Massacre

Izuku is going to be involved in the USJ and he has the plan to show that him and Shinso are not working together like Aizawa theorizes. Izuku wants Shinso to reach his dreams which Izuku believes in him. Izuku has plans and Shinso still wants to help Izuku to prevent him from going fully insane. Let's get down to it.

The League's Base

Izuku came to the bar to help Tomura on how All for One works and how to properly use multiple quirks. Izuku told Aizawa about the attack on the USJ to bring more 'targets' for Tomura's practice. Izuku has 52 AQs to show Tomura his combinations which can be proven powerful. Izuku told Shinso about the attack that he should come to help the heroes to prevent Tomura from going on a murderous rampage. Izuku could see it in Tomura's eyes that give him the quirk was like giving a toddler a nuke and he wants to murder at the USJ.

Izuku believed that he was the Symbol of Insanity because he was a mad scientist that has very little ethics and insane methods that weren't allowed by law. He had the quirks to defeat many heroes and mentioning the All Might killing nomu will bring stronger heroes. Izuku was fueled by revenge and nothing else, he wanted it badly, but he had limits for now. He hacked into the USJ security cameras to see Mirio was there, which Izuku smiled, "The target is there… time to go."

Izuku walked up to Tomura to ask, "You ready to learn about quirk combinations and why they are important."

Tomura smiled and Kurogiri opened a portal to get everyone to the USJ to do the strongest attack with such powerful quirk users.

USJ

All Might, the rest of the top 20 heroes, the teachers, The Big Three and Class 1A students were there wait for the league to come out to fight them. They saw the warp gate open which Tomura, Izuku, and Kurogiri came out then the All Might killing nomu came out. Tomura said, "Why there this many NPCs here?"

Izuku chuckled, "I brought them here for one thing Tomura…"

Kurogiri and Tomura looked at him which Tomura asked, "And that is?"

Izuku laughed like a madman, "For target practice!"

Izuku put his hand on the ground to say, "AQ #32: States of Matter!"

The ground under the heroes became liquid and the solidified when the heroes were neck deep in rock, which Tomura and Kurogiri in shock which Izuku said, "#32 allows the user to turn anything they touch into a different state of matter. They can make solid to liquid, liquid to gas, gas to plasma, plasma to solid, and so on. An interesting quirk that I obtain a while ago, indeed useful like #49: Overhaul."

Some of the heroes like All Might and Mirio got out which Izuku made a black ball while chanting, "#5: Multiplier, #11: Dark Matter times 5, #18: Gravity times 6, #19: Black Lightning times 3, and #48: Anti Matter times 2."

Izuku threw the ball to cause a super big explosion which destroyed half the USJ there are survivors, but 10 heroes died from the blast. Tomura and Kurogiri were in shock by the power which Izuku said, "I call that one 'Black Nuke'."

All Might protected everyone else which All Might charged at Izuku but the nomu got in front of All Might to fight him. Aizawa decided to step in but Izuku said, "No so fast Aizawa, #51: Erasure!"

Aizawa got his quirk erasing quirk erased which he found himself useless which Bakugo flew at Izuku. Kurogiri was about to warp him away but Izuku rose his hand to stop him which Izuku chanted, "#5: Multiplier and #15 Projectile Halt times 2."

Bakugo stopped in his place and couldn't move, which Izuku said, "#18: Gravity, #28: Clones, and #36: Confidence Manipulation."

Bakugo fell to the ground and couldn't move because the gravity was pushing him to ground and he couldn't move. Izuku then split apart to make 2 more clones of himself, then Bakugo went from being angry to being scaried. Izuku told his clones to deal with Aizawa and the teachers. Izuku went to Bakugo and said, "You see Tomura #36: Confidence Manipulation, allows the user to make people around them super confident or scaried shit less like Bakugo here. My clones will fight the heroes while we deal with everyone else. Now let's see this 'Air Cannon'."

Tomura the chanted, "Air Cannon, Springlike Limbs, Kinetic Booster times four, and Strength Enhancer times three."

Tomura made a powerful shockwave from his arm which blasted All Might back to UA, Izuku clapped his hands while Tomura was feeling a little bit of pain. Izuku said, "That was impressive Tomura, that looks like fun. I see you are still working on the pain after doing any combinations bigger than three."

Tomura asked, "How do you deal with it?"

Izuku chuckled, "I train on it and I have #4: Painless, a quirk that takes away pain from the user. I could activate Painless all day and feel no pain."

Izuku looked to see one of his clones were down which Izuku said, "I'm going to use my most powerful quirk which then I will ask you why it's so powerful."

Tomura nodded which Izuku used his came up behind Mirio to then grab him to say, "#45: Moral Compass"

Mirio face changed and he went from attacking the clone and Izuku to attacking the heroes."

Izuku came back to Tomura which he said, "You made him fight for us, that was super cool and overpowered."

Izuku chuckled, "Moral Compass changes the person that the user touches, it turns people into their moral opposites. Lemillion is now a villain which the quirk's effect only lasts three days."

They watched as Lemillion and Izuku's clone fought the heroes and students which All Might came in flying towards Izuku. Izuku said, "#5: Multiplier, #12: Shock Absorption times seven, #21: Impact Redirection, #9: Steel Bones times four, #24: Rubber Body times three, and #37: Absorb and Release."

All Might punched Izuku in the face to break his mask, but Izuku wasn't harmed which Izuku laughed and punch All Might with the same power as his punch. All Might flew far back but landed on his feet to look at Izuku which Izuku's mask fell off, Izuku said, "Oh dear, my mask fell off. Well I can't cry over spilled milk."

All Might looked at Izuku's face and then recognized him, Izuku smiled, "What is wrong All Might? Do you remember who I am? If you don't allow me to remind you?"

Izuku then made another 'Black Nuke' to say, "I'm Izuku Midoriya also known as Doctor Insanity. I was the quirkless boy whose dream you destroyed, I have come for revenge and for the death of Bakugo!"

Bakugo nervously asked, "Deku, why are you doing this?"

Izuku laughed, "I love this new you, you are rightfully afraid just like I was afraid for my life when you bullied and abused me. I like this new you so much, I think I will keep you in that state for the rest of your life."

All Might was in shock that Doctor Insanity was a teen and he remembered that he destroyed his dream. He felt bad about it every day, which he has been looking for him to apologize about it. Now he found him, but he could see in his eyes that he wasn't the same teen as when he met him. All Might said, "Young Midoriya, I'm sorry about what I said on that day."

Izuku laughed and said, "You know it's too late for that."

Izuku threw the ball at All Might until it disappeared which then Shinso appeared to the fight. Izuku said, "Well Brainwash, I didn't expect you to be here of all places."

Shinso said, "Doctor Insanity, your madness must be stopped and the only way to stop it… is to stop you. You have been blinded by revenge and madness that you have abandon your humanity."

Izuku smiled, "Show me your power!"

The ground and dust started circling Izuku which he laughed, "#5: Multiplier, #1: Super Strength times 10, #3: Regeneration times 10, #9: Steel Bones times 10, #12: Shock Absoprtion times 10, #20: Flight, #25: Engine Arms times 10, #29: Metal Spikes, #34: Hard Light, #37: Absorb and Release times 10, and #39: Weapon Hands."

Everyone looked at Izuku in horror a he was in midair in a monster like form covered in metal spikes, an armor made of light covering him, one of his hands look like a sword, engine pipes came out of his arms, and was big as All Might. Izuku said, "This is one of my favorite combinations, #5 makes things much easier on me. Now Brainwash… what will you do?"

Shinso said, "I may not have mastered the quirks like you but I know what I can do."

Shinso took a breath to look at Izuku to say, "Multiplier, Super Strength times 6, Regeneration times 6, Painless times 6, Power Drain times 6, Steel Bones times 6, Shock Absorption times 6, and Impact Redirection times 3."

When Shinso was done, Izuku chuckled, "You are on six and the only thing saving you would be Impact Redirection. But let's see if your theory works!"

Izuku flew at Shinso and Shinso readied himself from the impact. Their fists met which caused an earthquake right under them which no one around them could get up from. Izuku said, "#18: Gravity times 10"

Shinso quickly said, "Emitter Redirection times 6."

Then they both said, "Erasure."

They cancelled each other's quirk out which Mirio punched Shinso to protect Izuku.

Izuku laughed, "Mirio!"

Mirio stood next to Izuku which Izuku said, "Time to go back to base, I got a side project that involves you."

Tomura asked, "What about my training with multiple quirks?"

Izuku said, "You got this, you just try to find some quirks and think what should be added to make it more powerful."

Izuku got Mirio on his back which Izuku chanted, "#2: Warp Jump"

Izuku jumped and they disappeared which All Might was super pissed which the nomu and Izuku's last clone started fighting him while Kurogiri and Tomura helped them out. Bakugo was still being a scared little bitch because of Confidence Manipulation. Shinso used a few combinations to slaughter the nomu and Izuku's last clone to save All Might which then Tomura said, "Time to retreat."

Tomura and Kurogiri got warped to their base which Shinso said, "Warp Jump"

Shinso jumped and warped away before Aizawa could stop him, All Might was injured, 12 heroes were now dead, the students were fine except Bakugo, and Mirio was taken. The school counselor, Hound Dog was shocked by Bakugo's state of mind. Bakugo went from cocky brat to scared and unsure teen which Hound Dog has never see a quirk that does that to a person. The teachers meet at the meeting room to discuss what happened at the USJ, which they now have the identity of Doctor Insanity and they can make it official that Brainwash was fighting against him.

Izuku's Hideout

Izuku took some blood from Mirio which Mirio asked, "What is the blood for?"

Izuku said, "I have had an interest in One for All since I discovered All for One. I mostly interested in the passing part like All for One but All for One can't pass itself. One for All can by DNA and if the wielder wants it to pass, which I want that part of the quirk."

Mirio smirked, "Why do you need that part of the quirk?"

Izuku giggled, "For a little side project of mine… but for now I would like to enhance you a little bit."

Mirio grinned, "I would love these enhancements."

Izuku opened a draw to reveal a baggy with the words 'Mirio' which Izuku gave it to Mirio which Izuku said, "Water bottles are on your left."

Mirio went for the water bottles then took the AQs which Mirio asked, "Can I ask what enhancements these are?"

Izuku said, "Three Steel Bones, three Flexible Bones, two Painless, two Regeneration, and three Extreme Endurance. Your bones will be harder to break, you won't feel much pain from using One for All if the quirk breaks you bones, and your endurances will skyrocket like hell."

Eri came out to say, "Papa…"

Izuku said, "Sorry Mirio, this is Eri and she lives here with me. Don't mind her but if she asks for help, then help her."

Mirio nodded which Izuku went to Eri to say, "Yes Eri."

Eri said, "I'm hungry."

Izuku said, "Oh I got this."

Izuku made some eggs, toast, and an apple turnover quickly to feed her, Mirio asked, "That was fast, but doesn't apple turnovers require some skill."

Izuku smiled, "#27: High Specs, the same quirk as Nezu is mine as well. Ever since I found the man who made Nezu, I saw that the man had Nezu's blood… I killed the man for it because it was too good to pass up."

Mirio laughed, "If I was in your situation I would do it too."

Izuku got back to work which Izuku warped Mirio to a few places to pick up things and attack certain places. Which Izuku looked at Mirio's blood to say, "My ultimate creation will be born and then the world will fall to my knees, but I must first learn about the reason for the mutation."

Izuku looked at it through the microscope while Mirio was doing his dirty work, Eri eating breakfast, and Shinso was at school.

UA

The teachers, Nezu, All Might, Sir Nighteye, and some of the pro heroes who survived the USJ attack were in the meeting room. They just finished talking about the league members which then they focused on Izuku, Nezu said, "Izuku Midoriya, a teenager who ran away from home about six months ago is the identity of Doctor Insanity. He caused most of the destruction at the USJ which he also took Mirio with him. He used a quirk he called 'Moral Compass' which allows the user to change the morals of anyone around them. Mirio now has the morals of a villain which we need to find them and bring Mirio back to his original self."

Sir said, "Someone with a quirk like that is beyond dangerous and to use it on someone like Mirio is even worse. Mr. Midoriya shouldn't be on the street with this kind of power."

Midnight asked, "Why would someone like Mr. Midoriya become a twisted villain?"

Aizawa said, "All Might, you seem to have known the kid and Bakugo does too. All Might can you shed some light on us."

All Might told his story t everyone which everyone looked at him in shame but then Nezu said, "Izuku is after revenge on the world of quirks and wants control as well. To give power to those he deems worth and take from those who don't deserve a quirk."

Hound Dog asked, "Bakugo is afraid of his own shadow, what kind of quirk does that?"

Aizawa said, "What I saw he used a quirk he called 'Confidence Manipulation' which it gives and takes a person's confidence which he must have taken all of Young Bakugo's confidence. But Mr. Midoriya has a personal grudge on him which we need to get Bakugo to reveal what it is."

Nezu said, "As for Brainwash, he is fighting against Izuku which they can almost fight toe to toe with each other. But Brainwash hasn't mastered his quirks fully which he is our only chance of fighting Izuku. Brainwash only used his quirks up to six times stronger than they original were. Brainwash is training himself to defeat Izuku and to put an end to his artificial quirks. Brainwash believes that by staining his hands with evil, he will destroy the greater evil."

Everyone was in shock how far someone would go in order to stop some one like that, which Aizawa said, "He looks like someone who knows him and is trying to stop Doctor Insanity not Izuku. Which I'm going to find Brainwash in his favorite places."

They were about to agree with him but Nezu allowed Aizawa to do it, which Aizawa thought to himself, 'I feel like I know who Brainwash is, but I can't put my finger on it.'

Aizawa saw Shinso walking by himself to the roof for lunch like usual, which he followed. Shinso ate his lunch then he started doing stretches and mediation to let himself drift away which Shinso asked, "Do you want to join?"

Aizawa said, "I was wondering when you would notice me."

Shinso said, "I noticed you when you saw me and followed me up here."

Aizawa chuckled then sat next to him to ask, "Do you have friends?"

Shinso chuckled, "Friends? Not with my quirk, no one will come near me or look at me."

Aizawa saw how lonely Shinso was but he wasn't going to let him be lonely, because Shinso reminded him of himself when he was younger. Shinso asked, "If I make it to the top three in the sports festival, you will put me in your class personal right?"

Aizawa said, "That's correct."

Shinso grinned, "I will not disappoint you, Aizawa-sensei."

Shinso then went back to his class which Aizawa thought to himself, 'I want him in my class no matter what, I know that he will get in the final event. Even if he doesn't get top three, I will take him in for making it in the final event.'

Aizawa chuckled, "I have gotten soft, haven't I?"