mizu and Midnight, she says of the latter (after she leaves) that her attire is scandalous. Mizu points out that Griselda's not that much better.
  • If You Ever Do Anything to Hurt Her...
    • When Zero is talking to Izuku about how the former's daughter Liana is interested in the latter, the older hero notes that, if Izuku ever breaks her heart, he'll regret it.
    • Sirzechs later gives a similar speech to Izuku about Rias. Apparently he's wanted to say that for a WHILE, but Rias was never really seriously interested in anyone before.
  • I Resemble That Remark!: At the USJ, Kirishima remarks to Tetsutetsu that it is rare to see Bakugo act calm and rational because normally he just shouts "DIE!" at the top of his lungs while scowling. Bakugo immediately fires that he is always calm and rational - shouting "DIE!" at the top of his lungs while scowling at them.
  • I'm Standing Right Here: When berating Izuku for his injuries after the Sports Festival, Recovery Girl notes that All Might is a terrible teacher. This is his response since he's in the room.
  • In Spite of a Nail: Despite the changes brought by the fusion of universes, there are still things that don't change.
    • The plot is kickstarted when Raynare attempts to kill the Boosted Gear holder before he discovers his true potential, and him getting resurrected by Rias.
    • The first arc is about Raynare's plot to steal Twilight Healing and Izuku's attempts to prevent it.
    • The Entrance Exam ends with Izuku destroying the Zero Pointer to save a trapped Ochako.
    • Riser Phenex forces the issue of his Arranged Marriage with Rias, prompting the Rating Game arc.
    • The USJ Battle still happens, only with Class 1-B also getting involved, the early appearance of Muscular, the Nomu being more powerful and the reveal that All for One knows about the Underworld.
    • The Excalibur Arc still follows the same plot, save for the intervention of the Port Mafia and the early appearance of Griselda Quarta.
    • All Might still offers Midoriya the chance to become the Ninth Torchbearer, which the boy accepts.
    • Several during the Sports Festival (which has the same events as in canon).
      • Izuku wins first place during the Obstacle Course.
      • Hatsume joins Izuku's Cavalry team on the basis of him being the first in the previous event.
      • Iida (who is in Todoroki's team) uses his Recipro Burst to allow Todoroki to take Izuku's team's headband.
      • Bakugo eavesdrops on Izuku's conversation with Todoroki and learns his secret.
      • Izuku and Shinso's combat is essentially the same as in canon, the only difference being how Izuku wakes himself up (instead of breaking a finger, One for All brings out the Boosted Gear so it will stab him in the leg).
      • Ibara quickly defeats her first opponent by grabbing them with her vines.
      • Ochako loses her first match, but it's against Tsuyu and she doesn't get to make as much of an impact.
      • Hatsume takes over the sound system to pitch in her tech during her match.
      • Todoroki covers the entire stadium with his ice in his first match.
    • For background characters, despite being in a universe where The Holy Britannian Empire does not exist, it appears that Lelouch Lamperouge, Kallen Stadtfelt/Kouzuki, and Shirley Fenette all know each other (and are in a relationship). Comments between Liana and Cynthia also imply the trio are friends with Milly Ashford and C.C.note , which is confirmed in a later chapter, which also confirms that C.C. is still immortal in this universe.
    • Most of the hero names and internships that the cast chooses, with a few exceptions like Izuku choosing Red Hero Dragon: Viridian as his hero name, for example, remain the same.
    • Izuku becomes inspired by Gran Torino's frozen taiyaki to develop his first One for All Super Move. Instead of Full Cowl, it's called Dragon Veil.
  • Instantly Proven Wrong: Nezu calls Rias, Sona, and Kudelia to his office. Kudelia wonders if he's onto them, but Sona replies that it's probably something involving their clubs. When they enter, Nezu shows them the video of the fight with Kokabiel. Kudelia sarcastically repeats Sona's comment.
  • Internal Reveal:
    • Kokabiel reveals to the Peerage that Momo is the daughter of Fallen Angel Baraqiel, something only Kyoka and her family knew.
    • Chapter 47 has Tenya, Shoko, and Setsuna learn about the supernatural world.
  • Interrupted Suicide: In Chapter 41, Izuku and Milia stop a girl named Fuyuko from killing herself by jumping off a bridge.
  • Irony: Hatsume just wanted to use her time in the ring to show off her gear, planning to step out of the ring as soon as she was done. She ends up winning because she hits Bakugo with a capture net when he attempts to fly at her: he gets so distracted that he ends up flying out of the ring.
  • Kansas City Shuffle: During the Rating Game, Yuuto sets up a trap that Riser's pawns see quite easily and avert it - making them drop their guard long enough to fall for the actual trap, which leaves them completely defenseless, allowing Yuuto to eliminate them.
  • Lamarck Was Right: Lampshaded in regards to Izuku being part dragon on his father's side since his father has a fire breath Quirk.
  • Laxative Prank: When Riser visits Rias as part of his attempt to force her to marry him, Momo slips enough laxatives into his cup of tea to last him for two days. They begin to take effect just before he leaves.
  • Lesser of Two Evils: Thanks to Mori's strategizing, the Port Mafia is legally in this position. By all accounts they are a criminal organization responsible for many crimes like drug trafficking and murder. However, Mori has made them so entrenched in Yokohama's foundation that, should anything happen to them, Yokohama will descend into anarchy. And since they already take care of other villainous factors due to threatening their business, the government is left with no choice but to let the Port Mafia do as it pleases.
  • Lethal Chef: Unlike Asia or Akeno, Ibara and Momo aren't very good cooks. Ibara once burned juice and added vinegar to chocolate for some reason (although fortunately she seems to be improving), while Momo's cooking is Chie and Yukiko levels of dangerous!
  • A Lighter Shade of Black: The unofficial stance the Japanese government has for the Port Mafia. Despite being a criminal organization, they exist in a legal grey area thanks to their leader, Ogai Mori, possessing a Quirk Business Permit, making the actions of the Port Mafia legal to an extent. And because they're so entrenched in the makeup of Yokohama, even if the government wanted to take them out, as the HPSC has tried seven times before, doing so would just send Yokohama into total anarchy, as the numerous malefactors kept in check by the Port Mafia's existence would be allowed to act unabated. So because they take care of lesser villains that would interfere with business and are technically a legal establishment, the government lets them act as they please to an extent.
  • Loophole Abuse: By all accounts, the Port Mafia is a criminal organization responsible for countless crimes including murder. Much like their home series however, the Port Mafia is in possession of a government issued permit that allows them to operate as they like. Not only that, but thanks to Mori's strategic mind, the Port Mafia has effectively become a lynchpin for Yokohama, meaning even if someone wanted to take them out, doing so would send Yokohama into total anarchy. As such, law officials have no choice but to let the Port Mafia keep existing, albeit they will arrest individual members like Kajii Motojirō if their actions go too far. This also hasn't stopped the HPSC from trying to take out the Port Mafia, at least seven times according to Yosano, but failed every time.
  • Luminescent Blush: This being Izuku, mixed in with the world of buxom beauties that is High School D×D, the result is the poor kid going red with regularity.
  • Make It Look Like an Accident: When Slidin' Go is tasked to kill Shujin's principal by the Meta Liberation Army, he's given explicit orders to ensure that the death is this or Never Suicide. He utterly fails in this as he stabs the man to death, making it too obvious that someone wanted to silence him.
  • Marshmallow Hell: After their first day at U.A., Rias decides to demonstrate how close she and Izuku are by burying his head into her bosom. She is actually quite prone to do this, particularly if she's shaken up or just wants to tease Izuku.
  • Massive Multiplayer Crossover: The story is ostensibly a Fusion Fic between My Hero Academia and High School DD, with most characters coming from either universe or being Composite Characters, while other series provide characters and world-building that are slotted in the story.
    • Bungo Stray Dogs:
      • The Armed Detective Agency investigate the serial killings committed by the rogue exorcists, leading to Dazai and Kunikida meeting the ORC and joining them in saving Ibara. Bakugo and Monoma later intern at the Agency, and in the process meet Atsushi, Yosano, Haruno, and Fukuzawa, a prior mention of the "White Tiger of Yokohama" suggesting Atsushi's recruitment was similar to canon.
      • After being spared, Raynare joins the Port Mafia, the group serving as recurring foes to the ORC aside from an Enemy Mine against Kokabiel. Mouri is also acquaintances with Azazel, as it's by his request that he sends Akutagawa, Higuchi, and Raynare to find the stolen Excaliburs and stop Kokabiel.
    • Blazblue: Celica is one of Kudelia's pawns and a hero student in 1-B. Her hero costume is her canon outfit with a witch hat.
    • Under Night In-Birth: Hyde is Izuku's classmate, and is secretly working alongside Seth and the Black Knight looking for "recruits", joining the ORC as part of his cover after helping fight Kokabiel. They didn't tell anyone else though, making them think the two just disappeared one day, up until Linne spots him in the stands amidst 1-A, and declares she's going to drag him back to Kanzakai.
    • Code Geass: One of the original characters in 1-A, Liana Kozuki, is the daughter of the No. 4 and 5 heroes, Zero and Guren, aka Lelouch and Kallen. She also calls Milly her aunt, mentions Cera, and has a half-sister named Cynthia Fenette, all but stating that Lelouch is not only married to Kallen but Shirley too. Liana and Setsuna later intern at the "Black Knight" agency, where Tamaki is shown to be working, and the implication that, like their origin, they act somewhat outside the law, as Zero and Guren are shown with a file investigating the HSPC.
    • Marvel Universe:
      • Ochako's old babysitter, Mizu, is a Kamar-Taj Sorcerer, and an apprentice to the Sorcerer Supreme Doctor Strange.
      • Pony's uncle is Phil Coulson, though instead of working for S.H.I.E.L.D., he works for U.N.I.T.
    • RWBY: Beacon Academy students appear at the Sports Festival in preparation for an international school tournament.
    • SLVR: Brandon and Lysette attempt to make a trade with Giran before spotting Mizu's group and fighting them.
    • Persona: Akihiko Sanada is a Pro Hero named Thunder Fist, and Fuyuko's school is Shujin Academy.
  • Megaton Punch: Izuku's first Finishing Move, Dragon Smash. He uses it against Riser to end him during the Rating Game, and again to break Kokabiel's nose.
  • Metronomic Man Mashing: Liana delivers one on Izuku during their match in the Sports Festival.
  • The Mole:
    • Vali and his team are double-agents for the Three Factions, entering the Khaos Brigade in order to know what Ophis' ultimate designs are.
    • Ingvild Leviathan is spying on UA and the ORC for a third party, apparently Doctor Doom.
  • Mom Looks Like a Sister: When he meets Venelana Gremory (Rias' mother) Izuku thinks she is Rias' sister, much to Venelana's amusement.
  • Mook Horror Show: In Chapter 55, many of the Khaos Brigade's Mooks end up regretting attacking the meeting at UA, particularly the ones that go after Itsuka with her uncle, as after her mother dies to save her and Itsuka unlocks her Balance Breaker, she goes to town on them in a rage. Izuku and Hyde actually hide behind a tree rather than help her because they're afraid of what she'll try to do to them if they try to interfere.
  • My Suit Is Also Super: As per canon, characters can get hero costumes that work with their powers with special treatment. Setsuna's is laced with her DNA so it splits with her limbs, while Izuku theorizes that Hagakure could get one that can be invisible by using her hair in the making.
  • Mythology Gag:
    • The first time Izuku and Ochako meet is when he trips and she uses her Quirk to prevent his fall.
    • Izuku and the others meeting with Dazai and Kunikida is a rehash of how the two met Atsushi in canon.
    • Riser is defeated when the Boosted Gear holder drenches him in Boosted holy water and gives him a Megaton Punch with a hand holding a cross.
    • Yura Tsubasa states she likes boys unafraid of getting dirty.
    • Rias' father originally wanted her to go to Kuoh Academy, which is where she and Sona studied in canon.
    • Koneko calls Ravel "fried chicken".
    • As seen in Naked Apron, the girls in Izuku's harem surprise him by welcoming him home only wearing an apron.
    • When Rias is note taking after seeing Izuku's reaction to the cheer-leading outfits, she has already written down "pole dancing" (Season 1's ending) and "belly dancing" (the second OVA) as additional ways to tease him.

    Tropes N-Z 
  • Naked Apron: In Chapter 30, Ochako and Ibara do this, on Aika's advice (and with Inko's help), when Izuku gets home. And then Rias joins them...
  • Noodle Incident: Ddraig once borrowed some of Tiamat's treasures for a fight against Albion, and they got destroyed in the fight. She's been hounding Ddraig ever since.
    • Mineta tried to sneak in Mt Lady's room during his internship, so she ended up making him do chores in a maid outfit.
  • No-Sell: Anti-Quirk effects like Eraserhead's Quirk don't have any effect on supernatural abilities or Sacred Gears, and vice-versa.
    • Kajii's Quirk makes him completely immune to explosions.
  • No Sense of Direction: Celica is so completely hopeless with directions that she managed to get second place in the Sports Festival Obstacle Course without knowing remotely how she got there, or anyone seeing her do it even though she apparently never left the track.
  • No Sense of Personal Space: Mei Hatsume, who chooses to put her face right in front of Izuku when she asks to join his Cavalry team.
  • "Not So Different" Remark:
    • Izuku tells Shinso he can relate to him wanting to be a hero despite everyone telling him he couldn't.
    • Kiba tells Iida a version of his Dark and Troubled Past that has the supernatural elements censored out to tell him how he also knows what it's like to seek vengeance for an attack on one's family.
  • Not What It Looks Like: When Rias finds Izuku in the same room as Setsuna, he has a hard time trying to explain that he didn't do anything. Something similar happens in chapter 39 when the girls see a naked Xenovia on top of Izuku, but here the girls realize what's going on and ask Izuku to leave while they berate Xenovia.
  • Oblivious to Love: Izuku is the only one in his middle school class that cannot tell that Milia Takamaki is nursing a big crush on him. He begins to take the hint when he gets to U.A., though. He's also unaware of how deep his feelings for Rias run.
  • Ocular Gushers: Inko doesn't even try and argue when Mitsuki says that she and Izuku can literally cry up a river. Mitsuki is later proven right when she visits Inko and nearly gets washed away by a literal river of tears.
  • Oh, Crap!:
    • Izuku when he notices the many Death Glares he's getting from his male middle school classmates as Rias Gremory escorts him to the school.
    • Ibara and Izuku when Dazai and Kunikida reveal they are investigating the murder scene they were at.
    • Mizu when Nezu shows her a recording of the fight with Kokabiel.
    • Irina when Rias asks her if she was serious about stealing Izuku's First Kiss.
    • Izuku, as well as Kudelia, Rias, and Sona all have this reaction when they find out from All Might and Nezu, respectively, that they two know that they are Devils.
    • When Recovery Girl mentions Gran Torino, All Might visibly blanches and starts panicking when the former threatens to call him.
    • Ddraig does this as well when Izuku considers interning with Ryukyu, the daughter of the Dragon King Tiamat, who has been hounding Ddraig because some treasures of hers that he borrowed got lost or destroyed when fighting Albion.
    • Both of them have this reaction when Tiamat surprises them with a visit while they are in the internship with Ryukyu.
  • One-Steve Limit: Momo Yaoyorozu has the same first name as Momo Hanakai from the Student Council. The latter is referred to by her full name to differentiate. Later we're introduced to Tamaki Amajiki/Suneater and Shinichiro Tamaki from the Black Knight agency, which can be a bit confusing since both are referred to as Tamaki and are introduced in the same chapter.
  • Only the Pure of Heart: Hauteclere can only be touched by those with a pure heart, which makes Izuku grabbing the blade and returning it to Irina after defeating Kokabiel significant.
  • Open-Minded Parent:
    • Save for a few hiccups, Inko is quite supportive of the girls living with them and of their building relationship with Izuku.
    • Downplayed, as although Endeavor believes that Shoto will be unable to hide the fact that she's actually a girl forever and thinks she should "stop pretending soon", he respects her decision to pass off as one enough to inform people like school officials to refer to her as one.
  • Orwellian Retcon: When the author changes an important plot point, he is not afraid of going back and modifying several scenes to fit with the change. The first time was with Momo no longer being the one to inherit One for All, the second was Shoto being a girl.
  • Overly-Long Gag: When Xenovia asks Izuku to make a baby with her, Izuku completely freezes up, and there's over an entire page worth of lines that just go "..." before he tries to make a break for it.
  • Parental Sexuality Squick: Izuku seems ready to find some Brain Bleach every time Inko mentions some of her adventures with Hisashi. It gets worse when Hisashi comes home, because Izuku knows how far their "catch-up sessions" can go.
  • Pervert Revenge Mode:
    • When Mineta leans his head on Tsuyu's bosom, Tsuyu grabs him with her tongue and slams him against the boat floor.
    • During the Obstacle Course, Mineta tries to use his Quirk to stick himself to Momo in order to reach the end of the race and grope her. Kido "accidentally" hits him with his sword while he is mid-air, knocking him back and leaving him to the (nonexistent) mercies of the Robo Inferno.
    • Izuku being a Nice Guy despite the Accidental Pervert situations ends up averting this trope more often than not, you can count on one hand where this is used on him:
      • During the Rating Game against Riser, Ochako and Koneko gets their clothes burnt in front of Izuku and Koneko tries to punch him.
      • After Izuku accidentally gropes her during their fight, Liana (temporarily) engages in this mode.
      • Averted in Chapter 39: when the girls find a half-naked Xenovia straddling Izuku, they can tell that Izuku is innocent, so they force Xenovia off and Rias asks Izuku to leave the room before they call Xenovia out for what she was doing.note 
      • Also averted when the girls overhear that Tiamat wants Izuku to be her daughter's mate. Once Izuku explains how the whole mess is Ddraig's fault, they don't blame him.
    • When Mineta attempts to peek on the girls while they are changing after the first post-internship Heroics lesson, Izuku painfully makes it clear that his attitude is unacceptable.
  • Polyamory:
    • Much like Issei in canon High School D×D, Izuku seems fated to have multiple girls falling for him. As of Chapter 52, the (incomplete) list is:
      • From High School D×D: Rias Gremory (main girl), Toujou Koneko, Ravel Phenex, Yura Tsubasa, Xenovia Quarta, Shidou Irina, Toujou Kuroka, Rossweisse, Le Fay Pendragon, Sona Sitri, Abe Kiyome, Ingvild Leviathan, and Yasaka.
      • From My Hero Academia: Uraraka Ochako, Yaoyorozu Momo, Jiro Kyoka, Asui Tsuyu, Ashido Mina, Hagakure Tooru, Shiozaki Ibara, Kendo Itsuka, Kodai Yui, Tokage Setsuna, Melissa Shield, Hatsume Mei, Hadou Nejire, Yanagi Reiko, Sosaki Shino | Mandalay, Tatsuma Ryuko | Ryukyu, and Usagiyama Rumi | Mirko.
      • Original Characters: Milia Takamaki, Liana Kozuki, Yukimura Fuyuko, and Kudelia Dantalion.
    • It's implied that this is the case with the Pro Hero Zero since Liana has an older half-sister at UA. Later confirmed, as said half-sister comments on their father and mothers' reaction to Liana's fight with Izuku.
  • Propaganda Machine: Shujin High School turns out to be one for the Meta Liberation Army; even making Destro's Meta Liberation War, the My Hero Academia version of Mein Kampf or Mao's Little Red Book, required reading.
  • Recursive Fanfiction: Heroes DxD: This is our story, having a similar premise, only with the addition of an OC, Samuel D. Sigurd, and adding Kingdom Hearts and Infinite Stratos.
  • Refusal of the Call: Mirio Togata chooses not to accept One for All, as he wants to become a hero on his own terms. This leads All Might asking Izuku instead.
  • Retcon:
    • Originally, Momo was the one All Might chose as his successor, but per Word of God she already had three power sets (Quirk, Fallen Angel, and Devil Queen), which would have made her overpowered and considering the recent revelations of One for All in canon, it was wise to give it to Izuku. While he does have his draconic inheritance and Boosted Gear, these powers are supernatural, which means that Izuku is still Quirkless, so he can use One for All without suffering its biggest drawbacks.
    • Something similar happened after The Reveal that Todoroki is female.
    • After the negative backlash from the scene where the girls see Xenovia trying to force Izuku to have sex with her and they engage in very misguided Pervert Revenge Mode, the author changed it to have them harshly calling out Xenovia for what she was doing.
  • Revealing Cover-Up:
    • Slidin Go's attempt to make the murder of Shujin's principal look like a suicide only ended up furthering Zero's suspicions. Combined with the school assigning the Meta Liberation War book as required reading, it ensures a deeper investigation is inevitable.
    • Nezu and Coulson are deeply suspicious of the circumstances of Lady Nagant's arrest and trial, especially since she was denied the chance to speak to anyone while in prison and in her transfer to the Raft despite her crimes not warranting such a fate.
  • Running Gag:
    • Bakugo coming up fifth in individual competitions. When it happens in the midterm exams, he lampshades it.
    • Izuku finding one or multiple girls sharing his bed.
    • Izuku pulling out a notebook out of seemingly nowhere when he wants to take notes.
  • Samus Is a Girl:
    • Todoroki's gender is revealed to the audience in-universe at the Sports Festival when the final clash between her and Izuku's attacks causes Clothing Damage and exposes one of her breasts, though besides Izuku (who found out earlier), Mineta and Kaminari, all of 1-A had already figured it out, and only avoided mentioning it to be polite.
    • The end of the Sports Festival Arc reveals the cloaked Mysterious Watcher who tipped the police off to the USJ attack, saved Iida, and directed Hyde to aid the ORC against Kokabiel is female, and someone that the Black Knight knows.
  • Saying Too Much:
    • When Izuku, Ibara, Kyoka, Momo, and Ochako meet Dazai and Kunikida and they mention the previous night's murder, Ibara lets out her horror at a priest being behind it - something the detectives had not even mentioned.
    • Sagimoto, one of the detectives investigating Detective Yamigiwa's murder, mentions how someone shot her twice after killing her just to make it look like a Port Mafia hit. This allows Ranpo and Bakugo to instantly pinpoint him as the killer, as the body was just fished out of the river - no way anyone that was not involved would know the exact sequence of the shooting.
  • Secret Secret-Keeper:
    • All Might reveals in chapter 32 that he knows nearly all the Occult Research Club members are devils, as he's been the target of attempted recruitment multiple times and can tell the signs.
    • Almost all of Class 1-A knew Todoroki's real gender, with Izuku, Mineta and Kaminari only learning about it during the Sports Festival. According to them, it wasn't much of a secret due to Todoroki giving out too many hints.
  • Sent Into Hiding: Slidin' Go is forced into this after royally screwing up in his attempt to kill Shujin's principal and the MLA considers him too valuable to just dispose of.
  • Shipper on Deck:
    • Tiamat wants Izuku to be her daughter's mate.
    • Azazel teases Bakugo and Mittelt.
    • Azazel later teaes Vali and Genbu Doumon.
  • Smooch of Victory: Rias gives Izuku several deep ones after their victory in their first Rating Game.
  • Spanner in the Works: Ibara sneaking a vial of holy water and a cross into the Rating Game proves vital for Izuku's plan to defeat Riser by exploiting devil's weaknesses to both, making him lose his regenerative power in a critical moment and allowing Izuku to knock him out.
  • Spared by the Adaptation:
    • Rias, after asking for Izuku and Ibara's opinion, spares Raynare here. She then joins up with the Port Mafia and returns during the Entrance Exam and the Excalibur of the Moonlit Schoolyard Arcs.
    • Mittelt was spying on Raynare for Azazel here, so she leaves Raynare's group before Rias takes them out.
  • Spider People: Lailah is a sadistic angel woman whose Quirk gives her spider abilities and traits.
  • Stealth Hi/Bye: The entire Armed Detective Agency bolts when Doctor Yosano shows up to find someone to go shopping with, leaving Bakugo, Monoma and Atsushi to their luck.
  • Story Arc: As a Fusion Fic between both worlds with a few extras, the story changes over between one and the other:
    • Chapters 1-6 are the Diabolos of the Old School Building Arc (Raynare and Ibara/Rise of the Red Dragon Arc).
    • Chapters 7-14 are the Entrance Exam Arc.
    • Chapters 15-18 are the Phoenix of the Battle School Arc (Riser Phenex Rating Game Arc).
    • Chapters 19-25 are from Quirk Apprehension Test to the USJ Arc.
    • Chapters 26-31 are the Excalibur of the Moonlit Schoolyard Arc (Excalibur/Holy Sword Arc).
    • Chapters 32-38 are the Sports Festival Arc.
    • Chapters 39-48 are the Field Training/Internships/Hero Killer Arc.
    • Chapters 49-?? are the Vampire of the Suspended Classroom Arc (Peace Conference Arc).
  • Sucky School: As in canon, Shujin Academy is this. Fuyuko is beset by rumors slandering her as someone who sleeps with teachers for better grades, and when she thinks she's found someone willing to help her in volleyball coach Ushishiba, the man starts to manipulate her in an attempt to turn her into his personal maid, while the principal dismissed her accusations. It got so bad that, when Uchishiba ordered her to come to his apartment for obvious reasons, Fuyuko decided to commit suicide, hoping that at least that would cause the school to fall under investigation. It's also secretly under the influence of the Meta Liberation Army.
  • Superior Successor: Izuku is shaping up to be this to All Might, which the latter even lampshades.
  • Supreme Chef: Rias, much like in canon.
  • Taking the Bullet: Ibara has done this twice already in the story: the first to save Izuku from being impaled by one of Raynare's light spears and the second to protect Rias from Riser's attack in the Rating Game.
  • The Talk: After seeing Izuku sleeping in the same bed as naked Rias, Ochako, and Ibara, Inko insists on giving her son a crash sex-education course. Izuku is left pale and scared at how graphic his mother went - and the fact that she's not done yet.
  • The Tease: Rias loves to tease Izuku, because she likes his reactions to it and because she likes him.
  • Training from Hell: To prepare for the Rating Game, Mizu calls in a favor from Tannin, the Devil Dragon, who takes Izuku to another dimension where Izuku essentially suffers through one month of torture to become a stronger fighter.
  • Underestimating Badassery: Riser makes the mistake of thinking Rias' Peerage will be unable to defeat him, being particularly insulting towards Izuku. During the Rating Game, not only does Rias' Peerage defeat his, Izuku destroys Riser in a melée fight.
  • Uneven Hybrid: Izuku has dragon ancestry. According to Ddraig, he's about 1/16 dragon (one of his father's great-grandparents was one).
  • Unexpected Character: Chapter 51 introduces a character no one was expecting, a non-All For One Hisashi Midoriya that didn't abandon his family. Though it was alluded to many times and that he was simply too busy to come home, the fact that he was able to take time off for Parents' Day was such a surprise, both In-Universe and out.
  • Welcomed to the Masquerade: As more and more students and faculty inadvertently get involved with the Supernatural, rather than having their memories wiped, they are instead told about it as the possibility of the Khaos Brigade and the League of Villains joining up is rather high, especially with a rogue angel in the latter group.
  • Wham Episode:
    • Chapter 25. Izuku achieves Balance Breaker, All Might is planning to give One for All to Izuku, the League of Villains is aware of the hidden world, the Nomu may have been a member of the Phenex Family, and Irina and Xenovia enter the story just as they are assigned the mission to find the stolen Excalibur swords.
    • Chapter 29. Lailah is an angel who's using a loophole to avoid Falling despite being an unrepentant Serial Killer, and her spider traits come from a Quirk, strongly implying there's a connection between her and All For One.
    • Chapter 31. The heroes learn that God Is Dead, as well as Momo's father being a Fallen. Xenovia joins Rias' peerage in response to the former. Nezu reveals to Mizu that he knows of the magical world and has footage of the fight with Kokabiel. Izuku decides to accept One for All after the White Dragon Emperor easily takes down Kokabiel. And Kokabiel is killed in Cocytus before he can reveal who is behind the conspiracy to kickstart the war and supported him.
    • Chapter 35. Todoroki confirms that she's a girl after a Freudian Slip.
    • Chapter 38. Lailah tracks downs Stain after he attacks Iida's brother, and then both of them are tracked down by the League of Villains, Todoroki's gender is revealed at the end of her fight with Izuku, and the Black Knight meets the Mysterious Watcher who's been aiding the heroes, who's apparently a girl that he knows.
    • Chapter 45. Ravel's missing brother is confirmed to be the original Nomu. One of the other Nomu uses Kitsune fire, proving that the League uses other magical beings in their experiments. Lailah tastes Itsuka's blood and realizes that she isn't entirely human.
    • Chapter 47. Iida, Setsuna, Liana, and Todoroki learn that Izuku, Milia, and Itsuka are Devils and that God Is Dead. Itsuka apparently has Fake Memories and has a strange reaction to the name Asmodeus.
    • Chapter 51. While mainly a Breather Episode, there are a few noteworthy plot developments, namely Shigaraki being informed that Overhaul has a significant bounty out on information regarding his "daughter", Yasaka and Kunou making an appearance, Giran being paid by a girl in a hood to locate several villains using what is implied to be broken Evil Pieces, Izuku and a large number of the girls interested in him admitting their mutual feelings for each other, and finally Izuku's father shows up.
    • Chapter 53. Like Chapter 51 there are many less serious moments, but it has Gasper being unsealed, Mina, Toru, Tsu, and Yui all learning about the supernatural, Ibara learning more about her Sacred Gear's limitations and vowing to study medicine under Recovery Girl, partly in the hopes that by actually knowing what her power is doing she'll be able to bypass those limits, Ingvild reveals her true identity as a half-Devil of the Leviathan family to the group, Itsuka remembers that her mother was from the Asmodeus clan, which Azazel had hinted at earlier, Reiko summons Izuku and Gasper, and the Old Satans faction learn of Ingvild and Itsuka's existences and plan to kill them, with a woman who seems to be Itsuka's supposedly deceased mother under their control.
  • Wham Line: At the end of Chapter 39, Izuku, Rias, Ochako, & Ibara stumble onto a scared little girl. When Izuku is able to calm her down enough to get her to give her name:
    Eri.
  • Wham Shot:
    • When the Nomu's injuries regenerate, they do so by flaming up - just like the members of the Phenex Family.
    • Bakugo accidentally finds Freed Sellzen while he kills a priest.
  • What the Hell, Hero?: Rias reads Xenovia the riot act after she tries to rape Izuku (although her actions are mostly born out of ignorance, since her sheltered life and lack of social skills didn't help her realize that Izuku was genuinely scared).
  • Where Does He Get All Those Wonderful Toys?: Multiple times during the Sports Festival various students wonder how U.A. affords/makes stuff like the Zero Pointers and the Obstacle Course.
  • Xanatos Speed Chess: Izuku defeats Riser by planning for several contingencies, bringing out the next plan when one fails to do the deed until Riser is just unable to react.
    • First, he uses Flame Delete to nullify Riser's fires: this ensures that his injuries cannot regenerate so easily.
    • Then, Izuku gets closer to attempt to knock him out, only for Riser to grab him and attempt to throw him off the roof, so Izuku just grabs Riser so he will also fall off the roof.
    • Riser tries to choke Izuku, threatening to kill him if Rias doesn't surrender. Izuku had planned for that, though, because he needed Riser to be angry and close enough he wouldn't see Izuku getting Ibara's holy water bottle out of his pocket and Boosting it before smashing it on Riser. Weakened by the empowered holy water, Riser becomes overwhelmed by Izuku, who wraps Ibara's cross around the Boosted Gear, and Dragon Smashes Riser into a wall, hurting him beyond his diminished regenerative ability and forcing Riser to retire.
  • Year Inside, Hour Outside: The dimension Tannin trains Izuku in is stated to go one hour outside one month inside.
  • You Called Me "X"; It Must Be Serious: Endeavor tries to do this by calling his daughter her real name, "Shoko", but she ignores it.
  • You Have Outlived Your Usefulness: Someone murders Kokabiel in Cocytus as a precaution against anyone getting information out of him about their involvement in things.

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