Disclaimer: I do not own Hero Academia/Boku No Hero Academia, or any other property in this work that I did not make myself.

What if Deku...

Chapter nine: The big reeeeeeeeeeeeeeeeeee

The audience that had been summoned to the theater room by Talespinner69 had just finished watching the latest realm that featured an alternate version of Izuku. "Huh, we've seen my dad die a few times," Todoroki said, "Saw that handy villain guy die a few times as well, and we saw Mineta die an untold many number of times."

"Don't remind me," Mineta said in a depressed tone.

Gesturing to the big theater screen, Todoroki went on, "But I think that was the first time that we saw Monoma die."

"The little brat had it coming if you ask me," Stain grumbled, "Pulling shit like that out of petty jealousy, without any actual rhyme or reason."

"I hope you guys know that I would never do something like that for real!" Monoma replied.

Where he sat in the audience, Izuku wore a look of consideration on his face. "...A power like what All Might's greatest nemesis has, but used for good. There are a lot of potential ways that it could be done, now that I think about it."

To his surprise, Toshinori found himself agreeing with the theoretical idea of All For One's power on the side of justice. "...Such potential to do good..." Toshinori said, "...And it's being wasted on evil instead. That in itself is a great injustice."

"Oh yeah," Tale said from where he and Kotaro stood in front of the big theater screen, "You'd be very surprised with what all my kind can come up with in the business of crafting realms."

Kotaro nodded in agreement. "Indeed, but that's not here nor there for now. What is here now is how the next realm is ready to play!"

"Come on making me look badass again like the last realm did," Mirko said as the next realm started playing on the big theater screen, "All decked out in metal Viking armor and ready to take on a horde of fucking dragons!" Ryukyu could only roll her eyes dryly as Mirko looked on as the show began anew.

...

A young man sat on a large boulder in the woods as he jotted something down on a notepad. This young man wore a pair of dark grayish-blue hakama pants fastened to his hips with a belt of fluffy animal fur, knee high socks of some furry hide but the socks expose his toes and heels and also fasten sandal bottoms to the bottom of his feet. He wore nothing else, showing off his notably well toned, muscular physique.

As for his person, the young man had fair skin, green eyes, a very small amount of freckles, and fluffy green hair. "Geh heh heh," the young man, probably no older than sixteen, laughed to himself as he made a checkmark on his notepad; looking at it, one would be able to see that he was actually keeping a tally, and he had made forty-nine tallies so far. He seemed excited to have gotten that many tallies.

"I'm up to forty-nine demons that I have killed," the young man said, "One more will get me up to a kill count of fifty demons!" Rubbing his hands together, the young man added, "That will make me eligible for that sweet, sweet promotion to Hashira!"

"This version of Izuku is in the business of killing demons?" Ibara in the audience remarked, "Although killing in general isn't good, vanquishing such evil does get a pass. At least if you ask me for my opinion."

Shuddering, Mineta said, "Why do I get a bad feeling about this version of Izuku?"

"Because you're a creep," Kyoka retorted dryly, and without a hint of sympathy in her tone.

As the teen got up off from the boulder, he heard some girls talking nearby; from the sound of it, they were going to pass by him. Indeed, three girls from UA High School, Mina, Kyoka and Tsuyu, were walking and talking. "Why won't that creep leave us alone?" Mina said, "And to make things worse he made Tsuyu's adorable little brother cry!"

"What he said to Samidare's face was very rude kero," Tsuyu scowled, "And I still can't believe that Aizawa-sensei wouldn't let me turn that jerk's face into ground beef."

Kyoka scoffed bitterly. "Well that's Mineta for you; a complete and utter little demon."

"Of course it's Mineta who's pissed us girls off," Kyoka in the audience said.

Gulping nervously, Mineta said, "Umm, girls I hope that-GAAAAK!" Mineta was cut off when Tsuyu extended her tongue and proceeded to use it as a garrote to strangle Mineta from behind.

"No one messes with my little siblings, you swarmy little turd," Tsuyu said in a threatening tone, "Do I make myself clear kero?"

Chuckling to herself, Mirko said, "Hot damn, Ryukyu's girls are badass sometimes." For her own part, Ryukyu couldn't hold Tsuyu getting mad against her.

Hearing the girls speak up, the teen's attention was drawn when he heard Kyoka mention that someone she knows is a demon. "A demon, she says?" Quickly, he made his way over to the girls. "Pardon the intrusion, but I couldn't help but overhear how you girls are being troubled by a demon right now."

The girls regarded the well toned but shirtless teen with some confusion. "...Yeah, this prick named Minoru Mineta," Kyoka said, "He regularly bothers me, the girls here, and other girls at our school. Oh, and he's just recently made Tsuyu's little brother cry."

"If you girls would like, I would be more than glad to handle your demon problem for you," the teen said, "Just tell me where I can find him, and I'll have turned him into a viscous red paste before you all get back."

"Just as violent as our classmate Bakugo, but more casual in offering said violence," Mina commented, "Alright, here's what Mineta looks like, and I'll also write down the location that you can most likely find him at on the back." Mina pulled a photo out, wrote something on the back, then handed it over to the teen.

"A variant of Izuku just as violent as Bakugo but more casual about it," Aizawa in the audience said, "And Mina just gave him directions directly to Mineta, even though he's likely to literally kill Mineta when he finds him."

Shrugging, Mina said, "Well the me here doesn't know that he's going to be prone to kill Mineta. She probably just thinks this Izuku will beat the shit out of Mineta."

Sighing, Mineta asked in a depressed tone, "Midoriya's going to kill me in this realm, isn't he?"

The teen received it, looked it over, then put the photo in a pants pocket. He then walked over to the boulder he was previously sitting on, grabbed and put on a hollowed out boars head mask before picking up a pair of serrated katana that both lacked hilt guards from behind the boulder, then turned to address the girls. "I'll be done shortly!" He looked skyward as he gave a battle cry of "REEEEEEEEEEEEEEEEEEE!" before running off.

...

Mineta and Kaminari were hanging out, talking to one another in a wooded area on UA grounds. "It was the little prick's fault for getting in the way of me trying to make moves on Tsuyu, I say!" Mineta declared.

"Dude, there is no way Tsuyu would ever go out with you," Kaminari said, "It's been like that before, and it's even more firm now that you've essentially bullied her little brother! Why else do you think Tokoyami who is totally awesome with the little dude has attracted Tsuyu?"

"Fumi is good with the frog girl's little bro?" Dark Shadow in the audience asked, looking confused.

"And I'm attracted to him kero?" Tsuyu added. Giving the matter some thought, Tsuyu went on, "Actually, that might be Tokoyami's first step to getting me to like him."

Blushing a bit hard in mild embarrassment, Tokoyami said, "I'll...keep that in mind."

As the two boys talked, the boar masked teen jumped in from out of nowhere with a shout of "Kamusari!" Landing on his feet, the boar masked teen pointed his left hand katana right at a reasonably wary Mineta. "Minoru Mineta, I assume?"

"...Yes?" Mineta replied as Kaminari proceeded to take some steps back.

"My name is Izuku Midoriya!" the boar masked teen declared. Brandishing both of his serrated katanas, the now named Izuku declared to Mineta, "I am here to kill you!"

"I'm out," Kaminari declared flatly in a 'not dealing with this' kind of tone as he left Mineta to fend for himself.

"He's leaving me to die just like that?!" Mineta in the audience yelled.

Meanwhile, a number of other audience members were laughing their respective asses off, including most of the villians. "This version of Izu-kun is being so hot!" Toga cheered, "We need more of this Izu-kun!"

"And Kaminari is being smart," Kyoka said, "I actually kind of like it."

As Mineta began to back up in panic, Izuku rushed him while saying, "Beast Breathing, Third Fang: Devour!" Izuku then made two horizontal slashes, one going left and the other going right, right at Mineta. A few seconds later, Mineta who had not changed expressions just stood there. Then his head slid off from his neck and hit the ground. When Mineta had died, Izuku thrusted one of his swords into the air in a pose of victory.

"Woohoo! That's fifty demons killed now!" Izuku declared, "That promotion to Hashira shall soon be-" Stopping short, Izuku looked down to Mineta's decapitated corpse. "...Hey, why isn't this demon's corpse dissolving after I had killed it?"

(What if Deku was a Demon Slayer)

"Took the thing long enough to show us the title," Dabi in the audience said, "Although most of us probably could have figured things out before the reveal."

"Midoriya killed me because some of the girls made him think I was an actual demon!" Mineta exclaimed in complaint.

Inko, looking stunned, said, "I can't believe I just saw my baby kill someone!"

"He also killed in the one where he was a villain, you know," Mitsuki pointed out dryly.

...

Later over at UA, Nezu and Aizawa were in the former's office, meeting with Kyoka, Mina, Tsuyu, and Izuku who was holding his boar head mask under his right arm. To the girls, Aizawa said, "So let me see if I got this straight. You girls tricked a member of the Demon Slayer corps into thinking that Mineta was an actual literal demon, then gave him directions to Mineta and allowed the dominos to fall where they may?"

"I'm pissed they lied to me!" Izuku scowled, "That wasn't a demon at all!"

Shrugging, Kyoka said to the underground hero, "Well maybe if you did your job and actually had Mineta punished as he should have been for all of the harassment he's given me and the other girls, this probably never would have happened."

Holding up a flash drive, Tsuyu said, "We have multiples of these, all of them holding details on what all Mineta had done as well as detailing how you let him get away with it more or less, Aizawa-sensei. Imagine the field day the press would have if they got ahold of this kero."

"Hot damn!" Mirko in the audience exclaimed, "These girls not only called Aizawa out, but they also got him by the balls!"

Looking down at where Aizawa sat, Ryukyu said, "Does he really allow one of the boys to get away with acting like that? Behavior like what the Mineta boy does ought to be an offence worthy of both expulsion from UA and subsequentally being arrested by the police."

"There is honestly no excuse or justifiable reason to let the pervert boy act on like that, at least if you ask me," Stain remarked, "So tell me, Eraserhead. Why do you never properly punish the lewd boy, hmm?" Aizawa, feeling more than a few eyes on him, wasn't sure what to say.

Sighing in a resigned tone, Aizawa said, "Alright, alright, I get it. Next time a male student acts towards girls the way Mineta did, I'll suggest expelling the guy."

"That still doesn't excuse how the girls here tricked a Demon Slayer into killing Mineta," Nezu pointed out, "Nor does it excuse a number of other points I want to address. But those will come later." To Izuku, Nezu said, "I'm terribly sorry how some of my school's students tricked you, Mr. Demon Slayer."

Shrugging, Izuku said, "Just explain things to the higher ups of the Demon Slayer corps to help get some of the eventual heat off of me. That'll make up for-" Izuku was cut off when an explosion sounded off from somewhere in the school. "The hell was that?!" Izuku exclaimed.

"That doesn't sound like one of Bakugo's," Aizawa said in a worried tone as everyone ran out of the office.

"Oh ho ho, things are heating up, it would seem," Spinner in the audience said in an amused tone.

Folding his arms over his chest, Dabi remarked, "I would like to see an actual demon get killed in this realm."

...

In the cafeteria, a large hulking monstrosity with grayish skin, long white hair and six eyes was rampaging, with UA students either fleeing in terror or trying to fight it. "It's just one of those Nomu things the League of Villains uses!" Monoma of class 1-B declared, "We can take it if we work together on this!"

Monoma, with Shihai and Togaru following him, ran to confront the monster. But the monster reached forward with both of its large hands, grabbed them around Monoma, then lerched its head forward while its mouth was opened impossibly wide. It shoved Monoma's head into its mouth then bit down hard on his neck, biting Monoma's head off and killing him.

"Holy shit!" Sekijiro in the audience exclaimed, "That thing just ate Monoma's head!"

"I died two realms in a row?!" Monoma exclaimed indignantly, "What, will I end up as this show's equivalent of Mineta?!"

"I sure as hell hope not," Tale replied from where he and Kotaro stood in front of the big theater screen.

As the monster dropped Monoma's headless corpse as it crunched up and ate his head, both Togaru and Shihai turned around and ran for dear life, with Togaru crying out of a mix of fear and having just seen one of his classmates die right in front of him. As for Shihai, what he did was piss and shit himself simultaneously out of sheer fright as he ran.

As everyone panicked, the party from Nezu's office arrived on scene. "Aha! An actual demon!" Izuku said, "Now I can get my demon kill count up to fifty!"

"That thing killed Monoma!" Aizawa exclaimed, "Ate his head from the looks of it!"

Taking his serrated katana out, Izuku said in an indifferent tone, "Huh, must be a picky eater. Most demons won't care what part of the human that they eat." Izuku then rushed forward to attack the demon head on.

"I'm shown not caring about Monoma dying?" Izuku in the audience said, "What is wrong with me here?"

Shrugging, Tale replied, "Demon Slayers, from what I have gathered, have seen a LOT of stuff, man. This version of you is probably desensitized."

"Beast Breathing, Second Fang," Izuku said as he made a double x-shaped slash with his swords against the demon, "Rip and Tear!" A horrific wound was made into the demon's back, causing it to howl in pain as it turned to face whoever it was that had wounded it. From where the rest of Nezu's group stood, they saw the demon's wound start to heal fairly quickly.

"It's got the Super Regeneration quirk?!" Aizawa exclaimed, "Oh shit!"

"No, all demons are quirkless," Izuku answered casually, "Super regeneration like that is something all demons have by default." Izuku then swung his swords around in all sorts of random directions. "Fifth Fang: Crazy Cutting!" Many cuts and tears were rendered into demon flesh, making the demon stumble back a bit.

"Wow, Deku is totally killing it here!" Bakugo in the audience said, his tone making it clear that he was actually rather impressed.

Ibara nodded in agreement. "Indeed. He's punishing that evil spawn of evil quite well."

Juzo looked over to his Christian classmate, saw that the sight of a demon being killed was actually entertaining her. "...Huh, neat."

"Fourth Fang: Slice n' Dice!" Izuku yelled, making multiple diagonal slashes with his swords. This attack actually cut off half of the demon's right hand, although it quickly regenerated. The demon roared as it tried to make a grab for Izuku, although he jumped out of the way quickly to avoid getting grabbed.

Izuku then used Crazy Cutting again, this time cutting off the demon's right hand entirely as well as its left arm at the elbow. As the demon regenerated, Izuku went for its neck as he shouted, "Sixth Fang: Palisade Bite!" Izuku swung his swords at the demon's neck, severing the head off cleanly. The headless demon fell to its knees dead as its body disintegrated into ash, head and all.

"Holy shit! Deku killed a fucking demon!" Bakugo in the audience exclaimed, "That's fucking badass as fucking fuck!"

"Katsuki!" Mitsuki snapped, "Who the fuck taught you to fucking talk like that you fucking brat?!"

Rolling her eyes dryly, Inko said, "Uhh, Mitsuki..."

After the demon that Izuku killed disappeared, Izuku pumped his swords into the air. "Woot! That's fifty demons killed! Hashira promotion, here I come!"

Aizawa, Nezu and the girls all looked on in disbelief. "He...he actually killed that thing..." Aizawa said in a tone of shocked, dumbfounded surprise. The underground hero gently shook his head. "...Wow. Demon Slayers are a different kind of crazy from pro heroes, that's for sure."

"Umm, excuse me," a voice called out, making Aizawa and the others turn to face who had called out. It was Todoroki and Tenya, although both were dressed in the standard Demon Slayer corps outfit, Todoroki wore a green haori and had a wooden box bag over his back, and Tenya who looked nervous wore a yellow haori. It was Todoroki who called out.

"Are Todoroki and I both Demon Slayers as well?" Tenya in the audience asked.

"And what's with the box on my back?" Todoroki asked.

Arching a wry eyebrow, Nezu said, "And you boys are?"

Gesturing to himself then Tenya in that order, Todoroki explained, "I'm Shoto Todoroki and this is Tenya Iida. We're both members of the Demon Slayer corps. We're looking for our fellow Demon Slayer, a guy named Izuku Midoriya."

"You mean him?" Mina asked as she pointed to Izuku, who stood there as if gleaming. "Yeah, he just killed a demon that ate Monoma's head."

Sighing in a mildly exasperated tone, Tenya said, "Don't tell me he's gotten up to the fifty demon killed mark."

"Indeed I have!" Izuku exclaimed, "Bask in my glory, my underlings! For you are now baring witnesses to the birth of a new Hashira! Bhuhahahahaha!"

Smirking, Bakugo in the audience said, "I'm liking this version of Deku more and more! Why can't the real Deku be a demon slaying samurai badass like this one?"

"Because swords aren't allowed on UA grounds?" Izuku answered rhetorically.

Todoroki sighed in mild amusement at Izuku's excitement. Todoroki took the box off of his back and set it down. It then opened, and a short, slender kid crawled out. He had scruffy black hair, wore a man's kimono top and matching hakama pants, a sleeveless haori coat over that, tabi sock, zori sandals, and a bamboo gag in his mouth, secured around the base of his head with a red length of silk.

Pointing to the guy who popped out of Todoroki's box, Kyoka asked, "Who's that?"

"Oh, that's my older brother Toya," Todoroki explained, "He got turned into a demon but was able to retain his humanity, so now I'm looking for a way to turn him back."

"Dudes! It's Dabi!" Spinner in the audience exclaimed as he pointed at the big theater screen.

"I'm actually the oldest sibling, but this version of me looks like he's eight years old tops," Dabi commented.

Spotting Izuku, Toya walked over and threw his arms around Izuku waist in a hug. The boar masked Izuku looked down at Toya after the demon older brother of Todoroki let go of him. Izuku then reached into his pockets, pulled out a small handful of acorns, and handed them over to Toya, who seemed happy enough to receive them.

FIN

"He gave me acorns?" Dabi said in a confused tone.

"Why is this version of me just randomly carrying acorns in his pockets?" Izuku asked, sounding similarly as confused as Dabi.

Shrugging his shoulders, Tale remarked, "Well that could have gone way worse, considering how violent the Demon Slayer job can be."

Chuckling, Kotaro said, "Yeah. I expected there to be loads more death than there actually was." A lot of people in the audience looked a bit freaked out by that, worried about how dangerous and potentially fatal the realm that Demon Slayers come from can be.

END OF CHAPTER

Author's notes;

Well that's the chapter where Izuku is a Demon Slayer. I got another working idea for a chapter for this story, so I'll get to work on it soon. I hope that you all enjoyed this one.

Oh, and by the way, Monoma will NOT be killed off frequently here; Mineta already has that deal, I don't think it should be given to Monoma either. ...Unless there's enough people want it for some odd reason.