History Fanfic / MyHeroAcademiaUnchainedPredator

* SanitySlippage: [[spoiler: Ragdoll tries to scan the Slayer to find out where he is. This gives her a vision of the literal Hell he’s faced. You can likely guess [[GoMadFromTheRevelation 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 stand out Miruko’s eyes with a scalpel in a fit of madness.]]

** 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 Slayer did the world a favor by wiping them out. Not even the League of Villains is sad to see them go.

* BeyondTheImpossible: The Slayer in chapter 21 manages to [[spoiler: catch and crush a '''BLACK HOLE''' sent from Thirteen.]] Every other hero is left terrified at this feat.
** In the same chapter, All Might manages to [[spoiler: actually ''dent'' parts of the Praetor Suit.]] This earns him more respect from Taggart for being able to harm him to begin with.

* 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 Pro-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.

* 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.

* TheDreaded: The Slayer was already this to the demons, but here he proves that this is a trope well earned via his patented blend of ultraviolence.
** His first encounter with Shigaraki and Dabi leaves the normally smug villains scared shitless, especially when he points a fully armed rocket launcher at them.
** The Steel Sabers, thousands of fully trained hero-killing mercenaries that are holding everyone on I-Island hostage, are butchered in such a grisly fashion by the Marine that they're no longer focusing on their operation. Now they're just trying (and failing) to escape with their lives.
** The students of UA and the pro heroes themselves are especially disturbed by the man's level of brutality, from watching his fight with Shigaraki to the live feed of him massacring the Steel Sabers like cattle even when they beg for their lives.
** Even All Might's blood turns cold from watching his bloodbath of a battle with the Steel Sabers, noting that he's never seen such a level of savagery in his long career as a hero.
** The Ascendant Realm and Prime Council initially thought the Slayer was a myth. When he is confirmed to be real, both are at a loss as to what to do with him.

* HeroWithBadPublicity: 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.

* {{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 noneffectually 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 backward to make Endeavor think he's doing damage''. After the Slayer has his fun, he [[CurbStompBattle humbles]] Endeavor.

** Bakugo has this when he arrives at the ballroom in which All Might and the others are held hostage at after the Slayer butchers the Steel Sabers guarding the hostages, being left utterly frozen in fright as the Slayer just passes by him.

* BadBoss: 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.

* BloodSplatteredWarrior: The Slayer is this after killing ''thousands'' of Sabers in Chapter 15.

* 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 Pro-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, who's mind snapped like a twig after trying to read his.

** Swordkil, Nobu, and Daigo are quickly and brutally killed by the Slayer.

** 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 Slayer did the world a favor by wiping them out.

* MassOhCrap: Doomslayer's utter eradication of the Steel Saber is this for the Japan's Hero community Villains who know what went down. For those who are in the know, 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 a 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 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.

** The Steel Sabers 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.
** [[spoiler:Nine and his lieutenants]] bite the dust in Chapter 16, and honestly, they had it coming for them.

** In ''{{VideoGame/Doom}}'' canon, Doomguy's name has always been different between adaptations, here his name is Corporal Flynn Taggart. This is also a MythologyGag, as that was the name of the Doom Marine in the novelization of the first Doom.

* NeverHurtAnInnocent: The Slayer is a OneManArmy {{Berserker}} who doesn't hesitate to kill, butcher and maim demons, villains and anyone who endangers innocent lives, but when faced with pro heroes who try to stop him from reaching I-Island, he holds back and only knocks them out, because he knows most of them are good people just doing their job.

* BlueAndOrangeMorality: Thanks to the Doomslayer's long crusade against Hell, he's long been desensitized to the violence he inflicts against any threat to innocents. While the Pro-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 not only being unheard of as 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 just ''why'' Slayer is so brutal is Ragdoll, who's mind snapped like a twig after trying to read his.

* BigDamnHeroes: [[spoiler: 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.]]

* BlueAndOrangeMorality: The Doomslayer's crusade against Hell has been going on for ''eons''. At this point in his life, no act of violence he inflicts against a threat to innocents is too brutal for him, having long been desensitized to such horrors. While the Pro-Heroes recognize that Slayer has enough sense to hold back against them, the slaughter he leaves in his wake is far too much for ''any'' of the cast to stomach, with Slayer's propensity for violence not only being unheard of, but the I-Island bloodbath leaving a body count higher than most heroes see in their whole careers. Ragdoll is currently the only Hero who even remotely has a clue to the Slayer's motivation, and her mind snapped like a twig after trying to read his.

* BulletCatch: A tank gunner fires a shell at the Slayer, who catches it with one hand.

* GrievousHarmWithABody: 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.

*** In Chapter 20, Endeavor (being his usual hot-headed self) throws caution to the wind and tries to surprise attack the Slayer... [[CurbStompBattle it doesn't go well for Enji.]]
*** Chapter 24 reveals that Shigaraki is still ''very'' pissed at Flynn for tearing off his arm, so much so that re-watching what he did to him on TV is enough to set him off.

** 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. The only saving grace he could give them was that he didn't cripple them for life.

* SadisticChoice: 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.
* SaveTheVillain: Izuku and Tenya stops the Doom Slayer from executing Shigaraki and tries to reason him in 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 showed up and taken Ochako hostage.

* TearsOfFear: Momo and Jiro suffer from this after witnessing the Slayer's massacre towards the Sabers.

* TokenGoodTeammate: Twice is one of the few morally scrupulous members of 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 noneffectually 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 [[CurbStompBattle humbles]] Endeavor.

** VEGA calls out Izuku's naivete when he attempts to intervene in the Slayer's battle against Wolfram on I-Island, pointing out that letting villains like the Steel Sabers live not only would be stupid, but would also spit on the families and loved ones of those who died to them.

* WrongContextMagic: Everyone mistakenly believes that the Doom Slayer is a Quirk user due to his inhumane strength and capabilities. It was not until the Pro Heroes eventually realized that the Slayer doesn't has a Quirk after Eraser Head failed to subdue him.

* YouRemindMeOfX: For the Slayer, Miruko reminds him of his deceased wife Emily and his pet rabbit Daisy.

* BlueAndOrangeMorality: The Doomslayer has been fighting a crusade against Hell for ''eons''. At this point in his life, no act of violence against a threat to innocents is too brutal for him, having long been desensitized to such horrors. While the Pro-Heroes recognize that Slayer has enough sense to hold back against them, the slaughter he leaves in his wake is far too much for ''any'' of the cast to stomach, Slayer's propensity for violence being unheard of in the Pro-Hero world, the I-Island bloodbath having a body count than most heroes never see in their whole careers. Ragdoll is currently the only Hero who even remotely has a clue to the Slayer's motivation, and her mind snapped like a twig after trying to read his.

** 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.

* 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.

** Chapter 26 shows that Ragdoll has began drawing pictures of the Slayer, his Mark, and the demons along with inscribing "the only thing they fear is him" over and over.

* ItIsDehumanizing: Mummy states that most of the Steel Sabers are dead because of the Slayer, or as he put it, that ''thing''.
-->'''Mummy''': Half of our entire organization is dead because of that ''thing!''

* MadnessMantra: A very pissed Shigaraki falls into an "I hate you!" rant at a stilled footage of the Doom Slayer's face.
** [[spoiler:Ragdoll etches one into a supply closet wall saying “The Only One They Fear Is Him.”]]

* ModernStasis: Despite the MHA world being in the 22nd century, technology has more or less stagnated in 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.

* OcularGushers: When Inko comes to visit Izuku, the two burst into tears, tears that begin to pool underneath the hospital doors. Nezu and Aizawa wonder if it’s a quirk.

* EveryoneHasStandards: Everyone is flat-out horrified by the sheer violence the Slayer dishes out upon his targets, even if they had it coming.

* EnemyRisingBehind: The Doom Slayer comes right behind three Steel Sabers mercenaries making a televised demand to the public. They remained 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.
* EveryoneHasStandards: Everyone is flat-out horrified by the sheer violence the Slayer dishes out upon his targets even if they had it coming.

* 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 finishing him off]].

* TokenGoodTeammate: Twice is one of the few morally scrupulous members of League of Villains, best exemplified when he's shown to be deeply uncomfortable hanging out with some of the more bloodthirsty and less-morally restrained members of the League.

* BreakingPointSwearing: 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 a F-Strike at her and almost punched her until he realize what he was about to do while everyone present were left shock 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''': '''[[SuddenlyShouting I SAID GIVE US A FUCKING-!]]'''

* TokenGoodTeammate: Twice is one of the few morally scrupulous members League of Villains, best exemplified when he's shown to be deeply uncomfortable hanging out with some of the more bloodthirsty and less-morally restrained members of the League.

* TheFriendNobodyLikes: 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.[[spoiler:After learning about the deaths of Wolfram and his underlings at the hands of the Slayer, the LOV members [[LastDisrespects expressed their contempt]] on their so-called comrades.]]

* TheFriendNobodyLikes: 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.[[spoiler:After learning about the death of Wolfram and his underlings at the hands of the Slayer, the LOV members [[LastDisrespects expressed their contempt]] on their so-called comrades.]]

* 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 gruesomely finishing him off.

* 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 the trigger, causing him to drop his weapon and allowing the Slayer to gruesomely finishing him off.

* GrievousHarmWithABody: Doomslayer 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.

** In Chapter 19, [[spoiler:Wolfram]] gets his just desserts when the Slayer tears him out of his golem of junk and proceeds to headbutt him into oblivion. The villain's head got crushed so hard that the story describes it as ''a dropped pie''.