Izuku fell from the silver liquid coughing.
The villains around him doing the same.
"Welcome back my child."
Green eyes filled with fear looked and saw the masked face of his father.
His hands were spread wide as if expecting a hug.
"I've missed you Mikumo."
It seemed as though he would speak more but his head turned as if he saw something from the corner of his nonexistent eyes.
"You're here, after all, aren't you."
From the smoke that covered the sky a figure rocketed towards them.
With his massive fists pulled back and blond hair rippling in the wind All Might roared at the villain as he caught the two punches the hero had tried to hit him with.
"I'll have you return everything, All For One!"
"Will you kill me again, All Might?"
The ground around the two power houses was torn away by the sheer force of their power.
Sending Izuku and the villains away.
In the clearing smoke of their small clash All For One shook his right hand and spoke to the blond hero.
"Your pretty late. It's little more than five kilometers from the bar to here. It was easily thirty seconds after I sent the noumu before you arrived. You're getting weaker, All Might."
The hero was one the ground resting his aching fists from the clash.
"What about you? What's with that industrial mask you've got on? Aren't you over exerting yourself?"
Izuku looked on as predecessors of both of his main quirks spoke.
All Might began hopping on one leg readying himself for the mighty clash that was coming.
"I won't make the same mistake as I did six years ago, All For One! I will take Young Midoriya back and I will throw you in prison for sure! And all of the league of villains you control!"
The blond hero rocketed forward a massive fist pulled back.
All For One's arm bulged and black lightning appeared around his arm.
"Midoriya is that what my son has begun calling himself? How sad."
Before All Might could land his attack he was knocked back by a massive blast of air.
Sending the hero like a massive bullet straight through multiple tall buildings.
"Air cannon plus springlike limbs, kinetic booster times four, strength enhancer times three."
The mask villain spoke holding his open hand in front of his masked face.
"This combination is fun. Maybe I'll try to add a few more enhancer types."
Izuku finally managed to get up once the smoke caused by his father's attack cleared.
And saw the leveled buildings caused by it.
"All Might!"
"Mikumo your concern is misplaced that wouldn't kill him but I don't understand why you would care for trash like him."
All For One turned his head to the blue haired man child.
"Tomura run from this place and take Mikumo and Shinichi with you."
His father's fingers morphed into long black tendrils with red veins. They raced forward and pierced the unconscious Kurogiri's chest forcing his quirk to activate and create a portal.
"Kurogiri take everyone away from here."
The villain in casual clothes raced to his father.
"Hey, Wait! He was defeated and is unconscious! I'm not sure what's going on but if you can warp people, then you should get us away."
"I just got mine Magne and it only works short distances. On top of that I can only send people away or bring them to me and I can only send them to a person I am very familiar with. So I'll have Kurogiri take you."
"Forcible quirk activation!"
"Now, go!"
"What about you Sensei?"
Smoke poured from a far away building a white streak of air showed as All Might rocketed from a collapsed building. Sending himself at the symbol of evil.
All For One rose into the air activating another quirk.
"Think constantly Tomura. You still have much more room to grow!"
All Might pulled back his fist and roared.
"I won't let you get away!"
The symbol of evil caught his attack once more. Winds spun around the two as their fists collided.
The villains encircled Izuku preparing to capture him.
All Might seeing this tried to rescue him.
"Young Midoryia!"
Only to be blocked by black tendrils.
"All Might focus on my Father. I can defend myself."
The villains attack him.
A blade like ruler cut his cheek and the crazy blond ran at him attempting to stab him with her knife.
With their nigh constant attacks Izuku couldn't focus to use one of his quirks.
He caught sight of Compress from the corner of his eye.
And dodged the stretched hand of the villain.
'I cannot allow him to touch me.'
The villains circled him once more and attempted to attack him in mass.
But they were blocked by a wall of ice that encircled the greenette.
'Todoroki?'
No matter who it was that created the ice they gave Izuku an opening.
And he took it.
He activated Wings, Muscle Augmentation, and One For All at once.
Wings erupted from his back and muscle fibers broke out from them giving the limbs new strength and green lightning crackled around Izuku's entire form.
Streching the limbs Izuku smirked and used them to send himself flying from the ground. The winds created from the first flap of his wings shattering the ice.
He saw the former user of his uncle's quirk fighting his father.
'Is he... holding back?'
Izuku shouter out to the hero below him.
"All Might don't hold back!"
The hero turned his head and saw his successor in the sky out of the way.
Clenching his fists feeling the embers of One For All dying.
Yellow lightning crackled around All Might as he for once went all out.
Rest of the fight is basically like the show and I don't have the patience to type it all out.
His father taunted All Might after he exposed the hero's weakened state by telling him two things.
One that Tomura Shigaraki was Tenko Shimura. Nana Shimura's grandson.
And two that he had created two children from the former wielder of One For All in her current Vegetative state.
Izuku and Shinichi.
"Mikumo and Shinichi aren't just regular children. They were not born as normal children are."
The villain spread his arms.
"They are more like clones of myself and my dear little brother."
His scar tissue covered face looked at All Might.
"Besides what could break the successors of my brother's quirk than having to fight his clone?"
All Might grit his teeth and channeled the last embers of One For All into his right arm.
Making it grow to a the size of his muscle form.
Yellow lightning crackled around the limb.
His father prepared to use that powerful combination on the distorted hero.
But he instead used to block an attack from Endeavour.
Who shouted at the number one encouraging him in his own douchbag way.
Edgeshot and Kamui woods were with him grabbing the heroes trapped beneath the rubble.
Tiger as well encouraged the hero while holding onto his now quirkless comrade.
Endeavour and Edgeshot kept his opposite busy while the symbol of peace gathered his strength.
Izuku shouted down at his predecessor.
"All Might defeat him! Defeat my bastard of a father!"
His father spoke.
"How annoying."
And fired down a powerful blast from the combo of quirks sending the heroes flying.
Only All Might still stood.
"Let's stop talking about emotions and start talking about reality."
His arm began changing as he activated a multitude of quirks.
"Springlike limbs, kinetic booster times four, strength enhancer times three, multiplier, hypertrophy, rivets, Air walk, and spearlike bones."
The result was a misshapen mass of flesh that could barely be called an arm that was larger than his body.
"The shockwaves until now were to wear you out, not kill you. In order to kill you for sure, I will punch you with the ultimate combination of quirks that I have right now!"
All For One charged at the hero pulling back his misshapen arm.
"My son that is who you gave my brother's quirk too!"
All Might met his punch with one of his own fueled with the last few embers of One For All still burning within him.
Everything around was destroyed in a massive shockwave created by the sheer power of their combined blow.
"Impact nullification!"
Activating another quirk the villain made All Might's attack pointless as blood shot from his arm.
The villain pushed the hero back. The force of his strike sending them many feet back.
All Might stomped his foot down stopping their movement and making a impact in the ground as All For One continued his massive punch.
He channeled the last of One For All from his right to his left. Letting his now shrunken arm take All For One's attack and hitting the symbol of evil in his scarred face.
"Little tricks like that aren't like you. Someone has been influencing you!"
All For One's left arm ballooned out as he activated another quirk.
"It's weak!"
The last embers of One For All left All Might's left arm and filled his broken right.
"That's because my back wasn't in it!"
Blood poured from All Might's mouth as he used his final attack.
"Farewell, All For One."
"UNITED STATES OF SMASH!"
His attack hit the villain's face slamming him into the concrete.
The attack created a tornado with it's massive power nearly pulling Izuku from the sky.
Izuku landed in the destroyed city.
Walking carefully in the rubble he approached his father.
He kneeled and pulled the scarred head into his lap.
Purple and green lightning swirled around Izuku and stabbed into his father.
"Every quirk you have is mine."
Within Izuku the black and white voids were no more.
In their place was a grey void.
The quirks All For One and One For All were no more.
In their place was the new quirk.
One For All And All For One.