(Edited version)

All for one.

Nobody really knows much about him any more. When Quirks were new to the world, he was quite famous. He had an enormous influence in the quirk community early on. He was practically the Al Capone of the quirked crime syndicate. Eventually, he fell from the forefront of the public eye. As far as the general populous knew, he was a story. But even though he had already lost almost all of his following, he never gave up on his plans.

Eventually, he realized that taking quirks from people was fruitless. He needed something much more...

Thus, All for One launched a new phase in his plan. He would use his memory alteration quirk on 'promising' women. He needed to spend an extensive amount of time with them for the quirk to properly work. One such woman was promising in the way that she was able to move things with her mind. Her name was Inko Midoriya. If she were aiming to be a hero (or a villain), she could have easily used her quirk to do great things. The next phase of this plan was to alter her memory and insert himself into her life. Become someone she trusted. Once he spent enough time with her, he need only bide his time until he could sire a child for his... "Quirk factory."

By having children with women who could birth a powerful quirk suitable for him to take, he could actually get something done. The mediocre quirks he had been assimilating the last few decades were lackluster, to put it lightly.

You can imagine his surprise when his child was born, and things didn't go according to plan. Not only did his child not have a quirk at all, but All for One felt... Love.

When All for One set his eyes upon the beautiful human he had created, and the beautiful human he had created set his eyes upon All for One, the malicious mindset he had dissolved instantaneously.

"Izuku." She said.

At the time, for the purpose of hiding his true identity and intentions, All for One was using the name Hisashi. He was posing as a poor man from a poor family, so he took Inko's family name in the memory he created for their wedding. This worked in many facets, as this would also avert any prying eyes from Inko's friends and family who didn't know 'Hisashi' existed.

"What?" All for One snapped back to reality at the voice of his "wife," Inko Midoriya.

"I want to name him Izuku. Izuku Midoriya. Don't you think that sounds wonderful?"

Yes, it did. "Yes, it does."

All for One was frightened by his own reaction, and surprised by the fact that he found himself agreeing with Inko. He was supposed to be a hard criminal. He needed to execute his plans. This woman was a tool! A necessary means to an end, a single step on the stairway to domination.

All for One left the room to clear his head. Gathering his thoughts, All for One thought to himself.

"I know for sure that I'm not going to abandon my plans. Not after I've come so far. Even though this child is a failure, I can always try again. But... I don't want to do this again. I may lose sight of my own objective, considering my feelings upon looking at my very own child. I need to leave this family. Yes, and if, in the future, I decide to sire myself a new child, I might actually be given a child with an amazing quirk. One thing is for sure: this child needs a quirk. Right, I will give him something to live with. But what?"

Reentering the room, 'Hisashi' said, "Inko. I just got a call from work. it seems that I'll soon be traveling quite frequently. I'll probably never see you and little Izuku."

Inko looked dismayed. "Can't you turn it down?"

"No, this has been a long time coming. If I do, I would certainly be fired. But don't worry, I can still send you money while I am away."

Inko gazed at her son, her eyes showing happiness at her son. Meanwhile, her words showed sadness, "I wish you wouldn't. I want him to have a father growing up."

All for One felt a tug at his gut. Was he on the brink of crying? "I'm really sorry, honey. I need to leave soon, so I'm going to start packing tonight. Can I hold him? You know, to say goodbye?"

Inko smiled, "Of course, he's your son, after all."

All for One took the child from Inko's arms. He lost himself in the newborn's eyes. They were green, like his mother's. All for One turned and whispered, "Hey, little guy. It's your daddy. I know you won't ever remember me, and I do regret needing to leave so soon, but I will be there for you at some point in your life. Of this, I have no doubts. But I can't reject my principles and leave you quirkless. So I'm going to leave you with a gift. From me to you."

All for One remembered every time he'd transferred a quirk before this. His little brother stuck out in his memory more than the rest. This child reminded him of his brother: small, quirkless, helpless. All for One prayed that his son wouldn't walk the same path as his own brother had; He didn't want to make an enemy of his own son. All for One also remembered that oftentimes, a person who acquired a quirk could go brain-dead easily. The wide-eyed expression of emptiness never bothered him until he imagined the same expression on Izuku.

All for One kissed Izuku gently on the forehead, silently transferring a quirk to his son. Slowly handing the little one back to his mother, he felt another tug at his gut. His heart pounded in his chest. All for One turned around and, with tears in his eyes, left the room. Not another word was spoken, and Inko never saw him again.

Yeet.

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