My name is Hizuku Midoriya, Hero name Fireblitz. I was born with a Quirk called Pyromancy, a fusion of my father and mother's abilities that allows me to emit flames from my mouth and control them with my hands.

In kindergarten I met the one who would become the most important person in my life, Katsumi Bakugou. Together we became rivals, then friends, then more. After we married, she revealed me the secret of her and her friends' power, One for All, and I became one of the few people in this world that know about it.

Then we had our daughter Itsumi, and I opened my own agency after years as Endeavor's sidekick. Katsumi rose to the top of Hero Society, while I helped her deal with the stress of being one of All for One's sworn enemies. I love her deeply, and I love my daughter even more.

I'm Fireblitz, a Hero that wants nothing more than to protect his family.

And there is nothing else I would rather be.

Izuku looked at his older self's costume with keen interest when he entered the office they had all followed Itsumi towards when they had left the gym. The man wore a simple jumpsuit, colored in bright red and white following patterns that reminded Izuku of All Might's Silver Age's costume, although the main difference were the two large white flame outlines on the two sides and the lack of a cape. His pauldrons were reminiscent of Endeavor's own. It included no gloves and forearms, and Deku noticed numerous scars and what looked like the results of heavy burns.

"Sorry to keep you waiting." He said, sitting down. Katsumi, who in contrast was not wearing her Hero Costume, stepped next to him. "Well, I suppose we should introduce each other. My name is Hizuku Midoriya, this is my wife, Katsumi Bakugou, and the one over there is Itsumi Midoriya, our daughter."

"I'm Izuku Midoriya." Izuku quickly replied, and he noticed an interested look on Hizuku's face. He could understand why since he was feeling the same. They were supposed to be the same person, just coming from different lives in different environments.

"Man, he looks exactly like you did in high school, Hizuku." Katsumi commented. Izuku lowered his eyes and she chuckled "Although he seems less bold."

"I'm Shoto Todoroki, this is Mashirao Ojiro." Todoroki continued ignoring her interruption, pointing to himself and Ojiro. Izuku looked at him and noticed his eyes were not moving from Hizuku for the entire time, and where showing more than a hint of disgust.

"I see. That's why, except for the Tail, you look the same as Ojiro did at your age." Hizuku said, looking at the blonde man, who just nodded. Deku observed him and noticed that, while not as outright hostile in his expression, there was something that showed how uncomfortable Ojiro was with facing Fireblitz.

"With all due respect," Todoroki said, saying the word respect like it had to be physically pulled out of his mouth "I'd like to talk about the situation. Since you seem to know everything…"

"Now, let's not get over ourselves, we don't know anything more than what we were told the last time this happened. It's a lot, but I can't guarantee it will be enough to satisfy you." Hizuku replied.

"I'll take the risk. So, let's start. How do you know about the situation?"

It was Katsumi who responded with a smile "Because we already met someone else that traveled here from another universe."

"What?! When?!" Izuku asked.

Katsumi started to explain.

-

It was a normal night for Katsumi Bakugou. Well, as normal as a night could be for a Hero on her free night. Her husband was out for his night patrol, and her four-years old daughter was already in bed. Which meant she had the house free and she could dedicate herself fully to her favorite hobby.

"Break his fucking spine!" She shouted at the TV screen, smiling widely at the QMMA match she was watching from a comfortable position on the sofa.

Quirked Mixed Martial Arts was a rather new sport, only starting to officially hold matches a mere ten years before, when the use of Quirks in dedicated sports had been de-penalized, but she had loved it since she had seen her very first match. The current World Champion, Rappa, was a reformed Japanese Villain that had become the face of the whole sport. She couldn't say she liked an ex-villain of all people was swimming in money, but at least he had given QMMA a boost in fame, so at least she was thankful for that.

It also helped the current match was between a nobody – well, some American Hero, but whatever – and an old classmate.

"And Tentacole goes for his famous Consecutive Chokes. Max Power seems to be unable to free himself from the grips!" The announcer shouted, and she cheered once more. After graduating, Shoji had opened his own Hero Agency. However, he had been scouted and since then had been splitting his life between Hero work and QMMA. Katsumi really wished she could do the same, but female QMMA was not nearly as big, and she could have schooled most of the fighters effortlessly. That was a downside of having a portion of One for All, she supposed.

She was so taken by the match she took a while to register that her doorbell was ringing. She gritted her teeth. Shoji was doing well, so he would probably win, but she would have liked to see it. Still, she probably was cheering so loudly she couldn't just pretend to not be home.

She stood up, cursing under her breath, and opened the door, doing her best impression of an angered rottweiler. She stopped when she found a person looking directly at her. Tall, impressively muscular, with hood and a cape covering most of his body, she was eerily reminded of Muscular, back from her first year summer camp in UA.

"Hello." He said with a cheerful smile of white, clean teeth, a thick American accent under the Japanese "Is this the house of the holder of One for All?" He asked.

Katsumi responded unleashing an explosion in his face.

-x-

Hizuku shook his head "Your first meeting with a man from another universe, and you blasted him in the face with a One for All powered Explosion."

"What was I supposed to do?! The only people that should have known about One for All were some of our friends, All Might's friends, you and the followers of All for One, and he wasn't any of the first three!" Katsumi replied angrily.

"I'm not saying Isaac wasn't an idiot in how he asked, I'm saying you could have handled it better."

Todoroki coughed softly "Sorry to interrupt, but can we continue?"

"Oh, of course." Katsumi replied.

-

The man was sent flying backwards. Usually, Katsumi would have followed with a second attack, but then she realized that he was still flying. That was also when she started feeling something. Her One for All, a third of the power once wielded by All Might, was restless. She felt surprise and… elation?

"Woah there." He replied with a large smile, and she realized he was not flying, more like floating in midair "I'm not a villain, sorry if I startled you."

"Startled? That's an understatement. Who are you?"

He removed the hood, and she dropped her arms in surprise. "What?"

Green messy hair kept in a short airline. Freckles covering his face, though they were barely visible on the sunburnt skin. A large smile, and a shaved face. She was looking at her own husband, though the glaring difference was of course the jagged scar over his forehead, that looked like some sort of claw mark. "Hizuku?"

"Almost! My name is Isaac Midoriya. Well, I was born Izuku, but I thought that when I took my US citizenship, I should have probably taken a more American-sounding name, so…"

"Wait, what are you talking about? Isaac? Who are you?"

The man chuckled "Tell me, have you ever heard of multiverse theory?"

-x-

"And that's how I first met a man from another universe." Katsumi explained.

"Wait, that's Uncle Isaac?" Itsumi replied, her jaw dropping "You told me he was dad's cousin from the US!"

"You were four, Itsumi." She explained with a smile "We didn't want you to know about One for All at the time, since we were not planning on passing it to you."

"Still, why did you believe him?" Ojiro asked.

"Because of the resonance. One for All recognizes itself when two of them meet. According to Isaac, is like the feeling of danger the user feels when All for One awakens his full power."

"Yes." Deku replied, and both Todoroki and Ojiro stared at him "I have already had the experience." Izuku nodded. "All for Deku was different, but now I get the feeling I got meeting you and Itsumi. It's like One for All is happy to know there are others out there."

"All for… What?"

"In the universe I visited before this one…" Deku took a deep breath "Izuku Midoriya was All for One's heir, and then stole One for All."

Deku had of course expected a reaction from everyone. But if Itsumi and Hizuku seemed simply horrified at the implication, he noticed a look of pure terror on Katsumi's face, before the woman managed to put back under control her own feelings. "That's… I don't know what to say."

"Trust me, we have a lot to say about it." Ojiro replied. "But to sum it up, it's a shithole where most people have to either bow to All for Deku's rule or fight and be hunted."

"We chose to fight." Todoroki clarified "Some of us, like Mashirao, paid a steeper price."

Ojiro nodded, and Hizuku shook his head "I'm… I'm sorry for this."

"Izu said the same, but we don't want your apology. You weren't the ones that did this."

Katsumi had been deep in thought for a while now, before she asked a question that surprised Izuku. "Did your One for All include Teleport?"

"Yes." Todoroki answered. "Why?"

"Was another Quirk inside it called Guide?"

"Not that I can remember." He said, and she seemed somewhat relieved, before the man just coughed "Seriously, can we continue? I'd like to know where this goes."

"Fine, fine."

-x-

Isaac and Katsumi were sitting in the kitchen, awkwardly looking at each other over the tea the woman had quickly put together. "So… You are Hizuku from another universe, right?"

"Correct." Isaac replied. He scratched the back of his neck. "I met All Might on I-Island when I was twelve, and from there things spiraled."

"Wait, twelve? All Might did not choose a successor until Hizuku was fifteen."

"Well that's the thing with the Multiverse." Isaac replied, taking a sip from his teacup "There is some common element that seems to carry on from world to world, but there are not many that are the same. Ever heard the nickname Deku?"

"Nope." Katsumi replied.

"Neither have I. Yet a good number of other universes have people calling me that."

"That's pretty harsh. Who would come up with such a mean-spirited name for a kid and it was me wasn't it?"

"Yep." The American hero replied, "I should probably say it was Katsuki Bakugou, most of the time at least."

"Wait, am I a male in some universes?"

"So far the ratio seems to be ten where you are male every one where you are a woman." He replied "But to be fair, I haven't really gone that far in exploring the Multiverse since I figured out how to move through it. Maybe I was just unlucky."

"I see." She said, "So, can we focus on the elephant in the room and talk about the fact you can jump through universes?"

"You could too. It depends what Quirks you have in your One for All." He replied. "There is a perfect combination, which is Teleport and Guide. Ever heard of one of those?"

"We have Guide." Katsumi replied, "Not Teleport. At least I don't, but Eirin, Hakyu and All Might never mentioned it either."

"Right, this is a universe where you can share One for All. That's so mind blowing." The American Midoriya commented.

-x-

"It really is. How does that work?" Izuku asked, interrupting Katsumi's story. He heard Todoroki groan loudly from his side.

"We can give away a selected portion of One for All to someone else. The limitation is that you can only split it in as many parts as predecessors it contains. For example, I currently have the strength of three predecessors, plus my own, so I can split it in four and give it away to someone else. If I do that, that person also acquires whatever Quirk is related to that predecessor, along with his strength."

"Oh. So that's how Itsumi got her portion."

"Yes. Anyway, Isaac then explained he had two Quirks that allowed him to move through the Multiverse. One was Teleport, that supercharged by One for All allows to move from one universe to another. The other is Guide."

"Guide?"

"The Quirk of his second User. It allows someone to have a rough idea of the best route to a place they have been to before, but combined with Teleport, you can use it to go wherever you have been before in the Multiverse."

"I see. So that's why he could move around flawlessly?"

"Well, let's not exaggerate. Combining the two Quirks strained him a lot, he would usually spend a week between jumps if he wanted to go in a specific direction. I assume that isn't what you have been doing."

"No I… I don't think I have Guide."

"That's an issue then." Katsumi replied "He said he had met another One for All user that could make do with just Teleport, but doing that required them months of training, and until then they were stuck jumping randomly between worlds."

"In short, our choice is either for the kid to learn how to use Teleport in months of training, or jump randomly until we find someone with the right combination and willing to help us." Todoroki snorted "Sure, easy."

"Right…" Izuku sighed "But we don't really have another option."

"They could just give it to us." Todoroki replied.

"What do you mean Shoto?" Ojiro asked.

"They can give away a fragment of One for All, can't they? Then she can just give Izuku the piece with Guide, and he'll be able to take us home. From the way you describe it, it's hardly a terrible loss for you."

Katsumi shook her head "If it was me, or Eirin, or Hakyu, it might be a possibility, but Guide…"

"Guide is my Quirk." Itsumi interjected "Or well, is my second Quirk. The Quirk that allowed me to try and become a Hero."

"What?"

"Itsumi was born with a dangerous mix of my Pyromancy and Katsumi's Explosion. Guide is what keeps her own power in control. Without it, she could accidentally hurt herself or others when she uses it. She… She couldn't be a Hero." Hizuku replied, a sad look in his eyes "That's why we can't help you."

"What, because your daughter's future is more important than all of us finding a way back?" Todoroki asked. Ojiro looked at him with surprised, Izuku with disbelief, and Katsumi just with rage. But before she could respond, someone else did.

"Yes." Hizuku Midoriya replied without a hint of hesitation "My daughter and her happiness are more important than anything. Anyone. We will gladly give you a place to stay until you decide to leave. You look like you have had a rough life, and I can smell Izuku from over here. But we can't do more than that."

Todoroki stared at him, his eyes locked with the Flame Hero. For a long, tense second, no one said anything, before Ojiro jumped in with a nervous smile. "Alright, thank you very much. We definitely want to know more about this Isaac, and we do need a place to sleep, so we will accept. Right, Shoto?" He asked nervously.

Shoto waited another second to respond, before slowly nodding "Yes. I think that would be for the best. I'm sorry for offending you."

Izuku nodded as well. "Thank you."

Hizuku smiled "Think nothing of it, Deku." He said, before putting a hand over his mouth "Was that offensive? Itsumi said that's the name you gave her and…"

"No, no, Deku is my Hero name." Izuku replied with an awkward smile "It's… complicated."

Hizuku chuckled "I'm sure there is a good story behind. Now, I have some meetings today. Katsumi, since you are going home, think you can take them there?"

"Sure darling." She said with a smile. Izuku felt the need to blush, despite knowing it made no sense. He wondered if Ojiro had noticed until he heard him chuckle. Oh, he had definitely noticed "Come on, you three really need a shower. Itsumi, stay, you should go back to your job. I think Shiro is coming here to start the Internship later today."

Itsumi nodded, but Izuku noticed her staring at him as they left. He waved at her with what he hoped came across as a reassuring smile before leaving, but he noticed she seemed deep in thought.

-x-

The drive with Katsumi Bakugou started with something Izuku had not expected: an apology.

"I'm sorry." She said, "I know we must sound like selfish parents. But Itsumi… She always wanted to be a Hero, but the Quirk she was born with almost blew away her entire arm when it first awoke, and she never got better. It's not lack of control, it's the power output. I guess that's the disadvantage with having two parents with strong Quirk. She needs Guide."

Izuku looked at Todoroki, who for his part was just tapping the windshield, deep in thought. "You can't just give her something else, right?"

"No, aside from the fact that people believe her Quirk is genuine and would notice the change, there just aren't any other Quirks that would help her control her power. Not to mention, I already got in trouble with Eirin and Hakyu for giving away a portion of it without telling them. It's supposed to be a choice we make together, as One for All's successors. I can't imagine what they would say if we gave it to someone from another universe without their approval."

"Maybe we could give it back once we… No, it wouldn't work. Even if I came back here, my One for All can't be split, and even if somehow it could I would end up stuck here again." Izuku said, thinking out loud rather than talking to anyone. "If there is a way to learn how to control Teleport, I can make it eventually, but the issue is what the method is. Maybe it's the distance? The issue is that testing it in any way means taking a leap of faith."

"Wow, so the tendency to babble is multiversal." Katsumi commented, and Deku yelped.

"I was…"

"Yes. I remember when Hizuku used to do it. He stopped when he was in his twenties, but it's kinda cute to see it again." She commented with a smirk. Izuku blushed before turning away. "Ahahah, don't worry, it's really fine. I kinda miss it at times."

The car continued through Kamino Ward, making its way south, until they reached Jomonu Ward. Here, Katsumi opened a gate surrounded by a tall wall. Behind it was a large house with a well-kept garden. It reminded Izuku of the Todoroki household, though the house itself was more western styled. They made their way inside, and Katsumi had to stop Todoroki and Ojiro from walking in with shoes.

"What?" Ojiro asked, looking confused.

"That's how it works here."

"True, it's the same where I come from." Izuku said, removing his metal shoes "So it wasn't like this back in yours?"

"I think my grandparents used to do it, now that I think about it." Ojiro replied "But I never did. And anyway, when All for Deku took over, I didn't exactly have the luxury to take the shoes off every time I entered a hideout."

"Same." Todoroki said "But if it's how it works here…" He took out both shoes and put them next to Izuku's, followed by Ojiro. Izuku stared at them curiously. "What?" Todoroki asked, accepting a pair of slippers from Katsumi.

"Nothing, I was just thinking, sometimes it's easy to forget we come from different universes."

"We speak the same language and have a similar history, of course it's weird." Ojiro commented as they walked into the house, following Katsumi upstairs to their rooms "Though you are a walking reminder of the fact that I have to deal with the existence of more All for One out there."

"And more One for All. Focus on that." Todoroki replied, "We have a chance here."

"Yeah, Izu said he'd help us, and we can also hope to find more users willing to help out there. Imagine All for Deku's face when some versions of him will come and punch him in the face."

Todoroki grinned "Yeah, that would be fun." He answered, before glancing at Izuku.

"I really wish we could help…" Katsumi said, before stopping in the middle of a corridor on the second floor "Well, here it is." She continued, gesturing at the rooms to her left. "The guests rooms are over there, just pick the ones you like. Feel free to go take a walk if you want but remember I don't really have a spare key for you three, so don't come back too late."

The three nodded, and Deku bowed his head "Thank you."

"Again, don't mention it. One for All holders have to help each other, that was All Might's final lesson to us." She said, a sad smile on her face "Well, see you. If you want food, there is some in the kitchen. If you need clothes, just take some from Hizuku, he won't mind. He should still have some that would fit you. Watch what you want in tv, I suggest Channel 230, it's where they show QMMA matches. If you want to train, there is a small gym upstairs."

Izuku and Ojiro nodded. That was when they realized Todoroki was already in the bathroom. "Oh man, I wanted to go first." Ojiro commented with a sigh "Oh well, I'll go find a room I guess." He added, leaving. Izuku looked up at Katsumi.

"Uhm, so… One for All users, uh?" He awkwardly said. He mentally slapped himself.

"Yeah. So, how many generations do you have?"

"I'm the Ninth."

"Oh, that's cool. I guess I would count as the ninth as well? It's a bit complicated when there are multiple lines. Even All Might wasn't sure on how to count them."

"Can I ask a question?" Izuku replied. She looked at him surprised, then nodded gently "When you defeated the last All for One user, how… how many…"

"How many people died?" She completed, and Izuku nodded.

"A lot. Alien King was dangerous, and many of us had to pay the price." She rolled her t-shirt up a bit, showing him her left flank. It had a large portion that looked half-burnt and half-discolored. She quickly unrolled it "Judging by your friends, fighting All for Deku has cost them a lot as well. But remember, there is nothing set in stone. That was one of the thing Isaac told us. For better or for worse, we have to accept that what happened was the result of our own decisions and move forward. So, when the time comes," she looked at him straight in the eyes "Do your best. Whether you win or lose, no one will fault you if you put everything you have in this fight."

Izuku nodded, and she walked away, leaving him alone to think.

-x-

The rest of the day went about as well as Izuku could hope given the situation. The three washed themselves and their clothes, took some of Hizuku's clothes – as Katsumi had said, he still had older ones that fit Izuku well - ate some food in the kitchen and rested, something all three were most grateful for. They were joined back by Hizuku and Itsumi later that evening, but Izuku noticed Itsumi was avoiding them. At dinner, Katsumi came back home as well, and they ate together.

The dinner started a bit awkward, with no one really speaking beyond some small talk on the quality of the food. The first to break the ice was, to Izuku's relief, Katsumi.

"So, I know this is very difficult, but… Can you tell us a bit about your worlds?"

Izuku looked at Todoroki, who was just absentmindedly staring at the food, while he noticed Ojiro had done the same. "There isn't a lot to say." Todoroki explained "All for Deku has taken over years ago and has been holding onto his power since. We Heroes are broken up in different groups, basically doing Vigilantism and trying to come up with a way to break his control over Japan."

"So, you are part of a group?" She asked.

"We were." Ojiro replied "The Imprisoners. I know, the name was a bit cheesy, but half of our group was about capturing you with either tape, sticky balls or ice."

"So Sero, Mineta and Todoroki were in it too, uh?" Hizuku said "Who else?"

"Well, me, Hagakure and…" He sighed "Yeah, can we talk about something else? It's a bit hard to talk about it."

"Oh, sorry…" Katsumi replied, before looking at Izuku. She was almost pleading him to lead the conversation in another direction.

"Oh, in my universe I'm at UA." He explained "Still training."

"Who are you doing the internship with?" Hizuku asked "I went to Endeavor's after my first sport festival."

"Yes, and soon after you started dating Shouko. Going right for the boss' daughter, uh?" Katsumi casually asked. Izuku froze in place. Todoroki, he could tell from the cold even without looking down, had literally frozen half of his chair. As for Ojiro, he had taken a colossal spit take and was now apologizing while cleaning the table and laughing audibly.

"Come on, it didn't last long." Hizuku said defensively "And to be honest you shouldn't have brought it up with them here."

"Oh shit, you are right!" She said, but Izuku noticed that there was a smile on her face as she looked in Todoroki's direction, before she quickly put it under control and turned to a more neutral expression, apologizing.

"It's not a problem." Izuku said quickly, though he was pretty sure the apology was for Todoroki. Ojiro seemed as amused as she was at this point "But I'm at Endeavor's agency too. Well, I was at Sir Nighteye's agency first, but… Well, he passed away after a Villain fight."

"Oh." Hizuku quietly replied "I'm sorry."

"Seems tonight we are both really good at choosing bad arguments, uh?" Katsumi asked, clearly trying to lift the mood "Wait, tell me about the sport festival. It couldn't have gone bad, right?"

"Oh no, actually it was really fun." He said. He chose to not mention what happened with Iida, after all it had nothing to do with the Festival itself.

"Who won?" Ojiro asked.

"Well, Kacchan… I mean, Bakugo got first place."

"AH!" Katsumi shouted, "In your face, Hizu! Two to one!"

"Wasn't you, doesn't count." He just replied taking a sip from his glass. Izuku clearly noticed his amused expression.

"Todoroki won our first-year tournament." Ojiro added. Shoto just nodded.

The rest of the night went on like that, with the five of them trying to piece together a conversation while avoiding the more difficult topics. It was mostly Katsumi and Ojiro asking questions and the other three answering, although Shoto was by far the least talkative. It was only at the end of the dinner that Izuku noticed Itsumi had not spoken once. In fact, she had left the table the moment she was done eating, saying she had to go to the bathroom and never coming back. Izuku wondered if she was offended by the fact they had lied to her. 'I'll ask her tomorrow.' He thought, right before going to bed and immediately falling asleep.

-x-

He woke up in the middle of the night, with a groan. He had not really understood why Todoroki had taken a room so far from theirs, until he heard Ojiro snore. Somehow, it was strong enough it had managed to wake him up from the room over. With another groan, wondering how he had slept in the same car as the man, he stood up and decided to go to the kitchen, to drink some water before trying to sleep again. Otherwise he was going to try to sleep on the couch.

Izuku walked downstairs and was surprised to see the light in the kitchen was on. A glance at a clock told him it was two AM, which seemed an odd hour for anyone else to be up.

Once he was closer, he started to hear the voices. It was Itsumi, Hizuku and Katsumi, whispering. He was about to reveal himself when Itsumi raised her voice enough he could hear her.

"But why did you have to lie to them?!" She asked, her voice angry.

He froze.