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The 9th users of One for All

Summary:

Basically a what if everyone got One for All? What would One for All do to them? Starting off with Class 1A.
Sum up: Short stories of Class 1A with One for All in their respective universe. I will give a little quirk explanation, then the story after!

Notes:

(See the end of the work for notes.)

Chapter 1: Format to how I’m going to work this through(oh gosh)

Chapter Text

Hello! So um I’m hoping to start this all soon, I just have to work on some personal things and edit what I got. I have an idea for how I’m going to post(not when). Basically it’ll be something like this. 1.Story 2.Quirk Explanation 3.Requests. I’ll explain each. The story one is obvious. The quirk explanations are what I think One for All would do to certain quirks where I can’t make a story to show how they would get One for All, some of these I can do requests for oc quirks, or anyone(if I have enough info). I will only look at request comments on this chapter. Requests will be stories that are requested. If I can’t make a story I’ll do it in the Quirk Explanation. I hope you have a good day! The Izuku chapter should hopefully be up sometime in the near future. Oh one more thing. I’m going to start with about half of 1-A, then three staff from UA, then three pros. After that I’ll do mainly requests and other characters I can think of. Depending how this goes I might do a voting chapter where y’all get to choose who’s next, or I’ll ask on discord. Update: In the quirk explanations I will only use the quirk Blackwhip. In the future I will make a chapter to explain what the other quirks would do. I will put a warning in the chapter name, so people know. Also, I have updated each chapter and added something new to each.

Chapter 2: Izuku Midoriya

Summary:

Here’s the first chapter! We got Izuku Midoriya.

Notes:

(See the end of the chapter for notes.)

Chapter Text

‘Why did I have to get paired up against Kacchan?’ is Izuku’s only thought as he tries to get away from the exploding boy.

‘Ok calm down and think, I have to find somewhere to hide so I can contact Uraraka’. As he’s running through the corridors he sees a door. ‘Perfect! I'll hide here, so I can check up on her now.’ As he closes the door he can faintly hear explosions.
--Up in the viewing room--
“Why’s Midoriya hiding sir? That's not very manly.” Kirishima spoke up as Midoriya hid in the room behind the door. “Young Kirishima, my best guess here is that he is trying to contact Young Uraraka. He can’t do that and fight Young Bakugou at the same time.” All Might instantly answers. “Oh”, Is the only response.
--Back with Midoriya--
“Ok, don't stop looking, we need to find that bomb and fast. I’m still going to hold off Kacchan. Contact me if you find where the bomb is and I’ll do my best to hurry and get to you.”

Izuku had to stop, because his throat felt hot, and was having a little bit of a hard time breathing. “Deku? Are you ok? You sound out of breath.” Uraraka’s worried voice came through. “Yeah I’m good, don't worry.” Izuku answered quickly, not wanting to worry Uraraka. “Ok, if you say so. I’ll continue to look and report anything I find! Uravity over and out!”

‘Ok now to distract Kacchan. Where is h-’ His thoughts were cut off as an explosion blew the door off its hinges. Izuku shouts in surprise as the door lands near him. “There you are, nerd! I finally found you! Now I can beat you into the ground!”

Izuku has to roll to dodge the explosion that landed where he was moments ago. ‘He’s not holding back!’ “If you just stay there and take it, I might just make it quick!” Bakugou shouts.

The burning feeling starts back up again in Izuku’s throat. He clutches his throat. ‘Ah it's really starting to burn. Why?’ Izuku yet again has to dodge another explosion. “Stop dodging, nerd!” Izuku runs past Bakugou as he makes another explosion. “Get back here, nerd!”

Izuku keeps running, one hand on his burning throat. ‘I have to end this quickly. I don't know how long I’ll hold out against him. My throat isn't helping, I can barely breathe!’

Izuku ends up in a room with no exit, pillars on the sides. ‘Crap, there's no exit!’ “I finally caught up to you nerd!” A shout from behind him. ‘Crap! He’s Already here!?’

“You know so much about my quirk don't you? Then you should know I can't make too big of explosions without strain?” Bakugou explains. “I got these gauntlets to do just that, but without the strain. I'm very excited to see how they work! How about you be my testing dummy?”

“Young Bakugou don't fire that thing. You could severely hurt Young Midoriya!” All Might calls from Bakugou’s earpiece. “He’ll be just fine if he dodges!” Bakugou pulls the pin, and Izuku barely moves out of the way, his left side being hit by the blast. “AHHHHH” Midoriya screams in pain.

Through the pain he sees Bakugou ready his other gauntlet. Izuku thinks of a plan. ‘If I punch at the next explosion, I might be able to disrupt it with the wind pressure I produce.’ As he activates One for All the burning in his throat gets worse. As he grabs onto his throat he thinks, ‘Why is it hurting so bad?’

He thinks he sees green flames? Little sparks coming from somewhere? ‘What?’ He looks to Bakugou, who has a look of confusion for a split second, that's hardened by a scowl right away. Bakugou is about to fully pin the pin when Midoriya shouts, “Wait Kaccha-” As his whole world turns to green.

--Up in the viewing room--

“Young Bakugou don't fire that thing. You could severely hurt Young Midoriya!” All Might shouts, startling a few students. They all look on in horror as Bakugou pulls the pin. An explosion shooting out, and engulfing Midoriya.

As the explosion dies away, they see Midoriya with burns on his right side. Some sigh in relief, and others gasp in surprise. As Midoriya stands up, by his mouth All Might thinks he sees little green sparks of fire? ‘What? Is that a quirk?’

All Might sees the red veins around Midoriya, signifying One for All being activated. All Might starts to panic again as he looks to Bakugou and sees him about to pull the pin. Looking instantly back to Midoriya, about to call in Bakugou to stop him from pulling the pin again, he sees Midoriya’s mouth open, and green flames come out.

The cameras went off. “YOUNG MIDORIYA!”

--Back with Midoriya---

As darkness overwhelms him, he sees a misty portal? In the portal a hand reaches for him. As the hand makes contact, he succumbs to the darkness.

Notes:

Here’s the summary. Everything is canon up until the start of this. When Izuku got One for All it reacted differently. It attached to his recessive quirk genes. Izuku is able to use One for All to combine Fire Breath and Inko’s quirk. When he does this, it’s a random combination of the two quirks, he could even get a mutation. If you can think of a combo for those two quirks, there’s a possibility that he could use it. Once he’s done using the quirk it will fade away. If he were to activate it again it would be another random combo. There is a possibility of getting the same quirk more than once, but it’s very low. Thank you for reading! Have a good day!

Chapter 3: Eijiro Kirishima

Summary:

Kirishima with One for All up against Muscular

Notes:

I know I’m posting another story I know. I’m work on the quirk explanation for Hagakure. Hopefully I’ll have it up within the next few days.

(See the end of the chapter for more notes.)

Chapter Text

“I know where Kouta is!” Midoriya screams at Mandalay. “I’m bringing Kirishima with me in case!” Midoriya grabs Kirishima’s arm at the nod of Mandalay. “Lets go Ei.” Midoriya tells Kirishima, as they rush into the bushes.

Kirishima follows Midoriya for a few minutes, when they get to a cliffside. Above they hear a voice. As they near the top, they see the villain Muscular. ‘That's the villain that killed Crimson Riot!’ Kirishima remembers hearing it on the news when he was 12. He sees Muscular about to bring a fist down on Kouta.

“Fine if you won’t give me the hat, then I’ll just take it off your body!” Muscular says to Kouta, unaware of the hero students to his back. “NOO!” Kirishima yells, hardening while charging in to take the blow, punching the back of his knee while passing. Knocking Muscular off course some, but still skimming Kirishima’s side. Muscular falls on his hit knee.

“You pack quite a punch, huh kid!? I can’t wait to kill you!” Muscular screams at Kirishima as he readies another punch. Kirishima turns, grabs Kouta and moves out of the way using One for All. The punch behind him shatters the ground below, sending shards of dirt and stone at his back.

Kirishima lands near Midoriya, having stayed back not being able to help too much at the time, and hands Kouta to him. “Get out of here now! I’ll do my best to hold him off while you get Sensei or someone else.” Kirishima orders Midoriya. “I can’t. He’ll kill you!” Midoriya screams back.

Midoriya’s eyes widen as he screams, “Watch out!”. Kirishima is sent flying to the side, as Muscular collides with him. “EI!” Midoriya yells, as he sees Kirishima get stuck deep into the mountain side. Muscular jumps after Kirishima again, jumping into the hole he made with Kirishima.

From below there is a scream, then a yell of, “GET THE HELL OFF OF ME!” As Muscular is sent from the hole to the ground above. As Muscular gets up, he thinks, ‘I’m going to kill the green haired kid, and the child before he gets back.’, and charges Midoryia, who is still holding a crying Kouta.

“Show me your blood!” Muscular screams, as a black tendril grabs Midoriya’s waist and pulls him to the side, as the giant muscle behemoth flys by. ‘What?’ All Midoriya can think of, as he is pulled into an embrace by strong, rock-like arms.

“Ei?” Midoriya asks, confused. “Yes.” Is the only answer he gets as he is moved to the side, “Get Kouta out of here, and get back up now.” Comes Kirishima’s voice, anger laced around the edges.

The last Midoriya sees of Kirishima is black tendrils coming out of his back and wrists, turning into black stone, as he books it down the cliff.

“Oh did your little friend leave?” Muscular taunts Kirishima, finally pulling his fist out of the wall he had collided with. “I can tell you’re getting serious, well I guess I should too!” He shouts as Muscles surround his body.

Muscular doesn't even move as Kirishima is up in his face, pushing Muscular back a few feet. “Really is that all you got! It's my turn now!” Muscular moves forward to get Kirishima in the stomach, but is stopped by a black stone-like tendril.

Said tendril wraps around Muscular’s midsection, holding him in place. “You aren’t going to hurt me or my Green Bean.” Kirishima starts, then yells, “SO SHUT UP AND STAY DOWN!”

At this Kirishima pulls back a fist, black and red electricity running around his midsection and right arm. His arm hardens to an extreme amount. All that is heard is, “One for All, Unbreakable, FINAL SMASH!”

Muscular trying to move out of the way, but can’t due to the tendril holding him in place. The fist hits him square in the face, tendril slipping away, and gets sent deep, deep into the mountain side.

"Heh, I did it". He states tiredly. He stumbles backwards, almost falling, before he does, he rights himself. he stands straight, as black dots swarm his vision.

He stumbles again. As he is falling, he sees a misty portal open in front of him. A hand reaches towards him. As the hand makes contact with him, he passes out.

Notes:

Ok there’s a bit to explain here. So yes this is KiriDeku, I wanted to so sue me. This is also based off a headcanon of mine. If Kirishima is enraged in battle, he’ll act a bit like Bakugou. Thank you for reading! Leave any comments down below to tell me where I could have done better! Have a good day!

Chapter 4: Quirk Explanation: Hagakure Tooru

Summary:

Hagakure’s quirk with One for All explained.

Notes:

Hagakure’s quirk with One for All explained. This is my first quirk explanation.

Chapter Text

For Tooru I think that One for All would be interesting, especially with the past user’s quirks. I feel like One for All would allow her to do different things with her invisibility. Like make the quirks themselves invisible. So BlackWhip would be invisible, and only she would be able to see it.

Like making something/someone else invisible with her. This would be helpful with stealth missions, especially with Aizawa. A few good team ups would be Aizawa, Shoji, Uraraka, Kaminari, and a few others(can't think of any more off the top of my head).

She would be able to make herself visible. I feel like she would be able to see past other invisible type quirks. Like a cloaking quirk.
I feel like she would get a small strength boost, and a semi big speed boost. I don’t think she would explode if she used the power. The amount of strength she would have would be peak human strength.

---------------------

As she walks out of the gates of UA, shouting her goodbyes to Mina and Jirou, she starts to get dizzy.

"Woah", she says as she nearly falls. In front of her she sees a misty portal open. A hand reaches out. As the hand makes contact with her, she hears Mina and Jirou shouting distantly, before she is pulled in.

Chapter 5: Quirk Explanation: Mezo Shoji

Summary:

Shoji’s quirk with One for All.

Notes:

(See the end of the chapter for notes.)

Chapter Text

Because of how big he is I feel like he would be able to use the full power of One for All instantly. I feel like One for All with mutations wouldn’t do much.

To put it in basics. Faster limb creation, about 10 limbs per second, if he pushes about double at 20 limbs per second.

He would be able to detach these limbs. The limbs could be given to amputees. He could also make organs, but they would need to be saved instantly. There’s not much other things that I think One for All would do for Shoji.

Going into the past user’s quirks. He would be able to send BlackWhip through stubs on the areas where he makes extra limbs.

——————————————

As he is walking towards the dorms, having just finished training his new ability from One for All, BlackWhip, he starts to feel dizzy.

He lets out a huff of breath as he nearly faceplants, his arms holding him up. He hears a whooshing sound and looks up to see a misty portal. A hand reaches for him, and is pulled into the portal onto hard ground.

He looks around, not able to see his surroundings very well. As he tries harder, he notices he's not the only one here. 'What are Midoriya, Kirishima, and Hagakure doing here?' it's the only thing he can think of as he passes out.

Notes:

I made a discord server for my fics! Join if you wanted to be updated on what’s happening, and to vote in what I’ll do next!
https://discord.gg/ptCCqd8Y

Notes:

Comment any suggestions about how to improve, or what I did wrong. Also comment down below who you want to see get One for All. Starting off with Class 1A. This is my first fic on AO3.