Another offshoot of the 'Chasing the Rabbit' AU - written by Holliswriting! Inspired by said AU, and my Prodigal Son Story!

Everything had been normal, everything had been fine, until it wasn't.

The training camp had been going well so far, with everyone slowly but surely getting accustomed to Rumi's intensity of training - and if not accustomed to the training itself, than the pain and frustration that it was liable to cause - the group had been feeling at least some sort of progress over the course of the few days they'd been at camp. So overall, everyone was in high spirits.

Meal times were always a lively affair; no matter how grueling the training, after everyone had cooked together and sat down to have their meal, they always had at least enough energy to laugh with one another over their shared pain. That particular lunch - the one where things went from fine to not - had been no different.

As lively talk which echoed through the valley was roaring like always, Izuku had found himself sitting next to Rumi - as he did for every meal - talking and laughing, and just enjoying the presence of the rabbit hero he'd grown to care about so much. Their own companionship was a strange but accepted fact to the group of students, who'd been shocked into silence the first time Midoriya had sat next to the terrifying pro, but had since simply written it off as part of their new normal.

Was the sun up? Did gravity still work? Did Midoriya and Miruko sit next to one another?

All the same.

Which is why when something that did not belong in the groups norm appeared, they were taken so off guard.

One moment, nothing, and the next the air - the very space in which the group was sitting began to twist. A violent tearing sound bringing the strange occurrence to the attention of all those within the area, and setting the pros - as well as some of the more experienced students - on edge.

"Get back!" Eraserhead yelled, scattering the students as all of them fled from the strange hole in space.

"Villain?" Izuku cried, full cowl igniting his form as Miruko stood at the ready by his side. The hole suddenly and violently widened, making room for a figure to suddenly be shot through; blasting past all the present pros, the figure was thrown into the main building, crushing through the wall in a storm of debris.

"Bye bye," All present looked back to the hole, able to just make out the form of a deranged looking woman on the other side. Blood covered her body, and her skin was all a dull charcoal black - so much like the NOMU from USJ that Aizawa couldn't help but shiver. Her teeth were sharp and dripping crimson as she smiled past them, towards the figure that had launched through the building. "Haruken."

A thunderous, rageful scream echoed from inside the building, and suddenly the figure was back, blurring towards the rabidly closing portal with a howl that couldn't be anything other than insurmountable rage.

"Bye bye."

The portal closed beneath the man's fingers, and as he landed on the ground, he stood frozen, completely still, if only for a moment; as though the reality of what had just happened - whatever it was that had just happened - was setting in on him. Then, he began to shake, before roaring towards the sky.

"MAZARIN!"

Falling to the ground, the man, who now that everyone could get a closer look at - look at his back, anyway, as he wasn't facing them - was closer to a young man if anything, began violently thrashing against the ground. His fist left cracks in the earth where he buried it over and over again.

"Coward, coward, COWARD!" Looking up to the sky, the young man roared out once again. "You hear me you freak! YOU'RE A COWARD!"

The strange person began to catch their breath, and it was during this time that all those present, at least those who were capable, began truly sizing up the strange intruder - if they could call him that, as he was obviously not there of his own will.

His hair was snow white, except for the tips, which were the same color as the needles of the pine trees only a few yards off to the right. Coming from his head were a set of long, very familiar ears - rabbit ears - which followed the scheme of his hair perfectly. He was dressed in some sort of white and black battle suit which was a bit baggy at the legs and hugged tight around his upper body. It was also sleeveless, allowing the group of heros for a view of the many scars which lined the young man's arms. The suit was also very well worn.

Seeming to have finally regained control of his emotions, the stranger stood from where he'd collapsed to the ground, and turned to face them all.

Everyone flinched.

The young man's eyes, one emerald green, and one a scorching red, were beyond intense, and as they rolled over the group of heros and students, everyone knew it was more than just a look. It was a test. He was sizing them up.

He wore a metal mask around his mouth that was reminiscent of Midoriya's own, though it wasn't fully closed, and was designed to seem as though it was some kind of metal jaw - lined with sharp teeth and all. If you looked close, you could see the young man's mouth through the narrow slit between the two rows of teeth.

Eyes falling to a stop on Midoriya and Miroku, a small bubble of cruel joy - like grief and genuine happiness mixed together into one, bittersweet emotion - flashed in his gaze, and he began to laugh. Reaching back, slowly, as to not set off any of the battle ready hero's who were watching him, he touched something next to his ear, and the face mask retracted.

Everyone's eyes widened. From the students to the heros, as they all began to run numbers through their heads, because something wasn't adding up.

Because the guy looked stupid similar to Midoriya.

Tilting his chin upwards, the white haired young man gave a thin smile that sent shivers through Izuku's spine.

Because that was Rumi's smile, and suddenly the greenettes head began to spin.

"Guess I should introduce myself, huh, as odd as that is for me." Keeping his hands firmly where the heros could see them, he gave a small nod, speaking softly enough that only those closest to him - I.e Izuku and the pro heroes - could hear. "The name is Midoriya. Takeshi Midoriya. Please take care of me."

Holy shit.

"Don't you all think this is a bit excessive?" Takeshi rose a single brow from where he sat on the ground, arms and legs sufficiently tied up. "Come on." Eyes turning to Izuku, the young man groaned a bit, giving the greenette a wide eyed, pleading, heterochromatic puppy dog look that made the student turn away. "You know this is a bit much dad."

"Why do you keep calling me that?"

"Isn't it obvious? Thought you would be smarter than that pops, come one. I'm basically spoon feeding this one to you."

That may be so, but there has to be an explanation.

Eyes drifting to Rumi, who stood at his side, he couldn't help the heat that rose to his face.

"You say that, but we have no way of verifying your identity." Aizawa calmly stated, catching a bland look from the tied up teen.

"Sir, I am literally a mashup of those two right there." He gestured with his head towards Miruko and Izuku. "Like, if you went and asked those students of yours in the other room what they thought 'Rumi Usugaiyama and Izuku Midoriya's kid would look like, there's a pretty good chance the answer would be me."

Izuku couldn't stop blushing.

"Seriously," the boys' ears twitched in irritation, "What do I have to start spilling family secrets or something to get you guys to believe me? Take a blood test or whatever, it'll prove me right." The boy's eyes suddenly lit up. "Look! Dad!"

Izuku looked at him, but only because he knew that's what he was calling him.

Not because I actually believe him, or… Or want to believe him, or anything.

…

Who the hell am I kidding?

"I got grandpa's quirk… Technically. Check it out." Taking a breath and piercing his lips, like someone about to spit water, Takeshi's red eye began glowing, and he breathed outwards - and from that breath, a small stream of beautiful golden flame was born. Stopping, the boy gave Izuku a blinding smile. "See old man! It might have skipped a generation, ya weird mutation, but I got it."

That's… Hmm. There aren't many powerful elemental quirks out there, and I know for a fact that Dad was the only fire breather this side of the Pacific. That and…

There was a strange knowledge in the boy's eyes when he called Izuku a mutation. It was a term used for someone who had a quirk completely unrelated to their parents, and Izuku was technically classified as one, since One for All wasn't anything like minor telekinesis or fire breath. But the way Takeshi said it, was very pointed - at least, if one knew to be looking for such a pointed comment. The way he'd made eye contact, and depth in which he did, all said one thing.

I know.

"I believe you." Izuku decided, everyone in the room looking at him in shock. Takeshi smiled.

Ya, your message got across, don't worry.

"Thank goodness Pops, was worried there for a second."

"What, Midoriya-" Aizawa tried to reason with him, but the younger man cut him off with a look.

"I know for a fact that my father was the only one with a fire breathing quirk this side of the Pacific Ocean. I've checked. So the only way he's got it is through my own father, who's dead and buried, or me And, well…" Izuku cocked his head and gave himself 'ears' with his hands. "He's not wrong about the whole looking like us thing. That smile is so Rumi it's not even funny."

"So what, he time traveled?" Pixie Bob asked, finally getting involved, "Is that even possible?"

"You've seen time based quirks before right? With Aunt Eri?" The 'younger' Midoriya asked, giving them a quizzical look. "Is it really so far off that a not so nice person could get their hands on one, and I'd end up here?"

Mass confusion all around.

"Whose… Eri?" Izuku asked.

"Oh boy, I'm that far back huh. Good to know, good to know." Takeshi sighed. "Long story short, I am who I say I am, and I need to get back to where - or when - I came from. Pronto. Like, yesterday sort of fast." His eyes hardened. "It's really important."

"Well, unfortunately for you, even if you are who you say you are," Aizawa gave a sarcastic wave of his hands, "We're kinda short that kind of power kid."

"I'm not a kid, Eraser. So don't call me that." The boy sneered, shedding his previously lighthearted, friendly demeanor as he glared at the man. "And I can see that, I know that, but I don't think you understand the situation. I'm talking about the end of the world as we know it type shit. I need to get back."

"Why the rush?" Izuku asked.

"Why the - Are you SERIOUS!?" Takeshi sneared, "That thing, the one I was fighting, that sent me here, it's-"

"It doesn't matter what she is," Izuku interrupted, "her sending you back here doesn't mean anything if you find a way to make it back to the exact same time you left. You'd be losing no time, right? So why the rush? Why not take your time, plan, make sure your victory is secured?"

"That thing is not a she. And… " Takeshi's face spun into a deep rage, and a faint smoke began leaking from his nostrils. He took a breath, calming himself. "You're all heroes, you must understand how I feel. I'm part of the top three. One of the few remaining Pillars of our society, and I was just tossed out of one of the bloodiest, most dangerous conflicts in history! I can't just laze about and let that thing raze the world to the ground! It killed…"

Takeshi stopped, eyes suddenly dropping to the ground as he began shivering in rage once again. Tears dripped down his face and onto the floor, and the quiet that had been brought about by his yelling was suddenly seeped in darkness.

"How old are you kid?" Aizawa asked after the boy had quelled his tears.

"18."

The man sighed, and Izuku could see the thoughts that were running through his head, mostly because they were the same as his own.

18 years old and a pillar of the world. Like All Might, but almost as young as me. And that conflict, that person he was fighting - Mazarin - they sound… Terrible. He's a hero. My son. If he's anything like me, this is killing him inside.

Izuku scowled as he thought of it. What kind of hero was he in the future, that his son was forced to stand in such a position? Where was he? Where was the hero Dekiru, who saved everyone with a smile?

"It killed…"

Izuku's frown sunk deeper.

Am I dead? It's a possibility. A harsh but real one.

Being a hero was a dangerous profession after all, and it seemed that as the generations progressed, it was only getting more dangerous.

"So, what now?" Tiger asked, his gruff voice surprisingly soft for his usual tone.

"It depends," Takeshi began, "on whether or not this is my direct timeline, or if me being here has created a new one all together." The boys head cocked to the side in thought, or rather, decision. "Though, I guess my course of action is the same either way."

"And what is that course of action?" Rumi asked from beside the greenette as she stepped forward.

"Simple Mom." Takeshi cocked his head and gave an eerily familiar smile. "I'm going to do everything I can to save everyone."

If I had doubt that he was my son before, it's gone now.

"Hello everyone!" Takeshi waved kindly at all the students before him, smiling so gently at all of them he seemed like the complete opposite of the other rabbit eared person beside him. "The name is Takeshi Usagiyama! Otherwise known as the Sun Hero: Haruken!" The boy's smile was probably unseen behind his ferocious mask, however, so most of the students looked about ready to drop dead on the spot.

'Another Usagiyama? We couldn't handle the first, how are we supposed to handle a second?' That's probably what they're thinking.

The time traveler smiled broadly, making sure his eyes were as joyous and easygoing as possible, as to make up for his less than settling appearance and name.

Mom's probably already put the fear of God in them, so being friendly is going to be a challenge, but not impossible!

"Usagiyama you say? I didn't know Miruko had siblings?" The orange haired girl phrased it more as a question, so Takeshi answered it as one.

"Hero's are allowed to have secrets too, you know. Families can become targets to the enemies you make, so a lot of hero's choose to 'keep their cards close to their chest', if you catch my drift!" Takeshi eye smiled, and the girl blushed a bit.

"So you're a hero huh?" A blonde boy asked, whose hair looked more like that of a-

Holy crap is that Uncle Katsuki? What the heck! So weird.

"Yupp. Fresh out of an academy from the states!"

Not necessarily un-true… From a certain point of view.

"So are ya strong?" Uncle Katsuki asked, sizing him up in the same way Takeshi knew he'd made a habit of himself - at the direction of the very blonde before him. Smiling, the boy shrugged.

"You'll have to decide for yourself, now won't ya?"

Katsuki scoffed, and Takeshi's mother took command. Apparently, she'd been enlisted to help UA with their training regimen at camp - a motivator and hand to hand instructor, if you will - and just because he'd shown up didn't mean they weren't going to continue. If anything, after accepting his story, the two UA teachers seemed even more invested in getting their students up to scratch.

They'd gone with a pretty basic, if not far fetched, story; one that seemed much less far fetched than the truth, at least, when it came to the students.

He'd been battling a dangerous villain with a teleportation quirk, who'd caught him in an attack, and he'd been lucky enough that the murderer had sent him to his 'sister'. And now, he'd received info that the villain had been arrested, so he'd decided to stay and help out his 'sister' while he could. An easy enough cover story, but not nearly good enough to fool anyone with half a brain who caught sight of his face.

I look way too much like dad for it to be a coincidence. Someone - someone being Uncle Shoto, probably, the damn conspiracy theorist - will figure something out. It's best if as few as people as possible know, for safety reasons.

Looking over to where the Todoroki was training, a small smile fell onto Midoriya's features.

Doesn't mean I can't help them power up though. Stronger the better, as I always say.

So he would. He would help them get ready for the future that they had no choice but to embrace.