My Hero Academia: Blood and Fire

Izuku knew that things could spiral out of control and they had when the train passed through Hosu, where it was attacked by villains, forcing him and Gran Torino to go on the offensive as they lashed out at the enemies that were in front of them and on the streets. He found that it was far too easy for them to get separated from each other, there happened to be that many minor villains, as they seemed to be below the ones who assaulted No 13's area of UA, which provided a chance for him to really put his lessons into action. With that in mind Izuku continued to use Full Cowl as he kicked and punched some of his opponents while using his speed to get around the incoming attacks, allowing him to see that his training with Gran Torino had actually improved his skills greatly. Thanks to his new skills he was able to move through part of the crowd, to help civilians and heroes alike, while at the same time steering clear of his sisters since he felt that they didn't need any assistance from him.

Such a thing caused him to continue through the city, doing whatever he could to help all of the people that were in danger due to the sudden villain attack, where he eventually bounded into an area full of danger, an alley that happened to be the area that the Hero-Killer was working in, allowing him to punch the villain in the jaw.

"Bingo." Izuku remarked, though while he hadn't been focused on the Hero-Killer he knew that he couldn't back away now, hence why he got the wounded hero away from the one called Stain, where he noticed the hero was Native, whose gear resembled a Native American, before spotting Tenya on the ground and that he was landing beside him, "You know, I'm not too surprised by this, since all of the information we have on Stain is that he likes to attack heroes in alleys, often deserted and dead end areas so he can be alone... I really didn't mean to come here, but it seems like I'm butting in again, just like All Might said a true hero should do."

"Really? All Might said that, to you?" Stain inquired, though even then he didn't need those words to know that this boy had the makings of a true hero, as his first instinct was to get him away from the injured and save someone in distress, even if that someone happened to be the false hero known as Native, "Step away, kid, I would rather not sully that light you have with the blood that will flow from the deaths of those two false heroes behind you... one is too focused on his reputation and what he gains from each job, while the kid is too focused on his own vengeance, like a vigilante."

"Sorry, but I suspect that my body would cause me to come back, now that I know you're here." Izuku said, where he looked at Tenya and Native for a moment and understood what was going on when he noticed the cuts on their bodies, which told him that Stain's Quirk likely involved something that caused his targets to become numb, meaning he had to avoid being cut at all costs, all while he mass sent his location to everyone on his contacts, "Shall we get started? I'll lecture my friend later."

Stain paused for a few seconds, the boy seemed like someone who had worked hard to reach this point, he might even be a fan of All Might's enough to get praised by the No 1 hero, a figure Stain had reserved as the one to bring about the end of his life, and yet the boy reminded him of Tomura's Sensei for some odd reason. Since it seemed like they were going to fight for a time Stain drew his blades as a familiar energy pulsed around the boy, he could see the lines on his face for a moment, and in the following moment Izuku rushed him, using the speed of Full Cowl to close the distance. Stain was surprised, the boy seemed to be quite skilled in terms of speed, and yet when he swung his blades down at him the boy surprised him again as he slipped under him, causing him to turn and slash at the area behind him. Such a thing was followed by the boy appearing in the air above him as he punched him in the face once more, sent down at the ground with what he called a 'Detroit Smash', showing Stain that the boy was definitely a fan of All Might's, and yet despite following the attack he found that it did hurt more than he was expecting.

In that moment he remembered where he had learned of the boy, he was the one who fought Endeavor's son and showed a change in style part way through the match, Stain had caught the match before dealing with the Engine boy's brother, and yet he got a small nick in, allowing him to lick a bit of the boy's blood to disable him.

"You know, I've got to say something: you've got talent, Izuku Midoriya. Your rate of growth has been explosive." Stain said, it was true, there was no denying that fact after he had seen the boy in action, especially since the boy had grown to the point that he needed to pick up his own speed and power to keep up with him, "Again, I offer you this chance, with your light and your true hero instinct: leave and become a great hero, I will not stop you once you can move again."

Izuku was going to say 'no', since he knew he couldn't let Stain kill two people in front of him, but the Hero-Killer was stopped by Shoto, of all people, who used his flames to drive the figure back, who was annoyed by the fact that his work had been interrupted by this.

"I realized that there was a reason for everything you did, Izuku, and understood what this was a cry for help. Don't worry, in no time the army of lesser villains will be done in and heroes will be here." Shoto stated, where he focused on Stain, who was now staring at three school students, two strong ones and a weaker one, while at the same time he summoned his ice and sent it after Stain, pushing him back and giving them some room, "I won't let you kill anyone, Hero-Killer."

Sure enough Izuku found that Shoto understood not to let Stain's blades cut him or show their foe blood, even when he sent out flames and ice while making sure to avoid damaging the buildings around them, but as both fought Izuku found that he was able to move once more and bounded up to Stain, punching him away before landing near the others.

"So he takes in blood and that seals the movements of his foes, and I have three conclusions as to why I'm free while both Native and Tenya are still bound." Izuku commented, where he found that Stain paused for a time, like he was listening to what he had to say as he planned his next attack before the group did, though at the same time he had Full Cowl at the ready, "First, there is a limit as to how many targets he can have at any given time and the newer ones, like me, can be freed in no time while the first ones, like Native or Tenya, have to wait minutes before being freed. Second, it has to do with how much blood he's ingested per person, like the more he ingests the longer the effect is, or the less he ingests the shorter the effect it. And third, it has something to do with one's blood type."

"You are definitely a quick study. Blood type is the correct answer." Stain replied, he saw no reason to hide the truth since it had been guessed, especially since he was starting to see the reason why All Might had taken a liking to Izuku, he really had the makings of an intelligent and worthy hero in the future.

Izuku smiled for a moment as he and Shoto attacked Stain, him using the speed of his Full Cowl while Shoto used both of his elements against their foe, causing the Hero-Killer to move between both attacks, which was definitely harder since Izuku's speed was the main thing for him to worry about. Stain wasn't too worried about the ice, he could slice through it since the boy didn't want to ruin anything around him, and the flames were easily to avoid, he wasn't used to wielding this portion of his power, but it was Izuku he was worried about since the boy was definitely the more skilled one. Sure, his attacks were on the lower powered side, but even then they packed quite the punch, that wasn't something he could fake, which made Stain come to terms with the fact that the boy might have been personally trained by All Might as well. There was even the fact that the boy with glasses, Tenya they called him, got back up and rushed him with an attack that shattered his main blades in an instant, their speed and power was just that good, and yet he could see something that pleased him, the light that was in Izuku's eyes was now faintly shining in his friends'.

Normally he would criticize someone and call them out on such a thing, that they were putting on a brave face despite the fact that they couldn't change this quickly, and yet the faint glimmer in Tenya's eyes confirmed that he had reflected on his actions and was now realizing the true path a hero should be walking. Stain then had to continue on the defensive as Izuku went on the offensive once more, where he did his best to keep the boy from landing a definitive strike on him, but it gave the other two openings he had to be careful of. This was especially true when he realized that it was time to get out of here, as the trio were eating up too much of his time and now he had to get new weapons to replace his main weapons, and yet he found that Tenya came rushing up into the air at him, using Shoto's ice as a ramp. At the same time Izuku came down from above with a fist, where the combination of the punch and the kick, and then the followup of a second kick and some flames, was enough to take him out as he collapsed into the ice that was nearby.

With the deed done they removed all of the weapons that were on Stain's body, putting them in a sack they found so they could be turned over as evidence, while also finding a good deal of rope neaby that they used to tie up the Hero-Killer, and once they were done they headed back into the city with Native on Tenya's back.

"And, just as we suspected, you couldn't resist getting in trouble." a voice said, where Izuku found that his sisters caught up with him, though at the same time there were a few others coming their way in the form of Endeavor's group, but Selene and Celestia breathed a sigh of relief as they found that their brother wasn't too banged up, meaning he must have used his Full Cowl the entire time he was fighting.

Selene decided not to say anything as they helped their brother deliver the Hero-Killer to Endeavor, because she knew that the trio that actually fought Stain wouldn't be given any of the credit for their deeds, rather it would all go to Endeavor since he was the first hero on the scene. With that in mind she used Hydra to bind Stain's arms and legs, thus allowing them to keep him contained in case he woke up, while at the same time Celestia carefully looked over the group that had fought the Hero-Killer, where Selene noted that her sister used whatever connection she had to the sun to mend their wounds. She also knew that Izuku, out of all of them, wouldn't care about the fame or credit that came from taking down such a foe, so he was in the clear, but she couldn't say anything about Tenya and Shoto, though in the end she knew they would be taken to the hospital for healing and then questioning. Selene could also see that Endeavor was annoyed by this, letting kids take down the foe he had come here personally to defeat, while also he seemed to be wary of Celestia, making her wonder what the two had talked about previously, but decided that it wasn't worth worrying about.

She focused on the potential side effects that would come from Stain being defeated, especially since Tomura had been the one behind the villain assault on Hosu, which only made her wonder what the future held for her, her siblings, and the rest of hero society.