Chapter Text
My first crossover story! I've gotta admit I'm excited for this. This stories gonna be interesting to write, as Hazbin Hotel is currently only in its first season at the time of writing this but my main plan is just to pause this story once I get to the end of Hazbin's first season and continue it for the second. I'll probably just keep on doing that for a while.
I'm kinda worried about timeline stuff, as Hazbin Hotel's first season goes on for six months which is literally half of Mha's entire show. So in preparation for that I have changed one thing! Izuku's conversation with All Might day happens one year earlier so we probably won't be focusing on the Mha stuff until season two or even three. It depends how I feel (fingers crossed it's two). Don't worry there will still be some stuff that happens on the human realm during the first season but not as much for now.
This is gonna be one hell of a journey and I'm very worried about how this goes but my brain won't let me write anything else right now so… enjoy!
Disclaimer - I don't own My Hero Academia or Hazbin Hotel. The day I do Hell will freeze over. (Get it? You get it…)
Chapter 1 - Swan dive
Izuku, an innocent thirteen year old boy. The victim. Quirkless. Ever since he was diagnosed he'd been viciously bullied by almost everyone he knew with the exception of his mother, who, although she'd never admit it, didn't believe in his dream of becoming a hero. That was all he wanted, to be a hero, to be someone who helps and saves others, to be the feeling of safety for all of the world so people would know they were always okay. To put it simply Izuku was a completely pure soul, his path set towards heaven. However nothing ever goes his way. Ever.
Izuku's day had been awful, it'd started off well at least. Once he had left for school he got to see heroes fighting a villain with a gigantification quirk who was ironically defeated by a new heroine who also had a gigantification quirk, while others were paying attention to the fight Izuku couldn't help but note down every little detail about each of the heroes quirks in his notebook, marvelling over the different ways each of them used their quirks and completely fanboying over each move they used.
Then he'd arrived at school, as per usual he attempted not to get involved with his classmates however god was not on his side as, despite them only being thirteen, the teacher decided to talk to them all about their future careers with him telling them that he knew they would all be great heroes, Izuku was obviously not included in the word 'all'.
Their teacher had then called upon random kids in the class at a time asking each student which hero school they wanted to go to, he'd started with Izuku's 'best friend' Bakugo who's quirk allowed him to create explosions on any part of his body, naturally Bakugo had been ego fed his entire life with his quirk that was practically made for a hero and had opted for U.A as his school of choice with other students in the class murmuring about how hard it was to get into as U.A was famously the best hero school in Japan, with it even having been the school that taught the number one hero All Might.
Izuku and Bakugo had both known each other since as long as either of them could remember. They were as thick as thieves when they were little, always talking to each other about their dreams of being heroes and going through walks in the local forest. However once Bakugo had received his quirk and Izuku did not their friendship began to self-destruct, Izuku hadn't even realized it at first but Bakugo's ego was growing and growing which made him more and more cruel to other kids, especially Izuku who'd he nicknamed 'Deku'. Izuku tried to stop him from hurting another child once when they were both in kindergarten only to be beaten up by Bakugo and his friends. That was when he learned that not only was Bakugo Katsuki not his friend but not all men are born equal.
Over the years they drifted further and further apart, each time Bakugo bullied and beat him for being quirkless Izuku felt a small part of himself shrivel up and die.
For some reason that was when the teacher decided to ask Izuku which school he wanted to go to, which was, like Bakugo, U.A. Upon hearing this the class burst out into laughter at the thought of the weakest kid in their class trying to compete with the strongest, which of course Izuku wasn't but it wasn't like they cared. As soon as he heard this Bakugo raged and shouted at Izuku from his seat, saying there was no hope for him to ever be a hero and mocking him for even trying to wish to go to U.A. Luckily for Izuku the teacher calmed Bakugo down and got him to sit back in his seat.
The rest of the school day had gone normally all up until Izuku tried to leave at the end of the day, keyword 'tried' as Bakugo stopped him before Izuku could even get up from his seat, he then told Izuku not to apply for U.A before stealing, destroying and then throwing Izuku's hero notebook out of the window before threatening him once more and walking away. Izuku then let out a breath he didn't realise he was holding once the explosive boy exited the doorway, however Bakugo didn't fully exit as before he left he turned to Izuku one more time
"Y'know if you really wanna be a hero that badly there might actually be another way. Just pray that you'll be born with a quirk in your next life and take a swan dive of the roof of a building"
At the time Izuku couldn't believe what Bakugo said, despite all the physical and verbal pain Bakugo had inflicted on him not once had he said anything like that. Izuku turned with fire in his eyes however Bakugo silently threatened him with his quirk before turning and leaving.
Izuku then collected his notebook out of the stream it'd fallen in once Bakugo threw it out the window and took the long way home to help him internally deal with what Bakugo had said.
'How could Bakugo say that to me?' 'What did I ever do to him or anyone for that matter?' 'Why is my life miserable?' Were the thoughts that occupied his mind, all until a new question arrived. A thought he'd never imagined he'd ever think. 'What if I actually did it?'
'No snap out of it Izuku,' he thought, trying to silence the evil thought, although no matter how hard he tried to stop it he couldn't get it out of his head, good thing a distraction soon arrived in the form of green sludge coming out of the sewers. It turned out that this sludge was actually a villain, who's quirk made him a sludge monster and allowed him to take over people's bodies and according to him Izuku "would do" as a fitting body.
Izuku felt nothing but pain as he desperately tried to separate the villain from his body; however, as the villain was made of sludge, nothing happened. Accepting his fate, Izuku felt his control over his body fade as he felt himself pass out, however, before he did, he heard someone else burst out of the sewers before shouting a mighty "TEXAS SMASH!" just as Izuku lost consciousness.
As Izuku woke up he saw his saviour, a towering figure of a man with a muscular physique and blond hair that was swept back with two tufts sticking out from each side. The man simply wore a white t-shirt and green pants with red sneakers, despite his casual outfit Izuku could automatically tell he was standing in the presence of All Might - the number one hero.
All Might was not only the number one hero in Japan but the most powerful hero in the world. Like his age, his quirk is unknown however many speculate that it is a severe muscle boost that makes him insanely strong as he can take out the most powerful villains without even a sweat. Izuku had spent hours when he was little watching videos of him saving people with a smile on his face, fearless, immortal. All Might would help him. All Might would tell him he could be a hero without a quirk. He had to.
The number one hero didn't have time however and began to prepare to leap away, presumably to save more people but Izuku needed to ask him if he could be a hero and was so invested he ignored the fact that All Might had just signed his notebook. Instead he latched onto the number one hero's leg just before he took off and had to cling on for his own life as the symbol of peace zoomed through the air.
Upon noticing Izuku, All Might quickly landed on the nearest rooftop he could find and was going to leave Izuku there before he heard the question "Can I be a hero without a quirk?" It immediately made him stop, ready to reply however he suddenly froze as smoke began to expel from his body. Izuku didn't notice this as he kept on talking, explaining about how he idolized All Might for how he saved people with a fearless smile.
That was when Izuku looked up to reveal that in the place of the symbol of peace was a skinny, weak man wearing the same clothes as All Might was however they were much baggier on him and the two tufts of hair that stuck up for All Might were now relaxed and on the sides of his face.
Izuku's initial reaction was that this man was an imposter of All Might however the man reassured him he wasn't and showed Izuku an injury he got in a battle five years ago, the wound was a dent in the side of his body that had resulted in him losing his entire digestive system.
He then continued to say that despite what it might look like his smile is not fearless but is rather there to reassure people they will be okay and that to do that you must have enough power to know things will be okay and therefore…
"So no, you can't be a hero without a quirk"
Izuku's whole world shattered, he felt everything he'd ever done flash before his eyes and just stood there, too stunned to speak as All Might told him that he could always be a police officer and then walked past him, leaving the green haired boy on the roof all alone.
And here he was. Standing there. Reflecting on everything he'd done. How stupid he'd been. There was no way he could be someone people could rely on. He couldn't be a hero. He was doomed from the start. So what did he do now?
That was when he recalled what Bakugo said earlier, "Just pray you'll be born with a quirk in your next life and take a swan dive off the roof of a building" Well here he was. Almost poetic really. Maybe Bakugo actually had two quirks with him also having a predicting quirk. That's something Izuku could imagine happening just to make him feel worse. It was more likely than him being a hero.
He heard voices in his head, telling him to do it. To prove them all right. That there was no point in living any more. That he was just a burden to his mother. That he had to end it all.
So Izuku conceded to the voices, he approached the edge of the building, facing into the alleyway. As he looked down his entire life flashed before his eyes. His mother apologizing when he asked if he could be a hero. His father leaving once he found out. The years of torment. And finally All Might telling him he couldn't be a hero. It'd all led to this. To nothing. His life was a nightmare, at least now he'd never have to hope he'd wake up.
Izuku leaned forwards and felt himself drop.
Izuku opened his eyes. He was in an alleyway but it didn't appear to be the one his body would've fallen into. Instead of the completely dark alley this one fashioned a fully red colour pallet, however he didn't notice this. "Can't even kill myself right, god I am pathetic" He murmered to himself as he pulled himself up, surprisingly there was no sign of blood from his landing.
He simply shrugged it off and began to leave the alley. "I might as well see my mom one more time and write a letter to her before I try again" he muttered, figuring this was only a sign of how pathetic he was.
Suddenly a hand met his shoulder, Izuku peered back to see a man with, what he presumed to be, a mutant beetle quirk as his face matched perfectly with one along with him being a dark shade of blue and having a shell that was covered by white vest with four extra holes ripped into it for the man's four extra hands. The man made a sleazy grin at Izuku. "Hey kid" The man began "Mind helping with something, don't worry it'll feel really good for you"
Izuku immediately understood what the man meant and tried to run off however the man's grip tightened on his shoulder, the man snarled as he grinned "Come on kid, we're all stuck here together, so just hold still and let me have some fun" He then began to man handle Izuku however the green haired boy struggled against him and tried to get away.
"L-Let go of me!" Izuku groaned as the man tried to pull him to the ground, suddenly he felt something inside him snap. His eyes glowed a bright green as he felt the skin on his face peel backwards, but it didn't hurt, it felt natural. As the skin peeled back he felt some kind of gas leaving his flesh, the gas was black with a green glow and immediately engulfed the man who collapsed on the ground the second he smelt it. "What the heck?!" Izuku questioned before he felt himself being teleported somewhere.
The place he was taken to was completely pitch black and only contained Izuku and the beetle man who now looked very angry "Hey the fuck did you just do you bitch?!" He asked as he began to charge once more at Izuku, however Izuku wasn't scared, he felt completely calm as he let his body morph, turning him into a pile of, what appeared to be, poisonous bugs which pooled onto the floor where he once stood.
The man immediately stopped at the sight of this and stood there in fear. "T-The fuck" he said before Izuku felt an urge inside of himself that he listened to. As he listened he felt the bugs that were his body all charging towards the man, who looked too scared to even move as the bugs crawled up his legs and quickly engulfed him. The man then seemed to realize what was happening and tried to fight back however it was too late as the bugs bit into him releasing the toxins from their bites into his body.
As the man screamed in pain the bugs reformed into Izuku who jumped away from the man. Izuku stared at the beetle man's now collapsed body which was somehow still conscious but appeared to be in immense pain as he writhed around in pain however he didn't feel any guilt watching the man squirm around on the floor, but instead he felt free and couldn't help but grin as he watched the man get his karma. His whole life had been a nightmare but now he could make someone who actually deserved it suffer the same way. The only question was how.
Before Izuku could question further he felt another tug and pulled it further as he then saw the man's body go completely straight and raise up into the air before dark chains that looked the same as the gas he'd emitted earlier latched onto his wrists, ankles and neck, the end of these chains then presented themselves in front of Izuku who, almost instinctively, grabbed them.
As he did the man fell to the ground and coughed. Izuku noticed his previously red irises had turned the same shade of green as Izuku's with a circle of the previous red still residing inside of them as his sclera was now turned completely black.
The man growled "You little shit!" He then took another attempt at charging Izuku however the green haired boy simply raised his hand making the chain around the man's neck reappear once more and pulled him down to the ground. The man seemed to realise what that meant and looked up at Izuku with pure fear "H-Hey I w-wasn't b-being serious kid, I w-was j-just messing with ya th-that's all"
Izuku looked down at the man feeling no pity for him as he knew full well what'd be happening to himself if he'd not done this, instead he ignored the man's plea "Don't act like your so innocent" He replied as he felt them both return to the alley they were previously in.
Still holding the man's chain, Izuku pulled on one last tug in his mind and the man went completely unconscious. He then calmed himself as he felt his skin return to its previous place on his face. "H-How did I-" He questioned, before he looked down at his hands seeing that his fingers were now claws and his skin was a light gray.
Izuku was still dressed in his black school uniform but the collar of his shirt was higher than before, stretching up to the top of his neck, making it more jumper like and it now had abstract dark green shapes that looked like tear marks that had been coloured in with more in the centre of his torso and the top button now was a small yellow eye with a green iris. He also noticed that he was about a foot taller making him around six foot five.
"Most interesting" Izuku turned around to see a lanky, spider-like man with dark gray skin and four lime green eyes. He wore all-black clothing, with a pitch black cloak that covers most of his body. At the collar of his cloak was a large black spider with lime green stripes on its eight legs, as well as lime green eyes and lime green on its back. He also wore a distinctive big black top hat with a light grey patch at the front, along with a gray skull and a lime green-and-maroon-striped feather on the right side.
Despite Izuku's new height this man still towered over him as he was about ten feet. The man's voice was English and sounded shakespearean. Unlike the beetle man who was out like a light on the ground, this man didn't look like he was there to hurt Izuku.
Realising this man had just caught him forcing a man unconscious without any sign of effort Izuku quickly tried to explain himself "W-Wait it's n-not what it looks l-like-" He began, however the man raised a hand out of his cloak, stopping Izuku.
"Doth not be alarmed young man" He began "I hath heard what was happening to thou from a distance and did approach to thines aid however thou hath seemed to dealt with the issue without mine own assistance"
Izuku realised that this man wasn't surprised in any way despite seeing what he'd done and looked around noticing that the streets were full of people who all appeared to have some type of mutant quirk along with fires that no one seemed to be concerned about in several places. Wherever he was, it wasn't Japan as he also seemed to now understand and speak English despite only having a poor understanding of the language. "Where am I?" He asked
The man raised an eyebrow "Thou art new here? With thine's power I did expect thee to have been manifesting power for a while anon. Young sir I may not how to bid thee this news however thou art dead, the lodging thou art in is the lodging were all us sinners endeth, hell"
'Sinners?' Izuku mentally questioned 'Hell? How am I here? I didn't do anything bad. I only…' He then remembered how suicide was strictly forbiden in the bible 'oh'
"I knoweth this might beest a lot to taketh in" The man began "however someone as powerful as yourself shouldst knoweth to be careful"
Izuku glanced at the unconscious beetle man, recalling how not even ten minutes ago that man was attacking him "No kidding" He responded, "S-So does everyone here have some kind of new quirk?"
"Quirk?" The man questioned "Forgive me, however I am not familiar with this term"
Izuku's eyes widened "O-Oh they're like powers, m-most people have them nowadays"
"I see" The man replied, "I believe I recall hearing people talking about these 'quirks' thou speaks of. Most speak of how their 'quirk' hast not transferred with them to this afterlife and instead they were given abilities based on how they met their demise"
Izuku was surprised at hearing this but continued with his questioning "S-So can other people d-do that" He asked, pointing at the still unconscious beetle man
"Not in the way thou did it" Was the answer from the lanky man "Other souls must accomplish what thou hast done through making a deal which is something thou should be aware of."
Izuku took in the information and asked one more question "O-Okay and w-what exactly is it that I've done?" He asked
The tall man grinned "Thou hast obtained that foul creature's soul" He answered, "The more souls thou obtains makes us demons more powerful, at a certain pointeth of influence or power thou ist considered an overlord and is considered much more highly in hell. I myself am an overlord due to my long lasting grip over this land but I myself cannot obtain souls the same way thou hast."
Izuku took in the information from the spider like man, internally he knew that his best chance of survival would be to hide in the shadows to use the dark gas on people, not like he had much of a choice and besides if people were in hell they were there for a reason. "O-Okay" Izuku responded, making up his mind "T-Thank you… s-sorry I didn't get your name"
The man chuckled "My true name ist not of importance however the denizens of this place know me as Zestial, if thou ist to become an overlord too I recommend creating a persona for thouself as well"
Izuku pondered a name, something that reflected on his life but wasn't an immediate tell. He grinned, coming up with the perfect name "Deku" He replied
Zestial grinned "Well it hast been a pleasure to meet thou Deku, however I must leave now I do expect big thing from thou in the future"
Izuku smiled back, he knew he might not be good at this evil thing however something inside of him felt completely fine with it. "I won't disappoint you Zestial" He replied as the tall demon strode off.
That calm April day would be known as the day that The Nightmare Demon arrived in hell and over the rest of that year he made one of the biggest splashes an overlord had made in three hundred years.
I am so sorry I'm late! I got so distracted writing this chapter, especially during the recap part at the beginning. But this fic should usually update on Thursdays, Fridays and Saturdays every two weeks.
I won't focus too much on Izuku's first eight months as an overlord but rather I'll timeskip to a major event he causes roughly half way through that year before time skipping once more to his first extermination and the hotel's beginning.
Again, I am incredibly worried about writing this fic but I'm hoping it goes well, it should do.
See ya real soon - The Lost Tree