A/N: So...This is kind of new for me. Well, sort of. This is my second time writing a vigilante story. The first is a Wattpad exclusive. I should have requested this before but feel free to send your own original Quirks for villains and criminals in general. Just Quirks this time. Not full-on OCs since I'll only write a few chapters for each.

After One and Izuku exchanged phone numbers, they kept in contact ever since. One sent Izuku a location one day and told him to bring a change of clothes. Workout clothes to be more specific. Izuku was a bit confused at first, but when he put the address in his GPS and saw that it was an MMA gym, he started to connect the dots. If he was going to become a vigilante, he would have to learn how to fight first.

He breathed a sigh of relief. He was a little bit worried that One would just throw him into the line of action without even having him learn that key part.

It was a Saturday so he didn't have to worry about school right now.

"Hey mom! I'm going to the gym!" Izuku hollered to his mother.

"Really? How come?" Inko asked.

Izuku didn't think it was appropriate yet to tell her that this stranger saved him from someone trying to take over his body and gave him a Quirk alongside trying to teach him how to use the Quirk while becoming a vigilante at the same time. He didn't want to worry her so he made up a lie on the spot.

"O-Oh, I just want to actually start working out. You know, so I can be in shape for when I'm older. My teen metabolism will only last me so long."

"..."

Izuku was one foot out the door but his heart was racing right now. He didn't get a response just yet from his mother.

"Well alright then. Just be careful!" Inko answered.

Izuku relaxed after hearing her finding that she believed his lie.

The walk wasn't that long. Just about 10 minutes at most. He always passed by there and he would look inside for a little bit, but never actually go in. He didn't know why to be honest. He felt pretty dumb now. All these years of wanting to become a hero and only focusing on the analytical part. Just one person giving him a chance opened his eyes immensely to the bigger picture and what he would have to work on.

"Izuku! Glad you could make it!"

Izuku recognized the voice as One-Sensei. He turned to find he was right behind him with a chocolate shake in hand. Not only that, but he was wearing a different outfit. He had on a muscle shirt and a pair of shorts. Both black. Nothing really unusual there.

"So, what are we going to be doing today?" Izuku asked.

One took a sip from his chocolate shake before rubbing his chin thinking.

"I suppose we can start off by seeing just how strong you are right now and make progress reports on a weekly basis. I'll also see just how well you can defend yourself already. Oh, and I'm also putting you on a diet. No dirty bulking. Only I'm allowed to do that," One wagged his finger at the end.

Izuku's heart was racing. This guy had some pretty good ideas. Seems like he planned out everything after their initial meeting.

"Now, I actually own this gym so you don't have to worry about membership or anything. Come in whenever you want. My people will treat you well."

Izuku nodded his head listening to every word he had to say. Excitement filled his heart.

"Let's start you off on the bench press. Hey! Leo! Start this kid off on the base."

A decently muscular guy with no other significant features immediately got to work setting up the bench press and making sure there were no weights on it either.

"Let's see how much you can lift Izuku." One spoke smiling softly.

Izuku hopped onto the bench and after a couple instructions on how his form should be, he tried to lift the bar. Sure enough, he did...Then it dropped...On him. He couldn't lift the bar at all. It was far too heavy for him. He heard some snickering and saw One's face. The man seemed a little disappointed and he sighed.

"Alright Izuku. Looks like we'll have to start you off on those rubber band exercises instead. I'll give you a list of exercises to do with those bands later on after getting a gauge for the rest of these exercises. Try the squats."

The Leo guy from before arranged the bench in a way where the bench was no longer there and the bar was raised higher. Some instructions later and Izuku actually managed to squat the bar.

"Good. At least you can do a squat with the bar. We're going to increase the weights until we see your absolute limit."

"Sounds good to me!" Izuku chirped.

The weight was increased by 20 pounds. Then 50 pounds. He struggled at the 70 mark. That's where they stopped. One clapped at Izuku's performance.

"Alright Izuku! Good job! Color me impressed. Seems like you didn't skip out on leg day. You just did 115 pounds! For a beginner, that's great!"

"Th-Thanks Sensei."

He wasn't used to compliments.

"Now, time for deadlifts."

Izuku froze. He didn't like the sound of that.

This was by far the exercise he hated the most due to the highly specific form he had to take and just how awkward he felt throughout it all. He surprised himself and managed to deadlift 95 pounds. He felt proud of himself.

"Your performance was pretty good for a beginner. For a minute, I thought you wouldn't be able to perform at all after the whole bench press thing."

Izuku couldn't disagree with his thought process there. He almost died on the bench press back there. Thank goodness there were actually people to save him back there.

"What's next on the agenda?" Izuku inquired.

"Well, I did say we'd see just how well you could defend yourself in a fight, so get in the ring and pick up a weapon of your choice."

The ring was actually an octagon and Izuku didn't know what to expect here. Pick a weapon of your choice? What did One mean by that? He looked around and found a pair of boxing gloves. OK? Was there anything else? Izuku looked around some more and found a bo-stick and...that was it. Well, he didn't know how to wield a bo-stick so boxing gloves it was.

As soon as Izuku put on the gloves, he noticed someone else get into the ring as well. This person didn't appear to be all that strong. Very slim like a long-distance runner. They were also wearing a pair of boxing gloves. He had a wild look in his eyes that unnerved Izuku. As soon as he heard a bell ring, his eyes widened. There was a bell?

Before Izuku had any time to actually process everything, the guy launched himself at Izuku with an uppercut. Then a jab. A kick to Izuku's hip. Several hits were being brought down on Izuku and he couldn't even process all of them. All he could process was the pain he was feeling. The first couple of attacks didn't hurt too bad, but the onslaught of attacks just began to increase the pain over time. Izuku honestly wanted to cry right now but he sucked it up this time around. It was time for him to grow up. He couldn't continue crying like a little kid anymore. Besides, he's experienced far worse from Bakugou and his goons.

Bakugou...Bakugou. That guy. Izuku had a Quirk now. He could actually defend himself now. He smiled devilishly. He had a Quirk now. No longer could Bakugou call him Deku! He could become strong now! He needed to learn how to use it properly and this was as good a time to learn it now!

Izuku could feel his body begin to tighten up. His breathing began to become more rapid. So much energy passing through his body right now. He needed to focus it somewhere. Somewhere like his arm? His fist?

Yeah. He was going to try focusing it into that one specific area. He tried immensely hard to channel all that energy there like he did the other day. It took a good minute of getting an onslaught of punches and kicks before he heard a bell ring. He guessed it meant the end of one round or something? It made sense honestly. Thank goodness for that too. Now, with the breathing time given to him, he could have a chance to actually focus his new given power. It took him the whole rest period. About a minute.

Izuku felt a bit more confident this time around and as soon as the fighter jumped at Izuku, he uppercut the man...It sent him flying back. Izuku was heavily surprised at just how strong his punch was. He felt a sharp jolt of pain suddenly arise though. He looked down to find that his arm was completely battered unfortunately. The pain was unbearable.

He clutched his arm in pain as he screamed. He couldn't even bother to stand getting down on one knee trying to breathe. Trying to force himself to not focus so much on the pain he was feeling right now.

"You did great Izuku. Now we need for you to learn how to control that power better. That's where the vigilante work comes in." One whispered before Izuku passed out from the pain.

A/N: Yeah. I know. Short chapter after all this long wait and the Quirk seems similar to One For All right now, but you'll see the differences in display in later chapters. Give me Quirks for villains and thugs or people in general for Izuku to fend off against. The ones I find most interesting I'll use. Sorry again about the short chapter. This was the best way I figured I could finish it. Oh, and one more thing...Give me recommendations for Deku's training. Certain exercises and all that which would be beneficial to Deku's development.