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Fanfic / My Hero Academia: Unchained Predator

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And he shall be joined by another. One whose rage, strength and ferocity equal his own. Together they will rain destruction, death and devastation upon all they deem evil...note 

They are justice, integrity, courage.
They are the embodiment of hope and peace.
Your enemies are rage, brutal, villainous, without mercy.
But you?
You will be worse.
Rip and Tear until it is done.
-Unknown, Intro to My Hero Academia: Unchained Predator'

My Hero Academia: Unchained Predator is a triple crossover fanfic between My Hero Academia/Doom (2016)/Darksiders written by reeleffendeel.

Following the conclusion of DOOM 2016, the Doom Slayer is warped into a world of Heroes and Villains. But when the Demons invade the alternate world, the Slayer's crusade against Hell will lead him to different worlds and revelations alongside newfound allies...and their guardian Angels.

My Hero Academia: Unchained Predator provides examples of:

  • Acquired Poison Immunity: Doom Slayer is unaffected by Midnight's sleeping gas since he has long since adapted to breathing Hell's noxious and deadly atmosphere.
  • Adaptational Badass:
    • The Doom Slayer himself gets an ample helping of this. While already incredibly badass in the canon Doom (2016) universe, here he destroys a literal black hole with his bare hands and takes on multiple top-level Heroes with nary a scratch; only All Might actually damages his armor, yet he ultimately falls to the Doomslayer as well.
    • The League of Villains gets this treatment, with the Steel Sabers arc revealing that they have more members than in canon, with one of them being responsible for decimating Esuha City. It has been revealed that they also got access to the last known cache of VX Gas on the planet.
    • VEGA receives this too. In canon, he was mainly a Mission Control Non-Action Guy for most of the story, whereas he actively helps the Slayer in many different ways here in this story, from hacking the mainframe of I-Island, cutting off all communication from both the heroes and the villains to taking control of several drones to kill several Sabers soldiers. One scene, in particular, has VEGA fighting side-by-side with Doomguy against the remaining Sabers while controlling a large mech.
  • Adaptational Early Appearance:
    • The story takes place during the last parts of the Final Exams Arc. Nine, along with his sidekicks, make a cameo in Chapter 8 before they actually appear in Chapter 12. Their true debut didn't happen until My Hero Academia: Heroes: Rising, which takes place after the Meta Liberation Army Arc, not to mention the film after the first film (which is where the Steel Sabers arc takes place).
    • Mirko appears in Chapter 3, while Hawks, Crust, and Ryukyu show up in Chapter 10, well before their actual debut in the Pro Hero Arc.
    • Fatgum appears in Chapter 4, while in canon he appeared during the Shie Hassaikai Arc.
    • Lady Nagant appears at the end of chapter 12 when she wouldn't appear until the Villain Hunt Arc.
  • Adaptational Heroism: The Hero Public Safety Commission receives this. In canon, they were revealed to be totally corrupt and their previous director used Lady Nagant as an assassin to kill everyone who was suspected of villainy or interfered with their objectives. Even after being replaced by his successor, the HPSC was still only somewhat less corrupt. In here? While the author stated that they are not 100% clean by any means, they haven't committed any of the horrific things they did in canon and want to genuinely help everyone in Japan.
  • Ain't Too Proud to Beg: A Saber called Marley begged the Slayer to not kill him, promising him that he would turn over a new leaf. This not only failed, it infuriated the Slayer even more, as all he could think of were those who probably begged this same soldier not to kill them.
  • All Myths Are True: Heavily implied by several of the Christian angels who frequently mention gods and beings from other pantheons.
  • Alternate Universe Fic: Aside in a more literal sense as the Hero Academia world is stated to be an alternate universe to that of the Slayer's home universe, it becomes evident that both universes differ somewhat from their source material:
    • Nine in this universe leads the Steel Sabers, a deadly mercenary group that is known for killing over 246 heroes and is hired by Wolfram to help him to take over I-Island and his name is based on the age where he killed his first Hero.
    • Lady Nagant became a Vigilante and never went to prison, but given the Hero Public Safety Commission isn’t anywhere near as corrupt as they are in canon, it makes one wonder what made Lady Nagant go rogue compared to her original counterpart.
    • Oboro Shirakumo isn't dead, so he doesn't get turned into Kurogiri, who in here is just another subservient Nomu.
    • Mirko in this universe is implied to have a darker past than in canon, as unlike in canon when she was simply the punk vigilante Tiger Bunny who snuck into several illegal fighting tournaments and got kicked out of several schools before becoming a top Pro Hero, here her old vigilante persona is implied to be much more violent as she used brutality and a shotgun against villains and criminals alike before being rehabilitated into the bunny hero Mirko. But it seems remnants of her past have begun to leak out from the Doomslayer’s presence.
  • A Mind Is a Terrible Thing to Read: Ragdoll gets a lot more than she bargained for when she mind-scans the Doom Slayer.
  • An Arm and a Leg: During their confrontation at the mall, the Slayer rips Shigaraki's arm out of its socket and begins beating the villain with it. Initially, the arm can't be recovered due to police scrutiny, but All For One's forces manage to steal it from lockup while the nation is distracted by the Slayer's battle against the Steel Sabers.
  • Anti-Hero: The Doom Slayer takes up this role easily. He may brutalize villains but doesn't dare attack innocents. If anything he becomes even more savage to any villain who dare hurts an innocent person in his sights. And the few run-ins with pro heroes were provoked by them and even then, he only aimed to incapacitate them. His Start of Darkness appears to have been getting reassigned to Mars in his early days after assaulting a superior officer for trying to open fire on civilians.
  • Armor of Invincibility: Thanks to the Slayer's armor being forged by a rogue Demon known as "The Wretch" and then enhanced by the UAC’s technology, bullets shatter like glass against him and explosives barely make him stagger. It even stands up to Endeavor's flames. That being said, All Might has proven capable of denting it albeit only with his strongest attack.
  • Asshole Victim:
    • You can't feel bad for Shigaraki after the Doom Slayer rips his arm off and starts beating him with it. Unfortunately, Dabi saves him before the Slayer can finish him off.
    • The Steel Sabers, under the command of Nine and his lieutenants, kill heroes for a living and to some degree sport, so it's hard to feel bad for them once the Slayer makes them pay for every hero they killed. Even a few of the Heroes such as Mirko and Ryukyu quietly muse that the Slayer did the world a favor by wiping them out, with their allies in the League of Villains not sad to see them go either.
    • Wolfram dies in Chapter 19 and he deserved it after becoming a crazed psycho (even more so than before) with the Quirk Amplification Headset.
    • Arbalest and Skullbash are killed with their men after the Slayer catches wind of their operations, but given how they were happy to murder people and do a lot of horrible things in All for One's name, they had their deaths coming for them.
  • Ate His Gun: The Doom Slayer kills Nine this way by shoving the barrel of his own Taurus Raging Judge revolver into his mouth.
  • Back-to-Back Badasses: VEGA hacks into a mech and starts helping the Slayer by attacking the Sabers with it.
  • Bad Boss:
    • Nine, who was not in a very good mood, kills a Steel Sabers mercenary for not considering using the stairs when the elevators are shut down by the EMP.
    • Wolfram abandons his few surviving mercs to the Doom Slayer as he attempts to make his escape from I-Island.
      Curator: Didn't you just say to your dogs that we were going to wait for them?
      Wolfram: Screw 'em.
  • Benevolent A.I.: Same as in the games, VEGA (in his suit) serves as the Doom Slayer's main ally, gathering information and guiding him on his course. Mind, that's just benevolent to the Slayer. To his enemies, on the other hand...
  • Berserk Button: The Slayer is not pleased when the League of Villains tries to harm Miruko due to her reminding him of both his deceased wife Emily and his dead rabbit Daisy. Wolfram is stupid enough to smash it after he impales Miruko with rebar on I-Island.
  • Beyond the Impossible: The Slayer in chapter 21 manages to catch and crush a BLACK HOLE sent from Thirteen. In the same chapter, All Might manages to actually dent parts of the Praetor Suit. This earns him more respect from Taggart for being able to harm him to begin with.
  • Big Bad Wannabe: The author actually puts All for One here. In canon, he was the Big Bad and Greater-Scope Villain of the story, but in the fic, the author states soon he will be writing checks he won't be able to cash, which all but means that once the demons come, he'll be nothing more but an afterthought. And it’s very doubtful AFO would be trying to make deal with the Demons or the Makyr’s, let alone be successful. But it’s quite likely that Shigaraki will end up in the same boat if not slightly worse off.
  • Big Damn Heroes:
    • Miruko arrives at the I-Island central tower's rooftop just in time to aid Izuku's group against the League of Villains in chapter 17.
    • The Doom Slayer makes his Dynamic Entry from the elevator shaft of I-Island's central tower just as Miruko's about to Hold the Line against the recovered League of Villains operatives to help Izuku's group and Melissa Shields escape.
  • Blood-Splattered Warrior: The Slayer is coated in the blood of his enemies after killing thousands of Sabers in Chapter 15.
  • Bloodier and Gorier: Like you won't believe. The Doom Slayer single-handedly inflicts this trope upon the world of My Hero Academia with his unrelenting brutality against villains.
  • Blue-and-Orange Morality: Doomslayer has been long desensitized to the violence he inflicts against any threat to innocents thanks to his long crusade against Hell. While the Heroes recognize that Slayer has enough sense to hold back against them, the slaughter Slayer leaves in his wake is far too much for any of the cast to stomach, his propensity for violence is simply unheard of and the body count following the I-Island bloodbath is higher than most heroes see in their whole careers. The only person in the MHA-verse who even remotely has a clue to the reasons behind Slayer's brutality is Ragdoll, and her mind snapped like a twig after trying to read his. and it literally took an archangel to restore her mind from the damage seeing into the Doomslayer wrought on her sanity.
  • Break the Cutie:
    • Ochako was so traumatized by seeing the Doom Slayer rip Shigaraki's arm off that she developed PTSD. Things get worse for the Zero Gravity user when she and the other captives on I-Island have to walk through the rivers of blood that the Slayer left behind when he killed the Steel Sabers.
    • Ragdoll is left screaming in fear after she looks into the Slayer's mind and sees his war against Hell. The poor girl was about to tear into her head until Midnight knocked her out and by her next appearance, she's a traumatized wreck.
  • Break Them by Talking: Curator gives one to David about how his fanaticism towards All Might led to I-Island being taken over by the most dangerous mercenaries in the world and putting everyone in danger, including his daughter. When he's done, Melissa can't even look at him.
  • Boom, Headshot!: How Nine meets his end in chapter 16.
  • Bullet Catch: A tank gunner fires a shell at the Slayer in a desperate attempt to kill him. Slayer just ends up catching it with one hand.
  • Cape Busters: The Steel Sabers were mainly trained to fight against Heroes by learning their Quirks and weaknesses for years. Knowing that they managed to kill 246 Heroes before I-Island, it was safe to say that they were pretty effective before the Slayer crossed their path.
  • Calling Your Attacks: The Doom Slayer mentally lampshades the ridiculousness of this trope after he has to constantly listen to the heroes constantly yell out the names of their attacks during their brawl on I-Island and swiftly gets tired of that habit.
  • Creepy Good: The Doom Slayer qualifies with his brutality and his unshakeable morals.
  • Crisis of Faith: Flynn Taggert used to be a devout Catholic back on his homeworld before his war against hell. His encounter with the Maykrs has severely damaged his faith and can only wonder if the angels of the MHA universe are any different.
  • Cruel and Unusual Death: This story is a crossover between Doom and My Hero Academia, and people will die in brutal ways, though some deaths stand out the most.
  • Curb-Stomp Battle: The Slayer hands these out left and right to not only villains but also any heroes unlucky enough to try and slow him down. In fact, the story's Establishing Series Moment is him all but eviscerating Shigaraki in Chapter 5.
    • Chapter 10 has him facing Eraser Head, Slidin' Go, Mr. Brave, Loud Cloud, Mirko, Hawks, Fatgum, Crust, Gran Torino, Ryukyu, and Endeavor. He isn't even slowed down for a millisecond as he bulldozes through them
    • The Steel Sabers on I-Island get to be victims of an extremely one-sided fight against him, throwing everything they had at him to no effect. Two Sabers manage to operate construction mech suits to try and kill the Slayer... only for the suits to be dismantled so easily that he was actually disappointed at how easy they were to beat.
      Well that was pathetically easy. The Hell Guards were way tougher than these cheap knockoffs.
    • Swordkill, Nobu, and Daigo are quickly and brutally killed by the Slayer.
    • Endeavor tries to attack the Slayer after the Steel Sabers are exterminated only to get the shit beaten out of him with laughable ease. The rest of Endeavor's team tries their luck against the Slayer again. It goes much worse than last time, ending with every one of them defeated.
    • Arbalest and Skullbash's gangs are wiped out by the Slayer after they begin their terrorism campaign on All for One's orders.
  • Curb-Stomp Cushion:
    • At first, the Saber leaders manage to disorient the Slayer and even destroy his Great Communicator. But once they lose the element of surprise, he goes right back to work.
    • Thirteen's Desperation Attack. While the Slayer inevitably stops it - it actually makes him feel caution (a first for any MHA ability), and explicitly takes all his strength to do so (another first).
    • The fight between All Might and the Slayer still ends with the latter's victory, the former ends up denting the Praetor Suit and giving the Slayer some damage under it.
  • Darker and Edgier: What happens when you put the demon-killing machine known as the Doom Slayer in the world of My Hero Academia? You get this story, and it hasn’t even gotten to when the demons of DOOM begin to invade this alternate earth...
  • Dark and Troubled Past: Mirko in this alternate timeline was apparently, at one point, a hyper-violent vigilante who hunted criminals with a shotgun and a tiger-patterned Luchadore mask. When met with scenes of extreme violence, she finds herself torn between absolute horror at the reminder of who she once was and bloodlust.
  • Decomposite Character: Oboro Shirakumo and Kurogiri are two separate people.
  • Deconstruction Crossover: Doomguy's ultraviolent methods in how he handles villains and criminals deeply horrified and traumatized everyone, both children and adults. Even though the Slayer's victims are villains and criminals, and he never harms the innocents, the Pro Heroes and law enforcers however see him as a very dangerous serial killer who must be stopped.
  • Desperately Looking for a Purpose in Life: The Slayer feels lost for a while, not knowing what to do with himself besides killing criminals. When VEGA learns of All For One and tells him about him, the Slayer decides his purpose is to hunt him down and terminate him until VEGA can build a way back to his universe.
  • Dies Differently in Adaptation: Instead of getting killed by Shigaraki, Nine dies by the Slayer's hand.
  • Dirty Coward: Slidin' Go backs out from fighting the Doom Slayer by lying to the Heroes that he would stay behind to watch and protect the civilians and Ragdoll. In reality, not only is he aware that going against the Slayer would be outright suicide due to what happened to the Steel Sabers, he wants to relay information about the Slayer's activities to the Meta Liberation Army.
  • The Dreaded: The Slayer was already this to the demons, but he earns a frightful reputation through his patented blend of ultraviolence. His first encounter with Shigaraki and Dabi leaves the normally smug villains scared shitless. And in the aftermath of slaughtering the Steel Sabers, thousands of fully trained hero-killing mercenaries that were holding everyone on I-Island hostage, leaves most Heroes and Villains in Japan outright fearful of him. Even All Might's blood ran cold while having to watch the I-Island bloodbath, noting that he's never seen such a level of savagery in his long career as a hero. This even extends to The Ascendant Realm and the Prime Council, who initially thought the Slayer was a myth and when he's confirmed to be real, both are at a loss as to what to do with him.
  • Dynamic Entry: The Doom Slayer arrives on the rooftop where the VX Gas warhead is located by using an elevator car to slingshot himself up the shaft the car is in during chapter 17, punching through the roof in the process.
  • Enemy Rising Behind: The Doom Slayer comes right behind three Steel Sabers mercenaries making a televised demand to the public. They remain ignorant of the Slayer's presence - as Nine cannot warn them since VEGA had shut down their communications - until he pulls out his chainsaw in full view of everyone watching.
  • Everyone Calls Him "Barkeep": Because no one has any idea who the Slayer is, let alone his actual name, everyone merely calls him "The Vigilante".
  • Everyone Has Standards:
    • Everyone is flat-out horrified by the sheer violence the Slayer dishes out upon his targets, even if they had it coming.
    • In Chapter 26, a reporter crew from America barges into the hospital Izuku and the others are at and starts questioning him even though Izuku is clearly not in the mood and severely traumatized from what happened on I-Island. Aizawa arrives and threatens to give the reporter a colonoscopy with their camera if he doesn't screw off.
  • Evil Wears Black: The Steel Sabers wear pitch-black uniforms.
  • Face–Heel Turn: Nomura, formerly known as the Semtex Hero C4, now works for All For One after being betrayed Hero Society.
  • Facepalm Of Doom: The Doom Slayer non-fatally grabs Midnight's face and pulls her inside Cementoss' prison before knocking her out.
  • The Friend Nobody Likes: Despite being affiliated with the League of Villains, Wolfram and his men were not on friendly terms with the other LOV members such as Dabi, C4, Muscular, Magne, Mr. Compress, and Mustard. After learning about the deaths of Wolfram and his underlings at the hands of the Slayer, the LOV members expressed their contempt on their so-called comrades.
  • Go Mad from the Revelation: Ragdoll attempts to mind-scan the Slayer to pinpoint his location on I-Island. Needless to say, looking into the Slayer's Dark and Troubled Past has not been conducive to her sanity. After the events of I-Island, Ragdoll began drawing pictures of the Slayer, his Mark, and the demons along with inscribing "the only thing they fear is him" over and over while recovering in the hospital. The only reason her madness wasn't permanent was because the Archangel of Dreams Jeremiel, with the backing of the Creator, later relieved Ragdoll of the visions plaguing her.
    Ragdoll: IT CAME FROM HELL! IT CAME FROM HEEEEEEEEEELLLLLLL!'
  • God's Hands Are Tied: The Ascended Realm and the Prime Council have willingly chosen to distance themselves from human affairs some time ago, with The Creator only allowing a "one miracle per mortal" policy.
  • Gorn: Every single encounter between the Doom Slayer and any of the villains results in this, usually taken to the extreme. In the later parts of the Steel Sabers arc, the streets of I-Island are literally choked with blood, and plenty of scenes show him tearing out spines and crushing skulls in terrifyingly brutal fashions.
  • Green-Eyed Monster: Bakugo is left furious over Yagi/All Might having chosen Izuku as his successor. Although Yagi explains his reasons for why he picked Izuku, Bakugo angrily retorts that Yagi chose Izuku for being better than him.
  • Grew Beyond Their Programming: The Slayer notices that since arriving in the MHA Universe, VEGA has begun to show more signs of initiative and drive, almost like the Artificial Intelligence is beginning to evolve and become more like a real person than an actual machine.
  • Grievous Harm with a Body:
    • Doom Slayer tears off Shigaraki's right arm with his bare hands as part of his brutal beatdown on him during his Curb-Stomp Battle against the smug supervillain in the Kiyashi Ward shopping mall.
    • During his attack on the Steel Sabers, the Slayer picks up a Saber soldier by the leg and uses him as a club.
  • Hero with Bad Publicity: While far from a traditional hero, Slayer ends up on the shitlist of both sides of the law by the end of the I-Island fiasco, the League of Villains want him dead for nearly killing Shigaraki and the Heroes intend to capture him for butchering the Steel Sabers while rescuing civilian hostages, unintentionally destroying Ragdoll's sanity and beating down the Heroes sent to apprehend him. The only reason the Heroes aren't focusing solely on him is because of the chaos caused by so many Pros being out of action after I-Island.
  • Heroic BSoD: When Bakugo discovers All Might in his emaciated state and learns how said hero is losing his powers, he becomes far more withdrawn and taciturn.
  • Hoist Hero over Head: Heroic example. The Doom Slayer hoists Mummy and breaks him in half over his knee. He then throws Mummy's upper half into a pile of debris that spears into his face.
  • Honor Before Reason:
    • The heroes in MHA have moral codes, so it's expected that a lot of them aren't going to accept the Slayer's actions, much to his chagrin. The Slayer inverts this hard due to his eternal war against the forces of Hell desensitizing him to all forms of violence, and the moral codes of the Heroes confuses him more than anything. In short, he would rather take out any threat to innocent life immediately than leave it to the authorities and pro-heroes. This is demonstrated when he nearly kills Shigaraki and Dabi if not for Kurogiri's Warp Gate teleporting them at the last minute.
      • While Shigaraki, even while the story begins at the end of MHA's second season, has done nothing but cause pain for Class 1-A and is the de facto leader of the League of Villains, both Izuku and Tenya stand up to Slayer during the Mall incident to demand him not to execute the nearly dead Shigaraki.
    • During Chapter 13, Nejire and Tamaki try to stop him from killing the Steel Sabers until they decide that making sure the hostages are safe is more important.
  • Hostage Situation: Wolfram's last remaining mercenary, who is cornered by the Doom Slayer, desperately points his gun at a detained All Might and orders the Slayer to stay back. However, the Slayer quickly punts a chair into the gunman's face before he could pull the trigger, causing him to drop his weapon and allowing the Slayer to gruesomely finish him off.
  • Immune to Fate: Usiel and the seers from the other pantheons ultimately discover the Slayer's fate is completely unwritten and seems to have the ability to alter the fate of those around him. Word of God confirms this was inspired by Goblin Slayer's seemingly ability of "not letting anyone roll the dice".
  • Improvised Weapon: During the earlier parts of the I-Island assault, to be stealthier, the Slayer makes use of some saw blades, rebar, a sledgehammer, and a fire axe, all to deadly effect. He also ends up using a turret from an APC against the Sabers when he goes loud.
  • "It" Is Dehumanizing: Near the end of the Steel Sabers arc, Mummy states that most of the Steel Sabers are dead because of the Slayer, or as he put it, that thing.
  • It's Personal:
    • Both Shigaraki and Endeavor don't take their defeats at the Doom Slayer's hands gracefully. The former later throwing a COLOSSAL tantrum over how the Doomslayer nearly killed him.
    • The Doom Slayer takes quite some offense at how the Steel Sabers not only kill heroes but desecrate their corpses.
    • In chapter 19, seeing Miruko being (thankfully non-fatally) impaled throughout her body by Wolfram reminds The Slayer, or rather, Flynn, of the moment he lost his family and pet rabbit Daisy, causing him to go BALLISTIC on Wolfram.
  • Innocence Lost: After witnessing the Steel Sabers and The League Of Villains take over I Island and seeing them getting horribly slaughtered by the Doom Slayer later on, all of Class 1A’s students are completely traumatized (even Bakugo and Todoroki) begin to develop PTSD.
  • Just One Man: Everyone's reactions to the Doom Slayer’s one-sided massacre of the Steel Sabers.
    Narration: Nine never felt this angry before in his whole life. How could this have happened?! He trained his soldiers to combat Heroes, study their Quirks, exploit their weaknesses and show them that they weren't invulnerable. How was this man capable of decimating them this damn quickly! It was maddening!
  • Know When to Fold 'Em: After the Doom Slayer beats nearly all the Pro Heroes and leaves only Rock Lock and Aizawa standing, Rock Lock realizes that fighting the Slayer is utterly hopeless and tries to get Aizawa to run away. But the Slayer knocks out Rock Lock before he can run.
  • The Law of Diminishing Defensive Effort: Both Doom Slayer and Miruko tend to ignore attacks. The Slayer can afford to since his armor is practically indestructible, but Miruko ignores her injuries out of pride and bravado. Hawks, Recovery Girl, and others constantly scold her and tell her to dodge already.
  • Madness Mantra:
    • A very pissed Shigaraki falls into an "I hate you!" rant at a stilled footage of the Doom Slayer's face.
    • Ragdoll etches one into a hospital supply closet wall saying “The Only One They Fear Is Him.”
  • Mass "Oh, Crap!": Doomslayer's utter eradication of the Steel Saber is this for Japan's Hero community and Villains who know what went down (namely La Brava, who had a front-row seat after she hacked into I-Island's camera system). For the Heroes, their fear is more based on Slayer being Just One Man who quite literally painted I-Island with mercenary blood on live TV and had the strength to combat the Heroes sent to apprehend him and fight All Might to a standstill.
  • Meaningful Name: Chapter 16 is titled "End of the Sabers". Guess what happens to the rest of them?
  • Modern Stasis: Despite the MHA world being in the 22nd century, technology has more or less stagnated in early to mid-21st century levels thanks to the appearance of Quirks. This plays further into Slayer's story as there is no way for him to return to his home universe or seemingly any technology to break his Praetor Suit's armor.
  • The Mole: Slidin' Go is a secret member of the Meta Liberation Army. He was tasked by the MLA to observe the Doom Slayer's actions on I-Island.
  • Mook Horror Show: The Steel Sabers going up against the Slayer. Nothing the mercenaries throw at him can even scratch the Praetor Suit, combined with being torn into quite literal ribbons by the vengeful Slayer.
  • Moral Myopia: The villains think nothing of committing crimes and inflicting horrific atrocities against innocent people, yet they have the gall to be outraged/gobsmacked/terrified when the Slayer starts decimating them with extreme prejudice.
  • Mugging the Monster: A gang tries to mug the Doom Slayer whom they see is a "wannabe hero". Moments later, an armless gangster is running for his life before the Doom Slayer smashed his face into a fire hydrant.
  • Mythology Gag: The Slayer's name and backstory come from the novelization of the first game, where his name was Flynn Taggert and he was reassigned to Mars as punishment for assaulting a superior officer in response to that officer ordering him to shoot civilians. He openly mentions that the last non-zombified or corrupted human he fought was that officer shortly after seeing a robbery.
  • Named by the Adaptation:
  • Never Hurt an Innocent: The Slayer is a One-Man Army Berserker who doesn't hesitate to kill, butcher, and maim demons, villains, and anyone who endangers innocent lives, but when facing off against pro heroes who either try to stop him from reaching I-Island or departing after he eradicates nearly every last villain involved, he holds back and only knocks them out because he knows most of them are good people just doing their job.
  • No-Holds-Barred Beatdown: Shigaraki’s "fight" with the Slayer is as one-sided as can be, as one is a human tank in a literal ton of powered armor who has no patience for fair fighting, while the other is a skinny man in poor physical shape in normal clothes. And while Shigaraki can disintegrate anything he touches, that advantage is rendered null and void once the Slayer relieves him of his arm.
  • No Honor Among Thieves: The League of Villains have a nasty tendency to abandon their comrades to their doom when things go wrong. To the point that the trope is silently acknowledged by Izuku, Ochako, and Shoto after they overhear Wolfman choosing to leave his men behind to die.
  • No-Sell:
    • When reviewing the footage of his "fight" with Shigaraki, the pro heroes think his ability to pull weapons out of nowhere is a storage Quirk, rather than just advanced technology. So imagine Eraser Head's surprise when his Quirk does nothing to stop the Slayer from accessing his weapons in his fight with the heroes at the docks. His eyes can only cancel other Quirks, not technology or natural strength.
    • The Praetor Suit is unable to be damaged by literally anything the heroes or villains can throw at it. Endeavor's Hellflames are useless against it, while Hawks' feather swords snap like twigs when they make contact.
    • Eraser Head manages to snag the Slayer's limbs, neck, and torso with his Binding Cloth to try and subdue him...only for the bindings around the target's limbs to rip like toilet paper, while the hero is dragged like a ragdoll from the cloth still wrapped around the latter's neck and torso. This comes as no surprise as the Slayer is ridiculously bigger, stronger, and heavier than Aizawa.
    • The Pro-Heroes are scared of The Slayer's apparent ability to do this to Eraser Head's Quirk eraser abilities. In truth, he no-sells it by... not having a Quirk to erase.
  • Ocular Gushers: When Inko comes to visit Izuku, the two burst into tears, tears that begin to pool underneath the hospital doors. Nezu and Aizawa can't help but wonder if it’s a quirk.
  • Oh, Crap!: The only reaction people have when fighting the Slayer.
    • Shigaraki when he gets his arm ripped off, then beaten with it. Dabi has the same response when Slayer pulls out a rocket launcher on him and Shigaraki.
    • Slidin' Go grabs the Slayer in a headlock to stop him from reaching the docks, only to freak out and duck for cover when he sees the Slayer already holding a grenade with no pin. The rest of the heroes who witnessed this are left speechless.
    • Eraser Head is later left shocked and horrified when his Quirk doesn't work on the Slayer.
    • The entirety of the Steel Sabers have this reaction when the Slayer starts killing them, with none of their weapons able to even scratch his armor.
    • Melissa, Miruko, Izuku, Shoto, and Ochako have this reaction when the Slayer makes his Dynamic Entry onto the rooftop.
    • Bakugo is frozen in fright when he runs into the Slayer right after he butchered the Steel Sabers guarding the hostages in the ballroom.
    • Volcano is shocked that his magma doesn't melt the Slayer.
  • The Omniscient Council of Vagueness: The Ascendant Realm and Prime Council are this, so far the only two known members are Tyrael and Auriel. The amount of knowledge they have on the Slayer is rather telling as they both are aware of the Helix Stone and his role as the destroyer of evil.
  • One-Man Army: The Doom Slayer, with some technological assistance from VEGA, handily takes on the entire Steel Saber forces.
  • The Only One Allowed to Defeat You: Dabi expressed silent contempt at the Doom Slayer for effortlessly beating up Endeavor.
    • Muscular is unhappy about the Doom Slayer for killing Wolfram and his men rather than him.
  • Outside-Context Problem: The Slayer is this for everyone in MHA. He crashed outside Izuku's apartment seemingly out of nowhere, then ripped off Shigaraki's right arm and accidentally destroyed half a mall just a day later, and then again after that day, managed to not only fight several Pro Heroes off but also started a war against the most dangerous mercenary company in the world and completely slaughtered them.
    • He's also one for the Ascendant Realm. Before his arrival, they all thought he was just a myth, but his presence makes the deities of the Realm wary of him. It's later revealed the Dark Lord has already been defeated by the Creator a long time ago and the Slayer himself is "unbound by fate", meaning they don't know why he's here nor what he will do, making him a massive enigma to the Realm.
  • Pay Evil unto Evil: The Slayer ensures that the Villains pay for all the crimes they have committed in blood.
  • Pet the Dog: Despite being hindrances, the Heroes of My Hero Academia have earned the Doom Slayer's respect as he realizes they're good people and just doing their jobs by trying to stop him. However, they may have gained his respect but not his mercy; he won't kill them, but he's not afraid to rough them up if they try to get in his way.
  • Pragmatic Hero: Sayaka's decision to cover David's involvement on I-Island and have him work with the HPSC wasn't done out of compassion or mercy, but because he's more useful helping them out rather than rotting away behind bars.
  • Precision F-Strike: Vlad King is among the many Heroes who are left very traumatized and sickened by the corpses (or what remains of them) left by the Slayer. When Cow Lady insistently tries to get Vlad King moving to arrest the Slayer, Vlad King angrily throws an F-Strike at her and almost punched her until he realizes what he was about to do while everyone present is left shocked by his outburst.
    Vlad King: G-G-G-Give us a minute.
    Cow Lady: A minute?! Dang it, we don't have time for this! Y'all need to cowboy up and-
    Vlad King: I SAID GIVE US A FUCKING-!
  • Pretender Diss: Doom Slayer is not impressed by Endeavor calling his flame Quirk Hellfire because the real thing is much hotter.
  • Put Their Heads Together: The Doom Slayer does this to Loud Cloud and Mr. Brave, rendering them unconscious.
  • Redeeming Replacement: The Ascendant Realm are this to the Maykrs, being a genuinely benevolent faction that cares for the mortals in sharp contrast to the Maykrs who willingly sacrificed countless worlds for power.
  • Rewarded as a Traitor Deserves: Volcano repays Samuel Abraham for betraying David Shield by burning him alive.
  • Righteous Rabbit: The first pro-hero the Slayer comes across is Miruko, who stops a robbery taking place in front of him. She sticks especially in the Slayer's mind due to her rabbit quirk reminding him of Daisy and her can-do attitude reminding him of his deceased wife Emily.
  • Sadistic Choice:
    • The Slayer expresses genuine guilt over fighting the Pro-Heroes to escape I-Island and can't decide to feel bad for them or curse them for getting in his way. He accepts that they're good people, but he and VEGA have no choice but to go through them. It's either that or letting them capture and send him off to Tartarus, which is definitely off the table. The only saving grace he could give them was that he didn't cripple them for life.
    • Yagi finally chooses to reveal what the Slayer did on I-Island despite knowing the chaos that will come and protest from his comrades. There aren't any better options, and they owe it to the public as their defenders; all they can do is brace for the fallout.
  • Sanity Slippage: Ragdoll tries to scan the Slayer to find out where he is on I-Island, all it gives her a vision of the literal Hell he’s faced and you can likely guess what such visions would do to a person’s mind. Any signs of the quirky and energetic Ragdoll are effectively gone and in her place is a completely broken woman so consumed by fear of the Doomslayer and what he’s faced that she nearly stabs out Miruko’s eyes with a scalpel in a fit of madness.
  • Save the Villain: Izuku and Tenya stop the Doom Slayer from executing Shigaraki and try to reason him into turning Shigaraki to the police rather than killing him. This sadly falls on deaf ears as the Slayer was still going to kill him, had Dabi not shown up and taken Ochako hostage.
  • Screw This, I'm Outta Here: Curator and the LOV operatives accompanying him decide to leave I-Island after the Slayer's presence completely derails their plans.
  • Shout-Out:
    • Volcano utters Senator Armstrong's iconic "Nanomachines, son!" quote in chapter 17 after he recovers from Izuku's knockout punch.
    • How the Slayer beats Mt. Lady is similar to Hulk beating Hank Pym in Ultimate Avengers.
  • Spanner in the Works: The Steel Sabers' initial plan was to occupy I-Island, steal all the technology, and ransom off the hostages. The plan disintegrates as soon as the Doom Slayer makes them the victims of a gruesome Mook Horror Show after they try to establish a base in the abandoned subway tunnel the Slayer was hiding in.
  • Spared by the Adaptation: Oboro Shirakuma is still alive and an active hero instead of being revived by All For One as the Nomu Kurogiri.
  • Story Arc: The story is divided into the following arcs:
    • Chapter 1-6: "Slayer"
    • Chapter 7-21: "Steel Sabers"
    • Chapter 22-31: "Premonitions"
  • Superhero Packing Heat: Or vigilante according to the pro heroes in the Slayer's case. He's blessed with superhuman strength and speed and has a preference for really. BIG. GUNS.
  • Tear Off Your Face:
    • The Doom Slayer rips a Saber soldier's face off before smashing his head.
    • The Slayer grabs Slice's hair and tears it off along with her scalp and eyelids. Slice is spared from her agony when the Slayer smashes her entire head.
  • Tears of Fear: Momo and Jiro suffer from this after witnessing the Slayer's massacre of the Sabers.
  • Technologically Advanced Foe: The Doom Slayer's arsenal and Praetor Suit are among the most advanced pieces of technology in the MHA world, with Pro-Heroes shocked at some of the weapons he's got access to and not even a barrage of bullets or Endeavor's strongest attacks can break through his armor. The only person so far that's capable of making a dent in his armor (as in literally) is All Might.
  • Terror Hero: The Doom Slayer quickly establishes himself as one of the most brutal Vigilantes in Japan due to his propensity for violence stemming from his centuries-long battle against the demons of Hell. Ochako is mentally scarred for life after witnessing him tearing off Shigaraki's right arm with his bare hands, All Might is stunned by the Slayer's sheer brutality after having seen nothing like it in his long career, and the Slayer more or less traumatizes the rest of Class 1-A after tearing apart the Steel Sabres on I-Island.
  • There Is No Kill Like Overkill: While any of his weapons could have worked just fine in taking out both Dabi and Shigaraki, the Slayer decides to pull out a rocket launcher. Thanks to the villains getting rescued via a portal, the rockets cause mass destruction inside the mall, though thankfully no one was hurt.
  • Thou Shalt Not Kill: The Pro Heroes takes serious issues with the Doom Slayer's "excessive" methods and cannot allow him to roam free for this.
    • Toshinori Yagi/All Might had considered killing All For One in the past but refused. But after his powers are severely diminished from his battle against the Doom Slayer, Yagi realized that All For One was too dangerous to be left alive and swore to kill him when he face him again.
  • Token Good Teammate: Twice is one of the few morally scrupulous members of the League of Villains, best exemplified when he's shown to be deeply uncomfortable hanging out with some of the more bloodthirsty and sadistic members of the League.
  • Troll: The Slayer can't help but indulge in this when he's faced with opponents that are too big for their britches. Most notably, his "fight" with Endeavor in Chapter 20 consists of the Slayer just letting the Pro Hero ineffectively pelt him with his most powerful attacks before casually wiping nonexistent soot off his armor just to mess with him. Then, he not only lets Endeavor pummel him, he walks backwards to make Endeavor think he's doing damage. After the Slayer has his fun, he humbles Endeavor.
  • Unscrupulous Hero: Subverted. The violence Slayer unleashes against Villains is nearly unheard of, with only Chizome Akaguro, whether as Stendhal or Stain, ever coming anywhere close to Slayer's level of brutality. However, unlike Stain or any other Villain for that matter, Slayer still has morals and is heroic in his own incredibly bloody way, never once leaving innocents to die or turning his violence unto other Heroes who're trying to stop him, despite being otherwise confounded by the Heroes' own moral code more than anything.
  • Unusually Uninteresting Sight: At first, the populace of Kamino is unconcerned about a tall guy in power armor walking among them, believing him to be another Pro-Hero. That quickly changes after he nearly blows up the mall "fighting" Shigaraki.
  • Use Your Head: Wolfram meets his end after the Slayer reduces his head into Ludicrous Gibs with a series of brutal headbutts.
  • Villain Killer: Slayer officially becomes one after slaughtering Nine and his underlings on I-Island.
  • Vigilante Man: The Slayer is treated like one by the Heroes and Villains alike after his encounter with Shigaraki.
  • Villainous Breakdown:
    • Shigaraki really loses it during and after barely surviving his encounter with the Slayer, cruelly disintegrating the same doctor who saved his life.
    • In Chapter 15, after the Slayer kills his underlings and leaves him badly bleeding and injured, Nine rants about all his achievements and yells that he won't lose to an unknown vigilante. The Doom Slayer isn't impressed by the little tirade and internally calls him a friggin' baby.
  • Villain Takes an Interest:
    • It doesn't take long for the Slayer to draw All For One's attention, to the point he even thinks about persuading him to join the League. Or at least, steal the man's "Quirk", unaware that he doesn't have one.
    • Curator is left mesmerized by the Slayer's brutality and merciless slaughter of the Steel Sabers and Chainsaw, seeing it like a "ballet of carnage" and "gory poetry in motion".
    • An anti-heroic example shows up when Lady Nagant also takes an interest in the Doom Marine after seeing his carnage on I-Island on live TV.
    • Another heroic example, The Four Horsemen of the Apocalypse became interested in making the Slayer a new Horseman after witnessing the massacre, however, War believes he will respectfully decline the offer.
    • Played a bit straighter with the mysterious doctor that Miruko runs into while departing Mustafu General Hospital, who is implied to be none other than Loki.
  • Violence Is Disturbing: The Slayer inflicting so much bloody carnage is treated this way, with Class 1-A absolutely horrified by the Slayer's actions, to the point Uraraka develops Post-Traumatic Stress Disorder from witnessing how he deals with Shigaraki.
  • What a Drag: Eraserhead is dragged along the pavement by the Doom Slayer when he attempts to capture him with his capture tape, forcing him to let go to avoid getting burns from the extreme friction involved.
  • What the Hell Are You?: The last surviving Steel Sabers mercenary spent his last moments screaming this at the Doom Slayer while desperately and futilely shooting him before being obliterated via Super Shotgun.
  • What the Hell, Hero?:
  • Worthy Opponent: Taggart ends up seeing Toshinori Yagi/All Might as one, given his willingness to force himself beyond his time limit for using One For All and denting his armor.
  • Wrong Context Magic: Everyone mistakenly believes that the Doom Slayer is a Quirk user due to his inhuman strength and capabilities. It was not until after Eraser Head failed to subdue him that the Pro Heroes eventually realized that the Slayer doesn't have a Quirk.
  • You Have Failed Me: Curator and the Volcano Thieves failed in their task of stealing the Quirk Amplification Headset thanks to the Doom Slayer, and they rightfully feared that AFO would kill them for their failures. But to their surprise, AFO doesn't see the point in punishing them as he lays the blame on Wolfram and that no one have foreseen the Slayer would get involved. Furthermore, it turns out that AFO got what he wanted when Volcano remembered that he managed to smuggle blueprints for the QAH.
  • You Have Outlived Your Usefulness: Sam Abraham is immolated by Volcano after he helps him get the Quirk Amplifier Headset.
  • You Remind Me of X: For the Slayer, Miruko reminds him of his deceased wife Emily, and his pet rabbit Daisy.

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