Disclaimer I do not own My Hero Academia.
It was Saturday night and Izumi was doing what she normally did at this time and that was people watch at the mall. She had her notebook out and was drawing the people she thought looked interesting, occasionally she would use her quirk to try and figure out their quirks. Right now, she was focused on the custodian sweeping up trash. His skin was grey, and he had a prehensile tail that he was using to hold the dustpan as he swept. She liked mutant type quirks, they were never what they seemed and they gave off neutral energy, they helped her feel relaxed compared to active which made her feel like she was on a sugar high. Izumi felt a familiar quirk and looked to see if it was who she thought it was. She smiled to herself when she saw Shinsho, She waved at him but he gave no indication that he had seen her, they had never spoken before anyway and the one time they did several people started harassing him and calling him a villein. So far all she knew about him is that he had brainwashing as a quirk, he had trouble sleeping, he liked drinking several cups of coffee which didn't help his sleeping problem, and he was being bullied for his quirk but his dream was to be a hero to prove everyone wrong, also she thought he was really hot. She decided against talking to him because her quirk would only hurt him.
"Not like I can be close to anyone ever" mumbled Izumi.
Izumi went back to her notebook when she felt a new quirk enter her area of influence. Normally she wouldn't care until the person was in her line of sight but this quirk was strange, it gave off active, neutral and inactive energy which shouldn't have been possible. The more she tried to understand the less she was able to figure out as the quirk which began to feel like multiple quirks sensed her and closed its self to her, she had encountered sentient quirks before and the had done the same thing but they always gave off either active or neutral energy never both and never inactive. Izumi scanned the room the room looking for her mystery quirk when she noticed a skeletal blond haired man in baggy clothes moving throw the crowd with a cup of tea heading for the open space near Izumi. Izumi tensed expecting screams but instead only a sigh of relief as the very clearly tired man sat down. He noticed her staring.
"Oh I'm sorry is this seat taken?" asked the man starting to get up.
"No your fine, no one was sitting there, don't get up you look like you need a seat, you just startled me is all" said Izumi.
"Oh then I'm sorry for doing that, nice to meet you I'm Toshinori Yagi" said the man.
"I'm Midoriya Izumi, it's nice to meet you sir, may I ask you a question, it's about your quirk or lack of?" asked Izumi.
Toshinori was caught off by that question and would have been on high alert if it weren't for the obvious confusion on her face.
"Oh it's just a body enhancing quirk" said Toshinori trying to throw her off.
From the look on her face it was clear she didn't believe and that concerned him, his fear that All for One wasn't gone resurfaced.
"Um let me explain, my quirk is called quirk vampire, I feed on the energy produced by quirks, and everyone produces different forms, that lady serving coffee has vanilla perfume quirk, she always smells like vanilla and thus produces neutral energy, the custodian over there is a mutant type and also produces neutral energy, that older man has a quirk that flavors things like chocolate, when in use it produces active energy, when not in use, it's neutral again, then there are quirkless people, they don't have a quirk but they do have a quirk gene which produces inactive energy, the thing is you produce all three...how is that possible?" asked Izumi.
Toshinori now understood her confusion, having a quirk like that and then encountering him would probably confuse anyone. No one but those close to him knew his civilian identity, everyone else only knew he was All Might when he was in action and maybe telling this stranger a story would satisfy her curiosity. He knew the one he wanted to tell and it was the real history of him no longer being quirkless.
"Would you like to hear a story?" asked Toshinori.
"A story?" asked Izumi confused.
"A story mostly unknown by history" said Toshinori.
"Sure" said Izumi intrigued.
Izumi had asked him a question and he answered with one of his own about a story, she wondered if this story would answer her question.
"Long ago there were two brothers, the youngest was born quirkless but the oldest was not, the oldest had a quirk that could steal other quirks and it became known as All for One, he took that as his name as well, he made followers by taking from those who didn't want them and gaining new followers by giving them ones, of course he would keep the ones he deemed most useful for himself, he wanted to control the world but his little brother thought him evil and tried to stop him, believing that his brother needed a quirk for his loyalty so he gave him a stockpiling quirk which merged with his quirk the ability to transfer quirks, together they merged and became One for All, he passed that quirk onto a another person who also passed it on, until it reached the 8th, along the way stockpiling their memories and quirks, the 8th has only ever figured how to use one of them and that's all he needed until the day it wasn't enough, the 8th fatally wounded All for One but was himself critically injured by All for One, the 8th has began to notice his power waning and those closest to him have been advising he pick a ninth but the 8 doesn't want to leave the world unprepared should his greatest fear be true" explained Toshinori.
"The 8th is being selfish" said Izumi.
Toshinori was caught off guard by that statement.
"How so?" asked Toshinori.
"Well if the power is waning then it's working double time to pick up slack in other areas, you said the 8th was injured, if they are severe enough then using his quirk for hero stuff is draining the quirk faster as it works to keep him alive, if the 8th dies before a 9th is chosen then the world will be unprepared if his fear is true" explained Izumi.
"She's right" thought Toshinori.
"What kind of injuries, you said critical" asked Izumi.
"Oh uh the 8th lost his stomach and a lung, extensive surgeries left him with multiple scares and he can only use his power 3 hours a day" said Toshinori.
Izumi looked at him bewildered.
"What?" asked Toshinori.
"You should be dead" said Izumi surprised.
Toshinori started laughing then started coughing blood.
"I never said I was the 8th" said Toshinori wiping away the blood.
"Context clues, Clue 1 you tell me a story about two very old quirks, 2 you give off inactive energy because you were quirkless before becoming the 8th, 3 your coughing up blood" stated Izumi.
Toshinori smiled.
"You got me there" said Toshinori.
"Also based off your appearance, I would say you're an underground hero with either a body enhancing quirk, a self-preservation quirk or both, which is how your power is able to limit usage" pondered Izumi.
"Kinetic enhancing super strength that gets stockpiled, it's the only one I've been able to use and so far it's all I needed" said Toshinori.
Izumi looked at him clearly thinking something over.
"Have you done any research on the other users?" asked Izumi.
"No, my master had float but I haven't figured out how to use it, but I'm able to 100% of my strength, my master wasn't able to" explained Toshinori.
"Because you're an idiot" said Izumi.
"What?" asked Toshinori surprised.
He looked at her and saw that she was trying not to laugh.
"You were told the origins of One for All and instead of doing any research whatsoever you decided punching really hard was all you needed, there are a ton of hero's who have enhanced strength as a base of their quirk, heck a lot of villeins have figured out how to outmaneuver that since it's so basic" said Izumi.
Never before had Toshinori felt so insulted by a stranger, of course he knew she was right as she was basically repeating what Gran Torino had once said.
"Maybe she'll think I'm less stupid if I tell her I'm All Might" thought Toshinori.
He turned to look at her when he saw her staring at her glove. She slowly pulled it off reveling pale white skin that had rarely seen the sun.
"Toshinori there are about 407 people in my area of influence, I can pull the excess quirk energy in and possibly heal you, I don't know if it will work on injuries that old but I do know it will dull the pain" explained Izumi.
Toshinori was surprised by this offer and he had to think about it.
"Will anyone get hurt?" asked Toshinori.
"Older people and younger children might feel tired after but a snack or sitting down will help them, I can't use my own quirk energy and won't be able to use yours as healing you prevents that, also I can't heal this again unless it becomes a new injury, when my hand touches your skin, you might feel a pinch or even a burning sensation" responded Izumi.
"Ok" said Toshinori.
He lifted up his shirt and saw her flinch at the sight of his scars. She touched her hand to his chest, he felt a pinch and she felt an endless ocean of stored quirk energy. As she began drawing in energy from the people around her it was now closed off to her. Toshinori began to feel heat pour into his body and felt the sweat drip down his back, he saw the sweat on her forehead as well. After what felt like forever but was actually 20 minutes she stopped.
"I can't do anything more, I think I hit a time limit on what I can do" said Izumi.
"Thank you for trying" said Toshinori.
"Your welcome...oh I need to go, have a nice night" said Izumi.
"You to" said Toshinori.
He watched as girl left and realized he never told her that he was All Might but maybe that was for the best, he also began to wonder how much healing she could do if she had access to One for All, all that stored energy put to a better use then just punching stuff.