PJOxBNHA. Inspired by FMAB and Izumi Curtis. Percy is transported to the future thanks to Kronos and enters Hero Society. He misses the canon plot due to hero work, but enters after Overhaul being the adoptive father of Eri.

Stay at home Dad

The resident students of class 1-A were gathered in their home room after the work study programs where Midoriya and Co. rescued Eri, Sir Nighteye died, and Mirio lost his quirk. The cultural festival had passed, and they got to make Eri smile again.

However they were all gathered because it was rumored that 1-A had a guest lecturer in the morning while 1-B would have the same lecturer in the afternoon. Nobody had any idea who it would be, but they were exactly complaining.

Of course, all thoughts halted when an impressively tall man walked in with a familiar little girl on his shoulders. The man himself was easily 6'3 with abyssal black hair blown back by a non-existent wind. His frame was lithe and no doubt built for speed and power.

The other thing the heroes in training noticed right away, were the scars that lined his arms; more than even Midoriya had.

Despite all that, his sea-green eyes were filled with mirth and his lopsided smile put everyone at ease.

"Finally, you're here," Aizawa stated in his patented monotone voice. The man just laughed.

"Good to see you too, Eraser!" the man exclaimed as he lifted the girl off his shoulders and set her on the ground. Immediately, she sprinted toward the homeroom teacher and glomped him in a big hug.

"Uncle Shota!" she exclaimed as he caught her. Most of the class was caught off guard by the gentle smile on their sensei's face.

"How's my favorite little problem child?" Aizawa asked gently, and the little girl smiled brightly.

"I'm good! Papa stopped working so he can spend every day with me! Are you gonna ask Ms. Joke to marry you yet?" she asked with an innocent tilt of the head, making her father, Midnight, Present Mic, Snipe, Nezu, All Might, and the class laugh uproariously.

Eraserhead had the decency to blush and cough out an awkward explanation.

"No, problem child. I'm not sure she's my type," he said simply, but no one was prepared for her next line.

"Oh. What about Uncle Hiza? You love him too, don't you?"

There was a three second pause.

"BAHAHAHAHAHAHAH! MY LITTLE ERI-CHAN IS SO FUNNY! OH MY GOODNESS MY LITTLE MIRACLE!" the man shouted as he cried and laughed and rolled along the floor.

Others weren't too far behind.

Then she noticed Midoriya and her eyes lit up.

"Deku-nii!" she cried and ran to hug him too, getting a tearful smile from the little green bean.

"Who the fu-," Bakugo started to shout, but was slapped so fast he almost didn't realize it. Just as he was about to explode even more, his popping hands fizzled out.

An extreme killing intent of bloodlust and worst centered in on him and made everyone else shiver.

"You will not swear in front of my daughter. If you do, I will end you and no one will find the body," the man said, making Bakugo nod rapidly.

Like the flip of a switch, the man's demeanor changed.

"Excellent! As you know, you have a guest lecturer after Skele-Might's retirement and all that other nonsense you've had to deal with. That's me! Good to meet ya, my name is Jackson Perseus, but you brats can call me 'Percy' or 'Teacher-man'. And I, AM I STAY AT HOME DAD!" he cried in a mock All Might pose.

Everyone took a collective blink while he turned around to Skele-Might.

"Do you see now how ridiculous it looks when you do that, Skeletor?" Percy asked and earned a short of amusement from Eraserhead and a curious look from Eri.

"Who the hel-heck are you?!" Bakugo shouted, but before Percy could answer, Eri interrupted.

"Papa?" she asked innocently with a tilt of her head.

"Yes my little unicorn?" he replied and some of the girls cooed at the nickname.

"Why is that angry Pomeranian not on the leash? You told me that all the doggies have to be on a leash when they leave the house," Eri said and there were three moments of silence before

"PFFTTT!" came from Ururaka and the rest of the room followed up with uproarious laughter. Bakugo had never been that red either in embarrassment, anger, or a combination of the two.

"My sweet little Eri-chan," Percy said with a few more chuckles. "You're right in that all doggies have to be on a leash outside of the house, but that angry Pomeranian lives here at U.A. with your Deku-niisan, so he is technically at his house."

"Mmm. Okay!" she exclaimed while the rest of the chuckles simmered down.

Percy clapped his hands for attention and made everyone jump slightly.

"Eraser, go ahead and take Eri to train her quirk and color. If you want to take a nap, she'll make sure no one bugs you," Percy told the insomniac and heard a "thank kami" as he shuffled out the door.

"Now," before Percy could begin, a hand was raised.

"Yes, spiky ponytail girl?" Percy asked and got a snort from Bakugo at the nickname.

"I'm sorry. Yaoyorozu Momo. Who are you?"

"Sorry Yaoyomomo. Like I said I'm-," he tried again, but was cut off by the resident green bean.

"He's Jackson Perseus! Hero name: Apollyon. One of the strongest water elemental quirk users in recorded history! He came out of literal nowhere from no hero school and got his license at age 17. He climbed the ranks faster than anyone has ever seen and was within the top 10 before he was 20! The only other person to do that was Hawks! He could have easily gotten into the top 5, but with the influx of Japanese heroes he branched out to other countries where he came across a massive contraband operation along the seas in multiple countries that he single handedly dismantled in 6 months!"

"Time out, Foliage!" Percy shouted good naturedly and heard someone murmur "foliage" under their breath.

"Wait. Shrubbery, freckles - well I'll be damned. You're the analysis kid I've heard about, aren't you?" Percy asked with a smirk, making Midoriya blushed crimson and nod his head meekly.

"Tch. Of course Deku's heard of you," Bakugo scoffed.

"Alright, Fanboy. What's my quirk called?"

"Oh! 'Poseidon's Wrath'."

"When did I make my debut?"

"August 18, 2240 which was also your 17th birthday against Blizzard. She was a villain with an ice and snow quirk and she was trying to rob the second largest bank in Tokyo!"

"Favorite color?"

"Blue."

"Favorite food?"

"Your mothers homemade blue chocolate chip cookies!"

Percy whistled in amazement.

"Kinda creepy, but not bad, Fanboy," Percy told him and he blushed again.

"Anywho-."

"Why did you retire?" Midoriya asked, but Bakugo beat Percy to the punch with a snort.

"You retired already? What you just couldn't cut it, you fuckin extra?!"

"I wouldn't call it retirement, so much as prioritizing what's important," Percy answered, confusing those gathered.

"Those of you that were involved in the raid several months ago will understand this better, but after everything Eri-chan went through, she needed constant support more than anyone else. She needed a hero more than anyone else," Percy told them and those involved looked down in remembrance.

"That, and I've wanted to have kids for awhile now, but I haven't met anyone since my late fiancé, so Eri-chan is all I need."

"What about everyone else?" the usual quiet Todoroki asked, making Percy turn to him.

"What about all the other people out there who need a hero? You're abandoning them for one little girl," he finished and Percy just smiled gently at the bi-colored teen.

"I am. Is it selfish? A lot of people will see it that way, but I believe you would do the same as me Todoroki. You, me, and Eri all share a common factor after all," Percy told him and Todoroki's eyes widened slightly in surprise and understanding before returning to neutral.

"So think of it more as a leave of absence until Eri-chan gets settled again, okay?" Percy asked with an eyes closed, cheery smile that showed off his canines and dimples.

"Are you really Top 5 level of strength?" Bakugo asked impatiently, making Percy smirk as his eyes flickered to Todoroki.

"Kid, I whoop Endeavor's ass as a 17-year-old. The old geezer is nothing but hot air nowadays. Hell, I haven't been able to punch someone with my full strength since Spooky Scary Skeleton's over there retired," Percy bragged slightly.

"Seriously?!" Midoriya asked in awe, making Percy smirk again.

"Alright time for a pop quiz of sorts," Percy said ignoring the groans.

"Why do you think my quirk is named 'Poseidon's Wrath'?" he asked and it was Iida who raised his hand.

"Your level of control over water and the effective display you have been known to have!" he shouted and Percy chuckled.

"You're not wrong, but there's more to it. Marimo?" Percy deflected and gestured to Midoriya.

"W-Well, your control is so great that you can calm the seas themselves as well as pull water from the ambient atmosphere and freeze it or turn it directly into vapor for it to remain unseen," Midoriya said but diverged into mumbles.

"That's right! But did you know that I can also communicate telepathically with sea creatures?" Percy asked and Deku's head shot up in amazement before going immediately into a mad scribble in his notebook.

"But wait! There's more," Percy called and everyone looked surprised.

"Does anyone happen to know about what Greek Mythology said about Poseidon?"

Momo raised her hand.

"Yaoyomomo," Percy called on her.

"He was said to be King of the Seas and the Second oldest brother of Zeus. He competed for patronage of Athens with Athena and-," she went to continue, but Percy cut her off.

"That's all true, but not what I was going for. Did you know he had titles other than 'God of the Seas'?" Percy asked with a smirk as he walked over to an empty desk.

When he received no answer, he crouched down and held up his index finger.

"He was also known as 'The Earthshaker'," Percy said casually as his finger started vibrating rapidly with seismic energy and the class went wide eyed.

With a single flick, the desk rocketed across the room, crashed into the wall, and broke apart into thousands of pieces.

Before any of the students could comment, he stood up again and held open his palm. A displacement of air started to flow into his palm quickly followed by water to make dark thunderclouds.

"And 'The Stormbringer'," Percy kept going as miniature sparks of electricity flashed in the clouds like lightning.

He closed his hand and turned back to Bakugo, "so, yes. I'm strong, probably strong enough to take the top spot after All Might retired."

"Didn't you notice how your hand stopped sparking earlier? You have to sweat, right? I didn't let you sweat. I could've made you do the hokey pokey with how much water is in the human body," Percy told them, gaining looks of both awe and fear.

"But I have priorities with Eri-chan. And the ranking system is bullshit anyways. Who cares how many you save as long as you're saving people, yknow?" Percy finished with a shrug.

Needless to say, 1-A thoroughly enjoyed their guest lecturer.