Disclaimer, because this is very important. Despite what many of you were probably assuming, I am, in fact, not Kohei Horikoshi, and therefore do not own My Hero Academia or anything related to it aside from this particular fanfic and any OCs that I happen to sprinkle in. There, now that that's all said and done, Enjoy!

Chapter One: My Original Sin

What is sin exactly? Is it something that society has deemed to be morally wrong, or is it more individual than that? Are sins as innumerable as the people that commit them, or are they all just variants of the original seven? Is sin even real, or is it merely a social construct that was made to be the enemy of morality? Is sin inherently evil, and if so, what does that say about the sinners?

These are all questions that I've had to ask myself over the course of my life so far. Ever since the true nature of my quirk was revealed to me, I've pondered the answer to all of them and more. And on the rare occasions that I've revealed the nature of my quirk to others, I've never had any shortage of people telling me exactly what they thought of it and, in turn, what they thought of me. Freak. Sinner. Devil Child. Demon. Monster. Villain. No matter where I went, as soon as someone learned of my true power, these words were always sure to follow.

Now, you must be wondering by now what quirk could possibly be so bad that it would instill this kind of hostility against a child, so I'll tell you. But, in order to properly tell this story, we're gonna have to start at the very beginning, starting with the day I fought my first villain.

Hi, my name is Izuku, and this is the story of how I became the leader of the best team of pro-heros in the world.

Flashback: Many Years Ago.

Izuku POV

"Oh boy oh boy oh boy! I can't wait to see what quirk I'm going to get! I bet it's gonna be so cool, like Kacchan's, or maybe even All Might's!" I said practically vibrating with excitement in the waiting room of the doctor's office. I woke up yesterday morning with my entire body tingling and hot and my throat really sore, so I just knew it had to be my quirk finally showing up, so I ran to my mom and dad's room as fast as my legs could take me. Ever since Kacchan got his super cool explosion quirk, I've been waiting very impatiently for mine to appear, and now it's finally coming.

"You know, Izuku, this might not be your quirk showing up. It's possible that you might just be getting sick or going through a growth spurt." Inko said, trying her best to contain the ecstatic child in her lap. I barely even heard her as I was thinking of all the possibilities of what my quirk could be. Maybe I'll be able to grow really big, or grow wings, or shoot fire out of my mouth, or maybe even make fire anywhere on my body like that flame hero Endeavor can, the possibilities are endless! I've been thinking about what I'll get all day yesterday and today. I could hardly even hold still during school without shaking with anticipation.

"Midoriya." The lady with a clipboard by the door called.

I hopped up out of my seat and ran over to her "That's me! Can I learn what my quirk is gonna be now? I've gotta plan what my costume is gonna look and what my hero name is gonna be and what kind of sidekicks I want and how I'm gonna be the number one hero in the world!" I said all in one breath, nearly forgetting that even heroes need air. The nurse just looked at me and smiled, saying "Well, aren't you ambitious? Since you've got all that planning to do, let's not waste time getting you back to the doctor so he can run some tests and see what the future number one hero's quirk will be." With that she started walking back to the office, with me in close pursuit. I think I heard my mom yell something about slowing down. Pfft, like that was going to happen. Destiny awaits!

Time Skip: 2 hours later

"Look kid, we've run every test we can. Based on the tests, it's possible that you could be in the process of developing a quirk, but you could just as easily be getting a cold. It's just too early to tell." As the doctor said this, the smile I had been wearing all day disappeared. "So you don't know anything about my quirk? Not even what type it will be or if I'll even get one?" I said, nearly on the verge of tears. When I woke up from that dream, I was so sure that I was getting my quirk. In the dream I was a hero, fighting bad guys and making sure justice prevailed with a smile on my face, just like All Might.

"I didn't say that. When we took your X-rays, we did notice that your pinky toes only have one joint, meaning that there is still a very strong chance that you'll get a quirk. We're just not sure what it will be. We do, however, know a few things that it won't be. Namely: either of your parents' quirks. We checked your mouth and hands for signs of your father and mother's quirks, but we found no trace of either. So assuming you do get a quirk, it's a safe bet that it'll be a one of the rare mutation quirks that will be unlike anything in your family. On top of that, we do still have a few tests that haven't come back yet that could yield some additional information." Upon hearing this, I perked up a little. Sure, it wasn't exactly the news that I had hoped to receive, but at least I know that I will be getting a quirk. I had started thinking that I might not get one at all. Plus, I know that it'll be different from both of my parents', whose quirks are admittedly pretty weak. Who knows, maybe I'll get an even better power than Kacchan's!

"When exactly will these other tests come back?" My mother asked while checking her watch. "I'm not entirely certain. You see, most of these other tests involve trying to find triggers for any quirks in your son's DNA, so the timing depends on where on the list they find one. The tests should be running now, so it could take anywhere from 5 minutes to 5 days for the results to come back. You're welcome to wait in the lobby for a little while if you wish."

I looked up at her with the cutest face I could make, "Can we pleeeeeeeeeeaaaaaassssse wait for a little bit?"

"No, Honey, I'm afraid we can't. We're already going to be home later than your father was expecting us, it's probably even dark outside by now. We don't want to upset him anymore, so we should probably be leaving." That cute face I was making at her instantly melted into a light pout, but I slowly nodded in agreement. Daddy usually wasn't in a good mood when he was home, so I knew she was right, we shouldn't keep him waiting.

At this point Mommy stood up and thanked the doctor for all his help, a gesture that I quickly replicated. "You're both very welcome," the doctor said as he stood. "Your phone number is in our database, so if the tests turn up any new information, I'll give you a call." At this, he walked to the door and showed us out. Somewhere between the office and the checkout desk, I let out a big yawn. My mommy just signed and picked me up, and I didnt object. It had been a long day and all the excitement and bouncing around had made me very tired. We didn't even make it to the car before I was out like a light.

Inko POV:

As I carried my precious bundle of joy to our car and carefully put him in his car seat, I started thinking about all that Dr. Tsubasa had said. Izuku wouldn't have a quirk like mine or like Hisashi's, so who knows what it could be. He could sprout wings, or be super strong, or even have a laser that shoots from his belly button! But it doesn't really matter, I don't care what his quirk is, just as long as it makes him happy. I know that he wants to be a hero, so for his sake I hope it's strong. But just thinking about my baby going out and risking his life as a pro also worried me to death, so for the sake of my nerves I hope it has some sort of durability built into it. I thought about these things for the entirety of our drive home until I noticed our turn was coming up, meaning we had about 5 minutes remaining. Then my thoughts turned to what we might be walking into. My husband was once a very kind man, but after years of working stressful jobs that require so much travel, his once cheerful exterior that he usually had when he was home had slowly hardened into one of anger and distrust. To his credit, he did his best to try to keep Izuku from seeing his inner demons, but there had been a few times when alcohol was involved and Hisashi had gotten violent with me around him. I tried to assure Izuku several times that he was just playing, but I could tell he knew I was lying. He had even asked me once if All Might was going to save me, which I could only cry in response to. I can only hope that for his son's sake, he will have forgone the booze tonight. But as I pulled to their apartment building and saw an empty case of his favorite Sake, those hopes were soon shattered. As I parked I started to wonder if and how I could get Izuku inside without waking him. Before I could think too much on this, my cell phone began ringing.

"Hello?"

"Hello, Mrs. Midoriya? This is Dr. Tsubasa."

"Oh, did Izuku's tests come back already?"

"Yes, and I'm afraid I may have been wrong about your son's quirk. As I told you earlier, the tests we sent out are designed to find triggers to any existing quirk in one's DNA. Well, we found Izuku's: Rage. When we exposed his blood to even the smallest amounts of the body's natural rage chemicals, it started heating up rapidly and expanding, which could have easily been the cause of that tingling feeling he described. We suspect that there were other changes happening in Izuku's blood, but before we could examine it in depth the vial broke and the experiment effectively ended, though one lab assistant swears she saw his blood start glowing right before. I personally suspect that his could be a complete transformation quirk, though I haven't the foggiest idea what he could be able to transform into."

"So you're telling me that my son's quirk is activated by rage and can allow him to transform into some sort of creature?"

"Yes, but the power and magnitude of this transformation is still a mystery to us. We need you to bring Izuku back as soon as possible so we can get an accurate idea of this."

"Alright just let me tell my husband and -", I cut off as she heard a door slam.

"Hey Inko! What took you so long?!"

"Dr. Tsubasa, I'll have to call you back." And with that I ended the call without waiting for a response and got out of the car to greet my husband.

"Inko, did you hear me? I asked what took so long!" Despite wanting to do anything else, I put on the best fake smile I could.

"Yes, I heard you Sweetie. The doctor had to run a few more tests than expected, that's all."

"How many tests does it take to see if a kid can breath fire or move a toy with his mind?" He had definitely been drinking, going by how much he was slurring and the repugnant smell coming from him. I had better get Izuku out of here first before getting into this.

"Let me get Izuku to bed first and thenI'll tell you all about it." I could almost see his intoxicated mind process this before he responded.

"Alright, but then I wanna know what took so damn long, you hear me?"

"Yes Sweetie, I hear you. I'll talk to you inside" Seemingly satisfied with this, Hisashi turned and walked back to their apartment. Meanwhile, I turned around, opened the back door to the car, and began unbuckling Izuku from his car seat.

Izuku POV:

I woke up to the feeling of my mommy picking me up. "Huh? Are we home now?" I said groggily, barely noticing that we were moving towards the house.

"Yes my little emerald, we're home now." I'm going to take you up to your room so you can go back to sleep." I just nodded in agreement, as I was still really tired. However, even in my tired state, I still noticed she said a word I don't know.

"What's an emerald?" I asked, genuinely curious as I had never heard of one. She replied with a light chuckle followed by her explanation.

"An emerald is a precious gemstone that's even rarer than a diamond and shines almost as green as that curly mess on top of your head." To emphasise this, she started ruffling said curly mess, much to my immediate protest.

"Stop, stop!" though I said it with a smile. "One day when I'm a pro, I'm gonna shine bright just like an emerald."

"Yes, my little gem, I'm sure you will." By the time she said that, we were standing at the door to our apartment, and I could faintly hear the TV on the other side, so I knew Daddy was home too. We walked in and she carried me to my room, helped me change into my favorite All Might PJs, had me brush my teeth, and finally tucked me into bed.

"Do you think my quirk will be strong?" I asked while fighting back a yawn.

"Yes Izuku, I'm sure your quirk will be very strong." she said with a smile.

"But how do you know? The doctor said it could be anything. I could get stuck with something dumb like extendable fingers or an extra bouncy forehead." I replied, finally voicing some of my concerns.

"I know because the future number one hero will need a strong quirk in order to keep everyone safe, and there's no way you won't reach your dream with all that drive and that super big heart of yours, so naturally your quirk is going to be strong. Besides, between you and me, the doctor called earlier while you were asleep." At this, I suddenly felt a lot less tired.

"He did? What did he say?!"

"He said that your quirk was so strong that we're going to have to come back tomorrow and see just how good it is, so you'd better get some sleep. Even All Might needs his sleep before a big day."

I certainly did not feel like sleeping after this news, but I knew that arguing would be pointless, so instead I just agreed and said "Goodnight."

"Goodnight, my little emerald." With that, she turned out the light and what I would soon begin to know as the worst night of my life truly began.

(Warning: If you get easily triggered by domestic abuse, you might wanna skip this part until Izuku's next POV)

Inko POV

I walked away from Izuku's room, having just put him to bed, and into the living room to face this drunken dragon. I had a feeling this wasn't going to be pleasant, so I started absent-mindedly rubbing the burns that came from the other night. Before I knew it, the couch was right in front of me, and my half-asleep husband was staring at the TV until he noticed me.

"So, now that the brat's in bed, d'ya mind telling me why it took two damn hours for a doctor to look at my son's throat and hands?"

"Well, the doctor did check those, but he doesn't appear to have either of our quirks. He ran kinds of tests trying to figure out exactly what Izuku's quirk will be." I said this very timidly, hoping that this quick, logical, truthful answer would assuage Hisashi's usual intoxicated tendencies.

It did not.

"So my son isn't going to have my quirk at all, not even combined with your weak ass telepathy. Isn't that just convenient. He's gonna be a miracle child with an ever so rare mutation quirk." Sarcasm was very evident in that last comment.

"Well, they are admittedly pretty uncommon, but they do happen. Izuku is very excited to see what he gets. The doctor even called on the drive here and said he found the trigger for it." I was still hoping that telling the complete truth would put Hisashi at ease.

Again. It did not.

"Yeah, bullshit." Uh oh.

"Excuse me?" Please let me have misheard him.

"Bull. Shit." He said with extra emphasis on each syllable. Oh well, hoping was worth a try.

"I'm not sure I follow." Please let me be wrong about where this is going next.

"You're telling me that son just so happens to be getting a random quirk that won't be anything like mine or yours, and you expect me to believe it?" A small amount of fire came out on the last word.

"I don't know what else to tell you, Hisashi." After I said this Hisashi stood up and stomped over to me, only stopping when he was directly over me.

"How about the truth? The truth about the brat's quirk, the truth about why you never kiss me anymore, or maybe about how that kid is even mine when I was overseas for two fucking months before you told me you were knocked up!" At this point, every sentence he said ended with a puff of fire.

"I am telling you the truth! Izuku may have a different quirk, but he is yours! I waited so long to tell you because I kept praying that the tests were wrong, because I couldn't bear the thought of another you being in the world! Thankfully, Izuku is nothing like you, he's sweet, loving, and above all, he's kind! As for why I never kiss you anymore? Have you stopped to consider that maybe it's because all you do is yell and drink when you're home?!" I had tears in my eyes as I looked up into his, but I didn't regret one thing I had said. I refuse to be bullied into silence by the man I once loved anymore. In my mind, the man I married is dead, and this filth is disgracing his name.

"Stop lying to me! Just tell me whose he is! Was it my brother Enji? He already took the powerful quirk in the family; he can make flames all over his body while I got stuck as a glorified lighter, I already had to change my name just to get out of his shadow, did he take my slut of a wife and my son too?!" At this point, I was completely terrified. Hisashi's quirk was going crazy with all the anger he was feeling at me. Despite this, I managed to find my voice in time to give him a response. I stood up so I could stand nearly at eye level with him.

"Listen to me, because I'm only going to say this one more time! Izuku. Is. Yours! Actually, no, Izuku was yours. After tonight, you've lost the right to my son! I'm gonna get him right now and we are leaving! As soon as I said this, I tried to duck away from him, only to have him grab my leg and cause me to fall.

"Like hell you are! You're not going anywhere!" He flipped me over and raised his hand high and brought it down face, resulting in a resounding SMACK! and an explosion of pain for me.

"Now, I'm gonna make you pay for even thinking of leaving me!" He raised his hand once again, this time in the shape of a fist, and brought it down with even more strength then before, hitting me right in the eye. I let out a cry in pain and mentally conceded that this fight was over. He had me pinned, so there was no way I could escape. "Let's see you try to cheat on me again once your pretty little face is all burned up." he said maliciously as he activated his quirk and brought the flames closer and closer to me. As the fire neared my face, I just closed my eyes and accepted the inevitable.

...

But the inevitable never came. Just as I could feel the flames start to singe my eyebrows, we both heard a very deep voice yell out "STOP!" We were so surprised that Hisashi's quirk deactivated. I took this as my opportunity to escape and pushed my soon-to-be ex-husband off of me and scrambled away. I then looked in the direction of the voice, only to find something very surprising.

"Izuku?"

(Trigger Warning Over)

Izuku's POV

A few minutes ago

I don't know how Mommy expected me to sleep after that. I'm gonna get a super powerful quirk! All of the ideas and images I had thought up over the last few days had been blown out of the water by all the new ones I had. Maybe I'll get All Might's quirk! Or Edgeshot's! Or Endevour's! But as I was thinking about all the possibilities of my apparently very powerful quirk, I heard the conversation in the next room start getting louder and louder, even Mommy eventually losing her normally mousy tone. Most of the conversation didn't even register until I heard my father say that he has a brother. I didn't know I had an uncle, let alone one with a powerful quirk. And apparently he thought that Mommy had done something bad and cheated on him. This made me very mad, because Mommy told me that only really bad people cheat, and she isn't a bad person at all, even Kacchan says so! As the conversation grew even louder, progressing into all out screaming, I kept internally debating about what I should do. I heard All Might's voice in my head, saying to help the weak and the oppressed, both of which seemed to fit Mommy right now, but whenever I would move towards the door, fear would grip my stomach and cause me to move away. I can't fight Da- no, Father. I may have a powerful quirk, but I don't know what it is or how to use it, and he definitely knows how to use his. I'll be scorched and burned beyond belief before I can say "Detroit Smash!". But as my internal monologue continued, I heard a sound that would change everything.

SMACK!

That sound was most definitely a slap, and given that I could hear Mommy crying immediately after, I knew exactly what had just happened. Before I could think about it any more, I was on my feet and walking outside my door, rage at my father burning intensely like I had never felt burn before. I marched over to my parents, taking in the scene. They were no longer on the couch, where I assume the conversation started, but were instead on the floor in front of it, with Father hunched over Mommy, her being pinned by his legs. Both of them were too engaged in the still-unfurling events to notice me. I could see that Mommy's eye was turning dark, meaning that the monster had hit her a second time. At this point my blood felt like it was boiling. Everything felt very hot, the air seemed to simmer around me, and all I could hear was the rush of blood in my body. As soon as I saw him activate his quirk and start lowering towards Mommy, I knew what I had to say.

"STOP!" I yelled in a deep, almost demonic voice.

At this, both of my parents jumped in surprise, but Mommy recovered quicker and pushed Father off and crawled away. They both looked at me with shock evident of their faces, but in both cases, their expression quickly changed. Mommy's face changed to a look of concern, almost asking what I was doing here, while his expression became a smirk.

"So, the brat came out to play hero after all. Well, that's fine by me. Once I burn his face, you two will be a matching set." He ran up and lunged at me and threw a punch right at my stomach, but to his surprise, I caught it. Evidently, he was still fairly drunk, because after his initial confusion was dealt with, his best idea was to try it again. And again. And again. All ending in the same way as the first, with his fist getting stopped by my considerably smaller hand, all the while I was glaring daggers into him with my anger only growing.

"I said, STOP!" I yelled in that same voice, this time with a puff of fire coming out with the last word, surprising both of my parents. At this point, I was too angry to feel any surprise, only rage towards this waste of flesh before me.

"Well well, would you look here, slut, it seems our boy got something from me after all! But if you think that little puff is going to be enough to save either of you, then you'd better think again. Do you know why I named you Izuku? It was because if you look at the name differently, it means useless! I knew from the moment of your birth that you'd be nothing, just a miserable, useless brat! Of course, that dumb bitch over there that you call Mommy was too stupid to realize any of this!" Ok that's it! The news of my name was certainly upsetting enough, but as soon as he insulted my Mommy, the nicest, most beautiful person in the world, right in front of me, that was the proverbial last straw.

As I felt my rage growing more and more, the heat underneath reached unbearable degrees, but I just stood my ground, not letting my father see any bit of this pain. Speaking of him, the man standing before me was suddenly seeming much smaller and smaller as I started growing rapidly. And I wasn't just growing, I was changing. I could feel my fingernails lengthening and sharpening into talons, my skin expanding and sprouting scales from my pores, my face lengthening outward into a snout, and my back and waist erupting in pain as I felt what I would later learn were wings and a tail growing out of me. Eventually I felt the ceiling touch my back, but as quickly as I felt it touch, I felt it break into pieces as nothing could stand in my way now, least of all something as trivial as room dimensions. At the end of my transformation, I was a mighty 10ft tall emerald green dragon with massive wings and a tail to match. Oh, and did I mention that I was seriously pissed?

As for the object of my unholy wrath, he was doing what any sensible creature would be in his shoes; he was attempting to run away. Unfortunately for him, a section of the ceiling had fallen on him in his attempt to flee, leaving him trapped before me. When I looked at him from high above, he had the audacity to act like the previous moments didn't exist.

"Please, son, spare me! You and your mother can go, just let me live!" he pleaded.

"YOU DARE MENTION HER TO ME AFTER ALL THAT YOU'VE DONE?!" I yelled at eardrum-shattering volume levels.

"Look, I'm sorry, I didn't mean anything that I said, I was drunk and confused! Please forgive me!" I looked at him for a second, before giving my response.

"No."

And with that one simple word, I leaned forward and engulfed my former father in a torrent of brilliant green flames. Within seconds he was nothing but ashes.

Despite that, my rage was not effectively quelled. If anything, it just added to it. My father, a man who tormented and abused Mommy for years, chipping away slowly at the love she once held for him and replacing it with pain, had his own punishment ended within seconds! Where's the justice in that?! Just thinking about all this was making me angrier, especially since I could no longer do anything about it, until I felt the heat rise in my throat once again. Knowing what was about to happen and not wishing to destroy anything else, I instinctively pointed my snout to the sky before unleashing another HUGE stream of green fire. I really hope nobody too important saw that, I thought in the back of my head. Even though my father was now dead, I still had an urge to go seek out villains and show them my true wrath and bring them to justice, just like All Might would! But just as I was prepared to go seek some deserving criminals, I heard a sound that would soon sweep all of that rage and all those thoughts of divine justice away.

Sobbing.

I turned around towards the noise, as much as I could turn around in this tiny apartment anyway, to see my Mommy, who was miraculously unharmed by all of the debris, laying in the exact same spot that she was in before, crying. Upon seeing, the floods of wrath that I had been feeling grow exponentially over the last several minutes now seemed to have a drain at the bottom, one that was letting all of it quickly wash away. I could feel myself shrinking smaller and smaller until I was close to Mommy's level once more. I didn't understand why she was crying, her husband was a bad man, so I ended him. That was a good thing, right?

"It's alright now Mommy, you're safe. I protected you." I said this in almost my original voice, I was still reverting, so some of my features were still slightly draconic.

"S-s-safe? Hisashi is d-d-dead? Y-y-you killed him?" I could tell she was still terrified, but at the mention of his name some of the wrath I was still draining surged back for just a moment.

"Yes, he deserved to die for all that he did!" I said with a small amount of fire coming out on the last word. Mommy suddenly went wide-eyed before she spoke again.

"M-m-m-m-m-m-monster!" she screamed this at me, much to my astonishment. Why is she screaming that? The monster is dead.

"Mommy?" I asked her in genuine confusion.

"Monster! Leave!" She screamed once more, this time pointing at me. Oh, I'm the monster. I didn't understand, but all of that previous wrath had left me too emotionally drained to really understand her. All I knew was that my Mommy, who I just fought so hard to protect, was now screaming at me and telling me to leave, so I did the only thing I knew to do. I left.

With tears in my eyes at this sudden development, I turned and ran out of the now-incinerated door, fleeing the scene just before any police arrived.

Author's Notes

Whew, that was certainly a lot longer than I thought the first chapter would be. But in all fairness, this is my first attempt at any sort of creative writing.

Well, where to start. I guess I'll begin by saying thank you to anyone that read this. I've thought about trying to write for years now, but this idea came into my head that I felt like I might explode if I didn't pen some of it down, and the more I got down the more I wanted to write, which evolved into this long-winded first chapter with several more planned.

If you hadn't guessed yet, Izuku's quirk is going to be called Wrath, and yes, I plan on bringing the other Six Sins in before too long. I will be incorporating a few elements from Nanatsu no Taizai, but not really enough to consider this a crossover.

I will say, while I haven't been a writer before, I have been an avid FanFiction reader for several years now, so I know how comment and review sections get. I don't mind criticism, in fact I actually quite like being shown how I can improve, but I ask that you keep it constructive. You know, more like "You're really wordy, you might want to condense it a little bit" or "You should throw some more characterization in for Izuku", not "You suck, this fanfic is trash, kys, delete this" or anything like that.

That's pretty much all I have to say. I can't really promise how often I'll be updating or when I'll be checking reviews as my work schedule is kind of hectic, but I do plan on going pretty far with this story.

See you all in the next update, MajorCrazy Out!