Fun Fact 1: This originally was supposed to be a Gon reader x MHA with Killua taking Akechi's place. In that story, Y/n would have faced off against other hunters in Hunter X Hunter and of course Hisoka. The final arc would have showed parallels to the ending in Hunter X Hunter, except instead of Kite being injured, it was Killua. The Arc would focus around Y/n and Killua's friendship as it built up to that point. I'm pretty good with putting hints in the story to let audiences know somethings that will happen in the future, like in this story.

Fun Fact 2: The next idea I had was to make it a older brother of Eri reader. It would dive into the lore of their quirks while also drastically changing the story. It would have dove into more of the quirkless people in MHA and explore more fatal accidents with quirks. Looking back on it now, the reader was like Hit from DBS.

Fun Fact 3: This one was a doozy. The story would have been a Ochako Brother villain reader. The reader would have been older than Ochako and not a twin. He would also have been growing up with Dabi and meeting Toga later down the line. The male reader would have been sold off to keep Ochako safe and no more money to be paid for the house. Y/n would then have been made to be a weapon by the people who took him until Toga, Dabi, and Stain found him. Y/n's motives would have been to rid the heroes of society so then Ochako wouldn't have to risk her life for their parents sake. Eventually, when he realized he couldn't change her mind, he killed his parents and made Ochako his enemy number one. It really would have down more into psychological nature of right and wrong Vs Good and Bad. Y/n wouldn't really know what right and what's wrong but he would think that what he was doing for the greater or good. Maybe I'll make a story like that one day.

Fun Fact 4: So in the end I decided to just make this book a crossover, that way, surprise characters could so up, like Roman and Team RWBY. Speaking of which, this story is actually connected to my RWBY story and hints at Persona 4 and 3 story... if I ever get the time. I eventually took a lot of elements from those stories into this one, such as Gon's rage, being the brother of Ochako, and potentially being close with Eri.

Fun Fact 5: This is gonna be surprising to a lot of people but, I wasn't sure I should have the wild card as a power that Y/n could have. I figured, 'How is he gonna be liked if he was overpowered?' I then remembered that if I got rid of the Wild Card, it's like putting milk before the cereal. Disgusting. So, I settled for a happy... well... a decision to keep the wild card... while get rid of the problem.

(Onto the one shot chapter)

You are seen to be overhead the city. The city was in ruins as part of the city broke even more. You smirked at the destruction. "Wow, never thought the city would fall this easy."

"Well, that's what happens when you're as good as you are!" A girl appeared next you.

"Ah. I was wondering where you were." You said as you turned around with a smile. "Toga."

"Yep! That's me! Any chance I can get some blood?" She asked you as you shrugged. This was the normal thing to do. She stabbed one of your wires in your arm as you gritted your teeth a little bit. "Don't be a wimp, I'm almost done."

"Easy for you to say. You're not the one being stabbed." You said as she ripped the tube out and you healed yourself. Toga looked in amazement. "There, all better."

"Wow! Was that the quirk of that one horn girl?" She asked as you smiled.

"You must have been talking about Eri. Yeah, that deal with Overhaul gave me sometime to process." You said as you got an alert on your earpiece. "Seems like the heroes are almost there. I better go back out to find the U.A students!"

You started glowing with black lighting. Toga smiled and waved as you ran away. "Good luck! Hmm...?"

"Help! Please!" Someone said as Toga raised her hand. Black aura surrounded the whole city as the buildings and debris started to fly towards the hero. Toga gained a deadly face and killed at the hero.

"This is for Twice..." She said as he leaped away. You are seen flying through the city, pretty cool that you caused this much damage.

"My quirk's pretty unstable, not that I would know," You say as you smirk. You see a city full of pro heroes and drop down to them. Iida looks up in shock.

"No! It's Joker!" He said as the rest of the 1-A heroes looked at you. The people were scared of even the mention of you and starts crying and running in fear.

"We're all gonna die!" Someone shouted as someone else fell to the ground.

"So this is how it ends, huh?" Someone said as you put your hands in your pocket. You looked around to see your twin.

"Ah, there you are, Sis. I was wondering when you'd show up." You say with a smirk as Ochako looked terrified.

"Why-! Why are you doing this?!" She demanded in fear. You titled your head to the side.

"Well, I believe society needs to start over, so people aren't dependent on the so called heroes. So they can't blame the heroes for failing..." You said as Todoroki tried to attack you with his ice from behind. You gave a knowing smirk. "Like this."

Black aura surrounded the young hero and pulled him to you hand as it extended out. Ochako was livid. "Y/N! STOP!"

Too late. You twisted your hand and snapped Todoroki's neck. You dropped his dead body without a hint of remorse. "That's one down." You then looked at the rest of the students. "19 more to go."

You took a step on the ground and it started to... Decay. The heroes looked in fear... "EVERYONE GET BACK!"

You stomped the ground even harder and broke more of the area with your Zeroes. The decay spread throughout the city and soon engulfed the heroes. You say Asui and Ochako leaping to safety as they watched everyone else die. Asui glared at you. "HOW COULD YOU?!"

"Easily." You say as you grab the tongue of Asui and decay her body, starting with her tongue. Then it was you and Ochako...

You smiled and raised the buildings and the clouds in the sky started shifting to surround you. You lost the smile as a tear came out of your eye. "Good bye, Uravity."

Deku is seen running with his earpiece. "Hello! Can anyone get me on this frequency?!"

"Damn it! Where'd everyone go?!" Kasumi shouted as they headed towards Tomura. The forest is seen covered in black flames as Jiro's earjacks are seen burning in forest along with Ashido's antennas.

"I never knew this is what Dabi felt. Feels pretty good to see the forest glow like this." You say as you are seen to be holding up Mirio with one hand by the neck. He tried phasing through your black aura but It didn't work. "Stop struggling. You're getting annoying. What quirk should I kill you with...? Oh! I know!"

You touched his chest and rewound his body with Eri's quirk. He eventually disappeared into nothing. You then smiled. "Yeah, her quirk wasn't curse, definitely a blessing. Alright, I guess I've had enough fun, I should go."

Deku is seen fighting Shigaraki in the air when suddenly the clouds started to change shape. Kasumi looks up in worry. "What the-?!"

Deku looks up in the sky as well as does a smiling Shigaraki. "Looks like he's finally decided to join us."

"Welcome to the party, Y/n." Shigaraki said as you waved your hand out. Deku and the rest of the pro heroes were sent flying back.

"Joker!" Deku shouted in worry but confidence but then saw... what was in your hands.

"Hmm? Oh, you noticed this? Here, I know this means more to you than it does to me." You tossed the bracelet of Ochako's costume after her body decayed. You made sure to keep a reminder of her, but seems than rather keeping that, you'd give it away. The bracelet hit Deku's chest before he fell down in anguish.

"U-Uraraka...! You... You bastard!" He glared at you as you just tapped the ground. The ground started to shake as you shifted the tectonic plates in the ground, allowing for a massive earthquake to take hold. He rushed toward you with black whip. You looked at Shigaraki.

"Do you want me to end this?" You asked as he nodded.

"No point in keeping them around. Kill them all." He said as your eyes glowed yellow. You gained a smile as you used Mt. Lady's quirk and gained in size. You scaled over the hero and smiled.

"Decay, before creation comes destruction." You say as you slam your fist in the ground, leveling the city and the pro heroes, as decay spreads through the remaining city. "Should have called it Almighty Push."

Soon, there was nothing left but ruble. You were seen standing over a body you saved, and took something from it. Shigaraki looked at you.

"You ready to go?" He asked as you smiled and turned towards him.

"There's something I gotta do." You said. Time passes as All Might looks at the news, terrified that not a single survivor remained... that none of the U.A students survived. A knock came at the door in his office. A figure opened the door and passed All Might something. He quickly got it and noticed what it was. "Hey. I figured out of everyone, you should have that. I figured I'd give his heart to his mother."

It was Deku's mask. All Might glared at the figure with tears in his eyes as he left. You are seen smiling in the night sky, taking in the air. Toga and Dabi land next to you. Toga smiles. "You ready?"

The city is shown burning with black and blue flames as the villains run amok. No more heroes to save Japan. No more obstacles in your way. You smile and leap down from the perch with the others. "Yeah, I'm ready."