So this was a challenge posted by the author One-Shot King Z. So I decided to give it a shot, sorry about how late it is I accidentally deleted the original file and had to rewrite the whole thing.
The term monster is often used to describe something that is thought to be genuinely evil. An example of this would be if a man murdered a child, then he would be a monster or a creature from your nightmares might also be seen as a monster.
And in a world full of quirks there were more than a few that could be said to be monstrous.
Acidic blood ran down Midoriya's arms in streams, dripping onto the asphalt and melting away at the once paved road. His chest heaved with each shuddering breath, and he couldn't see anything through his fuzzy vision.
His skin was covered in black plates that glimmered under the street lamps. He wanted to run, wanted to hide, but above all else, he didn't want to be a monster anymore.
He was four years old when his quirk had first started to develop, at that time his once best friend was bullying him. He remembered the explosions more than anything.
The boy's had started to throw rocks at him, the sharp edges slicing into his arms and leaving jagged wounds that would eventually turn into deep-rooted scars.
But just as suddenly as the barrage had come, it stopped.
He looked around to find the source, perhaps one of the adults had come to rescue him? It seemed unlikely, but it could have happened.
No there was no one else around.
Then the screaming started.
He had stood up to help the boy as he withered on the ground, the flesh on the tips of his fingers beginning to melt off the bone.
He tried to reach out, he wanted to help, yet the screaming only grew louder.
It was on this day that Midoriya had learned the definition of the word monster.
And he fit it all too well.
It had been his quirk that had caused the damage. His blood was coming out in a thick green slime that seemed to be acidic in nature. It had melted the very skin off of his assaulter.
They had simply claimed it as self-defense.
They had put his quirk down as "Acidic Blood." It allowed him to melt through just about anything.
His mother, despite the situation, had been overjoyed at the fact that her child had a quirk.
His father less so.
He still remembered all the yelling that came from their room, claims of an illegitimate child.
He remembered the day his dad left, breathing flames at birth him and his mother.
His mother had been lucky to escape them; he had not.
Burns left a permanent mark down the side of his face and body. They still hurt to this day.
His classmates called him a monster for what he had done, his once best friends had claimed that he was nothing but a freak and a soon to be villain. He wanted to die, so, so, many times.
He had always wanted a quirk, but now that he had one, he was sure all he wanted was for it to be gone.
He still tried to be a hero though, helping people whenever and however he could, to those he didn't know him, he was a saint, to those who did he was but a wolf disguised as a sheep.
When he reached the age of seven, his quirk evolved for the first time. He remembered waking up in the morning to do his daily routine, yet his footsteps seemed heavy.
His vision was dark, yet he could see every little detail.
His skin coated in a black scale like armor, he screamed when he finally found a mirror, he hadn't been able to see his reflection, but somehow he knew what he looked like.
His screams sounded like a terrible screech that echoed throughout the house. It was the cry of a monster.
A long whip-like tail hung freely from his body, sliding along the ground.
And then the voices came.
His cries of dread and fear changed to wails of agony as the thoughts of others entered his head. He could hear them, his queens. Every fiber of his being wanted him to run and find his beloved queens, he needed to protect them, that was his job, he needed to care for them, to be there for them.
But that would have to wait.
He didn't know where they were, and the voices only told him so much.
Midoriya's mind felt like it was melting, thoughts that were his, yet not his, circled in his mind. They hurt, the voices hurt.
His body had returned to normal, and he had left the house. He knew his mother would be furious, but their home felt too small now. He wandered around the town, the sun hanging high in the sky, and he had plenty of time before his mom got home.
The park, the park seemed like the right place to go to ease his mind, and the voice inside his head seemed to agree.
He had visited this park many times before with his family before his father left.
He had always enjoyed the relaxing atmosphere that came with it; the fresh air of the outdoors would help clear his mind.
He was at peace for a while, relaxing under a tree and simply reveling in the pleasures of the birds.
Then his instincts went wild. He felt like they were clawing at the very fabric of his being, every part of his consciousness telling him he had to protect her, yet he didn't even know who 'she' was.
He glanced around in a near frantic state trying desperately to find what had caused his severe discomfort.
Then his eyes locked onto her, pink skin glittered in the sunlight, and her bubblegum pink air seemed to fit too well.
But that wasn't what had caught his attention.
It was the fact that she was hanging off the side of a tree branch, her grip slipping all the while.
His body moved, sprinting towards her, morphing into his xenomorphic form before he even realized it. His front dropped his hands connecting with the ground as his body changed.
He ran on four legs across the ground, lean, powerful muscle trampling the ground underneath his legs.
Her grip finally failed her as she fell, and life slowed down for him. He leaped grabbing her and curling his body under her as they tumbled across the ground.
Mina looked up into the black plated face of the monster in front of her; she knew the creature well; after all, they were her favorite.
It has smaller than it had been in the movies though, maybe it was still young?
The real question should have been why did it protect her?
She remembered that in the movies that all the Xenomorphs had wanted to do was harm people, and they were the bad guys. But this one protected her. Why?
She reached a shaky hand towards the aliens head, felling the slick black surface of his plated skin. It seemed to relax under her touch, leaning forward into her fingers. It's glossy surface felt cold under her warm palm.
She felt relaxed in its presence, and she was sure it felt the same.
"Mina! Mina where are you, sweetheart?!"
That was her dad's voice calling for her; it was probably time to go home. Her head turned as she saw her dad approaching, and when her gaze returned to the alien, it was gone — disappearing into the treeline.
Her dad approached her, scooping her up in his strong arms.
"Mina, what were you doing over here?"
She looked at his face, before the biggest smile she had ever worn appeared on her face.
"I was playing with an alien."