MHA: I'm Saitama-Sensei

Chapter 1: Toji Yamada

It was a sunny morning in the Yamada household, a peaceful scene of family life, though beneath the surface, a rather unusual dynamic played out.

Toji Yamada, at just four years old, sat on the floor, drawing pictures instead of circles and shapes with his crayons. His movements were deliberate, slow, and thoughtful—like a little philosopher trapped in the body of a toddler.

He looked up from his drawing to the side, where his father, Taro, was lifting weights, sweat dripping down his face as he focused intently.

Toji's eyes narrowed in subtle disdain.

"Old man, why are you even using those light weights? Can't you find something heavier in our gym? Also, stop sprinkling water to make it look like you're sweating and ogling Mom like a pervert," Toji said calmly, his tone devoid of the typical childish enthusiasm.

Taro paused mid-lift, his muscles straining. "Don't accuse me wrongly, Toji. I'm training seriously with these weights. You're a child, so you don't understand. And I can look at my wife however I want."

Taro's embarrassment was evident, but he righteously argued with his son while peeking at his wife's reaction.

Toji sighed, an exaggerated gesture for his young age.

"Who are you trying to fool, old pervert? Do you want me to expose you after recording it?"

Taro blinked, staring incredulously at his son. "Shhh... quiet. I'll buy you the manga you wanted. Don't interrupt my performance. Don't you feel lonely? I'm trying to help you out here."

"Pervert."

Across the room, Yumi, Toji's mother, was busy preparing breakfast, her eyes narrowing slightly at the interaction. She could feel the atmosphere shift, sensing her son's growing disgust with his father's behavior.

"Don't make him feel bad, Toji," Yumi called out, her tone stern but sweet. "Dad is just working hard."

"Right, darling," Taro muttered, his eyes overflowing with affection.

Toji, however, wasn't helping. He wasn't trying to be cruel, but his superior intellect and maturity—far beyond his age—often led to awkward moments where he simply couldn't relate to his peers, let alone his parents.

The dynamic in the Yamada household was both loving and dysfunctional. Taro followed his wife's every command like a puppy, while Yumi's fiery temperament bubbled under her kind surface. While Taro worshiped his wife, Toji, who adored his parents, quietly grew frustrated with his father's foolish, high-school crush behavior. He found it hard to understand their constant need to indulge each other.

At that moment, Yumi glanced at Toji and raised an eyebrow.

"Toji, stop looking at your father like that," she scolded.

Toji instantly froze, his eyes widening in fear. He knew better than to cross that line. When his mother got angry, it was like a volcano ready to erupt.

"Heheheheheh," Taro suppressed his laugh and, sensing the impending danger from his wife, quickly put down the weights and moved cautiously toward his wife. "Yumi, now, no need to get upset—he's just a kid," he said in his usual apologetic tone.

Yumi coquettishly accepted his reasoning.

Toji, already packing his things, loudly said, "You perverts, go find a room already."

But it was too late. Yumi's face turned red, her temper igniting.

"Toji...!!"

"Honey," Taro tried to reason.

"Don't you dare take his side, Taro! You're the one who's been letting him get away with too much!"

While running, Toji sighed again, a long, exaggerated exhale that carried all the burden of a poor child. "No dinner for today," he muttered under his breath.

This usual scene unfolded with Taro scrambling to calm Yumi down, while Toji ran to his room, locked the door, and took a seat at the table, flipping through a picture book like he'd seen it a hundred times before.

In his mind, he was already planning his escape. One day, I'm seriously going to run away, he thought.

---

Time passed, and the important day every child awaited arrived—Quirk Awakening Day had come for Toji.

That night, Toji lay in bed, staring up at the ceiling. He had the same excitement most children felt on the eve of their quirk awakening. Most kids his age would be bubbling with anticipation, but Toji was different. As he closed his eyes, he drifted into a deep sleep.

Suddenly, his dream shifted. The familiar hum of his bedroom faded into an eerie quiet, replaced by the presence of something—someone—unnerving. He felt it before he saw it.

A figure appeared before him. It was both intangible and all-encompassing, shifting and fluid. He knew that figure from somewhere, sometime, but he couldn't quite place it.

Toji blinked in surprise, but the figure didn't speak immediately. It just watched him, silently, as though it was waiting for something—some unknown memory to resurface.

Maybe it's because I'm in a different place... there's no pain, only confusion as I try to process all these memories.

Yes, Toji was a transmigrator. He had now awakened his old memories.

"So this whole time, I've been in the world of MHA," Toji questioned to himself.

"Are you God?" Toji asked, his voice barely a whisper. It was clear he wasn't scared, just curious.

The entity chuckled, a sound like the wind rustling through trees. "I'm here to offer you a choice. A chance to live... differently. Do you want to try?"

Toji furrowed his brow, his mature mind already analyzing the situation. "A choice? What kind of choice?"

The entity didn't answer right away. Instead, it spun an invisible roulette wheel, its fingers tracing through the air. "You can live a normal life in this world, without a quirk, or gain a power far greater than most, with a price to pay."

Toji's eyes gleamed with intrigue. MHA is a world where even heroes are slaughtered like pigs, so as a quirkless person, I have no future...

But his response was devoid of the usual childish enthusiasm. "What's the catch?"

The entity's form flickered, as if smiling. "The price is a bit troublesome, but only after you choose the power."

"But remember with greatest Power comes greatest penalties!"

Toji slowly walked closer to the roulette. The options were blue. He gave it a mental command to spin.

The roulette began to spin faster and faster, then slowly began to slow down, finally landing on...

A symbol of overwhelming power—an emblem of Saitama, the hero who would never age, never show emotion, and yet was capable of defeating any opponent with a single blow.

"One Punch Man."

Toji was ecstatic. He even thought this might be a dream.

"A power, but with a troublesome penalty," the entity nodded as it said.

"As for the downside, you'll need to unlock your true potential by yourself by surpassing yourself. Ten stages.

You must pass ten trials. Only then will you fully acquire the power. But by the end, your appearance will change. You will lose all your hair, and your emotions will become... dulled."

So I'll become an emotionless monster? Toji inquired.

"No, you'll become a NEET."

"...?"

"Well i don't want to turn the planet is mush when you get excited or angry. As for your daily life,you will find something for you to love.

"Now, as for the next event, you have to choose your role. You can be a hero, a sidekick, or remain an extra.

Choose wisely."

"Every option has its perks and limitations."

"If you choose the hero role, you will bear the fate of the world and others. The difficulty of passing the trials will increase, but as an anomaly, your chances of dying are high."

"Then there's the sidekick role—moderate difficulty, various chances to die. You can also betray or kill the protagonist in this role."

"Lastly, the extra role. You'll be treated as an extra, and if you try to play hero or sidekick, you will be penalized."

"If you ever want to change that situation, you can just kill the protagonists."

"Extra" Toji repeated, blinking. He had no interest in being the center of attention or a hero. "I'll take the extra route."

"Very well," the entity said, its voice almost pleased. "A life lived on the sidelines, yet with power beyond your wildest dreams. It's a strange path, but it will be yours."

"The entity reminded him, Never change the fate of this world. "

Toji nodded, satisfied with his choice, before everything went dark.

But before it all ended, Toji noticed two things:

First, the entity reminded him not to change the fate of the world. That meant, no matter what, Izuku had to defeat All for One and has lose his quirk. The world would regain peace.

Second, he had to remain an extra.

A hero is someone who, with their companions, fights villains. As for his comrades—they're sidekicks. The rest of the population are extras.

Just like Bakugo thinks.

This is going to be fun.

Toji noticed these two things, but he didn't realize the remaining three points:

First, he was destined to inherit Saitama's power, so no matter what he did, he would eventually become a NEET.

Second, the roulette options were hidden, but if he had looked closely, he would have noticed that all the options were the same.

Third, fate was never as simple as it seemed. It was far more mysterious and powerful than time. From the moment he was born, the wheel of fate had been set in motion. Only the wheel of time could show the future.

And the entity already knew this ,as for why he still reminded toji.

"HOW CAN I KNOW WHAT GOD THINKS,FIND IT YOURSELF"

---

The morning came normally, and with it, Toji woke up feeling like a completely different person. His body felt different, and so did his mind.

His emotions, normally present in some form, were now strangely absent. He felt... calm, unnervingly so. His expression, usually an open book of emotions, was now as flat as the face of a doll.

Taro and Yumi immediately noticed the change as soon as Toji entered the kitchen. He was the same little boy, but his eyes no longer held the same spark. His smile, if it could even be called that, was far too passive. He spoke in his usual voice, but there was an oddness to the way he carried himself.

"Good morning, Mom, Dad," he greeted them, but it lacked the energy it once had.

Yumi's eyes narrowed. "Toji, what's wrong? Why are you so... quiet today?"

Toji simply shrugged, his shoulders relaxing in a way that seemed too practiced for a child. "I'm fine, just excited, really."

Later At the doctor's office, Toji sat on the examination table, his legs dangling off the side. The doctor, a middle-aged man with round glasses, scratched his chin after scanning Toji's charts.

"Hmm, well, it seems your son has a very unique quirk," the doctor said, his voice tinged with surprise. "Based on his physique and overall health, it's likely an enhancement-type quirk. His abilities are a permanent boost to his strength and endurance, and he's not actively using any special abilities. It's... actually quite rare."

Yumi and Taro exchanged excited looks. "What do you mean by enhancement?" Yumi asked.

The doctor frowned. "Well, that's the thing—his quirk seems to affect his body passively. He doesn't have to activate it, so it has far less potential.

Entity: Kidding, of you have powerful quirk how can you be treated as an extra

"As for bad news , his emotions, they're being affected negatively.

Sorry to inform you, Mr. and Mrs. Yamada, but your son's quirk is making his emotions duller than normal."

Toji barely reacted, though part of him felt like he was finally free. But for his parents, it was a different story. Their son's emotional detachment weighed heavily on their hearts. They didn't fully understand it, but they tried not to let it show.

As they left the clinic, Toji quietly watched his parents, their loving, dysfunctional personalities still intact. But for him, nothing had really changed. He was just... different now. A little bit stronger, a little less emotional.

And in a way, that suited him just fine.

In the future, he would surely regret his words.

As they drove home, Taro turned to Yumi with a soft, uncertain smile. "Maybe... we should give him some space today. Let him get used to the change?"

Yumi nodded, though she couldn't quite hide the concern in her eyes. "You're right. We don't want to make him feel worse."

Toji, meanwhile, stared out the window, lost in thought. As the car drove down the familiar street, he couldn't help but think about his future. He was no longer just the quiet boy who loved to draw and fight with his father.

Now I'm a not that snortty brat anymore

As for the future? Let it wait. Now it's training time.

**

A/N; MelCow!