Y/N L/N is an independent boy who grew up with nearly no friends, his only friend being Izuku Midoriya, one day he managed to obtain a demonic power that is insanely powerful if used right.
Kamioren charged you at full speed and swung at you, you crossed you arms and blocked the attack before kicking them away making them slide back a little.
Kamioren: Ha! Not as much impact as before!
Y/N: Well there's more where that came from!
You leaped towards Kamioren and delivered a strong punch to their face making them spit up a little saliva, you then kicked them in the gut and uppercut their chin making them go flying, you followed after them until they spun around and kicked you in the face sending you back to the ground making a hole in the ground filled with debris that you were buried under.
Midoriya: L/N!!
Finn: Cmon Y/N, You can take something like this...
Y/N: *Sigh*
A purple light began to shine under all of the debris, a beam of purple light shot straight up and destroyed all the debris, you jumped out of the hole and stared Kamioren down.
Kamioren: Hah! That all you got? You're pretty weak!
Y/N: Grr I'LL SHOW YOU WEAK!!!
You began to emit a dark red aura that was slowly getting bigger, you began to scream making the whole USJ shake.
Momo: What's going on?!
Jirou: I don't know! But I get the feeling that it's L/N's doing!
Kaminari: Yaaaaaay......!
Your eyes went from blue to red but you still had control, you stared Kamioren down who still had a cocky look on their face, you opened your mouth and screamed revealing your sharp teeth before charging at them at full speed.
Meanwhile, All Might was running down the stairs as some of the villains were trying to attack him, All Might easily took care of them by hitting them with a powerful Detroit smash.
Shigaraki: Nomu! Get All Might!
Nomu let out a loud screech and charged at All Might whole cocking it's arm back, All Might did the same and charged Nomu, the two began to fight as they exchanged blows to one another.
Kamioren: Come at me weakling!!
Kamioren swung at you but you disappeared and reappeared behind them before whacking them in the back of their head, you then went in front of them and rapidly punched their stomach before uppercutting them in the chin twice and finishing the assault with a kick that blew them away
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Kamioren crashed into the mountain zone and panted for air while wiping blood off of their mouth, the looked at you angrily.
Kamioren: This guy had this much fight left in him...?!
Before they could think they saw you flying right at them at full speed as you reeled your fist back, you swung at them but Kamioren barely managed to dodge at the very last second and you punched the mountain instead spitting it in half.
Jirou: So much power!!!
You looked back at Kamioren with your eyes glowing red making you look insanely intimidating, You flew right back at them and reeled your arm back once more, you punched them right in the face making them spit up saliva,
Suddenly you began to glow purple and you and Finn separated from each other. Finn was still connected to you.
Y/N: Oh no!!!
Kamioren: Yes! Now's my chance!!
Kamioren grabbed you both by the neck and flew straight down planting you both into the ground.
Momo: Y/N!! Finn!!
Kamioren then took the two of you and threw you back to the central plaza, the two of you could only gag for air as you landed onto the ground. You both laid there and stared at the ceiling.
Y/N: *Pant* Finn...*Pant* what now...?
Finn: We *Pant*...Need to work together...to take him down...
Y/N: Lets do this!
Kamioren was walking towards the two of you when suddenly you both sprung up staring him down with a look full of anger.
Kamioren: Ready for more?
Finn: You're going down!!!
The two of you charged at Kamioren and began to swing at them, the three of you began to exchange blows to one another as you all shouted
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Meanwhile All Might and Nomu were still exchanging blows but at a much faster pace then before, All Might punches Nomu into a bunch of trees, Nomu then came running back on all fours and leaped at All Might and the two went airborne.
All Might: A hero, Will Always find a way for justice to be served!!!
All Might Threw Nomu to the ground making a bunch of cracks in the ground that soon formed a crater, All Might came crashing down and landed on his feet.
All Might: You may have heard these words before, But I'll tell you what they really mean!! Go Beyond...PLUS...
All Might punched Nomu in the gut while screaming at the top of his lungs
All Might: ULTRAAAAAAAAAAA!!!!!!!
A huge explosion followed the punch and sent Nomu far out of the Facility, meanwhile you and Finn were slowing overwhelming Kamioren, You both landed a united punch to the gut that connected perfectly making them spit up some saliva, the two of you kicked them into the air and charged up a united blast
Y/N: TWIN...
Finn: CANNON...
Both: FIRRRREEEE!!!!!!
A massive Ki wave blasted from your hands and engulfed Kamioren who was now struggling to keep their composure.
Kamioren: GAAAAAGH!!!!!!
Kamioren split back into Kanin and Oren and the two gasped for air, they were then vaporized to nothing. The two of you stood tall in triumph.
Y/N: We...We did it...
Finn: Just shut up and be happy I helped you...
Finn passed out and retracted back into your body before you passed out as well.
