HEYAA! I'm back with another fanfic! Yay! Since I absolutely LOVE x Reader/OC fanfics and I haven't done one on BNHA yet, I decided why not! Some stuff here may sound a little ridiculous, but please just bear with me! Pleaaase!

(Ps, I wrote this a while back, so some stuff may be a little confusing.)

Enough chitchat. You came here to read a fanfic, so let's get this show on the road!

"I don't remember much of my early childhood. Or rather - I don't want to remember. I only recall it as one thing. Hell."

"The countless hours of torture training I had to endure every single day, living the life of an assassin, were unimaginably painful."

"They did, however, make me immune to poison, make me able to withstand up to 2,3 million volts, make me able to easily snap a bone or cut myself without thinking much of it."

(If you get who I'm basing this off of, then crops to you! -)

"I was my family's biggest pride. I was already completely immune after the age of 6, which is where my intense killing training began."

"I was a prodigy. Of course - our "family business" is considered a top-ranked secret that must never be mentioned to anyone."

"Because of my intense training, I'm also able to stay awake for 4-5 days and have my brain on constant alert while sleeping."

"My physical strength and speed are also FAR above anyone else on my age, or well - practically anyone who doesn't have an intense strength or speed increasing quirk."

"I had to continue school as a "normal" child, even though it was clear that I wasn't like the others. I never cried, I never smiled and I never socialized with anybody."

"However - at age 7, my parents found it strange that my quirk hadn't developed yet, so they got me tested."

"Seemed I was quirkless... After that, the kids in my school heartlessly started picking on me, calling me names, but they quickly learned to stay away, as a group of girls was foolish enough to try and beat me up one day."

"I hospitalized all of them and was expelled as a result. It's an understatement to say that my parents were mad."

"They were beyond furious, and said, that as my punishment, I would have to serve 3 years in intense assassin service while being homeschooled."

"I've completely lost count of how many people I've killed at this point."

"I had to excel at everything. When you assassinate somebody, you don't have the time to hesitate. You must strike with ONE finishing blow, that is the most important rule of an assassin."

"Of course, there's also the fact that the job is never allowed to end in failure. Failure means execution."

"As you can probably see, I had a fairly rough childhood. Can't say I ever had a real friend."

"Well, as mentioned before this is how my life USED to be. Something rash happened that changed it one day."

"I had just finished a job on a stuck-up businessman, and I was preparing my leave, assuring I didn't leave any traces behind."

"One of the biggest challenges of us assassins is constantly avoiding the heroes. They are literally everywhere, but so is the scum of this city, so what can you do?."

"As mentioned before, I was just about to take my leave...I was around 12 at the time.."

FLASHBACK BEGINNING:

I walk out of the office, making sure no witnesses are around. After I double-check, I soundlessly jump up into the vent system and prepare to leave the building.

I quickly pull a black hoodie over my shirt to hide the blood stains that splatter all over my clothing. I pull the hoodie far over my bloodred dead eyes. I leave the building as if nothing ever happened.

A couple seconds later a hear a high pitched girl scream coming from inside the building. I smile devilishly and continue on as police cars arrive.

I walk down the streets, like any other normal 12-year-old. I take a lollipop from my pocket, open it, and insert it into my mouth.

I stare at the sky. 'Another human life... wasted.' I think to myself. I've never been fond of killing, but it's our job, so there's not much I can do. Besides- I have no idea what I would do if I wasn't an assassin anyway.

I've never liked the thought of being a villain - and I kinda think I lost my chance to be a hero at this point. I sigh and walk further down the streets.

I walk past the park, where I see a group of kids ganging up on a green-haired plain-looking boy. He looks scared.

'This world is so corrupt.' I think as I stop and listen in on their conversation. Not like I had much more to do.

"Seriously, you're so useless Deku!" "Yeah!"

"- I mean, you're forever stuck as a quirkless nobody, Deku!" "Deku! Deku! Deku!" A blonde boy, that looked to be the leader kept calling the other boy the irritating nickname.

'..What? That green haired boy is quirkless? Like me?' I think.

"Stop it Kacchan... You know it's not my fault my quirk hasn't manufactured yet! And I can still become a hero!" The freckled boy stutters back.

"HA! You - A HERO!? No way in hell they're ever gonna let a useless person like you become a hero!" "Deku! Deku! Deku!" They keep taunting him. The boy looks as if he's on the verge of tears.

I don't know why, but for some reason, I feel irritated. REALLY irritated. I walk over to the group.

"What right do you have to judge him, bastard?" I ask hard. The group turns to me and stares in confusion.

"Who the hell are you?" The boy known as "Kacchan" exclaims.

"No one important. What's important is, that you say they aren't gonna let useless people like him become heroes, but they certainly won't let nasty people like you become heroes either. No way in hell." I say with a smirk on my face.

"What did you just say!?" He looks mad. I snap over to battle mode and start locating his weaknesses. It's a habit.

'Short temper, overconfident, low physical strength, unknown quirk.' I think to myself. I'm completely calm.

The boy in the back looks very flustered. His eyes are moist. 'Oh sheesh. Let's not even BEGIN on that one's weaknesses.' I think as I close my eyes and focus on the situation at hand again.

Kacchan looks extremely mad. " Let's get to the point. Why don't you all just scram and leave this nobody alone? Come on, run along to your mommies now - shush." I say as I flick my hands as you would at a cat.

"You're gonna pay for that!" The short-tempered blonde yells as he runs towards me. To me, it seems as if he's running in slow motion.

"Hhh. I tried to warn you, but you're asking for it." I say.

'I'll have to be careful. Don't want to accidentally end up killing him. A chop to the neck should do the job just fine.' I think.

I notice the smoke rising from his palms. I start thinking of all the quirks that could possibly be, but he answeres that question for me, as his palms release small explosions. The smoke covers everything for a second.

"That'll show her boss!" "Yeah, you're the best Bakugou!" I hear a couple of voices along with a grin.

'So that's his quirk..' I think as I walk out of the smoke completely unscratched.

"I see. So that's how it works." I say. They all looked startled at me, but the boy from before looks furious.

"You sweat nitroglycerin-like substance, which allows you to create a chemical reaction that creates an explosion. That's a very interesting quirk." I say.

He looks extremely creeped out. "How- how do you know that!?" He yells. I smile evilly.

"It was nice experiencing your little trick, but now it's MY turn," I say as I accidentally let out a little bloodlust.

He looks terrified, and I quickly, quicker than any of them can process, run over to the group of boys and chop him in the pressure point located in the neck. He passes out instantly.

The other boys stare terrified at me, including the green haired boy. "Pathetic..." I whisper to myself.

I slowly make my way towards the boy in the back. The others look scarred.

He covers his head in fear, he's shivering like crazy. "You," I say. He starts shaking even more. I'm pretty sure he's crying.

"What's your name?" I ask. He looks at me in doubt for a couple of seconds before answering.

"I-I-Izuku Mi-mi-mi- Midoriya." He stutters. I put my hand in his messy hair and look at him.

"And you're quirkless?" I ask. He nods hesitantly. I give out a soft smile. "I guess we're two then."

He looks at me in doubt, but he stops shaking. "You... you're quirkless too?" He asks. I simply nod in reply. I can feel two heroes coming our way.

"Kids!" They yell. "Woah! It's the pro heroes Snipe and Death arms!" Izuku looks extremely aroused. 'What a fanboy...' I think to myself.

"Is everything alright? We felt a weird presence coming from this direction." They ask.

'Crap. I guess I accidentally let out a little bit of bloodlust before...' I put on my innocent child act.

"We're okay, but Bakugou-chan fell and hit his head! Right boys?" I ask. It takes a couple of seconds before any of them react, but they just hastily nod in reply, too afraid of what would happen in they didn't.

Death arms bends down and checks his pulse. "He's alright, he's just unconscious." I sigh a fake sigh of relief.

"You should probably take him home. Does anyone know where he lives?" Snipe asks.

'They're his friends, of course, they know, dumbass.' I think. I'm surprised when no one from his gang raises their hands.

"I do," Izuku says as he raises his hands. "Great. Stay safe kids," Death arms says.

"We will," We all say in unison. The two heroes then leave. "I think it's about time you scram," I say to what's left of the group. They leave hastily.

I turn around to see Izuku trying to pick up Bakugou's body, but he's too heavy for the little guy. I sigh as I walk over, and without breaking a sweat, grab him and let him rest up against my back.

"Lead the way," I say.

"Th-thank you." The little boy mutters. We start the walk towards the boys' home. Izuku looks very anxious, yet sad at the same time. The sun started setting.

I decide to try and get a conversation running.

"How come you know where he lives?" I ask.

"H-huh?" He replies nervously. I sigh.

"I SAID, how come you know where he lives? Isn't he just some bully that won't leave you alone?" I ask.

"W-well kind of... I-I mean... We're childhood friends, but he likes to bully me because I'm quirkless. And he gave that awful nickname too." He replies.

"I'm not one to talk since I haven't really had friends, but I don't think that's how friendship works."

"I-I know. But he's the only one who I can be with..." He says. We're nearing an apartment complex.

"Is it around here?" I ask. He nods in reply. We walk for another couple of minutes in silence before Izuku breaks it.

"Are you really quirkless?" He asks. "Sure am." I reply. He looks down.

"It's just... the way you defeated Kacchan, you were so amazing! I can't believe you did that without a quirk. I'm sure you'd make a much better hero than me, considering Kacchan is so much stronger than me." He says.

'Me? A good hero? You have no idea...' I think.

"We're here!" He says as we stop in front of a door. Izuku knocks on the door. A young looking blonde woman opens it a couple seconds later.

"Hello, aunt Mitsuki!" Izuku says with a smile. "Izuku! What a surprise! What brings you here?" She asks.

"Kacchan hurt himself while we were playing today, so we brought him home." He says. Mitsuki looks at me in surprise.

"And who might you be?" She asks. "No one special. Izuku was just struggling so much with carrying Kacc- I mean Bakugou-chan, so I decided to help out." I say.

"Well, that was certainly nice of you. That boy does nothing but get into trouble." She sighs. "Thank you for bringing him home." She happily accepts the unconscious boy and closes the door.

I look at the sky. "It's getting late," I say. Izuku nods.

"Do you live around here?" I ask. Izuku nods. I sigh. "Fine. Might as well walk you home. Knowing you you'll probably trip over a rock." I say.

"Re-really? Are you sure that's okay?" He asks.

'No, actually it's not. I missed 3 clients today because of this little incident, but we might as well take it the last step now that I'm here.'

"Sure. I've got nothing better to do anyway."

We walk towards Izuku's home in silence. Right as we made it there, Izuku confronts me as he's about to open the door.

"Thank you for saving me today. What's your name?" He asks. There's silence for a couple of seconds.

"Call me Mei-chan," I say. "Mei-chan..." he repeats. He smiles an innocent smile.

"Let's be friends okay?" He reaches out his hand. I don't know what to do. I've never been in this kind of situation before.

'Friends? I've never had a friend before.' I can feel a new emotion inside of me. A smile is formed on my lips.

"Yeah!" I say as I take his hands. 'Is this... what happiness feels like?' I wonder. He giggles, says goodbye and goes inside.

I stand there for a couple of seconds before I realize what just happened. "I just made a friend..." I mumble to myself. I leave.

After walking for another 15 minutes or so, the sun has completely set, and I'm home. I don't need to say anything as I walk inside, I know my parents know I'm there.

"And where have you been?" My mom asks. She's still in her work attire.

"I just took a little stroll," I say placing my shoes neatly.

"Oh yeah? Because of you, we missed 4 important clients today! Do you know how much that is gonna cost us?!" She yells. My mom is the best at hiding bloodlust and insanity.

"Yeah, yeah. I'll just pay off the hours in solitary confinement, don't worry."

"No." I hear my dad's voice. He's still got some blood splattered on him, so I assume he just finished a job.

"We have to make sure this kind of thing never happens again." I instantly think back to Izuku's promise.

I say nothing.

"Oh so something did happen"

"No, it didn't,"

"Don't lie to us! We aren't so stupid as to accuse of anything without evidence."

"That boy in the park, who was he?"

"... Who?"

"Midoriya Izuku ring any bells?"

"Shut up!" I don't want him to get involved in anything.

"You didn't become friends, did you?"

"No of course no-"

"You did."

"You know better than to lie to us." My dad says in a strict voice, as he glares with his deadly eyes at me. My mom does so as well.

'This could end having to put me through more torture than what's needed. I'll have to watch my words.' I think to myself.

"Alright, I get it. I won't ever let somebody distract me from my duties again."

"If you happen to run into him one day then what will you do?"

"If he were to ever know about our business then what?"

"You know what happens if the secret gets out."

I sigh. "All witnesses must be eliminated, we switch identities and move to a different country. I get it."

"Let's see if you truly understand the meaning of being an assassin. Repeat to me the 3 rules of the Ryuketsu family."

I sigh. "Rule number one, you must always finish your job in one blow."

"Rule number two, you must NEVER get discovered or leave any traces behind, or get discovered as that results in failure. Failure means execution."

"Rule number 3..." I stop for a couple of seconds before answering.

"You must never get attached to anyone, not even your family, as anyone could potentially be your target, and hesitation isn't an option." I look at both of them.

"There, you happy?" I ask. They nod as a reply. My mom grabs her gloves and puts on her coat.

My dad changes into a clean uniform and puts on his mask. I feel my heart sting as I realize where they're going.

"Hold on... are you... going to Izuku's house?" I ask in a firm voice.

"Yes of course. We cannot ever allow anyone to get in the way of our business. This boy could eventually end up becoming a threat." My dad replies. He looks strictly at me.

'Dammit! Izuku... I don't want you to.. but I... Why did I get you involved!?' I think to myself as I clutch my teeth.

Too late, my parents are already out of the door.

"Goddammit!" I yell as I sprint after them. They're some of the only people I know who can outrun me.

A sweatdrop can be spotted on my forehead. I move silently along the shadows, just as assassins are supposed to.

'I'm coming Izuku...' I think as I recall the sweet smile he sent me before.

I reach the apartment just in time, as I can spot my parents on the roof.

"Don't," I say as I jump in front of them.

"Out of the way." My dad commands, but I stay right where I am.

"No," I say.

"You dare talk back to us!?" My mom says as she grabs me by the collar.

"I won't let you kill Izuku, my first friend," I say as my blood red eyes start glowing in the dark. If it wasn't for the fact that my mom was there, I would've been leaking bloodlust right about now.

"Assassins don't have time for friends!" My dad yells as breaks my little finger to prove his point. I think nothing of it.

"Yeah right.. who said I ever wanted to be an assassin anyway?" I ask. My parents have a mixed emotion on their face. They look both shocked and furious.

"That's enough!" My dad yells as he throws his knives at me. My mom is holding me too tightly to get free.

All of them hit me, and I fall to the ground. I may be an assassin, but getting 6 knives flung into my chest is something I can't just shrug off.

I cough up blood and look up to see my parents look at me with their dead eyes.

"You disrespect our family, you peasant. To think we thought of you as our pride... despicable." My mom says. She raises her long katana over my chest, and before I realize what happened, strikes it through my chest.

I cough up blood again. I close my eyes. But... I'm not dead.

Actually. I can't feel anything. My parents seem to think that they killed me, as I can still hear them. I stand up, and my parents look horrified. There's a sword going straight through my heart, yet my chest looks untouched when I slowly pull it out.

'I never knew... I... is this my quirk? Immortality?' I'm just as shocked as my parents, but I decide to make up my mind later. I can't prevent my bloodlust from leaking out anymore.

"Now... I think it's about time... You. go. to. hell." I say as I look at them with deadly eyes. They both sweatdrop, and look at me like I'm a monster.

I run quicker than ever and before my parents can realize what's going on, I'm right behind them.

"Got you," I say as I slice my blade right through their throats, killing both of them instantly.

"Rule number 1. You must always finish your job in one blow."

I look at them both.

"Rule number 3. You must never get attached to anyone, not even your family, as anyone could potentially be your target, and hesitation isn't an option."

I drag both their bodies to the nearest dumpster and leave them there. I hold up the lid for a couple of seconds.

"Rule number 2. , you must NEVER get discovered or leave any traces behind, or get discovered as that results in failure. Failure means execution" I mutter as I slam the lid in.

My eyes feel even more lifeless than before. 'Am I... Immortal?' I think to myself. I'm standing on top of a 20 story building.

Without giving it a second thought, a throw myself over the edge, letting my body fall.

I hit the ground a couple seconds later. Blood splatters everywhere. But I'm... still alive. I can't even feel any pain.

I look at my stomach and see my wound healing itself. For the first time in years, I cry.

'God dammit. So this is why the torture stopped hurting so quickly? I'm freaking immortal.. but the doctor... Damn that bastard! He lied to us and switched out my X-ray!' I think.

I don't know how to feel. 'I've never heard about someone with this kind of quirk before.. and where did it come from? Both my parents have assassination-related quirks..'

I'm too confused to really do anything. I just walk. Walk, without thinking...

"Mei-Chan!" I hear a distant voice yell.

"Izu...ku-kun?" I ask. The little boy is sprinting towards me.

"There you are! I was looking for- Oh my gosh are you okay!?" He says as he notices my blood-splattered clothing.

"I'm alright," I say.

"A-are you sure? Th-that's a lot of blood..." He asks.

I can see that he wants to gag.

"Look," I say as I show him my stomach.

"Nooo wound to be found." He sighs.

"What are you doing out here this late?" I ask.

"I was looking for you! Some strange noises were coming from our roof, and it woke me up. I was really scared, and I just laid there for a while shaking. But then I thought, "what would Mei-chan do in this situation?"

"And then a couple seconds later I see you jump down from our roof! I decided to follow you here to say thank you because the weird noise stopped after you left!" He says smiling.

'This kid... he's so innocent.' I think to myself. I don't know what to say.

"Let's make a promise!" He says as he puts out his pinky.

"Let's become heroes together okay!?" He says.

"I...I..." I stutter.

"Come on! We'll both go to U.A and become the greatest heroes of all time!" He says.

"I..."

'What should I... do?' I feel life coming back into my eyes, and my cheeks getting warm.

'Am I... Am I blushing!?' I think.

"A...alright." I say as I reach out my pinky, and braid kine together with his"Yay!" He shouts as he runs back home.

"Make sure you keep that promise, okay!?" He yells before running into the night.

'Izuku... you just gave me a new goal in life.' I think to myself.

'I'm going to become a hero!' I say as I've now got new inspiration.

LONG FLASHBACK END:

"Now that, is how my life changed."

"I got contact lenses and cut my hair after the incident, so the government wouldn't be able to identify me."

"There were a lot of times when I wanted to kill myself. But nothing worked."

"Any kind of stab wound or the alike would heal up quickly, drinking poison didn't work either, I could breathe underwater, I can't electrocute myself, and I can't strangle/hang myself to death either."

"It's impossible to get out of this reality. But then I remembered my promise to Izuku all those years ago."

"That's what made me consider getting into U.A. Fulfilling my promise to Izuku."

"I eventually built up a new fake personality of a sweet, innocent girl, and got into a foster home."

"But everything kept bugging me every time I tried to sleep."

"It continued on like this for years."

"Until today."