Disclaimer: I don't own My Hero Academia

At an unknown location

"Haha, so that brat Tomura is planning on taking some Nomu to Hosu city," the voice said.

"Yes," Viper confirmed. "He has become jealous of the Hero-Killer and seeks to remove his name from the news. To achieve that he intends to create chaos using these creatures."

The voice giggled.

"And just how many is AFO giving him?" asked the voice.

"Three," Viper informed.

"Perfect. Three is rather small so give him 'that' one as well. This will be the perfect opportunity to do it. Accidents do happen after all," the voice replied sinisterly.

Viper shifted uncomfortably. This man was one of few that could scare her.

"Sir is this really necessary?" Viper asked carefully. "He has contributed so much to the League and has even perfected the enhancement drug as well as others. Is it really necessary to kill him?"

As soon as she had said that Viper felt a sharp pain in her head and dropped to her knees. Gasping for air she stared up at the screen.

"Have you already forgotten who you serve Viper, or do I have to remind you? Why are you even questioning my orders anyway?" the voice demanded.

"No, I have not. However, AFO has grown rather fond of him. I just want to avoid starting an all-out war over the death of something you despise," she explained.

It was the best explanation she could give, rather the only one he would accept. Personally, she had nothing against Deku. When she had hacked his school's system (it was one of her side jobs for the League) she had been impressed with his intelligence, even more so when she saw his quirk analysis abilities. Working alongside him as S1 had moved some of the League's projects faster. Honestly, she found it hard to believe his school had treated him like dirt when he was this gifted.

"Don't worry about him. As long you complete 'that' it should be no problem. Besides with what I've got planned well, even he won't expect it," the voice laughed. "Anyways you've set the Nomu the way I wanted it right?"

"Of course. When it is deployed it will seek out and eliminate its target. In this case Deku," Viper explained.

"Good. And Viper because you want to avoid suspicion so much you can have it kill that quirkless shit quickly. Pretty nice of me don't you think?" the voice said with glee.

Viper nodded. Compared to what he usually did to quirkless people a quick death was rather nice. Nothing more was said between the pair, so she logged off to continue her work.

The man who had been talking to her walked over to the sink to wash his face. When he stared in the mirror, he saw a man with a muscular build like All Might. Short hair (shaved around the sides) and eyes as red as blood. Dressed in a crimson armoured suit, he grinned with malice.

"AFO, your day is coming. The same can be said for all those brats who work for you. And as for that quirkless filth you brought to the League, well, his death will be the first stepping stone to achieving my goal. One more atrocity to add to my list."

With that Atrocity walked out.

Hosu City

"You've definitely gotten the hang of all this," Stain applauded.

It had only been five days since he and Deku's 'internship' began but things were progressing quickly. In a short span of time Deku had learned to focus his senses so they would be even sharper than before and mastered the knife skills he was taught.

As for killing intent, that had been a little harder to work with as he had no desire to kill. To help Stain told him to think about the one that made him suffer so much and what he wanted to do to him, he told him to channel his anger and rage to attribute it as some form of bloodlust. It took a while, but he was finally able to produce some form of it, though not very powerful.

Still, it was better than nothing.

To add to it all his mobility and balance had increased drastically from climbing and parkouring across various buildings.

"You've done enough for today so take a break," Stain told him.

"You sure?" Stain nodded.

Their conversation was cut short however by an assailant's face kicking Stain at high speed.

He was wearing All Might themed clothes (mainly a hoodie), a black mask to cover his face, gloves and goggles.

Stain staggered slightly but regained his balance and readied his sword until he saw who it was.

"Managing to land a hit on me, you've gotten stronger," Stain complimented the assailant. "Still though, I never expected to see you here. Shouldn't you be out with Knuckleduster and Pop-Step patrolling your own area?"

"Don't try and flatter me," the man snarled. "I was just passing by. As for my friends, they can handle things just fine without me."

Izuku had no idea what was going on. Stain clearly knew this man, yet he didn't seem annoyed by the assault. Furthermore, he was not irritated by his appearance, which meant he couldn't have been one of the false heroes Stain hated.

As Izuku inspected him further he noticed how he was crouched down in a crawling position. Given this information, Izuku guessed that this must be that vigilante Stain told him about.

"Um, excuse me," he started attracting the man's attention. "Would you be the Crawler by any chance?"

Suddenly the man moved toward him with such speed and grabbed his hands. It looked as though he were about to cry tears of joy.

"You're absolutely right," he said with joy. "Finally, someone gets my name right."

Izuku looked at Stain who simply shrugged. Crawler changed to a serious expression.

"Wait hold on. If you're with him, is he trying to kill you?" he asked.

"No, I'm sort of on an internship with him for the week learning new fighting skills and how the world works," Izuku explained a little sheepishly.

Crawler was stunned, but that quickly turned into anger.

"What the hell Stain!" he yelled. "I thought you said you didn't involve children in your so-called war."

The hero-killer sighed. "I'm doing this as a favour to a friend of mine. I'm not involving him or anything, I'm just teaching some new things, one of which isn't how to kill. I even put my crusade on hold because I was asked to."

What he didn't mention was that Razor had made him swear not to kill anyone while he was out with Deku. It seemed that of all the things he was she did not want him to become an accomplice to murder. He understood. Once you crossed that line there was no going back, ever.

"Wait so is he a vigilante then. Someone training to be a hero wouldn't work with you?" Crawler said suspiciously.

"No, he's a villain. Not your usual one though, he is mainly an analysis and support one. Kids actually a member of the League," Stain explained. "Though let me tell you now, he is one of the nicer members."

Crawler slowly digested the information. He had heard of the League even before the attack on UA. One of the perks of being a vigilante meant you heard about things heroes normally would not.

Also, he knew Stain well enough to know that he wouldn't just work with villains, the man absolutely despised them. However, if he did have a friend for who he was willing to do this for then it was possible.

"So, wait does that mean you don't kill?" Crawler asked Izuku.

He just wanted to be sure. The boy in black nodded in response. With this, he relaxed. However, he moved towards Stain and punched across the face.

Izuku was surprised that Stain was just letting this happen. He could've easily dodged.

"I'm guessing this is about Ingenium," he mentioned.

"You're damn well right. The guys never gonna be able to walk again thanks to you. His life as a hero is over," Crawler yelled. "You put a good man out of commission. He wasn't even one of those false heroes you hate so much, he was genuine."

There were tears in his eyes now. Izuku felt bad for the man. He remembered how Stain had described Ingenium, rather the Crawler's description. Izuku could tell he looked up to the man a lot. It was the same way he had looked at All Might.

Stain wore the same stoic expression. He was about to speak when they all heard an explosion in the distance. Stain immediately started climbing towards the roof.

Crawler was about to protest when Izuku grabbed him and used his grappling hook to hoist them both to the roof. Climbing up, Izuku could see fire coming from another part of the city. A figure flew out from the smoke, one Izuku recognised.

"Nomu," he whispered.

The other two turned to him.

"You know that thing," Crawler inquired.

"It was a weapon the League created that was supposed to defeat All Might. But some things are not right. That one was defeated. Also, it didn't have wings or grey skin," Izuku explained. "This one must be brand new."

"I bet it's that brat from before," Stain snarled. "Uh, I should have just killed him when I had the chance."

Izuku knew he meant Tomura. Given the man's personality, Izuku wouldn't put it past him to do something like this.

"Maybe we should all get off the roof first so we can work out our next move," Crawler suggested.

Stain leapt to the alley below. Izuku grabbed Crawler and used his grappling hook to bring them both down. Stain ordered them both to wait while he checked things out.

"So, if you know what that thing is do you know how to defeat it?" Crawler asked.

"No sorry. The first time I even saw Nomu was during the USJ Incident, and even then, I didn't know about any of his powers. I was only there to get revenge on someone," Izuku told him.

The Crawlers eyes narrowed at this.

"Revenge?" he questioned.

"The person I fought against, and won, was my childhood bully. He used to beat the crap out of me every day for being quirkless, until that one incident when I finally put him in his place," Izuku said with a bit of pride. "What about you though, Stain said you were a vigilante."

"Well yeah. I work with two others to keep my area safe from threats most heroes and police wouldn't see or deal with. We're considered villains but technically we're heroes," Crawler replied.

For a moment they said nothing.

"You don't seem like a bad person. Just how did you end up becoming a villain?" he asked.

Izuku hesitated for a moment. This man was a stranger whom he had just met. He didn't have any reason to tell him.

"Oh, I'm sorry," Crawler apologised after noticing Izuku's discomfort. "I guess that was a bit insensitive. We just met and…why would you tell a guy you just met your life story?"

"Don't forget you kicked my mentor in the face," Izuku reminded him. "And punched him for good measure."

Crawler chuckled. "Fair point. Question just came out of nowhere. Forget I said anything."

Beneath his mask, Izuku pursed his lips. Crawler was not pushing him for answers (much to his relief), however, there was a part of Izuku that wanted him to know. He really didn't have a reason to tell him the whole story, but maybe he could just give a general outline.

"I told you I was bullied for being quirkless. When I was pushed to a certain point where I could no longer take it and tried to end it all. The League saved me and took me in," Izuku told him. "They saw something in me no one else ever had and filled me with hope and reason to live again."

Crawler said nothing. He knew quirkless people did not have an easy life in society. His colleague and master Knuckleduster was quirkless but that never stopped him. He always fought any villains that came his way and even defeated Stain once. Strangely enough, Koichi had never once asked the older man about his daily life, since there had never been much reason to.

"What's your name?" he asked the villain. "You don't have to tell me your real one. I'd just like something to call you."

"It's Deku," Izuku replied. "By the way. Does it seem weird that we're just having a casual conversation while a crisis is going on?"

"Probably but fortunately, there's no one here to judge us," Crawler said.

They both laughed which ceased as soon as they heard yelling a few feet away. They immediately ran to the source only to find Stain standing over a defeated teenager wearing an Ingenium like costume. Stain's sword was covered in blood.

Izuku inspected the teenager's face who was glaring hatefully at Stain. He recognised him as Tenya Iida from class 1A.

"He was a splendid hero who gave me a dream!" Tenya yelled at Stain who returned with a glare.

Izuku and Koichi were confused as to what was going on. Why was Tenya here? Was he looking for Stain?

"I'll kill you!" he roared.

The pair froze at Tenya's words. He had come here to kill Stain.

"Becoming consumed by vengeance for the sake of satisfying your own selfish desires. That is the furthest act from being a hero," Stain scolded.

Not able to stand this any longer Koichi spoke up.

"Stain what the hell is going on? He's just a kid," he asked.

Tenya looked up to see the new arrivals. One was dressed up kinda like All Might, the other dressed in black. There was something familiar about him though.

"He attacked me, what was I supposed to do, just let him kill me?" Stain retorted. "He came after me with the full intent of attaining revenge for my assault on his brother, Ingenium."

"Ingenium," Crawler responded surprised. "You're Tensei's little brother."

Tenya, along with Izuku were surprised. Stain made no change in expression.

"You, you know my brother?" Tenya stammered.

Koichi nodded. "Yeah, I do. He is a good man and an amazing hero. He helped me master my quirk even though I didn't have a hero license." He gazed down at Tenya with a solemn expression. "I truly am sorry about what happened to him."

Tenya didn't speak. Izuku was going over all this in his head. If Crawler knew Ingeniums identity, then they were obviously closer than he thought.

"You should be grateful," Stain piped up. "Crawler here stopped me when I was about to kill your brother and gave me the same rant you were giving me. The only difference was that I actually let him hit me. Well, the second time."

Tenya glared at Stain again.

"Stain would you please leave I'd like to talk with him. Deku you can stay. I need you to help me treat his wounds," Koichi said.

Stain nodded and informed them he would just be in the next alley. Crawler placed Tenya sitting up and motioned for Izuku to come closer to help. He then took out a first aid kit in his pocket.

"Is it just your right arm he got?" Izuku asked.

Tenya nodded as a reply, which was all he needed to hear. He took out one of his regeneration drugs and injected it into his arm causing him to yelp in pain.

"Relax it'll go away in a minute. That'll be faster than treating you," Izuku assured him.

True to his word the wound cleared up as though it had never happened, much to the shock of the other two.

"Well now that that's taken care of, we can talk," Koichi said as he sat across from the boy.

"Tenya," he started. "YOU COMPLETE IDIOT. ARE YOU TRYING TO GET YOURSELF KILLED?!"

The two boys were taken back, however, Crawler wasn't done.

"I understand you're upset about your brother but what the hell? Stain has killed multiple pro heroes all by himself and you thought you could beat him alone. What would Tensei say if he could see you now?" he scolded.

Hearing this only angered Tenya further.

"I inherited my brother's name. I'm the one who has to do it," he angrily retorted. "So don't you dare tell me I shouldn't. If you did save my brother then you should know the condition he is in, you should understand."

"I do understand. However, Tensei happens to be my best friend, so I know about the type of person he is. Believe when I say he wouldn't want you to get revenge," Crawler told him. "He loves you more than anything, and one thing he truly wishes for is for you to become a hero. Can you even imagine the state he would be in you just died or killed someone yourself? Are you that selfish?"

Tenya looked away. Izuku couldn't tell if he was ashamed of his actions or not, but he decided it was finally time to speak up.

"I don't know anything about Ingenium but if he is anything like Crawler described, then I doubt he would want this," he said.

Tenya turned to look at him.

"I know you want to be a hero like your brother, but this isn't the right way. Murder is hardly a heroic act no matter how much one might deserve it. If you did manage to kill Stain, which I seriously doubt is possible, what do you think would happen? Hmm. Do you think you would be praised? No, you would be considered a villain and thrown in prison. So let me tell you now, stop before you can't. It won't end well for you if you don't."

Izuku was not sure where his words were coming from because they felt so natural. He had never been fond of killing by anyone, hero or villain.

Through some miraculous means, Izuku's words resonated with Tenya. Tears were beginning to form. Izuku saw a variety of emotions in his face: shame, regret, anger, and sadness.

Crawler pulled him into a hug.

"It's alright. You don't have to hold it in," Koichi assured the boy.

With that Tenya began to cry hysterically. They were right. He knew they were right. What kind of person was he? To suddenly decide on something this severe. He wasn't a hero; he was a fraud. He had no right to call himself Ingenium.

"Brother I'm sorry," he whispered while still crying.

No one said anything. Izuku and Koichi acknowledged that Tenya had a lot going on and needed to sort it out himself. After a few minutes, Tenya stopped crying and stood up and faced the two.

"Thank you and I'm sorry," he said.

"You've got nothing to apologise for," Koichi told him.

"No, you were right. I shouldn't have acted the way I did, it was foolish of me," he admitted and then turned to Deku. "Thank you also. And, out of curiosity, were you involved in the USJ incident. It's just that you look familiar, and I haven't encountered that many villains."

Izuku nodded. Koichi tensed slightly at this fearing how Tenya would react. Surprisingly, Tenya grinned.

"So, you were the one who defeated Bakugo," he realised.

"How do you know about that?" he asked curiously.

He seriously doubted Katsuki would brag about a loss to anyone.

"I heard a report about it. Also, he was swearing "When I find that bastard in black, I'm gonna kill him". He really hates you," Tenya explained.

'If only you knew,' Izuku thought sarcastically.

Their conversation came to an abrupt end when something large came crashing into the ground near to them generating a loud impact.

It was the winged Nomu from before.

"This thing," Tenya recognized. "What's it doing here? I thought the police had captured it."

The Nomu was staring intently at Izuku.

Recognising its target, it moved with great speed and swung its arm at him. Izuku barely dodged as the creature destroyed the wall behind him. He had Stain and Razor's training to thank for that.

Nomu moved to attack him again, only this time he was pushed out of the way by Crawler using his quirk (a mobility one that required him to be on all fours).

'Why is it attacking me?' Izuku wondered. 'Aren't we on the same side?'

Izuku figured it must be on the enhancement drug. However, from the damage, it was doing it was not as powerful as the first one.

It moved to attack him again only to have its leg chopped off by a familiar katana. Stain stood next to Izuku ready to strike again while the leg quickly regenerated.

"You okay Deku?" he asked concerned.

"Yeah. Although, that thing is trying to kill me for some reason," Deku replied.

"Well then, we had better finish it now. All of you get ready, that includes you Ingenium," Stain exclaimed.

Tenya glared at him.

"Just once I'll do this, after that we're back to being enemies," he explained.

Working with Stain was the last thing he wanted right now. However, he also knew just how dangerous Nomu was. His teacher wrapped in bandages and his classmates' descriptions were enough reason to be worried.

If he hoped to live to see another day to rectify his mistakes, he would need to cooperate with him. Luckily, he would not be alone in this endeavour.

'If he is using the drug then it should wear off in ten minutes, it has been at least twenty since this all started,' Izuku thought.

Standing beside each other the vigilantes, the student, and the villain began their fight against the monster before them.

Hi there! Well, what did you think of that? I bet you did not expect me to include characters from the spin-off manga. When I read it, I couldn't help but wonder if Koichi had some involvement in Ingenium living since he knew both men, also Stain doesn't actually seem like the type to just let someone live to spread his name. Also, what did you think of Atrocity? I have been meaning to introduce him for a while. Next chapter will feature a battle between the four and Nomu. Please review.