Story is currently under rewriting.

Left - Past Text
Left - Future Izuku
Left - Author Speaking

I have to do this, for all the people who have supported me! I've always been looked down on, just because I was quirkless. I was useless, just a punching bag for Kacchan. Or a disappointment to my parents.

I stand in front of the exam doors, and get my sword out.
You'll see, even the quirkless can do things.

"Go! In battle there a no countdowns!"

I grab my sword, and run ahead of everybody.
I cut the legs off the robots, while being very quick about it. I can move incredibly fast, but the way I became this way was not because of some teacher or parent. You see, I was abandoned as a kid and thrown into an alleyway.

Flashback

"You're worthless to me and your mother. You're better off dead, you useless bitch. At least your sister can live up to something." Hitoshi says, glaring at the poor boy.

My 4 year old eyes eyes widen as the car drives off, knowing my fate. I was left in the sketchy part of town, to die.
After that, I see something glowing under the dumpster, so I investigate it. I check under it and see a black sword, with bits of white around it. It's pulsing, like a heartbeat.
I reach for it and grab it, the moment I stood up with the sword in my hands I passed out and woke up in a dreamscape.

"Huh? Where am I?" The little boy asks himself.

A tall guy stands in front of me with a pink/red haired girl next to him.

"Hey kiddo, things have been rough huh?" Izuku hears an unknown voice. "Yeah but.. who are you?" He looks at the two couple of people. One with pink hair and another with brown. "I'm Ikki Kurogane, and this pretty lady here is Stella Vermillion." He replies, scratching the back of his head.
"Wait, where am I?"
"Your mind dummy! See, we are in a different universe." The girl finally speaks. "Right, and we needed someone to pick up this sword. Guess it's you. I'll give you my intelligence and skills on sword fighting." The man now known as 'Ikki' explains. "And I'll give you my fire with my skills too!" Stella continues excitedly.

I start to tear up, knowing I've done nothing to deserve this.
Izuku: I don't deserve this.. I really don't!
Ikki: We see your passion to become a hero, and want you to really be one! Once we're done with you working out, we'll go back to our universe.

After that, I worked out like hell. Thank god for their magic that kept me from starving or dying from dehydration.
Still though, I worked extremely hard. At 4 I was a little tall for a 4 year old. While I grew I was given helpful tips on many things, and he things that made me the happiest were their smiles. Their universe must be really cool!
After about 10 years, I was completely done. Rinse and repeat with the exercises, and lots of lessons. I was happy with my results. Standing at 5'11 and a great body.

Ikki: Look at you, all ripped and grown up!
Izuku: I guess this is goodbye you two, thanks for everything. I would've been long gone by now, but thanks to you guys I've been able to find my purpose and be able to be something! I love you both!
Stella: We love you too Izuku! When you're down, just think of us alright?
Ikki: Mhm! Bye Izuku! I swear you better be the number 1 hero!
Izuku: I promise you!

Flashback End

I activate Itto Shura and start running at an incredible speed, destroying robots with one slash over and over again.
93 points eh? I'm fine with that.
All of a sudden, I feel the ground rumbling. I look back and see a giant 0 pointer. I'm about to run away when I hear a call for help.
All of a sudden my fire activates mixed with Itto Shura, causing an incredible combo attack.

I jump up to the robots head, and slice it's head clean off. I kick the robot doing a backflip, and as I'm about to hit the ground I stab it with my sword, causing a few shockwaves.

Everyone looks at me in awe, including the girl who with the shockwaves was able to be free from the rubble.
I speak out loud.

Izuku: By the way, I'm quirkless.
Everybody: WHAT?!

I help the girl up and smile at her.

Uraraka: There's no way you're quirkless!
Izuku: You see, even the quirkless have value in life.

I pat her on the head as a short old lady heals her.

Izuku: Anyway, see ya.

That day, I never realized it. Of course my sister wanted to be a hero, and I'm not sure why I didn't realize she'd be in the other fake cities taking down a giant robot with one punch.

I say, leaving everybody in shock as to how I'm quirkless.

Timeskip: 1 Day before First Day of School
Place: Abandoned Home

"Wait, am I supposed to get a letter? I don't have an address. Eh, I think I got enough points anyway, first day of school is gonna be a bitch." I say to myself, slowly falling asleep.

Timeskip: 11 Hours Later
Place: Abandoned Home

I wake up as my cheap alarm clock beeps. I look at my spongebob watch and my eyes widen.

"Shit! I'm gonna be late."

I cleaned the abandoned house, making it look like a real home. Just a bit ripped in some places.
I was able to get a few jobs, such as babysitting or mowing lawns which were able to get me some things, such as a toothbrush, shampoo, all that stuff.

I open my door and run to where the UA building is, it's not hard to miss a massive building on a hill.
.
.
I arrive there, knowing that I'm about 3 minutes late. I'm walking around seeing a bunch of doors.

1C, 1B, and 1A?

Hm, I'll check 1A first.

I open the giant door and see a guy in a sleeping bag with a uniform, probably for gym.

Aizawa: Who might you be?

A green haired girl with black highlights eye's widened.
Izuku: Not sure if this is my class, but Izuku Midoriya.

I look around the class and spot him.. and her. The biggest asshole alive, and the meanest sister alive. I can't wait to beat Kacchan's ass, and I can't wait to hear what my parents have to say!
All of a sudden, he speaks up.

Bakugo: DEKU?! HOW THE FUCK DID THE QUIRKLESS FAILURE WHO'S BEEN GONE FOR 10 YEARS END UP HERE?!
Izuku: AND HOW THE FUCK DO YOU EXPECT TO BE A HERO IF YOU CANT ACKNOWLEDGE THE PEOPLE BELOW YOU OR EVEN THINK ANYONE'S BETTER THEN YOU?! OR ARE YOU JUST THAT MUCH OF A FUCKING BITCH?!
Aizawa: Stop it, that's enough.

3rd Person POV
"Hey Midoriya, that's you as a boy! Are you twins?" Mina asks her, confused. "I-it's a long story. But why and how is he here?!" She stands up and looks at her twin arguing with the teacher. "Mr. Aizawa, can I speak to Izuku?" She asks and he nods. Izuku's scoffs and walks outside. He looks at his mirror image, just longer hair and a massive difference in bodies. "I-izuku.. how'd yo-" She gets cut off by him speaking. "How I lived? It's a secret." He says nonchalantly. "Please Izuku.. tell me.. look. I need to tell you the truth." She replies, in a desperate tone. Izuku shoots her a confused glance and gives her a hand signal to walk with him. "Spill. What you say will effect on how I treat you." He said. "My p-parents.. they told m-me if I t-treated you like a h-human that I-i'd be killed.." She says while she starts to tear up. Izuku stops walking and pats her on the head. "That's what I was hoping. I forgive you." He replies happily.
Izumi's eye's widen as a blush spreads on her face. "O-o-oh, thanks I-i-izuku.." She said nervously. 'Yeah, I have to admit it. I'm in love with my brother.. and I only just met him.'

Izuku's POV
We walk back into class in comfortable silence. Well, when I open the door it's interrupted by Kacchan standing rushing at me with an explosion charging up. Immediately I move in front of Izumi to shield her. The smoke clears and I'm shown standing there, panting. A colorful aura surrounds me as I stand there in front of him. Aizawa, being the asshole he is stops me instead of Kacchan. I hear my sister scream to stop but I get flung outside.

He throws me out the door, I land onto a wall and my back makes a painful sound.
I fall to the ground, in lots of pain.
The people from other classes look out their doors and see me right in front of a crater in the wall.

Aizawa slams the door shut, startling the others.

"Goddamn it, it hurts." I grunt in pain as I check to see if anything is broken.
I stand up with an empty face and walk up to the 1-B class.

"Hey guys, not sure what class I'm supposed to be in. Can I speak to your teacher, who'll hopefully not throw me into a wall?" I say, slightly smiling.

A orange haired girl walks up to me.

Itsuka: Sure, he's inside.
Izuku: Thanks, I hope I didn't interrupt anything.
Itsuka: Oh, it was nothing important. Go do your thing.

I smile at her and walk by the other classmates. I walk up to the teacher, and he doesn't look like a bitch at least.

Izuku: Hey uh, is there a student named 'Izuku Midoriya' in your class?
Vlad: I don't see you on my list, and from what I've seen 1-A probably doesn't like you.
Izuku: Yeah, I got a good amount of points in the entrance exam and saved someone. So can I stay here? That other guy is a pain in the ass.
Vlad: You can stay here for now, I'll go tell the principal tomorrow.
Izuku: Okay, thanks.

The other students refill the room and I sit on the ground in the back, behind the orange haired girl.

He starts talking about something like introductions and tests, but I fall asleep.

Itsuka's POV
After class ended all the students left except Setsuna. I see the green haired boy on the ground sleeping.
He's pretty cute when he sleeps, no doubt about that!

Setsuna walks up to the asleep boy, a little red. She taps him on the shoulder and his eyes open slowly.

Setsuna: Look who's awake!
Izuku: Did I miss anything?

I stand up from my chair and kneel down.

Itsuka: Nope, but tomorrow we'll doing all those physical tests since 1-A did them today.
Izuku: I swear, I walked in and all of a sudden I got screamed at by a bully, answered back, then got slammed into a wall. Not the best day today, but thanks for keeping me company.
Setsuna: Aw, no problem! Jeez, you're also super nice!
Izuku: Well, I enjoy being nice because I like seeing people's smiles. It's a sign that they enjoy my presence, and it makes me happy. Back when I was a kid, I never smiled.

I smile as I look at him, Setsuna doing the same.

Itsuka: That's so sweet! But why couldn't you smile back then?

He looked down, a shadow over his eyes.

Izuku: I was.. left behind to die. When I met these 2 people, they taught me all about companionship and basically everything to know. When they smiled it felt like I could do anything.
Itsuka: Who left you. Who left you behind?! Why would anybody be so cruel?!

I start crying into his chest.

Setsuna: That's just wrong.. who'd ever leave a child behind?! To die even?!

She starts tearing up a little too.

Izuku: Hey, please don't cry you 2! It doesn't matter about the past! I'm way better now, and trust me one day I'll make him pay.

I smile at him with a few tears in my eyes, he wipes them and smiles at me.

He wipes Setsuna's tears too, still smiling.

Izuku: There we go! All better now.

He stands up as we do the same.

Izuku: Wanna walk home now?
Itsuka and Setsuna: Yep!

Izuku's POV
We walk out the building and I spot a few of the students I saw earlier today, In 1-A.
I walk past them, a tall blue haired guy and a browned haired girl who I didn't recognize until now.

I walk past them not even looking back, but of course that fails.

Iida: Hey you there. Why did you enter our class earlier this morning, and disrespect our teacher? Plus, I need you to explain your twin problem.

He walks up to me and picks me up by my collar.

Itsuka and Setsuna: Izuku!

Izuku: Look, I didn't get the letter now would you put me down you asshole?
Iida: What did you just call me?
Izuku: I didn't call you that, it's just what you ar-

He puts me down and punches me in the face.

Uraraka: Hey Iida that's to far!

I fall to the ground, close to losing consciousness.

Both of the girls are trying to get me up, and I see the girl I saved holding back the guy that punched me.

I regain my senses kinda quickly and stand up, reassuring the girls by putting a finger up to my lips. I look at the brunette.

Izuku: Hey, do you remember me?
I look at the brown haired girl who just looks down and walks away.

I sigh as I look down.

Izuku: Cmon you 2, let's go home.
Itsuka: Why is life so unfair to you?! There was no point in him even hitting you!

She starts crying again as I pat her head a few times.

Setsuna just glares at the guy and he worriedly catches up to the girl.
I hear a voice behind me, of course it's my sister. She hugs me arm and pouts as she sees the two others. "Wahh! It's your girl version!" Itsuka shouts, confused. I chuckle as I pat her on the head. "Nope, my twin." I reply happily. "Cmon Big Brother! Where do you live??" She asks excitedly. Who knew she had that much affection.