Note:

This is my take if Doom Slayer was transported in the world of my hero academia. I'll be writing the Slayer's epic, brutalist, and violent battles between villains, terrorist, and of course demons. His interactions with all the characters, slow character development, and more. This will be based on the anime of My Hero Academia and manga when the story progresses with more published chapters. Just wanna make clear though, Doom Slayer won't work as a hero. Won't happen, and will never happen. I have better ideas for him. Enjoy everyone.


Rated M for Ultra-violence, Gore, Strong-language, Small bits of profanity.

Genre: Adventure, Science Fiction, Dark, Fantasy, Romance, Sad, Tragedy, Comedy, Friendship, Drama, Alternate-Universe, Crossover.


Against all the evil that Villains, soulless cults, and terrorist can conjure, all the wickedness that mankind can produce, all the great defenders who are in need of help themselves, we will send unto them... only you.

Rip and tear, until it is done.

This is it, the Doom Slayer thought.

All that he had lost, all that he had done to reach this juncture, every single demon he had torn apart with his bare hands, every false god he had transformed into pools of blood through his sheer determination, all that he had sacrificed... everything that he had cherished. It all culminated in this moment.

Upon the Ingmore Sanctum of the once revered Jekkad, the two adversaries stood facing each other, the atmosphere tranquil, the battle concluded. The life force, the very essence of Creation itself, flowed from the Dark Lord in an unprecedented manner as he wearily lowered himself to one knee, his body battered and exhausted, his armor in disarray. His ancient hand tightly grasped his sword of universal annihilation, yet there was an undeniable sense of acceptance in his demeanor.

Opposite the Dark Lord, Davoth stood, his fists clenched but his composure unbroken, a tempestuous storm of vengeance brewing in his eyes as he glared hatefully at the source of his suffering. The mightiest being, the one who had defied death and ascended from the dust to the cosmos, the Doom Slayer peered through the frigid visor of his impenetrable armor, with a serene and righteous fury, the countless ages of torment he had endured flashing through his mind in an instant.

His gauntlet hands slowly and gradually reached for his helmet, gripping the sides of his headgear, and giving it a twist. A slight hiss blew to the side as the pressure seal was broken, and extricated his helmet from his protective covering. The Slayer revealed his scarred visage to another physical being, for the first time in eons; one that he despised deeply. He dropped the accessory by the soles of his boots.

Without his helmet, the Doom Slayer was put to sleep. Now stood a man who hailed the title behind the headgear:

William Joseph Blazkowicz The Fourth

William stalked forward.

Davoth breathed heavily, his will to keep fighting siphoned away from the overwhelming strength of his opponent. He raised his weapon. Clicking his tongue in irritation, quickly realizing it is deadweight, useless in his hand for what was slowly approaching.

It is inevitable, Davoth thought.

"Tell me," Davoth spoke, blood eyes glaring deep into his adversary's. He tossed his mighty sword to the side. "Have you nothing to say to your creator... before you strike him down?"

William glared back, his face contorted into a scowl, his lips twisted by a deep-seated animosity. With one final display of aggression, he bared his teeth, causing the arm-blade to extend with a grating sound. William forcefully thrust his arm forward, driving the blade deep into the chest of the Dark Lord. As blood and energy spilled forth, an unprecedented occurrence took place - for the first time in immeasurable eons, William reacted.

"No."

Withdrawing his arm, he effortlessly dislodged the blade. The Dark Lord emitted a grunt, causing his body to convulse violently; an overwhelming surge of pain coursed through his being. The boundless power residing within him surged and expanded. Tilting his head upwards, the forces of Creation and Destruction erupted from his orifices, manifesting as an immense column of infinite energy that soared into the heavens, unfurling as it reached the outermost boundaries of the netherworld. Subsequently, the Dark Lord descended, and from his chest emerged the First Soul Sphere. Fractured and precarious, it fragmented in a cataclysmic explosion, disseminating potent waves of power and influence that permeated the entirety of the multiverse.

In an endless number of dimensions that had been infected by the treacherous demons, the denizens of Hell crumbled. Back in the Sentinel World, man and woman alike cheered the Slayer's banner as the demons that plagued their world turned to ash. On Earth, an imp was about to pounce on a woman and an UAC soldier, but the vile creature vanished in flames. Countless other worlds saw the end of their plight as the demons were erased from the universe.

The Doom Slayer gazed up at the infernal sky, the cold fury in his heart sated for the first time. For eons he had wasted away, slaughtering every last demon he swore to erase out of existence, living for the sole purpose of tearing Hell asunder. Today, he had taken rightful vengeance against the Dark Lord himself, the ultimate source of his pain. His conquest of Jekkad, his quest for revenge was over. The rage within him settled; he felt nothing but an empty void. What was there left for him now that the True Creator, the Father of All was dead?

It's done, William thought. It's over.

"..."

William slowly glanced from side to side as a wave of exhaustion suddenly washed over him, nausea and dizziness overwhelming his senses. His brows furrowed in bewilderment as he fell to his knees, and he gazed down at his gauntlet hands, perplexed. What was happening to him?

"By his hand, all things were made," the Maykr Father's omniscient voice reverberated throughout the Holy Ingmore Sanctum. "... Even you."

When William heard this, he instantly understood. For eons, his rage was the one thing that had kept him moving forward. Now, without his anger, his body stopped functioning. He was a husk of a human being; a hollow body with nothing to drive him.

In his moment of vulnerability, he stumbled and tumbled to the ground, the floor swiftly rushing up to meet his face. William's world plunged into obscurity. In his final, fleeting instant of awareness, he observed the Seraphs who gazed upon him with an absence of emotion. One Seraph, positioned in the center, elevated his hand, causing the lengthy, stone lid to gracefully slide over him. Darkness enveloped him from all directions.

The sigil above him, a deep crimson hue, served as the sole source of illumination within his sarcophagus.

His eyes grew heavy, and at last, he succumbed to slumber.


Upon opening his eyes, he gazed in awe at the breathtaking sight of the sky adorned in denim hues, adorned with a multitude of stars. Swiftly, he rose to a seated position and cast his eyes about, only to find the familiar landscape that greeted him time and time again. The grass swayed gently in response to a mild breeze that caressed its blades. As he stood upright, he discovered himself encompassed by a vast expanse of grass, some adorned with vibrant blossoms in full bloom. With a mental command, he directed his armor to conduct a comprehensive scan of the surrounding area.

Initially, the scan yielded no intriguing findings: carbon-based life forms, an atmosphere composed of oxygen and nitrogen, and the absence of radio, infrared, or ultrasonic communications. However, the Doom Slayer's armor soon began to provide him with readings pertaining to the more mystical aspects of his environment. No traces of infernal energies were detected, and the atmosphere proved to be remarkably conducive to respiration. A shiver coursed through his body, although he could not precisely discern its cause.

Wait a minute… wasn't he sealed inside of his sarcophagus?

Yeah, now that he thinks about it. Both of his wrists were no longer restrained. Both were free to move and so were his legs. And while it did sound weird to think of such a thing, the fact remains that it was true.

A sudden thought crossed his mind; what is going on? It felt surreal. As if this entire ordeal was an illusion or something. But it can't be, right? The last thing he remembered was fighting against the Dark lord and winning victoriously, after that everything went black. Why am I standing here then? Why am I suddenly out of my prison and back on earth? His mind swirled in confusion as he tried to make sense of what happened.

He'll have to save these questions and thoughts for later. He started forward into the field of grass that surrounded him. He had no clue where he was headed but decided to just go forward regardless. Besides, if he's not gonna find anything out here, he surely isn't gonna find none just by standing around. After all, he doesn't need help from a robot like somebody he knows. With that he continued along through the field of grass.

The grass was thick, tall, and green, which suited a place like this perfectly. He took a few moments to marvel at the view before continuing onward. After all, he has no idea how long he had been trapped in his tomb, nor does he know what caused him to leave said tomb, let alone return home. If anything, he should've stayed in doormat.

He finished it. The demons were gone. He managed to kill all of them. He was able to destroy the demon army and stop whatever plot they had concocted. Humanity can persevere and live to see another day. Now the only problem remaining was finding out where he was, since there were no signs of civilization anywhere.

The Doom Slayer blinked, feeling the earth's floor under his boots quaking slightly. Seconds he felt quaking beneath his feet, followed by an explosion, and a flash of light drawing his head to snap to his left. About a mile from where he stood a massive building fell over, and behind it floated a figure, with another figure standing on a building. He subconsciously ordered his armor to get a better view by zooming in close from his visor.

As his armor zoomed closer the figures began to become clear. Standing on the shorter building stood a very large man with an equally-muscular and well-defined physique, he had chiseled features on his face with a strong jawline, pronounced cheekbones, and bushy eyebrows. A dark shadow cast over his face, however, the Slayer could barely see his deep blue irises filled with fire and anger, His blond hair was short, swept backwards, with two distinct tufts that stuck up above his head, leaning slightly to each side.

He donned a suit that consisted of a skin-tight blue bodysuit decorated with a red symbol that somewhat resembles a "Y", designed with a white diamond at its center, with white lines connected to it that trace from his chest to his back shoulders; the lines trimmed with the aforementioned red symbol. The symbol appeared to have wings on the side that ran from the atop his torso before ending around his back, over which was a similar red and white design absent of the white diamond. Large white patches lined red-covered each side of his hips before ending at his lower thighs, and he wore a gold belt that had a silver buckle with red eyes.

His forearm sleeves were colored in gold that each had white lines covered in blue accents over his wrists, and had spiked fins on the sides of his arms, his feet were covered in shin-length gold boots trimmed with white and red accents.

The Doom Slayer's eyes darted to the floating man. Floating in the air was a man of gigantic stature, who possessed strong, imposing features, short white hair, and luminous red eyes. He also wore a dark suit over a white shirt. His whole body was shrouded in dark red electricity, with black lightning bolts crackling at his fingertips.

Both of their gazes locked on each other, their voices echoing off the metal structures that surrounded them.

Although the Doom Slayer was a bit thrown off when he heard the floating man spoke. It was not of his language but one he was familiar with. They spoke… Japanese? This would've been an issue for anyone besides him if one didn't understand what they were saying. It's a good thing he learned the language by heart, otherwise he would've been stuck in a language barrier.

"Quite impressive All Might, you're a lot stronger than your master was." The floating man cackled, clapping his hands together before bringing them together once again, a small cloud of dust rising. "Though, not nearly as powerful as me." He spoke, his voice rough yet somehow still smooth, almost as if he were breathing oil rather than air.

All Might remained silent, glaring angrily at the floating man above. He stood upright clenching his fist in front of him, his face set in stone, his eyes narrowed dangerously. "Trust to heart All for one, I'm not the same eighteen year old kid you've faced before. Don't let your overconfidence cloud your vision!" His face softened, his narrowing gaze still locked to the floating man's eyes. "Besides…you shouldn't underestimate me…I won't lose, because this time will be different." He stated firmly.

The man known as All for one laughed before throwing his arm down dramatically, "Oh, come now, All Might, we both know what's bound to happen. You couldn't defeat me then, what makes you think you can beat me now?" He cackled mockingly.

All Might's lips curled to a smirk whilst slightly crouching to a battle stance, "You're mistaken my friend."

The floating man seemed taken aback, but recovered quickly. He returned with a smirk of his own, "Is that so… well then, I guess our little warm up is over." He grinned wildly, a crimson aura shrouding around him before a burst of energy exploded around him, knocking All Might back several yards. "Let's get this show on the road shall we?" He roared, before charging toward his opponent.

The ground shook violently as they both clashed repeatedly with each other. Each one gaining the upper hand quickly until, finally, a loud bang echoed throughout the field as All Might sent his fists straight toward his adversary's chest.

As soon as the blow landed, All for one's eyes widened briefly. He brought his arms up to block the incoming force, his arms glowing with a strange energy as he attempted to deflect the blows. At the last second, however, All Might changed direction and grabbed his opponent by the back of his collar, lifting him clean into the air before slamming him hard onto the ground.

Before he could get back up to attack again, All Might's fist crashed into his face, sending the man flying away across the field.

All Might looked towards his foe with a determined glint in his eyes, his hands clenched into tight fists as he prepared for the next round.

"Detroit Smash!" He bellowed, summoning more punches at his opponent, before landing one punch squarely on his chest, blasting him into the opposite wall of the alleyway. The impact threw him completely through the wall before collapsing to the ground below.

All might leap readying to clock him again but before his fist could land, air burst forth through the wall sending him flying backwards into one of the buildings that lined the area. He barely managed to recover before leaping back into action and unleashing his fists upon his enemy. However, this time he was met with only air.

A shadow loomed over him. Right fist swung to hit said shadow but was caught by a glowing hand wrapped around his wrist. "Tsk tsk, you don't know when to give up now do you?" All for one chuckled maliciously while tightening his grip causing All Might's face to twist and grit his teeth. All he did was grunt slightly in response before he kicked the man away and jumped into the air once more, preparing to continue his assault.

Drawing his left arm back, bawling his fist, he bellowed another ultimate move, "Texas Smash!" As he charged forward, the wind around him began whipping up the clouds, causing them to spin faster and faster around him, allowing his strike to reach the floating man even earlier than anticipated.

Out appeared a circular shaped shield blocking his swing, causing a huge explosion to erupt within the blast zone, sending the smoke and debris everywhere. It was only a moment later that the dust settled and All for one was surrounded by his shield he summoned. All Might's breath was heavy, sweat dripping down from his brow while his eyes widened with surprise. Before long All Might raised his right fist ready to punch again, only to see the man disappear from sight. The hero looked around frantically, only to find him standing beside him, staring at him intently.

Before he could do anything, All Might was struck by beam after beam of lasers. Each beam tore through his suit like paper as he flew backwards. Once he fell to the ground, blood began to pour out from underneath his suit. He struggled to his feet, ignoring the agony caused by each movement. He knew that he couldn't afford to waste any time, not when the man who took his master's life was right in front of him.

Just like a bullet from a gun, a laser shot past him in midair, striking his chest directly. He grimaced in pain, falling onto one knee, he raised his right arm slowly and slammed it into the ground. Suddenly he felt a strong gust of wind rush towards him, pushing him back with such strength that he stumbled to his rear end. He grunted as he struggled to get back to his feet.

The Doom Slayer watched the battle from a mile away. Watching All for One continue using his attacks to overwhelm the hero, while doing so using much larger amounts of power, and despite his struggle All Might was still able to keep up. The Slayer's eyes shifted to All Might as he jumped in the speed of sound towards his foe. He folded his arms setting them into an "X" until he reached the first layer of All for one's shield.

"Carolina Smash!" All Might shouted, using the momentum from his movement, he double chopped through the shield's three layers, releasing extreme force from his chop.

The shield shattered into pieces before crumbling away, All for one staggered back from the sheer force that said chop had contained. All Might followed with a series of quick volleys of punches aimed at his opponent, each one coming down like a hammer, knocking him backward, further and further from All Might.

Hands were thrown from the two. Both intertwined tightly, creating a whirlwind with their combined strength, creating a massive cyclone that created massive winds around the area. Every single piece of debris from the destruction had begun to float around them, as if some form of gravitational pull was pulling them in. All Might narrowed his eyes, focused solely on his target and forced himself forward. Finally managing to break free of his opponent's grasp, he ran at full speed toward his opponent.

All for one smirked, raising his arms, a large ball of pure power hovering over his head. All Might slowed for just a split second, but it was enough time. All for one threw the energy ball at the hero causing him to fall backwards, landing heavily on the ground. He coughed violently before slowly getting back to his feet.

It wasn't long before All for one too had recovered, his grin wide and malicious as he approached with ease, a small purple orb forming around his hands. Without warning, he dashed forward sending a torrent of energy toward All Might from behind.

All for one's attack was swift, but All Might blocked it with ease. A bright flash erupted from both of them.

Both men stood facing one another, neither showing any signs of fatigue. After another couple of minutes had passed, All for one spoke first, "Well, I must admit you've definitely improved. I can see why my comrades were beaten so easily when it came to your quirk. I wouldn't be surprised if you were actually a powerful individual, given your physical abilities." He chuckled lowly. "But it matters not. One or another I will take back One for All, but unless you have another move up your sleeve that might stop me, I suggest you use it now."

All Might paused slightly, his expression growing somewhat strained as he considered his options. On the one hand, there was absolutely no way he could take on All for one without using every trick in the book. On the other hand, if All Might used all of his cards he could win. If he could just focus his power on reacting quicker he only needs to predict All for one's movement.

He glanced at his palm. His skin remained untouched and undamaged thanks to the power of One for All. He can't allow this battle to go on nor could he allow his nemesis to escape. He must use his full power and end this fight with one punch. That was the soul birth and purpose of this power.

His mind set, he glared at his foe. 'I haven't fully mastered my new ultimate move yet… but with this, I can end it, with one punch! I will finish what my master started, I will defeat him, because I am the Symbol of Peace and Justice!' He declared in his heart. He then closed his eyes and concentrated his power to the top of his palm, causing his right hand to shimmer with an intense white glow.

The glow began to grow brighter and brighter, until it engulfed the entire area surrounding them.

In that very instant the sun rose above the horizon. Light shining down onto the plaza causing everything to cast a faint white light.

All Might opened his eyes, gazing out at the world he protected: a glimpse of citizens laughing, and smiling. The people he saved. His dear friends. The people who meant the most to him. His Master Nana and Grandtorino. All for one's smile disappeared instantly as he lowered his gaze towards the hero who stood before him, no longer hiding behind his mask and revealing the truth.

The man was smiling at him.

All for one shook his head. "To assume I let you have the chance. You are far too predictable All Might. Just what I expected from you all those years ago.." A slight chuckle escaped him as his form glowed brightly as a purple portal opened before him. "Well, it matters not.." Right hand reached out before him before he clenched his fingers, causing several large balls of black flame to form in his palms. "...You'll be joining her soon."

Palm charged with mixing colors of black and red energy. The power fled his hand but all it landed was air much to All for one's shock and puzzling expression. All Might vanished milliseconds before his attack could land. All for one's eyes darted in all directions trying desperately to locate the elusive hero. In the span of seconds he became confused for the first time ever.

As All for one searched a shadow loomed above him making him flinch from the sudden appearance of the hero. He snapped up just in time to be met with a confident smile and blue eyes that bore straight into his soul. His entire body stiffened, he couldn't believe it. How could he had gotten this fast? Not even he was able to do that!

A deafening roar filled the air, All Might clocked his fist against All for one's face almost plunging through. Pain exploded throughout the villain's face, feeling the sheer power of his punch. Even from this distance, the blow felt like lightning coursing through his entire body.

It was then he heard his new ultimate move before losing consciousness.

"United Kingdom Smash!" All Might roared to the heavens, colliding his fist to the villain's face striking him straight through the ground. The ground rumbled beneath them, as they crashed through the street. The asphalt cracked under their feet, giving way under their weight. The impact caused rubble to fly everywhere. Dust filled the air covering the entire plaza, choking it for hours afterwards.

When the dust finally began to settle, there was no sign of any remains left. A deep crater filled the space where once existed a tower, and all that remained was a giant crater on its surface.

All Might took a moment to glance down at All for one. His breathing still heavy from exertion. "It's over, All for one.." he stated softly.

There was no response. All for one laid motionless on the spot. Blood seeping from his mouth, his eyes dull and lifeless. There was no life to them at all. A large part of his chest and upper arm were burned away. The skin was charred, black and burnt to a crisp.

All Might sat on his knees lowering his head and smiled. He did it. He had defeated the monster. No matter how much pain it cost him. It was worth it all, he thought. For the sake of everyone else, his master included, he would make sure no one else ever experienced pain like that again.

It's finally over.

All Might was relieved and ecstatic. Except for one. Doom Slayer's eyes trained directly at All for one's unmoving body. The Slayer's armor did a quick scan over the villain and found a pulse within his body, strong but weak. It was faint. But enough for someone like the Slayer to see it from his visor. He turned toward the Hero.

No, Doom Slayer thought, he's still alive.


"All Might."

Toshinori brings his hand up to his earpiece, pressing it lightly. "I'm here, Nighteye."

"Good, good. Is it done? Have you defeated All for one?"

Toshinori nodded to himself, a broad smile spreading across his lips. All Might looked over to where All for one lay motionless on the street. "Yes, all is over. I managed to beat him."

Toshinori heard his master, Gran Torino, letting out a sigh of relief through the earpiece. "Well done Toshinori, well done. Just stay where you are, we're on our way."

He heard the connection click off. All he could hear was silence, save for the sounds of the wind blowing in his ears. His head dropped low.

"Master… I did it." He whispered.

Toshinori smiled, tears beginning to fall down his cheeks. He laughed. "I did it Master."

Toshinori's laugh was interrupted by a dark chuckle coming from before him. He snapped his head up to the source, his eyes widening slightly upon seeing All for one while still laying on the ground was chuckling.

A sinister smirk spread across the villains' face, blood dripping from his eye.

"Still miss your master, All Might?" He mocked. "How sad."

A flash of anger suddenly surged through Toshinori, he gripped his fist tightly, ready to unleash any power left of One for All on this bastard before him. All for one's smirk widened. "You have so much in common with Nana Shimura. The utter waste of a human who passed One For All on to you."

"Enough…" Toshinori snarled lowly, narrowing his eyes at his opponent's smug expression.

"Hahaha…. How cute you think you can save anyone. Yet you couldn't even save her. It was so pathetic how she died but…it was for the best. She had no skill or grand ideas she couldn't even live up to."

"Enough…" Toshinori repeated, tightening his grip on All for one's collar.

"I'll admit though, it was such a waste to kill someone of her beauty." A dark chuckle came from the villain before he spoke again. "She was quite a lovely lady. I can understand why you and her were so close. But alas…she died as she lived. A woman with no skill or ambition whatsoever, just like you, Toshinori."

"Enough!" Toshinori shouted, raising his fist high over his head. But to Toshinori's surprise, it didn't hit anything; no, nor anything was around him, he found himself in the air as wind whipped around him causing his hair to rise.

Toshinori looked behind him, looking for whatever had sent him flying. All he saw however, were several large clouds surrounding him. His eyes landed at his right wrist and blinked multiple times. A gloved hand grasped his wrist, gripping him tightly in an iron grip.

Toshinori's eyes slowly ran up the muscular arm until they landed on a helmet-covered face. The blue visor stared back at him silently. Eventually both of them landed on the ground, landing roughly. Toshinori quickly jumped away, turning his gaze back to where All for One had laid. Only to find it empty. He bawled a fist angrily, glaring at the ground.

"Damn it…" He cursed before his eyes darted to the armored man standing beside him. Toshinori's anger subsided as it was replaced with curiosity when his eyes fell upon the armored figure.

"Who…who are you?" Toshinori questioned. The armored man only stood staring blankly back at him without saying a word. Before Toshinori could ask again, the sound of whirring engines broke through the air.

Turning his attention to the sky, he spotted a fleet of helicopters speeding towards them. Lights shining brightly as they flew through the air. Toshinori turned away from the helicopters, turning his gaze back at the armored figure. He blinked, finding no one there.

"Where did he go..?" He muttered quietly.


Next Chapter: New World, but not his Own

A/N: And there you have it. A reupload yes I know. Doom Slayer awakening in the world of My Hero Academia! Now in case some of you is confuse, this takes place during the battle when All Might had his first major injury, inflicted onto him by All for one. This story also takes place after Doom: Eternal - Ancient Gods Part 1/2. Also, someone asked why Doomguy saved All for One? If you haven't pay attention, he saved All Might from All For One, because All For One pulled an attack that would have fatally wounded All Might like it did from the cannon show. But the Doom Slayer saved him and prevented that from happening. With all of that said, stay tuned for the next chapters. Hope to see you there!