1 Month Later

Izuku: So, there's a bit of a problem.

AFO: That's a bit of an understatement.

Izuku: My sister has practically gone crazy. She's going left and right killing villains mercilessly. She's looking for those responsible for killing her friends, and she already killed the HPSC President and her entire community. The whole country's fearing her.

AFO: But...

AFO: She's calling for you.

Izuku: And she won't stop till I'm dead.

Toshinori 2: YOUNG IZUKU! I HAVE ARRIVED WITH THE OTHERS!

Izuku 2: If it requires us...then we will stop this monster!

Katsuki 2: WHERE IS YOUR TWIN?!

Shoto 2: Calm down. This is someone with All Might's quirk. Stronger, faster, and this time more enraged.

More and more people arrived, taking shelter from the chaos being induced by a psychotic Izumi as AFO makes more and more calls.

Garaki: I've prepared ten thousand Nomu for the rampaging one for all user. To think heroes and villains would unite just for this...

Breaking News! Green Telek has been killed! Endeavor has been killed! Stars and Stripes has been killed! Entirety of Class 1A has been killed!
Toshinori 2: We were designing a suit young Izuku! It was just a prototype but...in honor of those in Class1A and those who lost their lives...this is just for you!

Izuku was given a suitcase that activated as it opens up.
Toshinori 2: I understand what you gone through. What Izumi is like. You have the right to fight your sister, and end this revenge of yours.

Izuku: Hero vs Villain...it's always the same.

BAM*

AFO: I've put some effort into this suit too, ensuring it's material is thousands, millions of times tougher than what it was before. You can use each function multiple times too.

Tomura: You've been a good friend Izuku. It's time we change hero society now.

Tomura 2: The final boss...the last one we will need to beat. I can't believe it has arrived so soon.
Izuku: Let me get used to the functions of this suit. Then, we will plan.

Later

Kaina: So All Might's daughter has gone mad.

Izuku: You will help take care of her.

Kaina: What's in it for me?

Izuku: You will be free. Free to live your life. After all, Izumi kinda obliterated the whole HPSC.
Kaina:...

AFO: Don't worry. It'll all be over.

Toshinori 2: INDEED!

Kaina: A-All Might?!

Toshinori 2: An All Might of a different world!

There was a crowd of people in the area, heroes, villains alike ready for the confrontation as Izuku activates his suit.

Izuku: She's grown very powerful. There are...others helping her. The vestiges. The corrupted wielders.

AFO: Of one for all.

Toshinori 2:...

Izuku: I'LL BE THE BAIT FOR HER, AND EVERYONE ELSE WILL FOLLOW!

Izuku clicks his suit once more, this time activating all its functions as AFO increases the toughness of it just to make sure while keeping Izuku safe.

Izumi:You...DDDEEEKKKUUU!!!!!

Izuku: WE FINALLY MEET AGAIN IZUMI!!!! ARE YOU READY TO SETTLE THIS ONCE AND FOR ALL?!

Izumi: I'LL KILL YOU!!!!!!!

Izuku: AHAHAHAHAHAHA!

Izuku: I AM HERE! 'All the mistakes leading up to this point...our inevitable confrontation...I can't believe it points to this. OH GOD I QUOTE ALL MIGHT WHAT THE FUCK!'

BOOSTERS ACTIVATE

The building he was on shatters as he flew forward, generating booms as he reels his fist back.
Izuku: SISTER! LET'S SETTLE THIS ONCE AND FOR ALL!!!!!

Izumi: DAMN DEKU! I CAN FINALLY KILL YOU NOW!!!

BOOM*

Guns are used in the suit by the way.