Outsider Chronicles: Split/Second Hero

Getting reborn into a world of superheros is annoying. Eh, at least I get awesome powers out of the deal. Now if only I didn't have that bloody line in my head...

Yeah, shouldn't be starting this but I don't give a damn. My Hero Academia is awesome and I can't resist. Enjoy!

Chapter 1

When I found out I had been reincarnated, I had mixed feelings. On one hand, I wasn't dead, so that was nice, but one the other hand, I was a baby again and there's a bloody good reason that you don't remember that! Still, there was one good thing that came of my new life. The world I had been reborn into is FUCKING AMAZING, if a little dangerous. After all, with people with powers running around, its only natural to be worried. So, which fucked up world full of Supers have I been reincarnated into you ask? Marval? DC? Nope, try My Hero Academia. This is gonna be so fun!

I had a brief heart attack after I discovered that my Parents were part of the 20% of the Quirk lacking population, but after I accidentally ran all the way to school in faster than the bus, that worry was quickly dropped. Yep, my Quirk is super speed. Kinda ironic seeing as my name is Setsuna. Of course, there was a lot more to my Quirk than just letting me run fast. From the day I gained the power, my body rapidly started adapting to it, granting me enhanced durability to withstand the g-forces from my speed, boosting my perception speed and granting me an enhanced brain that could actually work at my high speeds without slamming face first into a wall. Of course, all that came with a minor issue of sending my metabolism through the roof. On one hand, I healed quickly and would never be fat, on the other, it sent my appetite through the roof. Its a damn good thing that the Government had a method of dealing with Quirks that had that effect with a type of medication that allowed me to function without eating an entire supermarket worth of food every day.

Unsurprisingly, as I got older and my body got stronger, my max speed increased. When I first got my power, I was capable of outrunning trains. A year later, I could break the sound barrier while pushing myself, although it did do a real number on my body to move that quickly. One year later however, my top speed had increased again, landing me squarely as the fastest thing on two legs seeing as I could now break mach two. It was at that point that it was discovered that it wasn't my top speed that was increasing but rather my bodys ability to handle that speed. According to the specialists we talked to, my top speed was actually theoretically unlimited, but my body couldn't stand the force of the speed past a certain point until it got stronger.

My growth continued at that rate with the only things slowing me down being the fact that my clothes couldn't take it and burst into flames and the fact that running at mach speed in a built up area tended to blow out windows and blow people off their feet. Still, hitting someone with the force of a bullet is still more than enough to take down most villains. Speaking of, with great power comes great responsibility etc, so I was definitely intending to head off to Hero School.

"SETSUNA, WAKE UP YOU LAZY BUM!"

I groaned as my mother's voice echoed up the stairs, rousing me from my slumber.

"Five more minutes," I groaned.

"NO, NOW!" shrieked Mum, "OR HAVE YOU FORGOTTEN THE EXAM IS TODAY!"

"I swear that woman has super hearing," I muttered as I slowly pulled myself out of bed and slogged to the bathroom to wash up.

I washed my face, not bothering to come my hair when it'd just spring back up once I'd refueled in a bizarre quirk of my...Quirk. With that done, I quickly got dressed in my old uniform that I'd (hopefully) be switching out for the UA uniform in a few weeks, catching a brief glimpse of myself in the mirror as I did. I was slightly shorter than average, with a slim, streamlined build that came with my Quirk. My hair was blue and currently laying limp around my head with a black bang between my eyes, but it'd spring up into a mass of spikes after breakfast and my eyes were a brilliant, emerald green.

Once I was dressed, I headed downstairs, slipping what looked like a box of mints into my pocket as I went that was actually full of the energy pills I used to keep my energy levels from bottoming out. I swallowed one of them as I headed downstairs, ignoring the rush of energy and the way my hair sprang up into its usual spiky style. I entered the kitchen where my mother was busy cooking breakfast. My Mum, Asuna, was a rather short woman with a slim build, blue eyes and long, black hair she wore in a bun. She was a housewife and tended to wear a pink shirt, blue skirt with a short apron of the top and fluffy bear slippers I'd got her for Christmas a few years ago after her old (bunny themed) ones fell apart.

"So Setsuna, you ready for the exam today?" she asked as I sat down.

"Yep," I said, "This won't be a problem."

"I still think that super speed brain of yours is cheating," muttered Dad as he stepped into the room, adjusting his tie as he did.

Where my Mum is small and slight, my Dad is, in a word, massive. Hes very tall for a Japanese person and built like a brick shithouse from countless weekends in the gym and the workouts he did in our spare room, which had been converted into a small exercise room. He worked as a sales executive for a a tech company that developed technology specific for certain Quirks for Heros to use.

"Not like I can do anything about it," I said around my toast.

"True. Anyway, best of luck."

He ruffled my hair, which immediately sprang back into its usual style, before kissing my mother and leaving.

"You should go as well," said Mum.

"Why? I could run there in less than a minute," I said.

"Yes, but that'd ware out your trainers, even with the reinforcements," said Mum, "Besides, you shouldn't run everywhere. Save your energy for the exam."

"Point taken," I said, "Right, I'm going. See you."

"Have a good day and good luck!"

I followed my Dad out the house and headed down the street to the bus stop. One bus ride later (which was slow enough that I seriously considered getting off and running considering I could outrun the bus at a leisurely jog by this point), I finally reached UA. I paused for a moment outside of the gates, gazing up at the massive tower of glass and steel that served as a beacon of hope for the regular folks of the world. I was jerked out of my thoughts a moment later when someone barged past me.

"Move," growled the person.

I looked and was unsurprised to see it was Bakugou, the arrogant douche. I was momentarily tempted to use my speed to trip him or something, but quickly discarded the idea. I'd have the opportunity to humiliate him later. I took a step forwards and blitzed down the path to the front doors in the blink of an eye, coming to a stop as if I'd walked the whole way, ignoring the faint smell of burnt rubber that was now wafting from my shoes as I entered the building.

"Wow, your pretty quick," said a voice from the shoe lockers.

I turned and recognized the speaker as Tsuya Asui, the frog-like would be hero.

"Yeah, I know," I said as I peeled my shoes off and checked the bottoms.

They were reinforced to be able to withstand high speeds, but even then they didn't tend to last longer than a couple of months due to my unfortunate habit of subconsciously using my Quirk at random times.

"That doesn't look good," said Tsuya, eyeing the worn out shoes that had melted.

"Understatement," I said, tossing the ruined shoes into a nearby bin, "I really can't wait until I can get some hero grade gear so this doesn't keep happening whenever I go for a jog."

"That was a jog for you?" asked Tsuya, looking slightly shocked, "I didn't even see you move."

"Well, my Quirk is Super Speed, so its not that surprising," I said.

"Point taken."

"I'm Setsuna Yuki by the way," I said.

"Tsuya Asui, but you can call me Su," said Tsuya, "I have to ask though, how fast are you if moving faster than the eye can track is a jog?"

"Oh, last time I checked, my max speed without destroying my body was Mach 11," I said as I started heading to the hall.

I paused when I realized Tsuya wasn't following and turned to see that the frog-girl had frozen and was gaping at me, her tongue hanging out of her mouth.

"What?"

"You can run faster than anything Humanity has ever made and you react like its nothing," she said flatly.

"Almight can change the weather with a punch," I deadpanned.

Tsuya raised one finger and opened her mouth, before she lowered it again.

"Withdrawn," she said.

With that out of the way, we headed towards the main hall where we'd be informed as to the particulars of the test after signing in where we were given our student numbers and booklets with more details. The briefing went pretty much as expected, with Present Mic being loud and annoying, Midoriya (who was sat in front of me) fanboying out and Tenya shouting about mistakes and calling Midoriya annoying. All in all, pretty much what I'd been expecting.

Before too long, we were all outside the training ground, a massive faux city that must have cost a kings ransom to build and the school had at least five more. I looked around, absently noting a few people I recognized from the Anime last time through, including the bird headed shadow user, Fumikage Tokoyami, the pink skinned Mina Ashido and Bakugou, who was standing slightly apart from everyone with a dark glower on his face.

"Ribbit."

Oh yeah, and Tsuya was also here.

"Do you really get through that many shoes?" she asked, indicating to my bare feet.

"Not really, but I'm probably gonna have to crank up my Quirk for this and I don't really want to ruin two pairs of shoes in one day," I said as I stretched.

While my speedster boosted body didn't experience lactic acid build up or really any of the negative effects of exercise, it never hurt to be careful and I had pulled a muscle a few times when I went overboard with my Quirk.

"Fair enough," said the frog-girl, "Best of luck in there."

"You too," I said as Present Mic announced the start of the exam.

I ignored my fellow hopefuls as they charged the gates in favor of finishing the last of my stretches. With that done, I bounced on my toes a couple of times, before taking off, blasting past the crowd and into the city, rounding a corner and slicing through a robot in the blink of an eye.

"One," I muttered as the robot fell apart and exploded.

It didn't take me long to rack up an impressive score and before long I had stopped destroying the robots to give the other hopefuls a chance. That didn't stop me from taking out a few to save my fellow hopefuls to help inflate my score with rescue points. I even managed to prevent Bakugou from being bashed over the head by a robot he hadn't noticed, much to his ire if his glare was anything to go by. I just gave a cheeky grin and ran up the side of a nearby building.

As I reached the top, my stomach gave a loud growl and my hair went limp.

"Oh, for gods sake," I muttered as I pulled out my tin of energy tablets to recharge, "This is so annoying."

I flipped the tin open and was about to take one of the tablets when the building shook. I paused, the tablet between my teeth.

"What..?"

CRASH!

The building under me seemed to disintegrate as a truly massive robot shoved its way out of the concrete.

"Oh, so thats where they hid that thing," I said as the roof started to collapse, taking me with it.

I crushed the pill between my teeth, grinning at the feeling of energy once more shooting through me as my hair stood on end. I overclocked my brain and everything seemed to slow down, allowing me to bounce between the falling rocks with ease.

"Alright, this things big, but lets see if it can withstand this," I muttered as I landed on a falling chunk of building and pushed off, "Dean Drive Skyray!"

The air around me rippled as I shot forwards, the sheer force of my jump pulverizing the concrete as a powerful sonic boom shattered what glass remained in the windows, turning me into a living missile that tore through the massive robot with ease and burst out the other side. I hit the ground, carving deep furrows in the asphalt road as I skidded to a stop a good distance from the slowly toppling robot.

"Aw crap," I muttered as I realized I wouldn't be stopping any time soon and spotted the wall that was rapidly approaching.

CRASH!

I slammed into and through the concrete. I lay there for a moment, feeling more than a little dazed and extremely glad for my sturdy body as the most damage I'd received from that impact was a few bruises and a ringing head. I dimly heard a horn go off, marking the end of the match, but remained where I was as I waited for the world to stop spinning.

"Are you OK?" asked Tsuya as she crouched down next to me.

"Yep, I'm fine," I said.

"You do know that thing was worthless, right?" she asked.

"I do," I said, "I just wanted to see if I could take it down."

Su rolled her eyes at my answer.

"Somehow, I knew you were going to say that," she said.

I chuckled and flipped to my feet.

"Come on, lets go," I said.

"Ribbit."

We both headed back towards the main gates, along with everyone else, many of whom kept shooting me odd looks. I ignored them however as I was too busy mentally grinning widely. Considering how many robots I'd destroyed and the number of people I'd helped out throughout the test, there was no way I wouldn't pass. This was gonna be great!

And there we go, done and dusted. Before we go, a few points.

Setsuna's Quirk might seem a bit OP, but at the end of the day, it does work within the rules of the world and just because he can run at eleven times the speed of sound, does not mean that he should. After all, sonic booms have a tendency of blowing out windows and are likely to seriously hurt anyone around him, so he tends to limit his speed. Plus, his clothing can only take so much.

And with that, I'm done. See ya soon and leave a review!