Chapter I

Percy still hadn't entirely come to terms with how he found himself in the situation he was now in; handcuffed to a table in a standard interrogation room not far from Mustafu, Japan. Of course, there was the fact that he was in a world not his own; one with superhuman abilities known as "quirks" and caped superheroes like the comic books and manga he read when he was a child. It was truly times like this when he wondered if the Fates ever truly had a plan or if they were making it up as they go along.

Flashback

"Hoo. Old hags… what can I do for you?" Percy asked as he floated in an endless, nameless void. Before him, three figures that he was all too familiar with appeared. Atropos, Lachesis, and Clotho, better known as the Fates had unfortunately been a constant in the demigod's life and, despite all the "troublesome" times in Percy's words, he neither hated nor liked them.

"Child of the Seas," Clotho began.

"Bane of Monsters," Lachesis continued.

"Bane of Titans," Atropos spoke with a savage grin.

"Bane of Giants."

"Survivor of Tartarus."

"Bane of Gaea."

"The Destroyer of Destroyers, Perseus Apollyon," the three sisters finished in unison. All four of them present very much aware of how the void itself seemed to quake at Percy's true name.

"Hmm," Percy began lazily with half-lidded eyes. "You three wouldn't come all this way for little ole me without a good reason. So please, keep it short, sweet, and to the point," he finished.

And Percy meant every word. They would have merely left him to exist in that void for the remainder of eternity unless something important had come up. He wasn't thrilled about it by any means, but he understood. After countless hours of meditation to cope with the bloodshed, conflict, and loss he had experienced, he had come to accept things as they happened. Perhaps not forgive and certainly not forget, but accept them and continue to move forward.

"This was not our doing," Clotho began once more in the highly annoying manner of speaking the three hags were famous for.

"Your string has been out of our hands the moment we started to weave it and you came into our world," Lachesis said with a nearly imperceptible sadness and frustration in her tone.

"Which is why we are here to send you along to the next step of your journey," Atropos finished with no attempt to hide her bitterness and spite over not being able to cut his life string.

"*Sigh* I gathered as much. How troublesome," Percy lamented as he craned his neck back to look at a sky that did not exist in the void. It was only a moment before he turned to look at the sisters once more.

"Where am I going and, regardless, you will ensure my family's safety and happiness, otherwise I'll find my way back to our world and kill you three myself," Percy threatened with a flare of his divine aura and patented wolf glare.

"The year you will be entering is 2145. Mortals have developed supernatural abilities called 'Quirks' that range from Transformation, Emission, and Mutant types. You will be near Mustafu, Japan," the Fates rattled off quickly after his temper calmed in an effort to keep it that way. Powerful they may be, but even they were in the dark of just how high the demigod's power would grow.

"Hoo? Superpowers are real, huh?," Percy questioned with an amused smirk at the mere thought of mortals with power. He had nothing against mortals as he was one himself after all; at least partially. However, Percy was under no illusions about the horrors mortals could and had created in his world without the divine world's help.

"I imagine you will take care of the… proper tasks to prove I exist in this world in the first place?" Percy questioned. He did not like the idea of having to make sure he could be identified in the new world he was headed to. It was too troublesome after all.

"Yes. Heroism is a profession and a popular one at that. We will fill your head with basic knowledge of the world so you understand how society functions, as well as your 'quirk'. The history of quirks you will need to obtain on your own," the Fates added.

Percy nodded slowly in understanding as he began planning his own contingencies for when trouble eventually found him. "Lodging?" Percy asked.

"You will come across a hero with a quirk that allows him to erase other people's quirks. He is a cynical man, but a good one nonetheless," they told him, and he raised an eyebrow about the Fates seemingly liking a mortal.

"I'm not going to get anything more out of you am I?" Percy asked and when he didn't receive an answer, he sighed heavily and muttered "troublesome" under his breath.

"Fine. Let's get this over with, you troublesome hags," Percy said with a sigh as his body began to glow brightly and light up the void.

"Oh! Also there are no divine entities whatsoever and we're turning you back to the age you started your journey in our world," the Fates added just before he vanished.

"Troublesome," was all that was heard before the void was dark and silent again.

There was another pregnant pause before one of the sisters spoke again.

"Do you think he'll be pissed that we set him up to appear right in the middle of a villain attack?"

"Most definitely."

Flashback End

So he had popped into existence right in the middle of his cousin Ares' equivalent in the new world he was in. A villain by the name of "Muscular" whose quirk allowed him to spawn muscle fibers outside of his skin and drastically increase his strength, speed, and durability.

The "Poor man's Ares" was on a killing rampage and about to kill two heroes known as the Water Hose Duo when Percy showed up and shielded them with water to catch the villain's attention. The bystanders and hero duo were horrified that a child (which Percy wasn't exactly thrilled about being again) had stepped up to defend them and thought he was to be another victim.

It was to everyone's surprise that in mid-monologue, Muscular received a devastating gut punch packed with the power of a 6.0 magnitude earthquake and promptly passed out with several cracked ribs and internal bleeding. The spectators were even more shocked when the child (in their eyes) proceeded to use his "quirk" to heal the injured heroes at least enough so they weren't anywhere near critical condition.

Other heroes arrived to the scene shortly after and detained him for illegal usage of his "quirk" and "interfering with hero matters", but Percy didn't resist; he merely muttered troublesome and allowed quirk-canceling cuffs to be placed on his wrists by the nice, but plain looking detective named Tsukauchi Naomasa.

It was while he was in transit to the police station that he began to meditate and compartmentalize the situation he found himself in, how much easier his abilities came to him, and how he would proceed. He decided to trust the hags one last time and wait for the hero they had told him about to show up at the station.

Percy had chalked up his increase in power to the fact that there were no divine entities within the new world he was in. They didn't feel like they grew in overall size, but potency; like there was no longer an interference barring them from him. It was an interference he never would've noticed if he had not been sent to a world without divinity, but it was the best way to describe the sensation.

Of course, he could've refused to go with the police and try his hand at understanding how society functioned while tracking down the hero he was told about on his own, but he figured since he saved two lives, stopped a psychopath, and was only 12 again (at least in body), the police would probably let him off with a slap on the wrist and call it a day.

And it was just too troublesome to leave.

So there he was in the interrogation room still waiting for someone to come and speak with him and even his meditation was waning. It was just as he was about to ask the people that were not so secretly watching him through the one-way glass what was taking so long that he felt three people approaching the door.

Well, two people and an animal of some kind for whatever reason.

LINEBREAK

Aizawa Shota was frustrated and relieved. Despite both of those obviously conflicting feelings, he also wasn't entirely sure he had ever been so confused in his entire hero career, much less his life.

Almost two years ago, a kid went missing. Jackson-Kamado Perseus, or as he figured he was addressed since he was partly American and spent the majority of his adolescence there, Perseus Jackson-Kamado. His mother was killed in a villain attack and his father never stepped into the picture after he discovered she was pregnant apparently.

The kid had long wind-blown raven black hair that was often tied back in either a low ponytail or a bun with three bells braided into it and admittedly mesmerizing sea-green eyes complete with hanafuda earrings with whirlpool motifs on them. The thing that stood out the most to Aizawa however, was the lopsided smile on the kid's face and the intelligent, yet lazy look in his eyes that practically screamed "I'm a problem child and your frustration amuses me".

Normally, he would've dropped the case by now. Nearly two years since his disappearance with little to no leads made it practically impossible to solve.

But something at the back of his mind was telling him that he needed to. It was almost instinctual. It felt as if this kid held all the answers to the secrets of the universe.

The only one Aizawa wanted answered was how to obtain a quality night of sleep.

Or the best cup of coffee.

Coincidentally, a second case he was working on with his long-time friend (not that he'd ever admit that out loud), Yamada Hizashi AKA Present Mic, was tracking down the villain Muscular.

Muscular was a menace that he hadn't expected to run into in his career as a hero, especially an underground one, but the man was a problem and one of the strongest, known to at least be somewhat comparable in strength to that smiling idiot All Might. If it wasn't for the fact that he was called onto the case solely for support and to make sure the psychopath couldn't use his quirk, he would have deadpanned at how illogical it was for him to get involved and go back to sleep.

Amongst the plethora of charges against him like robbery, theft, and as always, resisting arrest, the most notable was his kill count.

34 confirmed kills consisted of a widespread variety of people, including heroes. There was no real rhyme or reason to his victims; the mad man just wanted to kill people and so he did, but he was powerful enough to get away constantly despite the numerous notices about him and heroes specifically keeping an eye out for him.

It was the reason he had gained the moniker "The Carnal Murderer".

But the whole reason he was up until 4 AM the previous night looking over both cases again was because he dearly hoped that they weren't connected. A 12-year-old boy against a bloodthirsty madman was practically a death sentence. Aizawa was a teacher at U.A., the top hero academy in Japan; he may not have shown it to anyone but he cared about kids, especially his own.

Regardless of his musings, it was the instinctual gut feeling again. Something about looking at the two cases side by side just screamed at him that the kid waa going to get involved with Muscular, if he hadn't already. He just feared the state he would find the kid in when they did.

Aizawa was in his classroom (another class with no potential that he expelled) and had just downed another cup of coffee (he had honestly stopped counting) when his phone rang. Letting out an audible groan before he answered without looking, "Mic, this better be important."

Present Mic had a bad habit of both annoying him and calling him even when his own classroom was around the hall.

"It's Tsukauchi. We found the kid," Naomasa said quickly. It was only from the years spent working with the detective that he was able to detect the barest traces of relief in the man's voice.

Aizawa felt instantly awake, out the phone on speaker as he started to collect his gear.

"Where?"

"I have him down at the station. Along with Muscular."

To Aizawa's credit, he only paused for a moment with an incredulous look before he continued preparing.

"On my way," Aizawa ended the call and sighed heavily in both relief and exhaustion. His gut feeling had turned out to be right after all.

"Yes. Let us go forth and meet this interesting boy that has had you working later nights than usual Aizawa-kun!" A white furred rodent exclaimed as he popped up from within Aizawa's trademarked capture scarf. Aizawa had no idea how his boss had even gotten there without him noticing, but he was so used to the creature's eccentricities that he didn't even flinch.

"Dammit. He's most definitely a problem child," Aizawa muttered and did his best to ignore his boss's mad cackle as they headed to the station.

LINEBREAK

Percy had turned his attention to the door just before it opened and watched as two men walked into the interrogation room. The first was already recognized as the nice detective, Tsukauchi Naomasa, in his fedora and trench coat and carrying a notepad and coffee. He didn't mind the detective; he seemed like a good man that didn't get nearly enough credit for his work since heroes were like a bunch of brats in a beauty pageant clamouring for attention.

The second man looked like a hobo. He had long dark hair like Percy's own save the more natural and even spaced gray in it if one looked close enough and an exhausted look on his face. Percy's look was lazy, but that was by design; the homeless man simply looked done with life. He was dressed in a dark jumpsuit with a gray scarf that looked like it would do absolutely nothing against the cold and gold rimmed shutter goggles hanging from his neck.

It was also hidden in the scarf that Percy sensed the rodent.

The two men took the respective seats across from Percy, the new addition eyeing his demeanor the entire walk into the room and sitting down, but Percy was content to let him make his observations since he was doing the same in return. Percy noticed the cautious and alert gait for a trained combatant and the scanning gaze of seasoned one.

He had a gut feeling this was the man the Fates spoke of.

In the time that Percy and the hobo took to assess one another, Tsukauchi had finished preparing for the interrogation and opened his mouth to begin when Percy beat him to the punch.

"Why is there a rodent hiding in your scarf?" Percy asked with the subtlety of Mrs. O'Leary playing a round of "Maul the training dummy". He idly noticed that both men's surprise was genuine, but Tsukauchi's surprise was obvious while the hobo only slightly widened his eyes. Before either could make a comment, the rodent popped into view.

"Oho! You noticed me! Am I a mouse? A bear? A-," the now identified chimera began to… do a bit? Percy was sure the entire thing was practiced, but he had never been one to beat around the bush.

"Chimera," the demigod said simply and the room devolved into silence once more.

"Oh?" The chimera hummed with his interest severely peaked. The boy was enough to get his curiosity since his instincts all but screamed at him that the… being in front of him was dangerous, but the simple statement of what his species was made the boy have his interest.

"You're a chimera. Multiple species spliced into one. Probably a mouse, a bear, and a dog if the introduction was anything to go by," Percy said in a bored tone with a lazy gaze. There was silence once more before the chimera started to cackle wholeheartedly.

The detective took the lull in conversation to clear his throat and regain control of the interrogation. He also succeeded in drawing Percy's attention and gave introductions before he began his questioning.

"You're Jackson-Kamado Perseus, yes?" he asked with his quirk activated, not that Percy knew that in the first place.

"Mah mah. My name is a bit of a mouthful, so call me 'Percy'," Percy replied with a dismissive wave of his hand. It was an action that intrigued his interrogators as it came off much older than a boy of 12 years.

"Your quirk is called 'Umiko', yes?"

"Is that what they're calling it?" Percy responded in amusement with a slight chuckle, skillfully, but unknowingly using the loophole in the detective's quirk.

"Please stick to simplistic answers; yes or no," Tsukauchi stated with only a slight twitch of his lips to indicate a frown.

Percy sighed in exasperation, not quite from the reprimand, but because he had been waiting for so long and he didn't understand why the questions matter when they had his "file" in front of them.

"Yes, my quirk is called 'Umiko'," Percy obliged the detective, but the man's frown only became more prominent. It was something Aizawa and Nezu picked up on.

"Why are you lying?" Tsukauchi asked bluntly, but not harshly. Percy merely raised an eyebrow in response asking the silent question of how the man could tell. It was the detective's turn to sigh.

"I have already introduced myself, but what I didn't tell you is my quirk. It's called 'Lie Detector'. As the name implies, I'm able to tell when someone is lying," Tsukauchi elaborated and Percy hummed in acknowledgment.

"A perfect quirk for your line of work. Even if I think quirks are mostly overrated," Percy muttered, but it was loud enough for the others to hear, making Aizawa and Nezu raise an eyebrow in return.

"Because the quirk listed in that file is a cover," Percy told them without telling them more. It was a harmless way to have fun with them in return for making him wait.

"What is your quirk then?"

"I don't have one."

Aizawa sighed in frustration at what he believed to be the kid's reluctance, completely missing the blatant surprise on Tsukauchi's face and Nezu's feral grin in response to the detective's shock.

"Kid, we're just trying to help you here. We saw the footage of what you did. If you aren't going to cooperate with us then-," Aizawa started to say but he was cut off by the detective.

"Aizawa," Tsukauchi interrupted and drew Aizawa's attention to himself.

"He's not lying."

LINEBREAK

The remainder of the interrogation consisted of Aizawa being in denial at Percy's tale. A tale of gods and monsters and war, and how a kid no older than 17 destroyed a primordial force of nature on his own only after dozens of other impossible feats and the result of all of it was ending up in an entirely new world. Their world.

If it wasn't for Tsukauchi's constant confirmations that the kid was telling the truth, Aizawa would have thought that a coworker of his, Kayama Nemuri AKA Midnight, had conspired with Mic to slip something into his coffee again. That, or he would've called for the kid to be shipped to the nearest loony bin.

Watching the kid break out of quirk canceling cuffs with his strength alone and the fact that his own quirk had no effect whatsoever on the kid certainly helped.

After Aizawa came to accept the utter ridiculousness that was the problem child in front of him, he mentally rifled through the information presented to him and had one primary thought running around in circles through his head.

'What. The. Fuck.'

The secondary thoughts all revolved around his work both as a hero and a teacher of heroes.

'It's why I expel so many kids every year. They think they're invincible and that heroics is just a game, but this kid… he's been a hero from the first time he was 12 and didn't fight villains or criminals, but monsters, gods, titans,' Aizawa thought and tried to recollect himself, but it was proving difficult for one simple reason.

It bothered him. It bothered him more than he would ever admit it and he would only ever admit it to himself that the kid - 'No. He's not exactly a kid now is he?' - in front of him had been through literal hell, fought beings of unimaginable power, and saved his entire goddamn planet without anyone really knowing and would more than likely put all of his previous and future students to shame, both in sheer ability and mentality.

He was just a kid. Why did he have to deal with that shit?

"Fascinating. Absolutely magnificent," Nezu cheered and clapped his paws.

Percy merely hummed in response and enjoyed some of the tea that Nezu had pulled out of thin air part of the way through his retelling.

Before he began telling his story, he wondered if he should give them the truth or simply disappear into thin air. It was a quick decision to come to as he could easily tell that Nezu was far smarter than him, much like his hime, and he honestly didn't care. He wasn't arrogant and thought himself untouchable in the new world of heroes, but he had simply seen worse. He also thought it would be wise to have someone like Nezu in his corner should trouble find him like it usually does.

As for Aizawa and Tsukauchi? Well, he simply just liked them.

"So what now?" Aizawa asked and Nezu hopped on top of the table and started to pace.

"Well, I have a plethora of combat experience. Even if the…power scale of this world is likely a bit lower than my own," Percy started with a shrug.

"There's also the fact that now that you all know the truth, I doubt you'll let me out of your sights. Especially Rat Satan. I can already smell the ultimatum of going to his school once I'm of age or facing criminal charges for saving the two heroes earlier," Percy continued with a deadpan look at the still pacing chimera who didn't dignify a response.

"I guess I'll be a hero again. At least this time it'll be somewhat intentional," Percy finished with a sigh and muttered "troublesome" under his breath before Nezu finally stopped pacing.

"Excellent! In the meantime, we will have Aizawa-kun act as your legal guardian and supervise your training. I'll need to do an assessment of your knowledge, but enrolling in a school next week shouldn't be an issue," Nezu said quickly and cheerfully, ignoring the grumbling from Percy and an afronted look from Aizawa.

"Wait a minute! Don't I get a say in this?" Aizawa asked and Nezu laughed again.

"Please Aizawa-kun. Percy-kun here will be easier to take care of than a cat and I'll give you a pay raise," the rodent said and Aizawa grumbled, but didn't argue.

"As far as school, throw me in a mediocre public school. I'm not one for special treatment or standing out," Percy said and Nezu nodded, already metally sifting through schools he knew would fit Percy's request to enroll him in.

"You are welcome at U.A. anytime Percy-kun. I will notify the staff of your presence as Aizawa-kun's young charge. So long as you don't interrupt any classes unless told otherwise, use the facilities as you please, just try to limit damage to a minimum," Nezu told Percy and he offered a lazy smirk.

"Hai hai~."

"Just like that?" Aizawa asked in disbelief which was mirrored by Tsukauchi. The poor detective was still rebooting as had crashed through the demigod's explanation.

"Of course dear Aizawa-kun. I can already tell Percy-kun isn't like the humans I despise considering he is only half human. I have to alter my plans for world domination now," Nezu said cheerfully and started laughing maniacally.

"Make me your right hand and let me punish anyone who pollutes the seas and I'm sold," Percy quipped and chuckled along with Nezu.

'Kami please help us all,' Aizawa and Tsukauchi both thought with a sweat drop.

Finally, Tsukauchi had recovered enough to rejoin the conversation. "You do realize I have superiors that I need to report to about… all this," he said and gestured to everything in the room, but mainly Percy.

"I'll handle it," Nezu said with a dismissive wave before blackmailing the detective's secrecy for rather obvious reasons.

LINEBREAK

The week passed without issue for the four that knew the truth and was filled with shopping to secure Percy's supplies and the knowledge test with Nezu. It turned out that Percy was fine in terms of language, mathematics, and science, but had no knowledge of history for obvious reasons, but was able to pick up enough for the appropriate grade he was entering with Nezu's tutoring.

Percy also picked up his training regiment to get used to his 12-year-old body again so he could regain his strength as soon as possible. He was even joined by Aizawa on occasion and helped the man refine his hand-to-hand combat further and grow stronger as well.

Alas, it was time for school and he had already grabbed his schedule and was headed toward his homeroom at Aldera Middle School. It was truly a backwater public school, but everything Percy was both looking for and expecting to maintain a low profile.

So with his uniform on (which he hated) and music playing in his headphones, he knocked on the door to his classroom. The door that would open to the next step in his adventure and his new life.

The door that would introduce him to his first student and his sworn brother.

He was really just hoping for no demon math teachers.

Chapter I End

AN: Rewrite of the first chapter with several changes. OOC Percy and yes I'm overhauling the whole story. It shouldn't be too different overall, I just wanted a fuller scope of Percy's abilities that way I didn't pull something out of my ass and had everyone like "since when can he do that?!"

I also didn't like him giving up his last name so I fixed that. Should follow canon MHA more or less until Final Exam Arc where it really starts to diverge. Again this is a highly indulgent fan fic EMPHASIS ON FIC. If you don't like it then don't read it. Feedback and comments are welcome, but if you're going to comment about someone else's comment just to harass them, just don't do that shit. It's annoying.