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Language:
English
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Published:
2024-03-14
Completed:
2025-10-05
Words:
152,292
Chapters:
59/59
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870
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The Erasure Hero: Null

Summary:

Inko wanted a baby, but Hisashi couldn't have one. So, she went the artificial insemination route.
Aizawa Shouta donated sperm to afford that month's rent after graduating U.A.
Izuku gets an overpowered erasure quirk, Aizawa's genetic issues and an angry Inko.
The HPSC want a new child soldier, AFO wants Erasure, the Shie Hassaikai and Hamarise want an 'ingredient', the MLA want to destroy a threat and Aizawa is yearning for a kid of his own.
Izuku is hiding his quirk.
What could possibly do wrong?
OR: Izuku is Aizawa's biological child and running from almost every villain organisation in Japan. Watch as he winds up at U.A and starts on the path to become the Eraser Hero: Null!

Chapter 1: For Want of A Child

Chapter Text

Inko sat in the hospital waiting room with a massive smile on her face.

 

This wasn’t the most reputable hospital around, but they had the lowest charge rates for artificial insemination in the area.

 

She’d rushed over as soon as they called. They’d found someone that matched her preferences fairly quickly. She heard it could take weeks, but it barely took three days!

 

Then again, all she’d asked for was for was someone with rather recessive genes from the ‘specialty’ quirk list. In other words, sperm that would allow the child to be mostly like her but with a strong or useful quirk, just in case. She also asked them to make sure they didn’t have any major genetic illnesses. She didn’t want a sick baby, after all!

 

She also figured that if she had a child that looked like her, with a strong quirk as well, maybe Hisashi wont be as upset with her for making such a big decision without him. She really wanted a kid and Hisashi never said whether he did or didn’t, just that he physically couldn't have one.

 

She’d figured it was a sore subject and left it be, but now she wondered how he’ll react to her decision.

 

“No, it’ll be alright. Even if he isn’t excited as I am, I’m sure I can convince him to let me keep it…” Inko muttered.

 

“Inko Midoriya?” one of the doctors called.

 

She rushed over, happily sitting in one of the patient chairs.

 

“Alright ma’am. As I’m sure you heard over the phone, we were able to find sperm matching your preferences. We found someone with a specialty quirk, highly recessive genes, and minimal genetic concerns. They’re a Japanese citizen, black hair and black eyes. Only recorded genetic illnesses are insomnia and migraines. Does this sound alright to you?” the doctor offered, reading off of the clipboard he carried in.

 

“Hmm. Does it say how bad the illnesses were?” Inko asked. Insomnia can be dealt with easily, the migraines can make people really sick and she wouldn’t want that for her baby.

 

“Only that their severity is influenced by environmental issues. Noise, stress, diet, etc.” the doctor explained.

 

“Hmm. In that case, we just need to avoid whatever triggers it… Alright, I’ll go with them,” Inko muttered, speaking up towards the end.

 

“Great! In that case, we just need to book in an appointment!” the doctor cheered.

 

“Huh…Well, that’s convenient…” the doctor muttered after a few moments of clicking around the screen.

 

“What is it, doctor?” Inko asked, confused.

 

“Tomorrow’s lunchtime booking just cancelled. It’s very rare to have full cancellations for something like this…” they mussed.

 

“I’ll take it!” Inko cried happily, practically vibrating in her seat with joy.

 

The doctor just chuckled and made the appointment.

 

 

*                              *                              *

 

 

Dinner time the next day had the Midoriya family’s nosy neighbours peaking out their front doors or holding their breath and straining their ears.

 

Never before had they heard such a loud argument between the loving couple next door.

 

One of them could have sworn they heard something about a child, another said they heard something about the sketchy local hospital – the one that dared to put sperm donation flyers near high schools – but they all concluded that whatever was going on, Hisashi was furious.

 

Not an hour after the shouting died down – Inko’s crying still ongoing – the man burst out the front door, suitcase in hand. His face was read with rage as he stormed out of the apartment complex, muttering something about hating whiny children.

 

The man was never seen again.

 

 

“Don’t worry, baby. Mama still wants you, even if she won’t have a papa to raise you with,” Inko whispered into the night, tears still running down her face. She’d love them, even if they took her everything from her.

 

 

Nine months later, a young boy with dark green hair that faded to black at the roots was born. His green eyes shone like emeralds and freckles formed diamond on his cheeks. Inko named him Izuku.

 

 

*                              *                              *

 

 

(Four and a half years later)

 

Izuku was happily running around the playground, rugged up in winter gear and swinging around his newest All Might toy. The other kids giggled and played with him, using their own toys as the sidekicks and villains of their make-believe story.

 

His mother was chatting with one of the elderly neighbours again, not watching as Izuku ran face first into someone’s chest.

 

They had several different handbags and backpacks swung over their shoulders and a scowl on their face. They smelled horrible.

 

Quicker than he could react, the villain pulled him up and pressed a knife-hand to his throat.

 

The man glared at the local heroes as he spoke.

 

“Leave. Let me go, or the kid dies,” he snarled.

 

The other children screamed and ran to their parents, who quickly left the area.

 

Panicking, Izuku tried to pull at the hand near his throat. It didn’t budge.

 

The heroes were just standing there, talking to their comms. Slowly, his body started to feel like it was burning up.

 

Minutes passed, the villain slowly starting to back away with Izuku and the discomfort stopped.

 

Instead, a steady warmth pushed out of him. It rapidly expanded, Izuku able to sense every person in its range. A golden circle marked the ground where the warm aura stopped.

 

Looking at it curiously, Izuku realised that everyone had stopped using their quirks. However, he also realised that he was really tired, and his eyes hurt.

 

The man behind him had a cold aura in his centre, and something in him told Izuku that he could get rid of it if he wanted. But it seemed to be part of the man, so he left it be.

 

Instead, he closed his aching eyes; completely unaware of the red glow they were emitting.

 

He was equally unaware of the heroes outside the circle regaining their quirks.

 

 

The villain panicked when the heroes’ quirks returned and his didn’t.

 

Dropping Izuku, they turned around and ran towards the back alleys in hopes of losing the heroes.

 

Immediately, all but three heroes gave chase. The remaining three worked together to sooth a shocked stiff Inko – whose tears had stopped the instant the golden ring appeared – and hall the paramedics for Izuku, who still hadn’t gotten up from where he was slumped on the ground.

 

Izuku’s panicked breathing was the only reason they knew he was still conscious.

 

As for Izuku, his panic was over the shear exhaustion he was feeling. He was well aware it was because of his quirk – and wasn’t that a shock, he finally had his quirk! – but just because he knew, it didn’t mean he could make it stop. In fact, the more he panicked, the more his quirk seemed to react; drawing more energy and getting even stronger than before.

 

Slowly, a newer hero with a bull mutation quirk crept closer. They were the only one not effected by the quirk. Or so they thought.

 

Everything was fine until he grabbed Izuku, completely unaware that the boy’s body was emitting a second, much stronger erasure field. It was skintight and there was no glow to be seen.

 

Izuku watched in horror, screaming, as the hero’s quirk – which made up more than 50% of their DNA – was erased. Izuku’s quirk was a true erasure; able to erase and quirk or quirk effect in existence.

 

He watched as fur, hide, hooves, horns, muscles, ears, skull and more simply disappeared from the man – and that was only what he could see. He watched as their body fell lifeless and bloody to the floor. Distantly, he could hear the cries and screams of his mother and the other heroes around him.

 

His vision faded to black, his quirk finally taking the last of his available energy and forcing him the black out.

 

 

Meanwhile, the heroes and paramedics panicked; scrambling to pick up the boy now that his quirk was gone and get him to the hospital. They were shocked to find that quirk suppressants did nothing to stop emitter quirks from failing on contact.

 

Inko was urged to follow the ambulance to the nearest hospital while the heroes called the police to explain the hero’s death and organise the retrieval of the body.

 

That afternoon was a tragedy for everyone involved, and a young boy was left scarred for life.