Fairy King's Return

I have been watching a lot of Nanatsu no Taizai (Seven Deadly Sins) and I have just recently started My Hero Academia as of late. After watching the first couple of episodes of My Hero Academia, I got inspired to write a crossover (sorta) between the two shows. So I did. I also created a challenge and put it on my profile for those who want to try it out. Just a warning, I am using the manga of both series as the basis of the story because it is easier to analyze and put to words to than the anime. It also helps that the manga is further along than the anime.

I am uploading this story with two other stories along with a poll to decide which story I should focus on. So read them all, and choose what you want me to focus on.

Side note, I am putting My Hero Academia about two thousand years after the events of the Seven Deadly Sins.

I do not own My Hero Academia or the Seven Deadly Sins.

Key

"Talking"

"LOUD OUTBURSTS"

*Sound Effects*

"Thoughts/flashbacks"

"Buff All Might Speech"

"BUFF ALL MIGHT SHOUTING"

Chapter Begin

Useless. Worthless. Weak. Those were the thoughts of one Izuku Midoriya as he walked down the empty street in his dirty school uniform. He didn't know what to do now. The words of his hero kept echoing in his head, "You can't become a hero." All his life, Izuku has heard those words. He was a quirkless person in a world filled with people with superpowers. He could ignore the ridicule from his classmates, strangers, and even his teachers, but having his dream denied by his hero, Izuku couldn't just ignore it.

"Maybe All Might is right. Maybe I can't be a hero," He mumbled to himself. "It'll be hard to walk away from my dream, but I can do it. But… do I want to give up being a hero?" Izuku asked no one in particular. Thoughts started rushing through his head, forgotten moments of doubt resurfacing, and every time someone told him he couldn't be a hero Izuku was reliving. He grabbed his head in frustration, shaking it to try and rid himself of his negative thoughts.

"Arrgh, I hate this. I'm tired of everyone looking down on me just because I am quirkless. I hate not being able to do anything. I HATE NOT BEING ABLE TO HELP ANYONE!" Izuku shouted as something snapped inside of him. Power flowed through and around his body.

"AHHHH!" Izuku screamed as he stumbled into an alleyway and fell onto his knees as a shock wave exploded from his body throwing several nearby garbage cans against the walls of the alley. Izuku continued to scream before falling unconscious.

Xxxx Fairy King's Return xxxX

When Izuku woke up, he found himself with his head resting on a table of a dimly lit, old-fashioned tavern. Looking around, he saw a group of people sitting at another table nearby. The group consisted of a short blond haired teenager, short brunette boy holding a green leopard pattern pattern with wings on his back and an iron helm resting above the wings, a skinny brunette man with a mustache, a tall pale blue haired man with a scar on his lower face, a glasses wearing redhead, a taller black haired women, and pig-tailed brunette girl about Izuku height.

"Hey, it looks like our guest woke up," the blond haired boy said as he put down a foamy mug.

"That's great, captain. Now, we can go back to being wasted," the blue haired man drawled out drunkenly.

"You're already drunk, Ban," the brunette boy said floating above the now named Ban.

"When is Ban not drunk?" the pig-tailed girl snarked.

"I can't help it, Diane. Escanor's beer is the best in the world," Ban said.

"Thank you, Ban," the mustached man thanked.

"I believe it would be wise to focus on our guest. He appears to be quite stressed," the redhead stated. Everyone turned to the green haired boy who started sweating under their gazes.

"Of course, where are our manners. I am Merlin, the Boar sin of Gluttony of the Seven Deadly Sins. Welcome to the Boar Hat, our captain's bar," the black haired woman, Merlin greeted.

"I am Gowther, the Goat's sin of Lust. It is a pleasure to meet you," the redhead stated striking a weird pose.

"I'm Escanor, the Lion's sin of Pride," the mustached man said adjusting his glasses.

"Name's Ban. I'm the Fox's sin of Greed," Ban drunkenly slurred.

"Hi there, cutie. I'm Diane, the Serpent's sin of Envy," the pig-tailed girl enthusiastically greeted causing Izuku to blush.

"C-cutie," Izuku stuttered while thinking, "A girl is talking to me and called me cutie!"

"Diane, stop teasing our guest. My name is Harlequin, but you can call me King. It's nice to meet you," the floating boy said as he lazily glided above everyone.

"I'm Meliodas, Dragon's sin of Wrath and Captain of the Seven Deadly Sins," the blond haired boy said.

"I-I'm Izuku M-Midoriya, pleased to meet you," Izuku stuttered out while bowing. "Um not to be rude, but where is here and what am I doing here?" Izuku asked getting a hold on himself.

"I have absolutely no idea," Meliodas said causing everyone (except Merlin) to face fault at his straightforward response. "Merlin, do you have any ideas?"

"I do. You see, young Izuku recently unlocked his magic, but it is extremely flexible," Merlin began to explain shocking Izuku.

"Magic, I have magic! That's impossible, I'm just a quirkless loser…." Before Izuku could say anything else a beam of light hit him in the neck, silencing him.

"What do you mean flexible? I thought magic power was an inherent ability that could be used for offensive, defensive, or supportive abilities," Meliodas asked.

"Normally that would be the case, but it would appear that his magic is searching for a compatible magical power to guide it. We happen to be the most compatible so we were pulled from our places of resting to guide Izuku," Merlin explained.

"How is this possible? Diane, Escanor, the captain and I are dead. We died over a thousand years ago. Ban is taking care of the Fairy King's Forest, and Gowther and you are studying the world. Magic should not be able to bring back the dead this easily," King asked confused.

"While normally that would be the case, Magic has almost entirely disappeared from the world. It is looking for a way to reintroduce itself back into society so it saw fit to find guides for its newest wielder. Almost all of the Magic of the world has been concentrated to the Fairy King's Forest, a few magical creatures, the remaining Sins, and now Izuku. I would say that Izuku holds about ten to twenty percent of the total remaining magic. He has only just awakened the power so he isn't able to draw out his full power as of yet. That is where one of us comes in. Magic has chosen us to guide this young boy, but Izuku can only really learn from one of us so he must choose a mentor," Merlin explained almost in a trance.

Suddenly all eyes turned to Izuku started to sweat under their gazes. "How can I just choose one of you to teach me? I just met you, and I don't know any of your quirks," Izuku shouted.

"Hahaha! Kid, we don't have quirks. Quirks didn't exist when most of us were alive. Haven't you been listening to a word we've been saying. We use magic," Ban teased.

"Perhaps it would be best if I showed you. Download!" Gowther said before putting his right hand on his temple and firing a light arrow into Izuku's head.

Izuku was motionless processing what Gowther just shoved into his brain. While this was happening, King spoke. "What exactly are you showing, Izuku?" He asked.

"Just the basics of our powers, our personalities, and some of our adventures. I used a much more focused version of Broadcast so I was able to show him a large amount of information. Unfortunately, it is years worth of events, so it will take him some time to adjust. When he comes to, he should know enough to choose one of us to teach him. I do not believe he will pick Merlin, Escanor, or myself as a mentor. From what I gathered when I read his mind, our powers would not meet his thought process. He has a great deal of respect for many people and to use our powers would mean to throw away his respect for those people," Gowther explained.

"Such a shame, too. The boy has so much potential, yet he has so many things blocking him from ever reached it; his regrets, his fears, and a complete lack of faith in himself being just a few of them. I would have loved to have him as an apprentice, but I suppose I can settle with teaching him a few tricks to help him along. He would have been a much better one than my previous one," Merlin said slightly unhappily. Before anything else could be discussed, Izuku awoke again.

"Ugh, please never do that again, Gowther," Izuku moaned. "My head feels like Ban after he gets hammered and uses Hunter's Festival."

"You showed him how that felt!" Diane yelled, "Ban drinks multiple day's worth of alcohol in a few hours, and when he uses Hunter's Festival, his body shuts down entirely and he can't even walk! Why would you show him that?!"

"I gathered years of different memories in a few minutes. I have not been able to properly organize all the memories I showed him. I apologize for any unpleasant memories I have showed you," Gowther said blandly.

"It's alright. Now, I know enough to choose who I want to learn from," Izuku reassured.

"Already, don't you want to think it over some more?" Meliodas asked.

"I'm positive in my choice. When I was receiving Gowther's memories, I thought things over and realized something. All of my life, I said that I would become a hero, that I could become a hero despite my lack of quirk, but I have done nothing to actually prepare myself to being a hero. I could have been studying or training to become a hero, but instead I did nothing but hold on to false hope. I ask that King to be my mentor for my sin is the Sin of Sloth!" Izuku proclaimed.

"For real, you choose me! I mean, I am honored to be chosen as your mentor and accept you as my apprentice." As soon as King uttered those words a surge of power escaped Izuku and King. Power flowed from King to Izuku. When the transfer ended, Izuku fell to his knees hugging himself in the process. Two bulges appeared on the back of his jacket before it tore revealing two large, rainbow-colored, butterfly-like fairy wings. King's helm floated over to Izuku before resting right above his wings. A red grizzly bear tattoo appeared over his left ankle.

"Woah, the shrimp turned into a fairy. Did you know this was going to happen, Merlin?" Ban asked suddenly sober.

"No, I just assumed Izuku would gain the ability to use his chosen sin's magical ability. I had no idea he would turn into a fairy. I will have to research this when we get back," Merlin observed causing Izuku to jump into the air and float there.

"This is so cool," Izuku shouted as he flew around the Boar's Hat. He would have continued flying, but his body started to break into particles. "What's happening to me?" Izuku asked the sins noticing that Ban, Merlin, and Gowther were also dissolving.

"It appears that we were all in the realm of the dead this whole time. We are still alive, so our bodies are being rejected from the realm. It was good to see everyone, and it was nice meeting you Izuku. I hope that we can be friends," Gowther said right before he finished dissolving.

"Izuku, when you wake up, you most likely will not have your wings or will be able to use any magical power. Do not be alarmed. This is a spiritual realm, where magic moves much more freely. You need to learn how to access your magic in real life before you can use it. I will be seeing you soon to teach you some how to make some essential items and study you. Goodbye, guinea pig," Merlin said before disappearing leaving the youngest fairy boy a quivering mess.

"I'm going to be scarred for life, aren't I?" Izuku stuttered out.

"Probably, but you will come out the better from it. Merlin is a crazy woman, but she is scary smart so don't diss her help. Anyways, stop by the Fairy King's Forest sometime. It has moved steadily throughout the world, and has just recently settled in Japan. I have King's weapon, Chastiefol, with me, and I'm certain Elaine and Oslo would love to see King's successor. Just call Oslo, and he will take you there," Ban said before disappearing.

"Good luck out there. We'll be rooting for you from the other side," Meliodas said waving good-bye.

"Do your best out there. Good luck," Diane said hugging Izuku tightly.

"I look forward to teaching you, Izuku. When you wake up, keep that helm with you. I will contact you through that," King said.

"Thank you for your everything. I promise to do my best to master my abilities," Izuku said finally disappearing.

"I'm sure you will," King said getting Meliodas and Diane to nod.

Xxxx Fairy King's Return xxxX

"Everything hurts," Izuku groaned as he just got up from the ground.

"Well, what do you expect? You just woke up your magical power, had years of memories transferred directly into your brain, and was turned into a fairy in less than an hour. The fact that you are able to stand at all is astonishing," King said from out of nowhere.

"King, where are you?" Izuku questioned looking around for his new friend and mentor.

"Put on the helmet," King's voice spoke from above him. Izuku hurriedly grabbed the helm and put it on his head. He blinked his eyes a couple of times to get used to it and could see King floating a few feet above him, but he didn't have his pillow with him.

"So this is just like you and Helbram. You'll be here to help me and advise me," Izuku observed.

"I guess so. Anyways, you should head home, while I find an isolated area for you to train. Gowther showed me where you lived, so I will have no problem finding it," King said.

"Why not Dagobah Beach? It's filled with garbage so nobody goes there anymore," Izuku suggested.

"That sounds like the perfect place. Head there tomorrow, and we'll start your training," King said floating towards Izuku's house with Izuku following after him.

The two floated/walked in silence until they came across a crowd of people surrounding a smoking area. Izuku tried to look for a way to see the what was happening before using his small size to sneak to the front. When he got to the front, his heart sunk at the scene in front of him.

It was the sludge villain from before that All Might had saved him from. It covered a familiar figure launching explosions from his palm. "Kaachan!" Izuku shouted realizing what was happening. "How did he get out? All Might caught him!" Izuku wondered looking around at the heroes struggling to get to the front because of the explosions Bakugou was releasing in his struggle. "He must have escaped when I distracted All Might!" He realized seeing Bakugou struggle more and more against the sludge villain.

"Why isn't anyone helping him?" Izuku thought. The heroes weren't doing anything, focusing on blocking the civilians from approaching the struggle. Izuku kept watching the scene in front of him hoping someone would help Bakugou until his eyes met Bakugou's. Izuku saw something he thought he would never see in Katsuki Bakugou's eyes, a plea for help. Immediately, Izuku started running towards Bakugou ignoring everyone who was yelling at him to stop.

"What am I doing? I can't change anything about this. I don't have a quirk and I can't use any magic yet. My legs just moved on their own," Izuku screamed in his mind nearing his sludge covered friend. Without even thinking, he threw his backpack at the villain's eye hitting it and causing the villain to scream out in pain loosening his hold on Bakugou. Capitalizing on this, Izuku started clawing his way through the slime.

"What are you doing here, Deku?" Bakugou asked from his prison.

"I don't know why, but, Kaachan, I couldn't just watch you die," Izuku said through water logged eyes.

In the crowd, All Might's skeletal form suddenly straightened up. He gripped a nearby pole as his body started to expand. "I really should listen to my own advice," he said as he grew to his full height, before jumping over the crowd. "DO NOT FEAR FOR I AM HERE!" He shouted rushing towards the villain at great speeds.

"YOU!" The sludge villain shouted loosening his grip on Bakugou allowing Izuku to pull him out of the villain's grip. "NO!"

"So a Texas Smash was not enough to take you out. Let's see how you handle a DETROIT SMASH!" All Might shouted punching the villain and sending bits of sludge all over the place.

Xxxx Fairy King's Return xxxX

"Man, times sure have changed," King commented as the two of them started heading towards Izuku's home. "In the past, when anyone showed bravery against hopeless odds, they were rewarded for their efforts. Now, it seems that people care more for flashy powers than doing what is right."

"I know that, but I don't care. I just want to help people," Izuku replied looking at his new mentor through his helm.

"There you are my boy!" A deep voice shouted from around the corner. In a cloud of dust, All Might's bulky form appeared skidding to a stop. "I have found you *Cough* at last." His form quickly deflated to reveal his skeletal body.

"All Might! What are you doing here?" Izuku asked.

"I was looking for you, Young Midoriya," the skeletal man said. "You see, I saw so many people, regular and heroes, just standing there, doing nothing to help. But you, the quirkless boy, were the only one willing to help. I saw the look on your face. Your body wouldn't listen despite knowing that you wouldn't make much of a difference, but you did and that boy is safe because of it. If you asked any hero about how they faced a dangerous situations, they all say "my legs just moved on their own." You hold that virtue, the need to help people regardless of how much help you would be. You can be a hero!"

"All Might, thank you!" Izuku shouted bowing deeply.

"None of that, Young Midoriya. I came here to talk to you. I'm sure you're aware, but my quirk is a unique topic of discussion online. There are many different theories, but I shall reveal the truth behind my power. Like the sacred torch, my quirk is transferred from user to user growing in power every time," All Might began to explain striking a dramatic pose.

"But that makes no sense," Izuku said bringing up his helm to cradle his head. "Everyone has their own unique inborn quirk that belongs to only one person…" Izuku began to start unintelligently mumbling much to the amusement of the unseen King and annoyance of All Might.

"That's enough!" All Might finally shouted stopping Izuku. "As I was saying, my quirk has the ability to be passed from person to person, and you, Young Midoriya, are the one who is worthy of inheriting my power!" All Might finally proclaimed.

"What, but I can't inherit your power," Izuku managed to stutter out much to the disbelief of All Might.

"B-but why not? I figured that you would jump at the chance," the skeletal man stuttered in disbelief.

"You would be correct normally, but something changed within me after I met you the first time," Izuku taking the helm off of his head and looking at it intently. "I'm not entirely sure what happened, but something awoke inside of me. Some sort of magic power that I can't explain, but I do know that it changed me. I never will have the potential to use large amounts of physical strength. I'd probably lose to a kitten if I had to fight one physically. So I'm sorry, but I can't accept your quirk. I thank you for your offer, but I must ask that you find someone better suited for it," Izuku said bowing deeply towards All Might.

"I see," All Might mumbled to himself taking a thoughtful pose. "And there is nothing I can do to change your mind?" He asked getting a nod from Izuku. "Very well, then I ask that you meet me at the Dagobah Municipal Beach in two weeks after school. If you can't accept my quirk, then I would like to at least help you train your new power, but I need to make some arrangements before I can do so."

"Alright, I'll be ready," Izuku said determidly.

"Perfect, I expect nothing less from you! FAREWELL, YOUNG MIDORIYA!" All Might shouted buffing up before taking off.

"He's certainly an interesting character," King said in disbelief.

"All Might is so cool!"

Xxxx Fairy King's Return xxxX

"Today has been too long of a day," Izuku mumbled into his bed, glad to finally be home.

"It has been eventful day, but you can't go to bed yet," King said causing Izuku to look up at the fairy king. "You still need to call Oslo over here."

"Oh yeah! How do I do call him over?" Izuku asked his mentor.

"Whistle," King plainly stated.

"That's it?" Izuku questioned getting a not from King. "Alright, here goes nothing. *Whistle*."

As soon as the young boy finished, a dark portal appeared above Izuku, and a mid-sized, green and yellow dog appeared jumped out of it holding a green pillow in its mouth.

"Perfect, Oslo brought Chastiefol with him. Tomorrow, after school, we can get to work on training your magic," King said. "Get some rest Izuku, you'll need it in a few hours."

"Alright, good night King, Oslo, and thanks for everything King," Izuku said falling asleep almost immediately with the strange dog curling up a his feet. "So soft," he murmured as he fell into the land of sleep.

"Good night, Izuku," King said.

Chapter end

I hope that you enjoyed this. I am currently trying to work on the next chapter. By the by, Izuku is going to have a serious change in attitude coming up. I mean, he had dozens of years worth of memories shoved into his head. You try that and see if you don't change from that. See you next time and don't forget PLUS ULTRA.