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 four: Kaio what?

The audience that had been summoned by the Realmcrafter Talespinner69 had just finished watching the latest realm to feature an alternate version of Izuku. There had been three realms so far, and although one did indeed unsettle the audience, the others were rather nice when one got down to it. So far, the audience was discussing what they had seen in the realms so far, in regards to the different versions of Izuku.

"I liked the last Izuku that we saw so far the best," Mina remarked, "He had a dashing rogue vibe going that really suited him well."

"I think the first one was rather sweet," Uraraka admitted, "Although I didn't like what the Mineta in that realm did to that realm's Izuku."

"It was an accident!" Mineta exclaimed.

Gently shaking his head, Tale said, "Yeah, that probably won't matter, even for real in your world."

"What I want to know," Mirko began as she folded her arms over her chest, "Is who that fat nerdy girl that was in the photo with me in the last realm was."

Kotaro offered a similarly as confused shrug. "Maybe it'll remain as one of those mysteries that will never be solved."

Pounding a fist into his hand, Bakugo snarled, "Why can't we get a kickass realm with lots of badass action?"

"Hey, the realms are set to be brought up randomly," Tale said, "Similar to how it's set in the show with alternate versions of the first year hero course girls."

"Although given the variety of realms with alternate versions of Izuku, you never know," Kotaro remarked, "But that's not here or there. What is here of there is the fact that the next realm is ready to be played."

Everyone turned front and center to face the big theater screen, a lot of them eagerly anticipating what next version of Izuku will be seen next. "Come on badass Deku," Bakugo said, "Give us a badass Deku!"

"I'm still wanting an Izuku who has cash to burn who goes out of his way to treat Uraraka like a princess," Mina remarked.

"...You won't stop, will you Mina?" Uraraka asked in an embarrassed tone as the fourth realm with an alternate version of Izuku began to play.

...

All Might in his buff form was facing down against All For One, the king of evil. The two were locked in a ferocious battle that would determine the fate of Japan. "Your tyranny ends here and now, All For One!" All Might boldly declared.

All For One allowed himself a chuckle. "You are a fool to oppose me, All Might. You like every other before you shall perish at my hand."

"So this one starts with All For One and myself locked in a ferocious battle," Toshinori in the audience remarked.

"Whoever crafted this realm got a few things right," All For One said, "Like how all others before All Might had perished." A few members of the audience couldn't help it when shivers went up their respective spines.

The two mighty titans were about to clash once more, but they were cut off when someone landed nearby with a force greater than what All Might even in his prime could pull off. When the dust cleared, it was seen that the person who landed was a teen boy with green eyes, a messy mop of green hair, some freckles on his face, and he wore casual clothes consisting of a baggy t-shirt that said 't-shirt', a pair of baggy pants held up with a belt and some shoes.

"There's Izuku!" Uraraka in the audience cheered, "He's come to help All Might!"

"Yeah, but why doesn't he have his quirk active?" Yaoyorozu asked in a concerned tone.

The mysterious teen boy pointed a finger at All For One. "You, Potato-headed man. You must be this Alfalfa person I've been hearing about." The mysterious teen boy sounded arrogant, prideful and looking for a fight.

All For One, if the upper half of his face wasn't scarred over, would have darted his eyes from side to side in confusion before looking to the boy again. "...I am All For One, yes."

"Excellent." The mysterious boy clenched a fist in front of himself. "I shall now proceed to repeatedly pummel you in the face."

"I'm...I'm sorry, that's a new one," All For One said, caught off guard by how casual the mystery teen was being in threatening him, "Wait, just who are you?"

"Did that little shit really just not only threaten Sensei but insult him as well?!" Shigaraki in the audience exclaimed, "And to his face no less?!"

"And the way that Deku was challenging All Might's nemesis," Bakugo said, "You'd think that it was me if we couldn't see who it was that was threatening that bastard."

The mysterious teen boy chuckled a bit in self-amusement. "I suppose a human such as yourself wouldn't know about me, or the legend of my people that I have attained." Suddenly, the boy powered up considerably, his green hair turning yellow blonde and his eyes blue as he radiated energy so potent it made wind rush past both All For One and All Might.

"I am Izuku! The prince of all Sayans!" the boy exclaimed as he gave his name, "And I shall be the one to defeat you!" Before anyone could have tried stopping him, Izuku rushed All For One and proceeded to pummel him with a flurry of punches, kicks and unarmed strikes, before blasting him away with an energy attack.

"Hot damn!" Bakugo in the audience exclaimed excitedly, "I got my wish! It's a badass Deku!"

"He's...He's throwing All For One around like a rag doll," Toshinori said as he looked on in sheer disbelief, "As if it were nothing."

All For One got up and threw an attack at Izuku, but it did nothing but bounce off of the boy. "Hmph, did you really think such a pathetic display would work on someone who has achieved the legend?" Izuku asked cockily, "Perhaps I ought to teach you a lesson on the legendary might of Super Saiyan!" Izuku aimed the palm of his right hand at where All For One was now sitting helplessly. "BIG BANG ATTACK!"

All For One was instantly enveloped in a massive energy attack that ravaged his person to such a degree that his began breaking up and apart. As he screamed in pain, All For One was vaporized by Izuku's attack. The dust settled, and All For One was no more. Izuku lowered his arm, giving off a scoff of disappointment as he powered down out of Super Saiyan.

"No...No way..." All Might said as he looked on in complete and utter shock.

(What if Deku was a Saiyan)

"What the fuck was that?!" Shigaraki in the audience exclaimed, "He vaporized Sensei like it was nothing!"

"It...was a bit unsettling to see, yes," All For One admitted.

"Holy shit that was awesome!" Bakugo cheered as he and some of the other UA boys all cheered excitedly over seeing this saiyan version of Izuku utterly trounce the greatest villain that All Might had ever faced.

"I'm...a bit worried about how this Izuku has an attitude similar to Bakugo's," Uraraka said, a concerned look on her face.

Nodding in agreement, Tale said, "Yeah, he ain't got Goku's attitude, that's for sure."

"Who's Goku?" Izuku asked in a curious tone.

...

The following day, Izuku was walking through the halls of UA, wearing the uniform for boys although he didn't have the jacket on. He was walking alongside Bakugo and Nezu, the latter showing him to the class 1-A homeroom. "Remind me again why I'm going to be attending this school for powered human teens like Bakugo?" Izuku asked, sounding confused and a little bit annoyed with what was going on.

"Well given your vast potential, it is imperative that the teachers here at UA help to mold you into a part of the next generation of pro heroes," Nezu explained. The group then reached the 1-A classroom, with Bakugo opening the door.

The group was greeted by the sight of Aizawa, the homeroom teacher for 1-A. He looked a bit surprised to see Nezu standing there with the boy who vaporized All For One. "Here is your new student, Aizawa," Nezu said, "Oh, and Bakugo was simply helping me teach Izuku all about life here at UA."

"So Nezu here just thrusts a superpowered kid easily capable of blasting villains as dangerous and powerful as All For One into dust right onto my lap," Aizawa in the audience droned on dryly, "Because of course he does."

"I would be more tactful in a situation like this for real, yes," Nezu said.

"Wait, I wasn't attending UA before this?" Izuku asked.

Getting up from his desk to greet Izuku in an effort to be friendly, Mineta said as he held out a hand for a handshake, "Welcome to UA. It's nice to have you here."

Izuku arched a wry eyebrow at Mineta. Turning to look at Bakugo, Izuku asked, "And who's this scrawny puke?"

"That is my classmate Grape Head, Izuku," Bakugo replied, sounding like he was somewhat trying to suck up to the saiyan boy, as well as being mildly afraid of him, "There is no need to bother yourself with him. He is a lewd, pathetic boy."

"Beta male, got it," Izuku said in an understanding tone that was an even mix of uninterested and indifferent towards Mineta.

"Did he just insult me to my face?" Mineta in the audience complained.

"And why am I shown being both afraid of and trying to suck up to Deku?!" Bakugo snapped.

"Hey, this version of Izuku is a saiyan," Kotaro pointed out, "They can very easily blow up entire planets with their attacks. It's actually wise to show such caution around a saiyan."

"Blow up entire planets?" Izuku said in a confused and mildly worried tone.

...

Later, class 1-A was showing Izuku around their dorm building. "And this is where we live on campus," Bakugo said as he and the others led the saiyan boy inside.

Looking around, Izuku wasn't too impressed. "And where is the-"

"Class 1-A!" a male voice called out, cutting Izuku off and irritating him. Turning around, everyone saw their rival class, 1-B, come walking into their dorm building, led by a blonde haired boy leading the pack.

Sighing in a resigned tone, Itsuka in the audience said, "And now Monoma is going to piss all over Izuku's shoes here."

"Oi, I don't piss on the shoes of others!" Monoma exclaimed.

Chuckling a bit, Juzo said, "Metaphorically speaking, you do it all the time."

Pointing to class 1-B, Izuku said to the 1-A students, "Who the hell are they?"

"That's class 1-B, our rival class," Yaoyorozu explained, then added while pointing to Monoma, "And that blonde guy who called out to us just now is Monoma."

"Don't bother with him, Izuku," Bakugo said, "He's a hysteric holler monkey with a hate-boner for our class."

"Another beta male?" Izuku remarked in a mildly disgusted tone, "Oh god, they're multiplying!"

"Why am I being more insulting than Kacchan?" Izuku asked in a worried tone.

Shrugging, Tale said, "Given the vast difference of power between your world and the world that saiyans come from, it's very much understandable that a saiyan warrior would be so dismissive of humans."

Nodding in agreement, Itsuka said, "I get the feeling this version of Izuku could beat up everyone else in the whole of the first year hero course."

"And all of UA," Kotaro added, "And the whole rest of hero society. Hell, he could probably solo the entire world you come from."

Pointing defiantly at class 1-A, Monoma said, "We're here to prove once and for all that our class is the superior one!"

"Correction," Yosetsu said dryly, "It's only you who's here for that. The rest of us are here to drag your sorry ass back to our dorm after you get the crap kicked out of you by someone in class 1-A for bothering them.

"Nonsense!" Monoma declared, "Once we-" Monoma was cut off when Izuku rushed him and punched him in the gut so hard, it not only knocked Monoma out but it also made the blonde boy of class 1-B defecate in his pants.

"He made me shit myself?!" Monoma in the audience exclaimed, while most other members of the audience were laughing their asses off.

Pointing at the big theater screen, Bakugo exclaimed, "I don't care that I'm answering to this version of Deku! He's fucking awesome!"

"I wouldn't mind snagging him as an intern," Mirko commented through her chuckling, "Even though I tend to fly solo."

After catching a foul whiff, Yosetsu said with a hint of amusement in his tone, "...Having the crap punched out of him instead works just as well."

"Tell him when he wakes up that the next time he bothers me and the humans in my class," Izuku said, "The resulting punch will rupture his stomach." Class 1-B gathered the knocked out Monoma, with the boys handling him as the girls refused to go near him while his pants were still loaded. They then left the 1-A dorm building.

After class 1-B was gone, Izuku turned to face his human classmates. "...Is there anything to eat around here?" the prince of all saiyans half asked half demanded in a dry tone.

"We got a kitchen," Kaminari replied, with Izuku nodding in understanding before following Kaminari out to the kitchen to get something to eat.

FIN

"So he overpowers pretty much everyone around him," Tenya began, "Gets into UA because of his power, and gets away with both casually insulting and beating up his fellow students." With a concerned look on his face, Tenya added, "Not to mention how he got away with threatening to inflict mortal injuries on others."

"It's just like Bakugo," Todoroki remarked.

"ZIP IT, ICYHOT!" Bakugo snapped.

"I...do not like that version of me at all," Izuku said in a concerned tone.

Nodding along, Tale said, "This is one of the versions of you as a saiyan that I've seen, although most others before now that I recall had you as far more benevolent." With a curious look on his face, the Realmcrafter added, "And dim witted. This version seems far sharper by contrast."

"Hoo boy, makes me wonder what other kinds of Izukus are out there," Kotaro said.

"Yes," Tale replied.

END OF CHAPTER

Author's note;

Yeah, this is one that I was going to do eventually, but I was originally going to do it later than this. However, I still need to work out some points in other ideas, and this one was pretty much finished so I decided to put this one out. I got the next one figured out to some degree, but as always I'm open to ideas and suggestions.

Keep it real, folks.