Midoriya: Y/N? Is that you?

You didn't respond to Midoriya and immediately charged at Nomu, you head butted nomu and dazed him as he stumbled back a bit, you then turned your sights on Shigaraki, he charged at you and stuck his hand out towards you in an attempt to disintegrate you but you took his hand and broke it easily.

Shigaraki: GAAAAH!!!

Kurogiru: SHIGARAKI!

You turned back to nomu who was ready to attack you, the hulking beast began to stomp towards you and eventually started running on all fours, you stuck your tongue out with was longer for some reason and attacked, two villains tired to get in your way but you forced your hands out blowing away the villains with Ki Blast cannons before beginning your assault on nomu, the two of you exchanged blows as nomu was slowly beginning overwhelmed.

Y/N: What's happening?! Why can't I stop?!?! Finn are you behind this?!

Finn: Don't ask me! This has never happened with me before...it seems that we've somehow fused...this version of Y/N...It's your body but it's gained so much dark energy that it's gained an evil will of it's own...

Y/N: So I'm like...Possessed by dark energy?!

Finn: Pretty much...

Shigaraki: W-Who are you?!

???: To be honest I don't really have a name, but with all things considered, I think I'll call myself...Dark Y/N...

Midoriya: Dark Y/N...?

Tsuyu: Ribbit...What's gotten into him?

Dark Y/N then looked at Midoriya, Tsuyu and Mineta.

Dark Y/N: You're next!

Mineta: AAAH!!! DOES HE INTEND TO KILL US?!?!

Midoriya: We gotta go!

The three attempted to get away but Dark Y/N teleported in front of them.

Dark Y/N: Not so fast! You three stay here unless you want your lives to end here and now!

Dark Y/N teleported back to nomu and whacked him to the landslide zone,

Shigaraki: This guy is strong! And he's a threat not only to us but the whole world! Kurogiri!
Summon Kamin and Oren!

Kurogiri: Are you sure you want to bring those two here? They're immature and will most likely lose.

Shigaraki: They're our best chance! Summon them NOW!

Kurogiri did as he was told and summoned two entities from two separate portals.

???: It's finally our turn Huh?

???: It would seem so sis.

Shigaraki: Kamin, Oren! Attack the purple guy!

Oren: He's our opponent? He looks strong!

Dark Y/N: I'll take on all Challengers!

The boy of the duo charged Dark Y/N as the two of them began trade blows, he wasn't much on his own but then the girl joined him and they began to attack him together making it quite difficult.

Y/N: If only I could regain control...

Finn: Well try to stop him!

Y/N : What?! How?!

Finn: You managed to keep me at bay with that pure soul of yours, maybe you can do the same with Dark Y/N!

Y/N: It's worth a shot!

Dark Y/N had Kamin and Oren pinned down as he began to crush them with his feet.

Dark Y/N: NOW DIE!!!

Y/N: NOT ON MY WATCH!!!

Dark Y/N's forehead began to glow until a bright blue orb emerged from his forehead.

Midoriya: What's That?!

Dark Y/N: WHAT?! NO!!! NOOOO!!! YOU CAN'T DO THAT!!! YOU'RE SUPPOSED TO OBEY ME!!! STOP!! STOP IIIT!!! STOOOOOOOOOOOP!!!!!!

The orb of blue light engulfed Dark Y/N and blinded everyone, when the light faded you everyone saw Dark Y/N just standing there with his head down. You opened your eyes and saw Kamin and Oren in front of you. Your eyes had turned blue.

Finn: You actually did it!

Midoriya: Y-Y/N...?

You looked at Midoriya and Tsuyu for a moment with a serious face, then you smile and chuckled as you gave them a thumbs up.

Tsuyu: He did it ribbit!

Suddenly an explosion occurred at the entrance, you all looked to see All Might and he wasn't smiling,

Y/N: Take Mr.Aizawa and go...

Midoriya: R-Right!

Midoriya, Tsuyu and Mineta went to grab Aizawa.

Oren: Y-You won't...pull it off!

Oren aimed his hand at the three teenagers and fired a Ki Blast at them, before it could reach them You teleported in front of them and deflected the Ki Blast.

Kamin: Ugh...Oren...Lets do it...

Oren: We...We Don't have choice don't we...?

The two reached for each other's hands while still on the ground, a bright purple light emitted from their hands and blinded everyone, when the light faded you saw one person,

Finn: What the hell...?

Midoriya: They merged?!

???: Since we're Kamin and Oren, you can call us Kamioren!

Y/N: Wow so creative...

Kamioren charged you and reeled their arm back, you reeled your arm back and charged Kamioren as well resulting in a powerful fist clash.

Finn: Looks like this will be a battle of fusions!

Y/N: I still have the form of dark Y/N, but I've gained control, I can tell I've lost some power but hopefully this will be enough!

All Might: Everything is fine now! Because I AM HERE!

Y/N: Lets do this!