Y/N was walking with the mysterious man through the rain, being covered by an umbrella. They have been walking for a good while to where the mysterious man was taking him. After taking a pathway through an alleyway, the mysterious man had lead Y/N to a bar.

Y/n: Uh....why are we at a bar?

Mysterious Man: Not everything is at it seems young man.

Y/N looked at him curiously wondering what exactly he means by that. When the mysterious man enters the bar, Y/N immediately sees a man made up of a purple mist cleaning a glass and a younger man with a hand on his face sitting at the bar with a milkshake. They both look at Y/N and the young man was the first to speak.

Young Man: Master, why did you bring a child here?

Mysterious Man: Because Tomura, he will be a new addition to our little group.

Shigaraki: He doesn't seem like much.

Y/N: I can say the same thing about you, handy. What's wrong? Your face so ugly you'd have to cover it?

Shigaraki gets up from his seat in anger as he glares at Y/N.

Mysterious Man: Now, Now, let's not cause trouble between us. Allow me to introduce your new allies, The one behind the counter is Kurogiri and this young man is Tomura Shigaraki. I'd like you both to meet our newest addition.

Shigaraki: Welcome to the league I guess. Just be sure to follow my lead and we'll fine.

Y/N: Listen here, hand job. I don't take orders from anyone, let alone some man child who sounds like he hit the smoke a little bit too much.

Shigaraki: (gets irritated)  You little brat...

He jumps at Y/N in anger and reagces his hand at him, but before he could, a small dark portal opened up, making his hand go through and touch one of the stools. As he touches it, the stool starts to turn grey in color and crumble apart, making Y/N's eyes widen a bit.

Y/N: You're quirk.....you can make this decay...?

Shigaraki: Exactly. And whatever your quirk is, it won't stand a chance against me.

Y/n narrows his eyes at him as he brags about his quirk. The mysterious man places a hand on his shoulder, almost comforting him.

Mysterious Man: Our newest addition is in fact Quirkless Tomura.

Shigaraki: (surprised) What? 

Kurogiri: If I may ask, why have you decided that a Quirkless to join us?

Mysterious Man: Because he will be perfect for our future exploits. (to Y/N) Now, if you would be so kind as to follow me.

As he leads Y/N to the back room, Y/N turned back at Shigaraki and gives him a smug smile while flipping him the bird.

Shigaraki: I met for just a minute and I already hate him....so much...

Once he leaded Y/N towards the back room, he opened a small patch and a hidden door opens up, surprising Y/N. Continuing to follow him, Y/N is taken to a hidden space that appears to be some sort of laboratory. 

As he looks around, he sees all sorts of tubes filled with various liquids and floating body parts. They come to a stop when they reach someone in a chair typing away at a computer with a large monitor.

Mysterious Man: Doctor, I have returned.

The doctor in the chair turns around and Y/N immediately recognizes him.

Dr. Kyudai: Ah, All For One, you're back. (sees Y/N) Oh! And I see you've brought a guest.

Almost in an instant, Y/N jumped at the doctor and grabs him by the throat and pushed him against the computer screen.

Dr. Kyudai: (straining) W-What is the meaning of this?!

Y/N: You...I know you...

Dr. Kyudai: (straining) W-What?

Y/N: You diagnosed me and my friend as Quirkless. You said that we will never have a quirk...

Dr. Kyudai: (straining) W-Wait... (recognizes) I remember you now, you and the green haired boy...!

Y/N: Was it true? Are we actually Quirkless? Or was it all lies?! Did you do something to us?!

The doctor tries to answer, but can't seem to do so as he's losing air.

Y/n: ANSWER ME!!!

Dr. Kyudai: (straining) T-True! It's true! You and the boy are truly Quirkless! I-I swear it...!

As Y/n chokes out the doctor in his anger, the mysterious man, now known as All For One just stands where he is with a pleased smile on his face at how ruthless Y/N is.

All For One: Now, Now, let the good doctor breathe. This is still much he can do for us.

Y/N looks at him then back at the doctor and gives him a glare before dropping him and letting him catch his breath. The doctor helps himself up as he catches his breath.

All For One: Apologies doctor, our new friend has some unresolved anger.

Dr. Kyudai: (cough, cough) I can see that. Why have you brought him here?

All for One: Because he will be the one to inherit my vision.

The doctor looks at All for One with shock as Y/n looks at him confused.

Dr. Kyudai: A-Are you sure you want him to inherit your vision?

All For One: I am. Do you not trust me doctor?

Dr. Kyudai: I-It's not that, I assumed that you would've entrusted Shigaraki to inherit it, not some child you met on the street.

Y/N: Fuck you say?!

As Y/N tries to march forward at the doctor, All For One puts his hand up to stop him.

All For One: I have my reason for choosing this young man, just as I have my reasons for Tomura. Now, will put your trust in me doctor?

Dr. Kyudai: I will always have trust in you All for One. If you wish for this one to inherit your dream, then I will do everything I can to help.

All For One: Good, now let's make preparations.

Dr. Kyudai nods and heads off to do whatever it is he's doing.

Y/N: So, your name is All for One? Gotta say, that's not what I expected your name to be.

All For One: While it is not the most ideal name, it is one that many people dare not to cross.

All For One takes a seat in a chair surrounded by medical equipment. He then takes off his fedora, revealing his face to Y/N, and let's just say he was more shocked by how he looked now than his name.

All For One: All for One is my chosen name. It's a pleasure to properly meet you Y/N L/N.

Y/N: (shocked) What the-?!

All For One just chuckled at Y/N's reaction to seeing his true face.

All For One: It's quite a sight, isn't it? It was done by a hero long ago.

Y/N: (surprised) A hero did this to you? 

All For One: Indeed. It has taken a long time for me to properly heal my wounds, even to this day, they have yet to be complete.

Y/n: Wait? You said I was to inherit your vision? What does that even mean?

All For One: You wanted a quirk, correct? To be more than you are? To finally have power and control over your life?

Y/N: I do...

All For One: Well my vision is to have a world where society does not have to confide in heroes or the law enforcement. My vision is to have a world free of constraint. Allowing people to do whatever they want with their abilities. But I can't do that in my current state, which is why you will carry out my vision.

Y/N: But, I won't be able to. Without a quirk, I won't even stand a chance against someone like Wash.

All For One: That is the good doctor is here.

Y/N looks at him with a confused expression on his face.

All For One: You see, Dr. Kyudai has been working for my cause for a very long time. Through the years, he's taken quirks for me and has had them in storage. That is what all these canisters are. Various different quirks from various different people.

Y/N: Whoa... 

All For One: And with his genius, he will be able to grant you what you've sought for so long.

Y/N: I-Is that even possible?

All For One: Anything is possible with another effort my boy.

Y/N: (thoughts) I can't believe it. Me getting Quirk, it's like a dream come true. (clenched his fist) I hope you're ready, Katsuki, Hitomi, because you two are going to pay dearly for bullying and betraying me. 

All for One: Now, the question still stands, will you join me at my side and bring about a new age?

Y/N: Like I said before, I'm in.

All For One: (chuckles) Excellent young Y/N.

Y/N: (realized) What...

All For One: Hm?

Y/N: What about my brother, my sister, and my friend? They're bound to be looking for me.

All For One: There is no need to worry about that, my boy. It will be taken care of.

Just as All For One finishes, Dr. Kyudai walks up to the two with a tablet in his hands.

Dr. Kyudai: I have made the preparations like you asked All For One.

All For One: Ahh, wonderful. Young Y/N, if you would be so kind as to follow the good doctor.

Y/N nods at him and he follows Dr. Kyudai as he leads him towards the deeper part of the laboratory. Dr. Kyudai leads Y/N to an experimentation room.

Y/N: What is this place?

Dr. Kyudai: This....will be the instrument of your rebirth.

Y/N: My rebirth?

Dr. Kyudai: In order for your body to accept what is about to happen, it needs to be prepared. Without proper preparation, your body will fall apart due to the overwhelming stern.

Y/N looks at the doctor then looks at the experimentation room. He's nervous about what's about to happen, but the end result would most certainly be worth it.

Y/N: Well what are we waiting for? Let's get to it doc.

Dr. Kyudai: Excellent.

Dr. Kyudai and Y/N enter the experimentation room as Dr. Kyudai prepares Y/N for the necessary procedure that he must under go for his body to be ready to accept the quirks he is about to receive.

Dr. Kyudai: Are you ready? What you are about to experience, will be more painful than you can ever imagine.

Y/N: I've spent my whole life going through pain, what's little more.

Dr. Kyudai just smiles as he exits the experimentation room as he activates the procedure for Y/N's body. As it starts, Y/N immediately feels pain coursing through his entire body. He screams and flails around as the only feeling is his body is pain. Dr. Kyudai checks Y/N's vitals and much to his surprise he sees that procedure is going better than expected.

Dr. Kyudai: (thoughts) W-What is this? This boy...his body isn't going against the process at all. It welcomes it! What has this child gone through?! Whatever it is, it's made his body stronger! T-This boy, might be the one! Very good, Y/N L/N. This is going better than I envisioned!

Y/N: AAARRRRRAAAHAAHAAAAHHH!!!!!!!!!!!!!!!!!!

(with Arcturus and Wanda) 

Over the coming days, Cynthia and her children could not find any trace of Y/N. It's almost like he disappeared from the face of the earth. This caused Cynthia, Inko, and Wanda to worry about Y/N, they feared the worse about what might happen to him. Izuku felt the same way. Y/N was his best friend and the only other person who could understand him. He feared that he would never find him. 

Arcturus was too. He always stood up for Y/N and helped him despite having a Quirk. Even though they have different mothers, they are still brothers with the same father. 

Hitomi did show some concern and worry about where Y/N was. She felt bad about what she said to Y/N and she wanted to apologize to him.

At the school, news of Y/N's disappearance spread quickly. Some of the students were worried and some of them weren't. One of those said people were Bakugo. He believed that Y/N was only doing this to get attention and it kinda pissed him off. 

Arc, Wanda, Izuku and Hitomi walked into the classroom and Katsuki looked at them, specifically Hitomi who looked away.

Random Male Student 1: Hey man, did you hear about Y/N disappearing?

Katsuki: Yeah? What about it?

Random Male Student 1: Aren't ya at least worried?

Katsuki: Why would I be? He's just doing for attention.

Random Male Student 1: Whatever you say man.

As the rest of the class comes in and takes their seats, their teacher comes in, but he didn't have his normal expression, but instead it was gloomy one.

Teacher: Class, please settle down. I have an announcement to make.

The class gets quiet as they wait for whatever their teacher has to say.

Teacher: I'm sure that you all know about the news of Y/N L/N's disappearance. Well as of this morning, I've received news about him.

Random Male Student 2: Oh yeah? How's that Quirkless loser, teach?

Teacher: As of this morning, Y/N L/N was found dead.

This causes the whole class gasp in shock, especially Katsuki. 

Teacher: Their not sure of the cause of death, but it's come down to blunt force caused by a high attitude.

Random Male Student 3: Wait, are you saying he killed himself?

Random Female Student 4: No way! Y/N wouldn't do that!

Random Male Student 5: Did we really push him that far?

Random Female Student 6: Oh my god, we made someone kill themselves....

As the students were talking about the news they've just gotten, Hitomi silently got up from her seat and exited the classroom. As she did, she covered her mouth as tears were pouring from her eyes. 

Hitomi: (thoughts while crying) Y/N.... I'm so sorry about what I said.... I'm sorry about the video I sent you.... It's all Katsuki's fault..... if he didn't blackmailed me, you would be still alive...! 

(If you're wondering about Katsuki blacked Hitomi into doing it, either find out in the next chapters or give me idea of what would that be) 

Wanda: (crying) No... this can't be true... 

Izuku: (disbelief) Y/N...

Arcturus then suddenly gets up from his seat with his hair covering his face, making everyone look at him. He then begins to make his way over to Katsuki's desk.

Katsuki: What the hell do you wa-!

Arc suddenly lands a punch to Bakugo's face, knocking out of his seat.

Katsuki: (surprised) The fuck, Lightning Prick?! 

Arcturus: (shedding tears) You....it's your fault! You're the reason that Y/N's dead!!

Bakugo was shocked that Izuku hit him, let alone yelled at him.

Arcturus: You bullied him, teased him, picked on him constantly! More than you ever did to Izuku! I don't know what he did to deserve that kind of treatment from you! Sure he was Quirkless, but he was more of a hero than you'll ever be!

Wanda: Arc... 

Arcturus: Y/N's my brother, and you just killed him...

Without saying another word, Arc grabs him school bag and leaves the classroom along with school. The classroom was silent to Arc's anger, especially Izuku and Hitomi. They'd never seen him like that before, it was sorta terrifying. 

Wanda took her bad and quickly followed behind her brother. Katsuki was still on the floor, still shocked at Arc's actions. But Arcturus Farron was the least of Bakugo's worries.

(back to Y/N) 

Groaning awake, Y/N woke up and opened his eyes to find that he was laying in a bed and covered by blanket. He looked down at himself and sees that he's in a black shirt and sweats. 

He looked around and saw that he was in a somewhat sizable bedroom. The door of the room opens and Kurogiri comes in with a tray of food.

Kurogiri: Ah, Young L/N. You're awake.

Y/N: Where am I? What happened?

Kurogiri: The doctor succeeded in the quirk surgery. While you were still in a rested state, I took the liberty of placing those clothes on you and placing you in bed.

Y/N: (surprised) You took care of me?

Kurogiri: Indeed. It is my duty to look after you and Shigaraki.

Y/N: Thanks Kuro, I appreciate it.

Kurogiri gives Y/N a nod as he places the tray of food down and leaves the room. After a couple of minutes, Y/N walks out of the bedroom into the main room.

Shigaraki: Look who's awake. How was your nap sleeping beauty?

Y/N: It would've went better if I had your mom with me.

This causes Shigaraki to glare at Y/N who takes a seat at the bar.

Y/N: Where's All For One?

Shigaraki: The master is away right now. He left something for you in the lab. The doc's down there too. Let's hope that you survive.

Y/N looks at him suspiciously as he marks his way down to the underground lab. As he reaches the lab, he sees that doctor working on the computer.

Y/N: Hey doc.

Dr. Kyudai: (looks at Y/N) Ah! Mr. L/N, you are awake. How do you feel?

Y/n: I don't know. Normal? I don't really feel that much different than before.

Dr. Kyudai: I see. Well, come with me if you would.

Dr. Kyudai takes the lead as Y/N follows him to a room, that kinda looks like a white room.

Y/N: What is this?

Dr. Kyudai: This is where you will conduct your training.

Y/N: My training?

Dr. Kyudai: Indeed. With the quirk surgery being a success, your body must still be able to adopt to your new found power.

Y/N: Okay, so how are we gonna do this? Robots? Drones? Holograms? 

Dr. Kyudai: No, nothing of the sort. You will be training against these.

Dr. Kyudai taps on his tablet and a couple of doors open behind Y/N. As he turns around, Y/N's eyes widen as he jumps back in shock from what he's seeing.

Y/N: What the fuck are those things?!

Dr. Kyudai: This is my latest creation, I'd like to call them, the Nomu.

Y/N: Nomu?

Dr. Kyudai: Indeed. These are artificial humans that have been heavily modified in order to hold multiple quirks. But in order to create them, the person must be deceased.

Y/N: That doesn't really explain why you brought them out.

Dr. Kyudai: Isn't it obvious? You'll be training against them.

Y/N: Are you insane!? They're like 5x times my size!

Dr. Kyudai: As I thought, you're nothing a weakling. I suppose I should let All For One know that you won't be able to achieve his dream.

As the doctor was about to walk away, he felt his body stop as he felt an immense aura causing his body or freeze from fear. He looked back at Y/N, who was giving him a death glare.

Y/N: Call me a weakling again, and I'll make you eat your own heart...

Y/N then just turns around and faces the Nomu in front of him.

Y/N: You have more of these things right?

Dr. Kyudai: Y-Yes...

Y/N: Good. It's best you leave the room, things are gonna get messy.

Dr. Kyudai quickly nods and hurries out of the training room as he heads up to the observation deck. He commands the Nomu to prepare to fight with Y/N. As he does, the doctor thinks to himself.

Dr. Kyudai: (thoughts) This boy...his aura just now, it was almost the same as All For One. Whatever he has suffered must have been immeasurable. There is no doubt, that he will bring terror and destruction to all.

I hope you guys like the first chapter, because more will be revealed soon. Let me know what you guys think at the comments below, peace out and enjoy!