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Hisashi was the name he gave himself when meeting Inko. Soon, he fell in love and married her. She was unaware of his villain life, and he would prefer it to stay that way. But one day he was told great news! He was having a child! Inko was a pregnant!! He was happy, and scared, and worried. How was he supposed to continue his villainy if he was a father? He would just have to take a break! Disappear for a few years while he raises his son! Maybe even teach his son a few tricks! So, he quit his "job" and was a stay at home dad.
When Izuku was born, he had beautiful green eyes and green hair like his mother! Hisashi totally didn't cry while holding his son. He stayed up long nights and changed his diapers, fed him, burped him, loved him. He soon found he was even changing because of his son. His son was so innocent and sweet! He didn't want to corrupt such a pure soul! And the smile!
One day, when his son was a toddler, he met another boy his age. Katsuki. Katsuki had a permanent pout that made Hisashi weary of him being near Izuku. But Izuku absolutely adored Katsuki! Even if Katsuki played hard to get, anyone could tell he had a crush on Izuku. When the boy praised him for every little thing his face would go all pink, then he'd try to be smug and confident, saying "Of course!" Izuku only boosted his little ego.
Hisashi wasn't sure what to do with the information that his son was being crushed on by a boy. He'd heard of the gays before, sure. But he never expected to meet one! Especially so young! Or maybe it was just innocent? Was he looking too into it? Nope. He realized Katsuki loved Izuku far better than friends when he caught the brat kissing Izuku's cheek. Hisashi had to take a few deep breaths.
His son wasn't even five and he was kissing other boys?! His baby boy was growing up way too fast! Katsuki is bad influence! And then when he would glare at the brat, he'd glare back! The audacity! He doesn't know who he's dealing with!! If he knew who Hisashi was, the boy would be peeing himself in fear!
And then his language! Katsuki would use such profane words in front of his Izuku! And scolding the boy just made him stick his tongue out in a taunt. This child is so lucky he's in hiding. Or there'd be a missing child poster everywhere you look with his face on it. And then eventually a body will be found in a dumpster.
Hisashi is very protective! His Izuku is innocent, sweet, perfect! So finally, he gets to talk with Katsuki alone, who, looks bored. "You need to watch your mouth in front of my boy young man." He smiles threateningly. "Or else someone might go missing."
"You don't scare me old man!" Katsuki sticks his tongue out and walks away. Hisashi needs anger management therapy.
When Izuku was diagnosed as quirkless, things went downhill. Izuku cried and cried about wanting to be a hero, which, was a punch in the face to him. But at the same time, it was what all the little boys wanted to be! Hisashi COULD give him a quirk... but he would need to pick the perfect quirk for his son! An overpowered one! He'll have to wait to find one that will work!
Katsuki started to bully Izuku for being quirkless. Oh and that did not sit well with Hisashi. Once again, he had a private meeting with the boy. But instead of simply threatening the boy, he took his quirk for a few days and then gave it back. People thought he just lost control of it and didn't believe him when he said it was stolen. Katsuki quickly realized that Hisashi was much more powerful than him. Not even his own powerful quirk could help him. He stayed away from Izuku for a while.
Years went by and soon Izuku was going to UA?! He can't believe it! Not only did his son randomly get a quirk, but he knows this quirk, too! It's One for All! Of course All Might would pick his son of all people!! Which, he supposes is a good thing. His son got the overpowered quirk, gets to be a hero, and gets his idols attention. Whenever Hisashi meets All Might for meetings, things are always a little tense. All Might doesn't recognize him but gets a bad vibe off of him.
Things are going well for Izuku! Hisashi is proud of his son! Despite the rage every time One for All destroys his son's limbs, he's truly proud of his son.
But things all come crashing down one day. Katsuki. The center of all of Hisashi's troubles! HE CONFESSES HIS LOVE TO IZUKU?! AND NOW THEY'RE DATING?! Inko has to console him, thinking he's upset because they're gay. No! It's not because they're gay! IT'S BECAUSE IT'S KATSUKI! And when Katsuki comes to dinner for the first time as Izuku's boyfriend? Oh the glare could kill. Hisashi didn't let him sit next to Izuku at the table, he sat in between them. Izuku was embarrassed, but it was necessary!! Katsuki looked like he was going to pass out. Still to this day, no one believed him about Hisashi taking his quirk. Not even Izuku. He's in the hero course, now. He cannot afford to lose his quirk again. So he was on his very best behavior.
Izuku made several friends who would come over occasionally as well! Some very polite like Iida Tenya or Uraraka Ochaco. Two very nice friends that he approves of. Todoroki Shoto is a little... iffy seeing as his dad is an asshole, he was worried it would pass down in the gene pool. Luckily, he was wrong.
Overall Izuku is having a wonderful school year! And Hisashi is holding on for dear life as Izuku continues to age and progress. He starts to worry about who Izuku will marry? Will it be Katsuki?! Will Katsuki abuse Izuku?! Hisashi can keep himself up all night worrying about his child.
More years pass and Izuku is a pro hero! Hisashi has decided villainy is nothing compared to being a father and has backed away permanently, cheering his son from the sidelines. He still has some... shady habits. Like the villains who hurt his Izuku always tend to lose their quirks before they go to prison. Or some villains who get away from his son are never heard from again.
He loves his son more than anything! Even if it means having to sit and watch as his baby boy gets married to the troublesome gremlin that Hisashi has spent years trying to chase away. Even if it means he can't do his original goal of villainy. He's plenty happy being a father to an amazing hero!
Now the question is why did he pick Deku as his hero name?!