Hello once more dear listeners! Tentemperor here with the third installment of NHA. Once again I'd like to express sincere thank yous to everyone who has left reviews on the first two chapters. I've been absolutely floored by the overwhelming support, and it fills me with joy to see some of you so passionate about it.

That said, I believe I should do a better job on clarifying something: This is not a Generator Rex crossover. I will be blunt. I was already growing out of watching cartoons by the time it aired back in the day. So I have watched, at most 4 episodes. And I have at present no intentions of watching it. I'll repeat myself, Nanites is another term for Nanomachines. And, as I will be stressing in the story itself in the following chapter. At this point in time, Izuku does not have any of the nanites inside of his body. Do not worry, it will all be explained as thoroughly as I can manage it in a story context. Does this mean it will never happen? Who can say. I'm leaving it out for now as a possible route of future development.

Next, I'd like to apologize for being too vague in terms of Izuku's current skill set. Tiguylerobot left a compelling argument against granting Izuku All For One, but from what I understood it was based on the assumption that Izuku was at present able to alter his body with a mere conscious effort from the nanites. That is not the case. His body is. At least right now, completely organic. The 'Basscannon' was essentially in the same boat as the 'megabuster' or the 'arm cannon' from Megaman and Metroid respectively. As in, it is not his arms and hands themselves which transform, but rather the nanites creating the machinery around them.

Aside from this, Tiguylerobot has some, interesting ships. I confess. And aside from him a good argument has been raised by Emiya-excalibur to pair him with Melissa Shield. Which I'll simply go out and be 100% honest. I have as of yet not seen the BNHA Movie. I know, I'm a busy guy alright? So I am at the very best unfamiliar with the character. And the arguments raised also seem to fit swimmingly for some local talent. Say Mei Hatsume. However this has by no means been decided yet. Though having watched the trailer. He does raise a strong argument, only that I simply do not have enough data on her to give a believable rendition of her, and at that point the character might as well be an OC. Something I will do my best to be very limiting to. As in, should they appear. It will unless something dramatic happens down the line. Be background characters with little to no relevance outside of the immediate plot.

Returning for a moment to the question of yes or no to OFA, I myself would have an easier time believing the power of Izuku to be able to perform some of the feats mentioned in the arguments against him being granted OFA, as being the result of using OFA, which is at its core a quirk stockpiling energy, to supercharge the Nanites.

Honestly, one of the easiest things to do with the Nanites, is simply making them able to devour an entire city by virtue of there being enough of them. I could write 3 lines on the matter, and it terms of this AU fanfiction cannon, it would be… well. Cannon. But that isn't interesting. That isn't fun. When coming up with Alternate powers for an established character it isn't so much the outright potential these powers give. But rather what can be done within the limitations of any given power set. Look at how Izuku has used OFA in cannon BNHA: He started out learning the hard way that using 100% while ridiculously powerful. Was unsustainable. So instead he is now gradually increasing the percentage of how much of it he can use. And he has been forced to adapt his fighting style. Development is what makes a character interesting. And I will be the first to admit, I will do nowhere near as good of a job at it than Kōhei Horikoshi has done.

However. I have come to the decision that I will be giving Izuku OFA.

And with this longer than I would've liked author's note: On with the story!

Normal Speech: "Nanites!"

Normal Thoughts: 'Nanites?'

All Might / Monstrous Quirks Speech: "NANITES?!"

All Might / Monstrous Quirks Thoughts 'Nanites!'

Last time on Nanite Hero Academia:

Walking along he felt his phone vibrate, and after digging through his pockets to find it, he saw that his grandfather was calling. Cautiously, Izuku brought it to his ear. "Hey Grandpa wha-" whatever else he was going to say was cut off when Sorahiko began yelling over the phone. "Don't you 'Hey Grandpa' me, Squirt! I saw you on the news, what were you thinking running into the frey like that?! You used your quirk without a license! Izuku do you have any idea what would happen if you hadn't gotten off lightly? You'd never have been able to become a hero, Squirt. You need to be careful." Sorahiko finished his rant with an audible sigh. "Look, I saw what you did, and while I applaud you for saving that kid. You have to think things through. Get back to the gym, tomorrow we'll step up your training. There's on year left until you can take the UA entrance exam. See you home, Squirt." The old man finished speaking, finally allowing Izuku to speak.

"Grandpa, I know what I did was reckless, but I stand by it.. Those pro heroes just stood there. 'Waiting for a hero with a better quirk' to come along and save the day. Just like when mom…" Even after all this time, even recalling that day hurt. "I don't care what others say, I tried my all to save that guy, and that's good enough to me. See you home, Grandpa."

Present time:

The train ride home was, uneventful. Coming down from two seperate adrenaline highs where he had the opportunity to flex his quirk had left him somewhat fatigued. Unsuprising given that he brushed closer to death than he ever had before, and forcefully converted not only a manhole cover but an entire streetlamp as well. And that had the young, aspiring hero enraptured in his own musings, his notebook lying on the table in front of him, the pen moving with deft swiftness as it tried keeping up with his low muttering. 'Converting entire segments on the fly like that is impractical, it left me far too more drained than I'd like, not mention given that they were newly created and that was done under stress, the energy output was sub par compared to my regular nanites. I need to make a point of keeping at least an emergency supply on me at all times. But how? Bracelets perhaps? Maybe a belt or something similar. What if I could use the nanites to create more nanites instead? It'd leave me free to focus on more important matter. Oh! What if I incorporated them into my costume like that one old Hero movie from before qu-'

The storm of muttering would've no doubt continued if not for another passenger calling him out for it. "Would you please pipe down? I'm trying to watch the news here!" And indeed, live news coverage from a disaster zone Izuku was quite familiar with was on display. A reporter on scene and doing their best to recount what had happened. "We are here live in downtown Shizuoka where twenty minutes ago a villain attack occurred. The villain in question possessed a mutation quirk that had turned their whole body into slime. This very same villain had earlier today robbed a convenience store nearby, but it seemed one evil deed was not enough for this ferocious fellon!" She reported, doing her best to look every bit as good for the camera in spite of her, at best, average coverage.

"Witnesses claim that the villain appeared suddenly and attacked a young middle school student, with the intent of forcing themselves into their body to take them over. Quirk specialists speculate that the villain could possibly have done this by forcing their body into the victim's veins. But as of now there is no way to know for certain how they planned to achieve this goal." On screen a video that looked to have been recorded on a phone appeared, shaky and blurry, but it was still possible to see the ash blonde, spiky haired student from earlier, struggling against the villain as he sent out explosions one after the other.

"The student in question seems to be in possession of a very powerful quirk, and used it to resist the villain until help arrived. I have Death Arms with me here on scene." She informed the camera after the video cut out, now standing next to a tall man with broad shoulders, a dark blue outfit which revealed most of his muscular torso. On his arms were a pair of identical bracers which looked incredibly heavy, and were covered in danger signs often found on construction sites. A belt and headband of similar design were also present. "Mister Death Arms. Can you walk us through how the ordeal was handled?" She asked, almost prodding the Pro Hero in the face with the microphone.

After clearing his throat and scratching his chin thoughtfully, Death Arms responded. "Certainly. First order of business after Kamui Woods, and the newly debuted Mt. Lady arrived on scene was to secure the area. We lead all civilians to safe distance to ensure they wouldn't be caught in the crossfire. This went almost flawlessly." The way he pronounced 'almost' made it clear that he was rather annoyed.

"By 'almost' are you referring to the kid who ran in while the pro heroes refused to?" The Reporter asked, not quite succeeding in hiding the giddy smile forming at the potential drama that might come from this. Death Arms, grit his teeth huffing in response. "Yes. The kid who wanted to play hero and nearly got himself and the other boy killed. If not for All Might." he added, refusing to even acknowledge Izuku's words to him earlier.

Izuku watched the pro hero with thinly veiled contempt. 'That stuck up prick!' he cried internally. Droning out the rest of the interview as he had no intention of paying the hypocrite any more attention. He turned back to his notes, never quite catching the subtle looks he was being given by another passenger with nigh skeletal features, sunken in dull blue eyes with black sclera, with long blonde hair and clothes that looked to belong to a body builder rather than a skeleton man. No, Izuku's focus had firmly returned to theory crafting his future costume.

Toshinori Yagi would be lying to himself if he said he wasn't curious about the green haired boy wonder. Twice he had put himself in harms way to thwart a villain. Twice he had gone beyond what any young man could ever have been expected to do. Twice he had held the line without expecting anything in return. When Toshinori had been unable to move himself to do anything, from the fear of reaching his daily limit as All Might, this boy had rushed in to save a life.

Toshinori had arrived moments before Izuku had, and had seen how the boy reacted to the Pro hero's reluctance to enter the fray when their quirks did not give them the advantage. Where they all sat waiting on their hands for someone with a better quirk to arrive. Toshinori included, Izuku had rushed in to save that boy. 'That boy is a hero, through and through. And perhaps, just what I have been searching for.' The skeletal man thought wistfully. The true, secret form of All Might continued observing Izuku in silence. And when the boy got up to leave, his stop nearing. Toshinori did the same.

Izuku was being followed. He could feel the eyes upon him. Studying him, the intensity was frightening at times. But the young aspiring hero refused to buckle under the pressure. Soon the whole world would be watching. With those thoughts in mind, Izuku deviated from his typical route, instead taking a slight detour through roads more seldomly populated. If he were to come to blows, the fewer civilians caught in the crossfire the better. Steeling himself, Izuku searched for a source of metal to convert, but fell short when an eruption of steam occured. And one of the most iconic lines of the century was uttered from Behind him. "I AM HERE!"

Behind him, stood All Might in all his heroic glory, a dazzling smile and blue eyes burning with confidence.

"All Might?!" Izuku cried out in shock. "Wh-what are you doing here?" He asked, a sense of foreboding washing over him. 'Is All Might going to lecture me about running in? Like Dead Arms did? Getting the disapproval of All Might… May as well end my career before it began if that was the case.' Izuku thought- and muttered at the same time, which resulted in All Might doing something Izuku had not expected. The Hero began laughing, a laughter which began as a mighty rumbling of thunderous chuckles, but around midway through, the hero was enveloped in steam, blood being spat out of his mouth in an alarming quantity.

When the smoke cleared, All Might was no more, in his stead: Toshinori Yagi. Izuku's eyes widened comically. "You're not all Might! A Villain?!" He shouted, already his eyes were scanning the nearest source of metal, but as he went to reach out for it, the skeletal man spoke. "Damn, seems my time limit has shrunk a little.. It's all right Izuku, It's still me. All Might." He said, his tone remorseful, somehow he seemed ashamed of himself.

"But… How?" asked Izuku, his mind having difficulties even beginning to wrap his head around this revelation. 'All Might is.. Anorexic?' the aptly named young Midoriya thought to himself, the sheer ridiculousness of the situation not having been lost on him. For if anyone had ever had the gall to tell him with a straight face, that All Might, was actually the perfect personification of the term 'Skin and bones'. He'd have laughed in their faces.

And it was with a deep sigh, the Number One Hero in the whole world responded. "Being a Hero happened." He responded in a somber tone, his left hand drifing towards his side, lifting up the hem of his t-shirt. Revealing a mess of scars which looked so surgical in nature it was doubtlessly opened with a scalpel, and stitched closed. Breathing deeply, the blond man continued his story. "Five years ago, I battled a Villian unlike any other. His powers were beyond measure, and his cruel cunning haunts my nightmares to this day. In our titanic clash. I was mortally wounded, half of my internal organic tissue was destroyed. My left lung, part of my stomach and intestines, heck even my kidney wasn't spared.." The last part was added almost as a sour joke, the hero chuckling hollowly.

"Five years ago? During your battle with Toxic Chainsaw? I never thought he was so dangerous as to do something like this!" Izuku couldn't believe just what he was hearing. All Might, wasn't invincible. It was unbelievable, it shook the very foundations of the society they lived in. The sky was blue, water was wet and All Might… All Might always saved the day. To think otherwise was foreign, and terrifying to consider.

Toshinori breathed out a laugh, a trickles of blood leaving his lips as he did. "You know your stuff kiddo. I'll give you that. Good guess, but no. It wasn't Toxic Chainsaw that did this, ruined my hairdo for a month or two? Yes, but he got nowhere near close to killing me. This fight wasn't made public. For good reasons." He said, an almost offended tone having been adopted when speaking of that small fry, Toxic Chainsaw, he was nothing compared to him.

"Then why.. Why tell me this? I'm just some kid you saved. Nobody special. Just another-" He would have continued had it not been for the pointed look All Might sent his way, swelling up into his awe imposing heroic form. "WRONG YOUNG MIDORIYA!" He roared, his somber, downtrodden experience having been replaced with the visage of Justice itself. The Pillar of Peace that held pup society. The brilliant smile threatened to blind the young teen. "Would 'nobody special' have rushed into danger that had left pros unable to move?!" All Might asked, pointing a finger at Izuku. Slowly, his form receeded back into the skeletal figure, this time more slowly, gradual. And where there was before a thick glob of blood being spewed out, only a single, thin trickle escaped him this time. But despite the change in appearance. The Brilliant fire in his eyes remained. That shining Azure roaring towards Izuku's own dazzling emerald orbs. "I saw you, you know. I know what happened. The same thing that happened to any great hero, the first time they saved a life. Your legs moved on their didn't they. By the time your mind had caught up, you were in the thick of things, right?" The Pro Hero asked knowingly.

Izuku could do little more than nod his head in affirmation, stunned silent by the Hero's admission. The soft green curls swaying from the motion. He wanted to desperately explain what happened, but his idol beat him to the punch. "You have a powerful Quirk, that much is true. But that is not all, that is needed. You displayed the willingness to forego your own safety to save another. Meddling where nobody would expect you to. That is the essence of what it means to be a Hero, young Midoriya. But I have to ask you. What is your goal? Why do you want to be a hero?" All Might inquired, already waiting with bated breath for his answer.

This time, Izuku did not hesitate. "I want to be a hero like you! Saving others with a smile! When they see my smile and my Quirk, I want them to feel that everything is alright! Because I am here to save them!" Though the use of his own immortal catchphrase amused Toshinori, he could not help but be taken aback by the sheer passion of the kid, but then, what he said next impressed him further, for Izuku wasn't done. "I want to make sure than no child ever goes through what I did.. To find their mother or any other person they care of has been snatched away by a Villain, written off as collateral because someone didn't get their way! I want to be a hero everyone can be proud of! Even you!" Izuku Midoriya was crying, in another life, this action might have been a common occurrence. But in this life, Izuku thought he had long since cried out the last tear, over his mother's grave. On the day he got his quirk.

"I already am." All Might answered, once more sending Izuku into shock. 'All might is proud of me?! My greatest hero is proud. Of. Me?!' Izuku had a hard time not believing it was a dream at this point. This couldn't be real! Toshinori meanwhile, walked closer, placing a comforting hand on his shoulder. "You haven't had an easy life, kid. But I believe that those hardships has made you who you are. A kind, honourable young man. One who I believe is worthy of succeeding me as the Symbol of Peace and Justice." He said carefully, giving Midoriya a gentle squeeze of his shoulders, though even now Toshinori couldn't help but feel a sense of familiarity when he looked at Izuku, a familiarity which made his sides ache in a way only one teacher ever had made him feel. But that did not matter right now. "I believe you. Izuku Midoriya, is worthy of receiving my Quirk."

The Number One Hero mentioning his Quirk, one of the most debated subjects of today's society, was enough to make Izuku's brain do a reboot, and with it, process just what had been said. "What do you mean, receive your Quirk?" he asked curiously. Still not entirely sure what to make of it. Toshinori took a step back, and extended his hand outwards, as if holding something. And then his hair began rising as if from an invisible wind beneath his feet. "I call it One For All. This power is like the sacred Olympic torch from ancient tradition. Passed down from carrier to carrier throughout generations. At its core, it's an energy stockpiling Quirk. Its power increasing with each new wielder. I am the seventh to hold this sacred torch.." He said, once more bursting into his heroic form. "And I ask you, Izuku Midoriya… Will you be the eight?!"

If Izuku's eyes had widened to comical proportions before, then right now they'd do everything in their power to try and burst from his skull from All Might's proposition. With all that he had, all the determination with which he channeled his passion towards everything hero related. With all the sheer stubborn unflinching resolve borne from his self imposed oath sworn upon his parents grave at the tender age of four years old, to be the greatest hero he ever could be. A fire rivalling, perhaps even dwarfing the one burning in All Might's gaze was set alight. Roaring with the intensity of a sun. Latent nanites bursting out, which began swirling around him in erratic patterns. With a smile that radiated confidence. Izuku Midoriya locked eyes with All Might, and in that moment. Determined the course of history. "I accept."

With the last vestiges of energy he could hope to channel that day, All Might couldn't wipe the wide grin off his face, even as he shrunk and warped into the skeletal form of Toshinori. "Such confidence. Hah! Just what I wanted to hear!" All Might declared proudly. A sense of ease had made its way into his heart, and it was as if a heavy burden had been lifted from his shoulders. 'A successor at last. Do not worry young Midoriya, I will do everything in my power to prepare your for the responsibilities that await you.' "But you are not yet ready to receive it." All Might said. "Though you are strong, your body is yet unable to handle the full power of All For One, as you are now, your limbs may just explode from your body. We will need to prepare you first… That is why I will personally train you!"

If someone told Izuku this was a dream, he wouldn't question it, in fact it seemed more likey than freaking All Might offering to train him… 'Training. Crap.' "That might be an issue.. All Might." Izuku admitted with no small amount of reluctance. "You see I have already made an agreement with my Grandfather, who is my legal guardian, to train me for UA. We'll have to explain it to him." He told his idol, already irked that he was no doubts bothering the Symbol of Peace and Justice.

All Might however, simply nodded his head in understanding. "Not to worry young man. I have already prepared for this. See I'll pose as a representative from All Might's Hero Agency, and claim that after seeing you in action, we've decided to offer you some help in your training. To make sure such a diamond in the rough will reach his full potential." he explained. And by his account it was a good plan. One that he was certain would work here, after all. Who could Izuku's grandfather be, that it'd present an issue towards him training with All Might?

Not really seeing the point in dwelling on the negative points of his grandfather being as stubborn as they come. Izuku nodded his head. And together the two made their way towards his home. As they drew closer, a sense of foreboding washed over one Toshinori Yagi. For they were approaching an old, worn building he was intimately familiar with. Beads of nervous sweat began rolling down his forehead. "Uh kid.. Do you live here?" he asked nervously.

Izuku had at this point taken note of the discomfort that seemed to be rolling off of All Might, and turned to look at him. By now they were approaching the front door. And just as he was about to give a response to the pro hero. The swung outwards. And a short figure with grey hair, wearing a costume made from a creamy white colour, with yellow gauntlets and boots, belt and cape, as well as a black domino mask to finish the ensemble. He also carried a cane, and as he looked at Izuku he began barking grumpily. "What took you so long? Did you take the long route to pick a fight with every creep squatting in an alley too, Squirt? And who is- Toshinori? What are you doing with my Grandson?" Sorahiko asked pointing the tip of his cane towards the skeletal man.

Both Izuku's and Toshinori's eyes widened at the old man's questions. As one they turned to the other and asked. "You know Gran Torino / Grandpa Torino?!" their mouths agape imitating fish. Toshinori went first. "Yes, he was my teacher.. And did I hear right did he call you his-" He explained, before posing the question. "Grandson yes. He's my grandfather and has been my legal guardian for, about ten years now… Wait teacher?!" Izuku broke out, his eyes turning to Sorahiko who was giving them both a rather pointed glare. "What the hell Grandpa! You taught All Might?!" he cried in shock.

"Get inside. Wouldn't want just anyone listening in would we… Numbskulls both of you." The old man grumbled. Still recovering from the revelations they were both given. They headed inside without a word. Izuku couldn't help but think. 'What even is today?'. And it was hard to blame him, this day had been a rollercoaster through and through. Sorahiko had already sat down at the dinner table, Toshinori and Izuku coming in to join him.

"Now, you." the old man pointed at Toshinori. "Explain just what is going on here. Why did you follow Izuku home?" He asked, though already he had a sneaking suspicion just what had occurred. After all, he could tell that Izuku had cried. Something that hadn't happened in give or take a decade. Something happened.

At this point All Might saw no point in lying, nor did he dare do so for fear of of his own health, to lie to Sorahiko. And instead explained to him what had happened. And that he had picked Izuku as his successor.

For quite some time. The retired hero sat in silence. Eventually he broke the silence by asking Izuku: "Are you certain you want to do this? Receiving his quirk will make you powerful yes. But it will also attract attention. You'll have to work that much harder." He did honestly not expect the boy to back down, but he was taken aback by the fire that shone in his grandson's eyes.

"I am. I want to help everyone I can. That includes him." the boy said, gesturing towards All Might. "He asked for my help in keeping the world safe. I refuse to break that promise." He declared, stating it as if it were certainties. And supposedly. It was.

"We'll have to up your training schedule even more." Sorahiko noted, a dangerous glint in his eyes. "It'll make everything we've done so far look like childsplay in comparison." Toshinori shivered as he saw the smirk stretching across the old man's lips. He knew what it entailed. But Izuku, Izuku simply grinned right back. "Hold nothing back." he said in a quiet, serious tone. "I want to be at my best when I take the UA entrance exam." He said. Impressing the two adults in the room with his resolve.

They spent most of the evening hashing out the details for his new, hectic schedule. Only stopping to get something to eat. When they were finished, they decided to review it one final time before calling it a night:

Every day aside from saturdays which were to be Izuku's rest day. He'd wake up at 5:00 am, and go for a 10km run to build endurance. While that didn't seem to bad for Izuku, as he was used to running long distances already, the intent was to up it progressively during the regime as he increased his stamina so too would the distances he ran.

Afterwards he'd report to Dangopa beach with All Might where he'd train his body by clearing out the trash. Without using his quirk. A point All Might stressed to young Izuku repeatedly. Afterwards on weekdays go to school, and spend the same amount of time on sundays to study for school. When he came home on mondays, wednesdays and fridays as well as sundays after studying. He'd practice combat techniques with his Grand Father, who would teach him how to fight, initially without using his quirk, and then with the quirk implemented. As they progressed however they'd begin working on implementing quirk use into it as well.

Tuesdays and thursdays were where Izuku would be allowed to get creative. Using the time to experiment with his nanites, he had been given almost free reign aside from either of the two dropping by from time to time for a checkup. As well as having been given an objective by his grandfather. Better. Faster. Stronger.

All that was left was putting the schedule into action. And they would be doing just that. Starting the day after tomorrow. And though Izuku wouldn't be allowed to train rigorously tomorrow. He had no intention of sitting on his hands. He had every intent to begin working on his costume. He couldn't wait.

So I apologize, I meant for this to include the training period at minimum. But that that wasn't where the flow of writing this chapter took me. And in the interest of making it cohesive in my mind, I'm cutting it off here. Rather than rush into the training and not give it the attention it deserves. So this ended up being a development heavy chapter instead. The calm before the storm as it were perhaps.

With that said, thank you very much for reading! I appreciate all the feedback I have been given thus far. And if you have any suggestion or questions, I'd love to hear them. Once again thank you for reading! -Tentemperor