Preface-

This is an AU. In this AU after All Might told Izuku that he couldn't be a hero he left and Izuku decided to jump from the building and they only found a pool of blood and declared him dead. A few months later there is news of a new vigilante named Zero. He is known as a master hacker and also his quirk is unknown. He has been shown to easily overpower villains in strength and speed. Hitoshi Shinso is also in class 1A.

?-

So, the League of Villains has decided to attack the USJ, specifically class 1A. Probably after All Might. Welp, I guess I should suit up and help.

I arrived there a few minutes later with my jumpsuit and mask on. My semi's on my back with all the rubber bullets I would ever need. This is going to be fun.

I kicked the door and ran in. I then noticed a bunch of thugs fighting the pro Eraser Head. "Looks like you could use some help," I said, jumping next to him.

"Who are you?" he asked.

"Zero."

"Great, a vigilante. I got this, just keep the students safe for me," he told me.

"Alright, I'll do my best," I ran off. I quickly went to the water zone and saw a few kids.

"Need some help? Eraser sent me," I said, hiding with them.

"Tell me, can we truly trust you?" the one with purple hair and was in a UA tracksuit.

"I know about your quirk," I said. "You can trust me," I was forced to say.

"Well, there we go," the girl in an outfit that looked like a frog.

"Happy?"

"I guess," he sighed.

"Alright, we're going to get rid of those that are trying to get you. While your quirks might not be exactly suited for combat you should be able to help," I said, trying to calm down their nerves.

"What about me?" the kid with purple balls on his head asked.

"Mineta, your balls can stick to others right?"

"Yes, how do you know my name?"

"I'm a hacker, and you can immobilize them. Hitoshi you can have one of them get the rest over here. Tsuyu can use her tongue to throw them."

"What are you going to do?"

"I'm going to knock them out," I said, taking out my gun.

"Who are you?" Tsuyu asked.

"I'm known as Zero."

"The vigilante?" Mineta exclaimed.

"Yes, now let's go," I said looking at Hitoshi.

"Alright, hey you," he said to the nearest thug.

"What?" he asked before his eyes glazed over.

"Get the others over here."

"Hey, guys I think I found something interesting," he yelled.

"What did you, what the crap," one dude said as one of the purple balls landed on his chest.

I then started shooting them and watched as a long tounge grabbed three of them and threw them as they were stuck together. After a few minutes there was a loud crash.

"What was that?" Mineta asked.

"I don't know, Eraser told me to keep you safe, so stay down I'll be back," I said, putting my gun back. I snuck to where the sound was and saw Eraser Head being held down by a giant dude with black skin and a bird-like beak and his brain showing. I'll just hit his brain, I'm assuming he will get annoyed and come after me, after that I'll come up with something. "Take this," I whispered as I sniped him.

"Argh!" he yelled.

"Huh? I didn't think that any of them used guns, and we don't have any either so who is it? I didn't calculate this. Nomu, go find our unwanted guest," a dude with hands all over him said fidgeting.

Looks like he's the ring leader, don't know much about him. I thought before I watched the big dude come rushing in my direction. Well, crap. I then jumped up and ran as fast as I could. That is when the doors busted open, and in came All Might, the symbol of peace himself. He busted through the doors and landed right between me and nomu.

"No need to fear, for I am here!" he shouted.

"They're after you, you know that right?" I asked.

"I don't know who you are, but sadly yes," he said.

"Careful, that thing took down Eraser Head. I don't know what it's quirk is, he seems both fast and strong."

"I will be able to over power him," he confidently said, getting into a fighting stance.

"Even with your injury?"

"How- I'll talk to you later."

The two of them then collided in a battle of strength vs. strength. After hundreds of hits All Might sent Nomu flying out of the USJ. He then collapsed as all of the villains disappeared.

"Kid, we need to talk," he said as his form dissipated.

"Can't hold that for too long can you?" I asked.

"Hey, are you alright All Might?" a kid I haven't met asked.

"You go with the other's, I'll make sure he's fine," Cementos said.

"Alright," the kid said, walking away.

"So, what do you want to talk about?"

"How do you know about this form?"

"I can hack anything, I've seen you on cameras," I said.

"Alright, how about my injury?"

"I said anything, hospitals included."

"Why don't you be a hero?"

"Because, I was told I couldn't be one, so I became the next best thing."

"I need to do something soon. I think it should be you. My power is called One for All, it gets passed down each generation. I want you to be my successor."

"So, you're telling me that you can give me your quirk? Not a chance, I came to help because it was the right thing to do. I'll be leaving now," I said running in the other direction, disappearing. So, I could get his quirk, right now that wouldn't work. I just hope I can get them to believe me.

2 Months Later-

So, they decided to attack Hosu. I should be able to get there on my motorcycle. I thought, getting on my bike. I then raced off, but before I encountered one of the nomus I saw two kids fighting Stain. What the crap is Stain doing?

"Tenya, we need to be careful," a kid with white and red hair.

"I know this Shoto," the kid who looks a lot like Ingenium.

That's his little brother! And that's Endavor's kid. I can't let him just attack them.

"Stain, what are you doing?!" I yelled, running up behind him.

"Zero? Don't interfere with me," he said.

"I'll admit, I don't fully agree with what you do, but you can't attack kids. Let them go now," I demanded.

"No, they chose to fight me," he said.

"Then I'll end you," I said.

"How could you do that? I know everything about you, I taught you to fight!"

"You don't think I haven't devised a plan to take you down?"

"Don't this is my fight!" Tenya, as he was called, said.

"No, I didn't take him down before, it's my job," I said.

"Then we'll help," the other kid said.

"Alright, I need you to use your flames and then use your ice to cool off his engines," I commanded him.

"How do, hacker, I forgot," he said.

"I have a way to get him down. I just need time to prepare," I said, taking out my special clip.

"Well, I should be able to use that twice," Tenya said.

"I'm still not used to my flames," Shoto said.

And then, they attacked. They kept Stain on the move, after a few minutes my gun was ready. I then aimed and opened fire. While he sliced the first two bullets, the third broke his blade, and hit him right square in the forehead, and knocked him out.

"How did you do that?" Shoto asked.

"Simple, I used rubber bullets that had a harder case on the outside. Your classmate's quirk gave me the idea."

"Of course, thank you," Tenya said.

"Well, I'm out," I said, throwing my leg over my bike. I then sped away. Only to be stopped a few miles away. "What do you want?"

"Simple, I want you to join us, you've been helping us get rid of people in our way before. I'm even willing to look past when you helped the students," the dude with hands said.

"Fine, but I'll stay at my own base, and I'll even help you get the one kid who could help you," I said.

"Oh, who's that?"

"His name is Bakugo, he's in class 1A. I also know when to get him. In a few weeks they will be on a special training camp. That is when we get him, you can also show the heroes that you know more than they think," I smiled.

"Heh, I like your thinking. Why help us if you don't want us attacking students?"

"I don't like hurting innocents, they are innocent as of now, heroes aren't," I explained.

"Well, let's get you to the hideout, Kurogiri if you would."

"Alright," the man in a shadow that had a suit on. I then followed them into a portal. I walked into a bar.

"So, why the jumpsuit?"

"It's what I had, but now I think that I should change," I said.

"Who the crap is this?" a man with scars and burns all over his body.

"The new recruit, this is Dabi," he said, gesturing to the other man.

"Sup, name's Zero," I said.

"You look like a hero wannabe," he said.

"You would know all about heroes, seeing as your father's one," I said, I've seen him fight. His blue flames and eyes, he must be a Todoroki.

"How would you know that?"

"I'm a hacker, I've seen you fight in videos, and your eyes. If you pay attention it's quite easy."

"Heh, sounds like a good info-broker."

"I have also taken down more people than you could count."

"Well, what's next?"

"In a few weeks we will attack Class 1A, capture a kid named Bakugo," Shigaraki said.

"I would also expect a few more people wanting to join because they will probably say that the hero killer was a part of your group. I know several people who were inspired by him."

"Well, let's see," Shigaraki laughed.

"Why is his bike in here too?" Dabi asked.

"I'll be out in a bit, just need to know where this is," I said.

"Where are you going?" Kurogiri asked.

"My place, I'm gonna change what I'm wearing."

"Well, be back tomorrow."

"I will," I said, riding to my place memorizing the route. I got back to the place where I was staying. I took out what clothes I had and decided on a dress shirt, green tie, black slacks, and green gloves. I also kept my mask, but removed the goggles. I then decided to put a black vest that is also bullet proof on. I then grabbed a pocket knife. This will work, I thought.

The next day I went back and when I arrived saw two people outside, a girl in a school uniform, and a lizard man with dozens of blades.

"What do you want?" I asked.

"We wanna join," the man said.

"Yeah, we heard Mr. Stainy was a member and we want to join," the girl said.

"Well, I'll let you talk to the boss," I said, opening the door. "Hey, we got some new comers."

"Ah, hey Zero, and who do we have here?" Shigaraki asked.

"You can call me Spinner, I think that Stain was doing the right thing for people like me," Spinner said.

"I'm Toga Himiko, I wanna be like . I want to be Stainy," she said with a sadistic smile.

"Well, I can train you like he trained me," I said.

"You were his apprentice?" she asked.

"No, but he saved me, then he trained me to get stronger," I explained.

"So are we in?" Spinner asked.

"I don't mind, but you have to listen to what you are told," Shigaraki said.

"If you don't I'll burn you alive," Dabi said walking in. "Like the new threads."

"Thanks."

So, we trained and got a few more members and then the day came. All of us except Shigaraki and Kurogiri went into the woods. We knew that the teachers were there and so was the team the Pussycats. We were also told that if we could catch one or two of them that it would also be good. That would be Compress's job. At first things went right, but then the students started fighting back. Toga and I were teamed up and came across one of the ones that I saved.

"Zero?" Tsuyu asked.

"Sup," I said.

"Wait, I thought you fought villains," she said.

"Na, I just took people who were doing wrong. Now I'm helping people who want to do the same."

"Wait, you're the one who helped us at the USJ," the other girl said.

"Yeah, I haven't met you yet. Your name is Uraraka right?"

"How do you?"

"I'm a hacker, UA is easily hacked."

"Hey babe, they're two of them on the list, right?"

"Yeah, look, I don't want to take you down so just let us do what we have to do," I said.

"What's that?"

"Simple, I just need some of your blood," Toga said.

"B-blood?" Tsuyu asked.

"Yeah, it's for my quirk," she smiled.

"Please, I don't want to use force," I pleaded.

"H-how much?" Uraraka asked.

"Oh, just a cup or two, each."

"Asui, I think that we should just give it to them."

"Are you sure?"

"Yeah, just don't make it hurt," she said, holding her arm out. Toga then stuck the needle in and took some from both.

"Thanks, now this is to just keep you still," I said, throwing rope around their hands.

"Wait, I thought you said you didn't want to use force," she asked.

"Yeah, this is to keep you safe. The others won't be as kind as me," I said.

"Yeah, he's the best," Toga said, hugging my neck.

"Let's go," I said.

We went to the meeting place and saw Compress running from students.

"A bit of assistance if you would please," he said running.

"I got this," I said, taking my pocket knife out.

"Oops," he said as his compressed balls fell out. One burst open and Bakugo was there.

"You're coming with us," I said.

"Deku?! Why are you here? You were good, you wanted to be a hero, why?" he asked.

"The kid has got a darkside, best believe it. Push too far you'll see," Toga said.

"No, he was good," Bakugo said.

"The kid has got a darkside, back against the wall," Spinner said.

"The kid has got a darkside, best believe, it's the best trick up his sleeve," Compress said.

"The kid has got a darkside, that you don't want to meet at all," Spinner said, walking up.

"No, he was a good person, why would he be bad?"

"They always picked on him in the class. He would wake up with anxiety attacks," Toga would explain, with what I told her.

"Till I put the semi-automatic on my back, I had murder in my eyes. I had murder in my eyes. I wore silence like a mask."

"Now he's making up for all the violence in his past, took it from a father who never bothered to ask what his son had on his mind," Dabi said.

"Why, what father? You don't have a father," he said.

"Exactly," I said, grabbing him. I then turned him around and put my knife to his throat. "Now, don't come any closer," I said.

"Bakugo, fight back," a kid with spiky red hair said.

"Don't help me," he said.

"Farewell," I said, as a portal appeared. We all walked through, me last with Bakugo.

AN-

So, this was a new idea I had. I actually used some of the lyrics from a song. The song is Darkside by Grandson also expect several other songs in the story. I will credit all of the artists and songs in the author's note.

I don't own Darkside nor MHA, that credit goes to the people who made them and own the rights to them.