1 Chapter 1 : Origin

They say the power doesn't make the man, it is how it is used which decides who they are. It was the biggest lie the world has ever told. People are unaccepting of the unnatural, grotesque, shiver inducing. How you look and how your quirk functions determines how you are perceived. If it is similar to heroes of legend then you are treated as their second coming, but if it requires the pain of others or has been used by the evils of old, you are looked at with fear, jealousy, and contempt as they look for every sign you may become what they most dread. 

"Your quirk is quite amazing young man. You'll be a great hero in the future." Dr. Tsubasa said proudly while ruffling Izuku's head.

Izuku looks up in excitement as he is in his own head wondering what quirk would bring such reaction from the doctor.

"What is his quirk doctor? Inko ask curiously.

"Well his quirk allows his body to mutate to defend itself from harm, it also allows him regeneration which I believe will continue to grow as he ages. He'll be unstoppable if he is exposed to the right stimuli for long enough." 

As the doctor is saying this, he tries to use the needle to he had used to take Izuku's blood, the needle bends as it tries to pierce his skin. The doctor then tries other areas of the body the result remains the same.

"Mom, can I tell Kacchan tomorrow? Izuku asked excitedly.

"Sure, thank you doctor." Inko and Izuku then left.

"No problem, Ms. Midoriya" Dr. Tsubasa replies.

As Dr. Tsubasa sits there he sighs and goes to the lab to study the blood sample taken from the boy. As he sat down at the desk he notices the sample seems to be discoloured. Perplexed he decided to pour a small amount into a petri dish.

 As soon as the blood hit the glass it dried. The doctor took the dried sample to a microscope and began examining it. It looked just like normal dead blood cells. The doctor looked over at the remaining sample in cold storage they were all dry and dead. 

'Damn, this would have been a great break through in the project'

'Maybe not all is lost.' The master may find great use for the boy'

Outside

As Inko and Izuku left the clinic and got in to their car, Izuku excitement wears off and he notices a small letter icon with a red dot on the corner in his peripheral vision. Izuku focusing on it causes a text box to pop up.

Adaptations

- Heightened Mental Acuity

- Cell Longevity

He didn't really understand the words shown to him so he asked his mom.

"Mom? What does 'ah-cu-i-twe' and 'lo-gu-e-vi-ti' mean?

"Wow those are big words. Where did Izu hear it from?

"It says it right here"

Izuku points at the air right in front of him. Seeing this worries her.

'This must be from his quirk. I should get a second opinion'

"That's great Izu. That first word is 'a-cu-i-ty which means how good you are at someting. The second word is 'long-ge-vi-ty' which means how long things last for or how long something lives.

"ohh"

"Izu do you want to go meet quirk doctor to know what you're quirk actually does"

"ok"

The ride home continues in silence with Izuku imagining what his quirk could do and how he'd be just like All Might with it, while Inko was worried of what this quirk has in store for her baby boy.

When they got home Izuku bolts towards the computer. Inko sighing knew exactly what he was doing. Watching his favourite video of All Might's biggest rescue.

Inko then puts away the groceries and began doing some chores around the apartment. She was walking past the computer room, she expected to hear the awe inspiring voice of All Might but she heard the sounds of quiet mumbling.

Inko peers into the room to see Izuku reading an article. She stood there for a minute as Izuku seemed to not understand something and opened a new tab to search for it.

"Izu what are you reading?"

Surprised Izuku suddenly jolts up, his knee hitting the underside of the table. He seemed to not notice this as he turns towards his mother.

"I-I wanted to know more about the words I saw."

Inko looks closer at the article. It was about immortality quirks and how they would hypothetically work to keep a person alive for a long period of time and on the other tab was the definition of biological immortality.

"Izuku can you please tell me what words you see exactly."

Izuku then recites what he sees word for word.

'Heightened mental acuity and cell longevity, do these only words appear after he is hurt? Then why there is no piercing resistance after not being harmed by the needle. There must another reason he gains these "adaptations".'

"Ok honey, let's go to that quirk doctor tomorrow after school ok?"

"ok"

"Alright, do you have any homework to do? You have been sitting here a while."

"Oh there was some"

Izuku quickly runs off to his school bag to get his supplies. Inko having carefully checked on Izuku's knee while they were talking knew he was fine. She has a look under the desk to see if there was any damage. There were scuff marks and a slight dent on the underside of the desk. It looked like someone lightly took a mallet to the desk.

'I guess I don't need to worry too much about him getting hurt though Izu not noticing he was hurt might be a problem.'

Meanwhile

An old bespectacled man can be seen passing through a dark purple fog into a lab. Walking to an office he knocks lightly to pronounce his presence.

"Come in doctor."

A cold yet familiar voice calls out to the old man.

"Yes master, sorry for disturbing your rest at this hour." 

The door opens to a large office. A large desk in the middle and an arm chair to the side. A white haired man is seated in the arm chair wearing a white dress shirt with rolled up sleeves along with dress pants and shoes. His jacket hung around the office chair at his desk. The man sets down his wine glass on a table to the side and looks toward the doctor.

"No worries old friend, take a seat and tell me of what have you learned that needed my urgent attention."

"It was a quirk sir. I believe it will be of great use for the inevitable battle with your nemesis."

"Oh it must be amazing for you to come here personally to inform me. Do tell me what is it."

"It is a mutation quirk allowing the users body to adapt to any harm that comes to them eventually immunity to such harm."

The younger man shivers in excitement.

"Oh doctor you've outdone yourself, I trust you were able to get samples of their blood for the nomu project."

The excitement on his face fades as the doctor shrinks away in shame.

"Unfortunately sir, there was some complications. It appears that the quirk has countermeasures against it's cloning. The samples die within minutes in the bags but exposed to air it dies immediately. The dried blood appears as normal dead red blood cells."

The two men sit in silence planning their next move. The younger man speaks.

"Have your personnel monitor the child. We will retrieve it when the time is right"

"Yes master it will be done"

The doctor leaves leaving the man to his thoughts.

'A great tool for both good and evil. An unstoppable, immortal being immune to all the harm you can dish out my nemesis. It will be a great day as I watch you fight an unwinnable battle and perish at my hand at the grand stage of the whole world.'

A whitish blue haired child peaks through the door.

"Sensei was that the doctor? Why was he here this late?" 

The man looks at the child with a fatherly gaze.

"Nothing to worry about child. The end of the legacy of All Might draws near. You should go back to bed." 

"Yes sensei" the boy grins in excitement.

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And that's it for chapter 1. Tell me what you think in the comments on this chapter.

Next time

Chapter 2 : Friendships?