History Fanfic / MyHeroAcademiaUnchainedPredator

* GrewBeyondTheirProgramming: 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. [[spoiler: Little does Slayer know that VEGA isn't merely an sophisticated A.I, but in actuality he is The Father, AKA the creator of Taggart's universe and the original leader of the Makyr's, given computerized form.]]

[[quoteright:838:https://static.tvtropes.org/pmwiki/pub/images/img_7366_9.jpeg]]
[[caption-width-right:838: ''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]] Art by lukehonor [[/note]]]]

* BigBadWannabe: The author actually puts All for One here. In canon, he was the BigBad and GreaterScopeVillain 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.

* FaceHeelTurn: An inverted version. Nomura, formerly known as Semtex Hero C4, betrayed Hero Society and became a hero-turned-villain now working for All For One.

* GrewBeyondTheirProgramming: The Slayer takes time to note 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. [[spoiler: little does The Slayer know, that VEGA isn't merely an sophisticated A.I, but in actuality he is The Father, AKA the creator of Taggart's universe and the original leader of the Makyr's, given computerized form.]]

** Lady Nagant became a Vigilante and never went to prison.

** Mirko in this universe is implied to have a darker past than in canon, [[spoiler: as unlike in canon when she was simply a 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 persona is implied to be much more violent as she used brutality and a shotgun against villains and criminals 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.]]

* ArmorOfInvincibility: Thanks to the Slayer's armor being forged by a rogue Demon and then enhanced by the UAC, bullets shatter like glass against him and explosives barely make him stagger. It even stands up to Endeavor's flames. [[spoiler:That being said, All Might has proven capable of denting it albeit with his strongest attack]].

%%* BigBadWannabe: The author puts All for One here. In canon, he was the BigBad and GreaterScopeVillain 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 but an afterthought.

* DarkerAndEdgier: 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 earth...
* DarkAndTroubledPast: Mirko 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 ''[[InLoveWithYourCarnage bloodlust]].''

* DeconstructionCrossover: 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 see him as a very dangerous serial killer who must be stopped.

* FaceHeelTurn: Rokuro Nomura, formerly known as Semtex Hero C4, is a hero-turned-villain now working for All For One.

* GrewBeyondTheirProgramming: The Slayer takes time to note that since arriving in the MHA Universe, VEGA has begun to show more signs of initiative and drive.

** Both Shigaraki and Endeavor don't take their defeats at the Doom Slayer's hands gracefully.

* InnocenceLost: 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, the Class 1A students are completely traumatized (even [[AntiHero Bakugo]] and [[ConditionedToAcceptHorror Todoroki]]) and begin to develop PTSD.

[[caption-width-right:838: ''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...'']]

[[caption-width-right:838: 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.]]

[[caption-width-right:838: AND HE SHALL BE JOINED BY ANOTHER.
ONE WHOSE RAGE, STRENGTH, AND FEROCITY ARE EQUAL TO HIS OWN.
TOGETHER, THEY WILL RAIN DESTRUCTION, DEATH, AND DEVASTATION UPON ALL THEY DEEM EVIL.]]

[[caption-width-right:838: cover art]]

[[caption-width-right:838:]]

[[caption-width-right:838:some caption text]]

''[[https://www.fanfiction.net/s/13548812/1/My-Hero-Academia-Unchained-Predator My Hero Academia: Unchained Predator]]'' is a ''{{Manga/My Hero Academia}}''/''VideoGame/Doom2016''/''VideoGame/{{Darksiders}}'' crossover fanfic written by [[https://www.fanfiction.net/u/8068292/reeleffendeel reeleffendeel]].

* AcquiredPoisonImmunity: Doom Slayer is unaffected by Midnight's sleeping gas since he is adapted to breathing Hell's noxious atmosphere.

** The Doom Slayer himself gets an ample helping of this. While incredibly badass in the canon, here he destroys a black hole with his bare hands and takes on multiple top-level Heroes with nary a scratch; [[spoiler:only All Might actually damages his armor.]]

* AdaptationalHeroism: [[spoiler:The Hero Public Safety Commission]] receives this. In canon, they were [[spoiler:totally corrupt and used Lady Nagant as an assassin to kill everyone who was suspected of villainy.]] In here? While the author stated that they are not 100% clean, they haven't committed any of the horrific things they did in canon and want to genuinely help everyone.

* AntiHero: The Doom Slayer takes up this role easily. He may brutalize villains but doesn't attack innocents. And the few run-ins with pro heroes were provoked by them and even then, he only aimed to incapacitate them. His StartOfDarkness appears to have been getting reassigned to Mars in his early days after assaulting a superior officer for trying to open fire on civilians.

* BerserkButton: The Slayer is not pleased when the League of Villains tries to harm Miruko [[spoiler: due to her reminding him of 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.

* BlueAndOrangeMorality: 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.

* DarkerAndEdgier: 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.

* DesperatelyLookingForAPurposeInLife: 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.

** 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.

* YouHaveOutlivedYourUsefulness: [[spoiler:Sam Abraham is immolated by Volcano after he helps him get the Quirk Amplifier Headset.]] Doubles as KickTheSonOfABitch since he betrayed David for fame and fortune.

** [[BenevolentAI VEGA]] receives this too. In canon, he was mainly a MissionControl NonActionGuy 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 [[BackToBackBadasses side-by-side]] with Doomguy against the remaining Sabers while controlling a large mech.

* BackToBackBadasses: Vega hacks into a mech and starts helping the Slayer by attacking the Sabers with it.

* BenevolentAI: 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...

** Pretty much all of All for One's minions are shredded by the Slayer when they begin their campaign of terror.

** [[BenevolentAI VEGA]] receives this too. In canon he was mainly a MissionControl NonActionGuy 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 [[BackToBackBadasses side-by-side]] with Doomguy against the remaining Sabers while controlling a large mech.

** 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.

** Lady Nagant appears at the end of chapter 12, when she wouldn't appear until the Villain Hunt Arc.
* AdaptationalHeroism: [[spoiler:The Hero Public Safety Commission]] receives this. In canon, they were [[spoiler: totally corrupt and used Lady Nagant as an assassin to kill everyone who were suspected of villainy.]] In here? While the author stated that they are not 100% clean, they haven't committed any of the horrific things they did in canon and want to genuinely help everyone.
* AintTooProudToBeg: A Saber called Marley begged the Slayer to not kill him, promising him that he will 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.

** Nine in this universe leads the [[PrivateMilitaryContractors Steel Sabers]], a deadly mercenary group that is known by 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.

* AntiHero: The Doom Slayer takes up this role easily. He may brutalize villains, but doesn't attack innocents. And the few run in with pro heroes were provoked by them and even then, he only aimed to incapacitate them. His StartOfDarkness appears to have been getting reassigned to Mars in his early days after assaulting a superior officer for trying to open fire on civilians.

** Nine, who was not in a very good mood, kills a Steel Sabers mercenary for not considering to use the stairs when the elevators are shutdown by the EMP.
** Wolfram abandons his few surviving mercs to the Doom Slayer as he attempt to make his escape from I-Island.

--->'''Wolfram''': Screw em'.

* BlueAndOrangeMorality: 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 bodycount 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.

* BreakThemByTalking: Curator gives one to David about how his fanaticism towards All Might lead 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.

* CurbStompBattle: 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 EstablishingSeriesMoment 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 then these cheap knockoffs.

** At first, the Saber leaders manage to disorient the Slayer and even destroy his [[ChainsawGood Great Communicator]]. But once they lose the element of surprise, he goes right-back to [[CurbStompBattle work]].

* DeconstructionCrossover: Doomguy's ultraviolent methods in how he handles with villains and criminals deeply horrified and traumatized everyone, both children and adults. Even though the Slayer's victims are villains and criminals, and that he never harm the innocents, the Pro Heroes and law enforcers see him as a very dangerous serial killer that must be stopped.

* GoMadFromTheRevelation: Ragdoll attempts to mind-scan the Slayer to pinpoint his location on I-Island. Needless to say, looking into the Slayer's DarkAndTroubledPast has ''not'' been conductive for 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.

* GrewBeyondTheirProgramming: The Slayer takes time to note that since arriving in the MHA Universe, VEGA has begun to shown more signs of initiative and drive.

** During his attack on the Steel Sabers, the Slayer picks up a Saber soldier by the leg and use him as a club.

* HostageSituation: Wolfram's last remaining mercenary, who is cornered by the Doom Slayer, desperately points his gun at a detained All Might and ordering 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 [[{{Jawbreaker}} gruesomely finish him off]].
* ImmuneToFate: 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. WordOfGod confirms this was inspired by [[Literature/GoblinSlayer Goblin Slayer's]] seemingly ability of "[[ScrewDestiny not letting anyone roll the dice]]".

* KnowWhenToFoldEm: After the Doom Slayer beaten nearly all the Pro Heroes and leaving 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.

* MassOhCrap: Doomslayer's utter eradication of the Steel Saber is this for the 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 JustOneMan 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 [[spoiler:fight All Might to a standstill]].

* NeverHurtAnInnocent: The Slayer is an OneManArmy {{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.

* NoHonorAmongThieves: The League of Villains have a nasty tendency of abandoning 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.

** 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.

* OutsideContextProblem: 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.

* PrecisionFStrike: 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 were left shocked by his outburst.
-->'''Vlad King''': G-G-G-Give us a minute,

* SaveTheVillain: Izuku and Tenya stop the Doom Slayer from executing Shigaraki and tries 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.

* TearOffYourFace: The Doom Slayer rips a Saber soldier's face off before smashing his head.
** The Slayer grabs [[spoiler:Slice's]] hair and tore it off along with her scalp and eyelids. [[spoiler:Slice]] is spared from her agony when the Slayer smashes her entire head.

** [[spoiler:Toshinori Yagi/All Might]] had considered killing [[spoiler:All For One]] in the past but refused. But after his powers is severely diminished from his battle against the Doom Slayer, [[spoiler:Yagi]] realized that [[spoiler:All For One]] was too dangerous to be left alive and swore to kill him when he face him again.

---> '''Izuku''': I'm going back up the roof. Miruko needs support and I don't trust that Vigilante.
---> '''Mirio''': Izuku, no! It's too dangerous to go up there!
---> '''VEGA''': I would advise against this course of action, Mr. Midoriya.
---> '''Izuku''': [[ThouShaltNotKill I have to stop him from killing that Villain! It doesn't have to end that way! Just let me remove that headset and restrain him so I can take him to the authorities!]]
---> '''VEGA''': Wolfram has become a danger to everyone on the island and now poses a significant threat. [[ViolenceIsTheOnlyOption Attempting to subdue him via non-lethal methods is impossible at this point and he therefore should be eliminated.]]
---> '''Izuku''': No! He doesn't have to die! You-I mean, ''he'' [[ViolenceIsNotAnOption can't just solve every problem with extreme violence!]]
---> '''VEGA''': [[BothSidesHaveAPoint That much is true.]] But in this case, Wolfram is beyond the point of mental recovery and-
---> '''Izuku''': [[SuddenlyShouting STOP IT! ENOUGH OF THIS! ALL THIS DEATH AND BLOODSHED, HE CAN'T KEEP]] ''[[SuddenlyShouting KILLING]]'' [[SuddenlyShouting PEOPLE LIKE THIS!]] '''''[[SuddenlyShouting HE CAN'T!]]'''''

---> '''VEGA''': [[AssholeVictim The people you were referring to were mercenaries and Villains who were planning on murdering innocent civilians.]] By the time the Pro Heroes came here to stop them, they would have killed all the hostages along with the Heroes and escape with I-Island's Support Items to use for their own purposes. [[ViolenceIsTheOnlyOption There was no alternate solution to resolve the solution peacefully.]] [[IDidWhatIHadToDo We did what we had to do.]]
---> '''Izuku''': B-But it's still not right!
---> '''VEGA''': Then would it be 'right' to let them escape after committing what amounts to a small-scale genocide?
---> '''Izuku''': But-
---> '''VEGA''': Would it be 'right' to let the Steel Sabers to continue hunting down Heroes?
---> '''Izuku''': That's not what I meant-
---> '''VEGA''': Would it be 'right' to let families suffer from their actions?
---> '''Izuku''': I-
---> '''VEGA''': [[ArmorPiercingQuestion Would it be 'right' to]] '''[[ArmorPiercingQuestion not]]''' [[ArmorPiercingQuestion eliminate them in order to prevent them from endangering more people?]]
---> '''Izuku''': ''[[StunnedSilence ...!]]''
---> '''VEGA''': [[GreyAndGreyMorality The world is not black and white, Izuku Midoriya. It is gray.]]

---> '''VEGA''': If I may inquire, Ms. Usagiyama, why do you refrain from avoiding potentially lethal attacks?
---> '''Miruko''': Huh?
---> '''VEGA''': You were perfectly capable of dodging any of Wolfram's strikes but you instead choose to throw yourself directly into their path, risking mortal if not fatal injuries. Why is that?
---> '''Miruko''': Why do you care? Well, if you're that curious, being a Hero doesn't come without risks. There's a real chance that you could die in the line of duty, but that doesn't bother me one bit. I don't care if I lose a limb or two as long as I get to pummel whatever Villain comes my way. You think that guy was going to end me? I live every day of my life like there's no tomorrow so when my number's up, I can clock out with no regrets.
---> '''VEGA''': That is not a healthy mindset, Ms. Usagiyama. You should make an effort to avoid purposefully injuring yourself and so that you may better combat your opponent:
---> '''Miruko''': What?! I should be taking lessons from a walking tank and his pet computer program?!
---> '''VEGA''': You should not throw your life away so recklessly. Think about what you can do more for society in the future rather than focus on the impression you leave on others if you were to fall in battle as a result of your inability to avoid fatal harm.
* WorthyOpponent: Taggart ends up seeing [[spoiler: 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.]]

* YouHaveFailedMe: Curator and the Volcano Thieves failed in their task in stealing the Quirk Amplification Headset thanks to the Doom Slayer, and they rightfully feared that AFO will 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. [[spoiler:Furthermore, it turns out that AFO got what he wanted when Volcano remembered that he managed to smuggle blueprints for the QAH.]]
* YouHaveOutlivedYourUsefulness: [[spoiler: Sam Abraham is immolated by Volcano after he helps him get the Quirk Amplifier Headset.]] Doubles as KickTheSonOfABitch since he betrayed David for fame and fortune.

** Chapter 21-???: "Premonitions"

** The Doom Slayer himself gets an ample helping of this. While incredibly badass in the canon, here he destroys a black hole with his bare hands and takes on multiple top-level Heroes with nary a scratch; only All Might actually damages his armor.

!'''Category Pages are Work in Progress!'''