A Different But Similar Assignment

Summary: OC REINCARNATION FIC. It wasn't expected to work, just R&D humoring some wacko Celestial Dragon who wanted immortality for himself and maybe his fellow World Nobles. But this time, the experiment went right, although in a way that wasn't expected. But just because they are in a new world doesn't change the fact that they are still soldiers of Justice. They'll just be Heroes rather than Marines now. WARNING: Six Arts and Haki are in play, if you don't want to read about high school students bringing copious amounts of whoop ass onto villains, then move along. (Then again, if that's the case, then why are you into My Hero Academia in the first place?)

1. The Experiment

Story Start: One Piece Universe, Marine Research and Development Headquarters, Roughly A Century And A Half Before Roger's Last Voyage

Four Marines stood in a line at attention inside a lab filled with futuristic looking equipment. They were equally split between males and females, but that was where the equality ended. Three of them were Devil Fruit users and those same three were Rear Admiral ranked. However, many would be surprised to learn that the only non Devil Fruit user among the small group was a Vice Admiral, a rank above his compatriots.

Said Vice Admiral was one Tairyn Eido. With dark brown hair and green eyes, he was forty five years old and fought with a bo staff that had a mechanism to pop out tanto blades from both ends if he needed a little more punch. He knew the Six Arts and both Observation and Armament Haki but his greatest weapon, what had allowed him to come on top of several Devil Fruit users was his analytical mind that allowed him to find ways to get around those pesky powers.

The other male was thirty nine year old Rear Admiral Kano Yamidoshi. Bright green hair and neon blue eyes, Kano's appearance was as shocking as his Devil Fruit: the Zap Zap Fruit. While not as powerful as the logia version of his element, Kano's electrical discharges could still cause all kinds of havoc to an enemy's body, from short circuiting the nervous system to inducing cardiac arrest.

Rear Admiral Racheil Piern was forty four years old and had long blue hair down to her waist and kind brown eyes. Disaster relief were her preferred missions but she could be absolutely deadly with her Float Float Fruit abilities when the situation called for it. She had at one point floated ten galleons of a Pirate Fleet up to the air then flipped them upside down before hurtling them into a nearby island when the leader of the fleet had dared to say that after he beat her he would be allowing his men to enjoy her. Needless to say, Racheil hadn't been amenable to that arrangement.

The final Marine was thirty one year old Rear Admiral Kyoko Uriel. Kyoko had knee length brown hair with forest green streaks dyed into it and sharp green eyes with rather large pupils thanks to her fruit. A Zoan, Kyoko had eaten the Frog Frog Fruit, Model: Goliath, and you did NOT want to be the recipient of one of her powerful kicks. At one point during her career she had knocked over an entire ten story clock tower in one kick due to bandits having used it as a combination hideout/sniper's nest to pick off a town's population. Her tongue was also rather strong, and quite dexterous to boot.

Like Tairyn, all three Rear Admirals were also proficient in the Six Arts and the two 'common' forms of Haki.

Standing in front of them was a man who all but screamed stereotypical doctor, square glasses on his face hiding his brown eyes, short cut black hair, white doctor's coat over blue medical scrubs, and a clipboard held in his right hand. The man glanced at the papers on said board for one last time before he nodded and put the clipboard down on a nearby table and said "Marines, at ease."

The four smoothly shifted into Parade Rest and the doctor adjusted his glasses as he said "My name is Dr. Aichoko. You have been brought in because you four take missions that aren't deemed important enough for a Cipher Pol cell but are still too dangerous for "normal" Marines to handle, making you all highly valuable assets to the Corps." The doctor made finger quotes at the word normal before he straightened just that little bit more and said "You four are among the best of the best, your dedication unquestionable, it is more likely that you will die in uniform walking down a Marine base at the age of ninety then retiring. The Marine Higher Ups appreciate that kind of commitment to the Corps and would very much like you to continue that service if at all possible. Which brings me to what we are trying to do here."

All at once, the professional yet still somewhat affable demeaner of the scientist suddenly turned exasperated and he pinched the bridge of his nose as he said "Five years ago, a Celestial Dragon apparently learned about the Immortality Operation of the Ope Ope Fruit and decided that he rather disliked the thought of dying. This man decided that it would be perfectly acceptable to assign World Government and Marine resources in discovering other ways to make him immortal while Aegis Zero looks into acquiring the actual Fruit. Course, whether he's willing to share this hypothetical method with anyone not a Celestial Dragon, or even keeps it all to himself is up for debate."

Dr. Aichoko adjusted his glasses as he said "Some of my colleagues are already looking into extending the time a human body can function, but I've decided to take a more esoteric route in my research, turning to reincarnation for inspiration. I believe that it might be possible to bond a person's memories to their soul in order to enable a person to retain the memories of a past life after they have gone through a reincarnation cycle. Which is where you four come in. As I have said before, you four go on rather dangerous missions where the chance of death is quite high. However, if this procedure is a success, the Corps will not permanently lose your services if one of those missions claims your life. To that end, after the procedure, you will be given a set of instructions for what to do when you recruit again so that way you don't have to start at the bottom of the command chain on your second time joining. Any questions so far?"

The four Marines trade looks with each other before the Vice Admiral glanced back at the doctor and asked "What does this procedure entail Doctor?"

As the doctor began going into a detailed explanation of what the four were about to go through, none of them could imagine the results that would come from this experiment.

Time Skip: Twenty Years Later, Gola Gola Island, New World

The beach head by the main port town of the island was a war zone. The Giant Warrior Pirates had set their sights on the island only to immediately run into Marine resistance in the form of Vice Admiral Tairyn Eido and his men who had been there restocking their ship. Any other pirate crew would have turned tail and ran after learning that there was a Marine presence on the island. In the New World, Marines weren't the cannon fodder that could be found in the Blues, and were AT LEAST three steps up from Paradise Marines. And a Vice Admiral on top of that? Suicide was a good description for any conventional pirate still willing to launch their raid. But these pirates weren't conventional by any definition of the word, they were giants from Elbaf and they relished a challenge, the greater the better.

Tairyn Shaved out of the way of a massive great axe that created a mini canyon in the beach head, his right leg flashing as he launched a Tempest Kick at the shaft directly below the axe head. He tsked when the wind blade only dug in a sixth of the way through the dense wood and the giant laughed boisterously as he said "What's wrong little man, getting tired?" He then sneered and said "You won't be ruining my weapon like you did Tharja's spear!" The giant whipped his axe to the side and Tairyn had to quickly leap up in the air with Moonwalk to avoid getting swatted.

Landing, Tairyn panted hard for a moment before he gained a sneer of his own and said "If the weapon won't break, then maybe the wielder will!" Not trusting his limbs alone to have enough power anymore, instead whipping his staff off his back and unsheathing the top blade end, Tairyn launched a flying slash at the giant who widened his eyes and tried to get out of the way. His neck was still sliced into but it was four inches away from the all-important jugular, rather far for a human but dangerously close for a giant.

The giant clapped his free hand over the wound and snarled out "Bothersome pest!" Not bothering with his weapon this time, the giant kicked out with his foot and without time to dodge, Tairyn quickly crossed his Armament Haki'd arms. The impact launched Tairyn a good thirty feet inland, the Marine tumbling through the air ten times before he slammed back first into the trees a hundred feet from the waves, having been thrown seventy of those hundred feet.

The giant shook out his foot a little as he said "Tough little bug, felt like kicking a boulder."

Dropping to the ground in a crouch, Tairyn brought a hand up to his mouth and coughed, blood coming out of his mouth. Armament Haki or not, that kick had nearly snapped his bones like twigs, fractures going from one end of the bones in his arms to the next, and he was pretty sure multiple ribs were also cracked from where his arms had been slammed into his torso. His softer organs were even worse going by the red now in his hand. Taking the small break to glance at where his men were fighting, Tairyn frowned as he saw them barely hanging on, Haki, some Six Arts usage, and every other damn trick in the book being used to keep the giants from moving from one spot and going after the town. His men had already dropped five giants so far with crippling injuries and he had dealt with another four by himself but there was a literal boatload more to deal with, and they had come in a BIG boat.

Turning back to his current opponent with a glare, Tairyn spat a glob of blood to the side and said "Right, I've officially run out of time dealing with you."

The giant in front of him gave a booming laugh and said "Big words from a little man who looks to be two seconds from passing out!"

Tairyn gave a single snort before he backflipped halfway up the tree trunk he was in front of before pushing off of it as hard as he could going up at a diangol. Shave and Moonwalk combined as he appeared right in front of the now startled giant's face and his Haki black spear took out his right eye. The giant bellowed in pain and dropped his axe in his right hand which shot up to clap over the wound and Marine but Tairyn quickly yanked his weapon out and spun along the nose to get the left eye as well causing his opponent to let out an even bigger roar of pain. Enemy blinded, Tairyn dropped back to the sand and unsheathed his weapon's second sword blade. Gritting his teeth, he began rapidly spinning the staff in loops on either side of his body, launching a barrage of wind blades at the giant's upper body, aiming for the spot in between where his forearms were covering where his lungs were but not his heart. Unable to defend himself from the attacks he couldn't see, the giant had no choice but to take the fifty wind blades and blood rapidly poured out of the massive trench carved in his body. The giant fell to his knees and Tairyn quickly shaved to the side as the now corpse finished its fall, the upper body slamming down onto the beach with a minor tremor.

Tairyn panted before he gave another cough, this one much harsher, and Tairyn gasped out "Ten down." Idly wiping the blood on the hand he held to his mouth onto his pants, Tairyn began to stagger to the main part of combat only to pause as one of the giants there finished turning around and leapt towards him. The giant, who Tairyn recognized as Dorry, one of the co captains, grinned down at Tairyn, giving a bellowing laugh and said "Gegyagyagyagya! Well now, it seems that sending only five of my crew to face you while we dealt with the rest of your men was a mistake! But with you on your last legs, it shall be easy to stop you now!"

With those words Dorry swung his massive Terry Sword down. Tairyn dove to the side, rolling back to his feet with the blade slamming down a bare foot away from him. Forcing his body to move through adrenaline aided willpower, Tairyn leapt up on the back of the blade and began running up it only to have to dive off when Dorry's shield slammed down where he had been. Laughing, Dorry said "Gegyagaya! You won't be able to use THAT trick on me little one, I already saw a human try it three years ago and it hasn't worked since!"

Tairyn panted heavily for a moment before he suddenly smirked and said "You're wide open."

"Huh? No I'm not." Dorry said, cocking his head in confusion.

Tairyn proved him wrong by suddenly Shaving, reappearing in between Dorry's wide spread feet and leaping upwards, flipping to slam a blackened foot into Dorry's groin region, his kick away only adding insult to injury. Dorry's weapons fell from limp hands that moved to his groin as he slammed down onto his knees with a keening wail of pain and a muttered "Right in the longboat."

Tairyn tiredly chuckled before he coughed up more blood and said "Not so easy to deal with me as you thought, is it?"

Dorry gave him a pain filled glare and whimpered out "I can't believe you aimed down low like that. Who's the pirate here, you or me?"

Tairyn smirked and said "I don't know what you're talking about, there was nothing 'low' about my attack then, after all, I had to jump quite high for it."

Growling, Dorry reached for his weapon and staggered up to his feet as he growled out "I am going to make you greatly regret that!"

What followed was ten minutes of morbid whack-a-mole, with Dorry doing his best to stomp Tairyn to paste with his feet or try to slice him in half with his sword while Tairyn did his best to avoid said attempts while launching Wind Blades whenever he got the chance, most of which Dorry managed to block with his shield, though he couldn't protect his legs as well as the rest of him leaving his pants rather tattered and small cuts covering the legs, some of them deep enough to actually trickle out blood. However, that damage was minimal and Tairyn was the one coming out worse for their exchanges, his need to keep moving doing his battered organs no favors. Right now, the only thing keeping him going was adrenaline, will power, and the need to keep at least one of the Captains busy in order to keep him from helping the others that were still fighting his comrades who were bravely fighting on, managing to take another two giants out of the fight through teamwork, though Marine casualties were beginning to pile up at an alarming rate given that the other Co-Captain, Broggy, was still fighting on that front with the rest of his crew.

Fortunately, at the end of those ten minutes, help arrived. A sudden bombardment of cannonballs exploding against the Giant Warrior Pirates' ship drew everyone's attention to the sea where a trio of Marine battleships were charging in. Dorry tsked to himself at the sight before he looked down at Tairyn and said "Well brave warrior, as much as I would love to continue this, we must retreat if we are to keep our ship from becoming too damaged. But know that we shall spread tales in our halls of how bravely you and your men have fought this day. Giant Warrior Pirates, fall back!"

Most of the Giants grumbled, but they all quickly rushed for their ship, grabbing their fallen as they did so. The three Marine battleships continued firing on them as they quickly got the ship moving, some of the crew returning fire as soon as they could. As two of the Marine vessels chased the pirate ship out to sea and beyond, the third vessel came as close to the beach as possible before Marines swarmed off of it in longboats, a small number of medical personnel taking the faster route of Moonwalking to shore.

Meanwhile, as soon as all of the giants were off the shore, Tairyn and his remaining men collapsed to the sand, adrenaline abruptly cutting off and more than a few of them groaning in pain as they could finally feel just how injured they were. Tairyn's eyes were shut as he began coughing blood almost nonstop, but even then, he knew who the person rushing towards him was before she worriedly called out "DAD!"

"Tana, check the others first." Tairyn said, waving his less bloody hand towards his men.

The nineteen year old brown haired and eyed Master Chief Petty Officer shook her head sending her midback hair waving as she said "The others are helping them dad, and you need help as well."

Even as his daughter began doing what she could, Tairyn chuckled and said "Afraid there's not much you can do kid, not with how bad my insides feel. I'm pretty sure it's time for me to clock out."

"That's not an option dad. We already lost mom, I'm not losing you too, not when I can do something about it!" Tana said fervently.

Feeling moisture hit his face, Tairyn finally pried his eyes open. Seeing the tears that Tana wasn't bothering to hold back even as she briskly worked on his now opened chest, Tairyn struggled to place his right hand on his daughter's face and said "Tana, our family…knew the risks when we became Marines. My life…in exchange for keeping…the lives of those who…cannot defend themselves from being…lost has always been a price...I have been willing to pay, and the same…is true of everyone who fought on this beach today. This day is just when that price is due."

"But it's not fair!" Tana said, her actions becoming even more desperate as Tairyn's words became harder to get out and his hand weakly fell back to the sand.

Tairyn's lips quirked upwards and he said "Life rarely is fair…my daughter, but I need you…to be strong enough…to continue on, to keep…helping others. Can you…do that… for…me?"

Tana gave a small hiccup and briefly took one arm away from her work to clear the tears clogging her vision before quickly bringing it down to her bag to grab another tool for her emergency surgery and said "I'll try dad." The determination from before returned to her eyes as she said "But not today. Soon as I get you stable, we'll bring you to the ship's infirmary so just hang on a little longer."

Tairyn gave a hum but couldn't say anything else. The last thought he had as darkness closed on him was 'Sorry Tana, it looks like this ship is sailing after all.'

Scene Change: My Hero Academia Universe

A tired but content Inko Midoriya smiled down at her newly born son as she held him in her arms. By her side, her husband had a proud look as he said "Well done Inko, he's perfect."

"Yes he is." Inko said happily, lightly brushing a strand of green hair away from her son's forehead.

The action caused Izuku Midoriya to stir and briefly open one eyelid revealing a green eye. As the eye closed again, the newborn had a single thought before falling asleep again.

'Huh, looks like the experiment actually worked.'

END

Author's Notes: Update Schedule and Poll on Profile

I apologize for how long this took. When my work went from a twenty four hour store to only having two shifts I went from a work four days off three days a week schedule to a work five days off two days schedule which has made having time to actually do anything after work a bit of a challenge. Didn't help that I was writing without anything as a foundation for this first chapter. Here's hoping Engineer's next chapter won't fight me so much.

One last thing, update requests. Look, I get it, you guys like what I write and want to see more. But please do me a favor and send those via PMs rather than wasting a Review slot. Also, just putting it out there, but I'm pretty sure the answer to when something will be updated is always going to be when its turn comes up. I have a schedule, anyone asking for a new chapter from a story that I JUST posted is going to be waiting for a while so please be patient. I am trying to avoid going whole months without posting anything like when I first started writing but there are other things that also take up my time so some delays are unfortunately inevitable.