Hey look at me, writing trash for a new fandom. And tragic OC trash at that? Oh boy oh boy what am I doing. Anyways, this is very summary-esque in terms of storytelling, but it's only the prologue, so the rest will be some of my better work, thought out and shown, not told in full. I just wanted to get this published today because October 13th is the birthday of the main character, Kasha.

I don't own My Hero Academia.

Many are born with quirks, just another way to describe superhuman abilities and characteristics, mutations and adaptations. They have dominated society in a way not seen since the earliest discoveries of mankind. Eighty percent of the world is born with a quirk, twenty percent of those people are not. They are born quirkless. Only three percent of people in Japan are born without a quirk.

In the early years of quirk society, many with quirks used their abilities to commit crime, and some went beyond simple crimes to become truly horrible people: villains. Villains were interested in destroying, remaking, and controlling society. Equally, heroes arose to fight them and to save those who could not save themselves. As the world changed, people did with it, and just as people changed, some things remained relatively the same.

Among the many things about humanity that remained the same, there is one thing that Kasha Yūrei found to be a fundamental truth at the tender age of thirteen.

Some people don't strive for glory, to change the world, be it to save others or harm them. To do anything truly noteworthy. Some people just do things because they want to. And sometimes that means hurting someone beyond what is socially acceptable. Sometimes it means that one becomes a monster, and there is no other reason other than the fact that they like it.

Kasha stared at the man across from her, holding her five year old sister captive. He was tall, in his early twenties with white-blonde hair and dark eyes like an abyss, full of human depravity and bloodlust. He had gaunt features and a willowy form, towering over them both.

Kasha's eyes stung with tears, her body trembling at the knife the crazy man held to her sobbing sister's throat.

Off to the side her mother was dead in the floor, arms and abdomen sliced to ribbons, her house dress dyed red with her own blood. Her father sat in a dining room chair, tied to it, his head was thrown back, and his throat was split deeply from ear to ear, his shirt soaked down the front from when the wound had spewed blood.

Kasha and Kaji had walked into this scene upon returning home, and the crazy man responsible had snatched Kaji away, holding an already bloodied hunter's knife to the five year old's jugular.

He motioned with his head to the knife that was weakly grasped in her dead mother's hand.

"Use that." He said. "Cut yourself."

Kasha remembered that she couldn't stop shaking. She'd been so scared.

She knew right away that the man had made her mother cut herself to death, threatening her father if she didn't.

The blonde man shivered in delight. He rejoiced in her despair, and her fear, and her hopelessness.

"If you don't…" He began menacingly. "Maybe I'll have to have a little fun with Kaji-chan here? She's a little young, but just as sweet and innocent as you down there. So maybe I'll just pretend she's you when I fuck her, and then I'll punch her little virgin body full of holes."

"Nee-chan!" Kaji choked, tears spilling down her face, her cheeks bloodless, silver eyes wide with terror. "Nee-chan please help me!"

Kasha gritted her teeth, wanting so badly to be capable of doing what her sister begged of her. That helpless plea was more than enough. Of course Kasha was afraid, she was more afraid than she could ever remember being, but this psychopath would not touch her little sister.

Kasha remembered thinking that, so she'd gone for the knife, prying it from her mother's cold dead fingers.

Kasha shook like a leaf in storm, and she stared the madman right in the eyes as she held the weapon over her right wrist, fighting to stop shaking.

"Don't you touch her." Kasha growled, seemingly only delighting him more. "It's not her you want."

No, it wasn't Kaji he wanted.

Kasha knew that, because she knew him.

Well, in passing. Kasha wouldn't say she was a good person, just a moderately decent one, and any decent person would help someone else if they had the ability to.

Two weeks prior to the horrible day Kasha stood in her home with two dead parents and her kid sister taken hostage, Kasha had saved the very blonde man that had taken her parents from her from being bullied.

He was a college student that apparently got bullied all the time. Kasha couldn't have known that he was a closet psychopath. She couldn't have known that he was the infamous serial killer The Ripper that was going around the city leaving dead women rended in alleyways in his wake.

She couldn't have known that he would become fixated on her because of her stepping in, and would stalk her for two full weeks. Couldn't have known that he would break into her house and force her mother to mutilate herself in front of her father, and then slit her father's throat after it was "game over". Couldn't have known that he would take Kaji hostage and threaten to rape her even though she was only five if Kasha didn't do as her mother did and cut herself.

No, Kasha hadn't known any of those things would happen.

Even still, she was paying for it.

"If you're a good girl, Kaji-chan can go." The psycho had promised. "Just… just cut. You'll look so pretty Ka-chan, all full of holes, even prettier than your mommy. Don't you think? Haa, just thinking about it gets me excited. I can't wait until you're dyed all red, and then we can have more fun. I won't have to touch Kaji-chan once you're bleeding Ka-chan, 'cause then that's when the magic starts."

Kasha learned that day what hatred was. Not the definition, not the context in which to use it, but the actual feeling of utterly despising someone else.

This scum… this completely irredeemable waste of flesh psychopath had murdered her parents, and was threatening her little sister. He intended to rape Kasha after forcing her to slice herself open. He had already threatened to rape Kaji if Kasha didn't do as he said.

If he thought that he was going to get away with it… he had another thing coming.

Kasha would have her revenge, her merciless justice.

And so, looking her tormentor in the eye, hearing the sobs of her poor innocent sister, smelling the overwhelming stench of her parents' shedded blood, she sliced into her own flesh.

At age fifteen, Kasha Yūrei was well aware of how horrible humans could truly be. She was aware that heroes didn't always save people, and that sometimes one needed to be strong enough to protect what's important to them themselves.

Kasha had not been strong enough to save her parents, hadn't even been aware that she needed to be.

She hadn't been strong enough to keep Kaji's innocent eyes from seeing such horrid things the day their lives changed forever.

But the current her was well aware.

That was why she stood before a large gate, waiting to take the hero exam to get into U.A high, so that she could someday get her own hero license.

Kaji was… gone. Kasha had sent her away to live with their only living relative in Japan. Their father's younger sister.

'Someday... when I'm strong enough, I'll come get you Kaji. But for now... please forget about me.'

Silver eyes stared with false solemnity, and slightly pointed ears listened to the voice of the pro hero Present Mic announce the test had started, and the other teens around her rushed in to snag their chance, the chance to become heroes.

Little did anyone know, Kasha wasn't like them. She didn't hope to be a hero. She simply found the route necessary to gain access to the information networks she needed to achieve her real goal.

"Someday..." She murmured in a solemn tone.

She felt her skin warm as she called upon her quirk.

"Someday I'll find the one who took my family from me, and I will get justice."

Trivia:

-Kasha (火車, "burning chariot") Kasha are a type of bake-neko, or monster cat. They are large, bipedal felines as large as or larger than a human. They are often accompanied by hellish flames or lightning. They often live among humans, disguised as ordinary house cats or strays. However, they reveal their true forms during funeral services, when they leap down from rooftops to snatch corpses out of their coffin, to either animate and use them as puppets, or eat them. (From Yokai(dot goes here) com).

-Yūrei (幽霊, "faint spirit, ghost")