This is a My Hero Academia and Naruto Crossover Fanfiction Only.
Other Franchises will be included.
Arthur's note from Hero100100
After reading 8 chapters of Izuku's Harem Academia by Raja-Ulat and thinking about the symbiotes we decided to make this story.
In Musutafu a bright light is seen as Naruto and Sasuke appear, Naruto asked Sasuke if he thinks anyone saw them to which he responded that someone might, so they decide to leave the area as quickly as possible. Appearing near a hospital they see a green-haired woman and her son.
"If I am not mistaken, we ended up in that world where that pink slime girl made Izuku that harem," Naruto said. "Let's alter this reality a little bit, Creation of all things." Naruto introduces Marvel, and DC Characters while infusing Chakra and Nature Chakra into the world. Naruto exhausted falls back on the roof, from where he was sitting.
Sasuke asked what did he do to make him that tired? Naruto said he created Nature Chakra and regular Chakra made it so that the Marvel and DC women were born in this reality and the DC and Marvel men were the great grandfathers and grandfathers and fathers of the Marvel and DC women. A few hours later they jump down to an alley when the Midoriya Family walks out of the hospital, they see the child crying, and they both asked her why he is crying.
She tells him that her son has no quirk and that her son can't be a hero, Naruto and Sasuke start laughing at what she just said. Inko becomes even sadder that these men are laughing at her son goes into Mother Bear mode, and yells at both of them for making fun of her child. They are not laughing that he doesn't have a quirk, they are laughing at what she said that he can't be a hero, they know of a Hero that only had a float quirk, and she trained All Might.
If she who has a none combat quirk can become a hero why would a quirkless person couldn't be a Pro Hero, if there are Pro Heroes exist that have quirks that have nothing related to what they do or help them capture and defeat villains. It is simply so funny that someone thinks that her child can't be a hero, he can be anything he wants as long as he puts in the effort.
Have you heard of Batman? Izuku looks at him, and tells him that he has, Naruto tells him that he has no quirk, he only improved his intellect, learned martial arts, and developed weapons and gadgets. "So improve as he did, just don't give up on his dream."
She asked who are they anyway? Naruto begins to laugh and tells her they are the Former Pro Heroes Shadow Fox, and Tengu, Izuku gets excited and tells his mother that they used to be the number one and number two heroes in America. Naruto smiles and tells him, "Indeed we were, we retired last week. We are one hundred and sixty years old, and we got no quirk."
Izuku asked them how they do all those incredible abilities and things, Naruto tells him it is ancient techniques they learned and leave it at that. "We are going to be teachers at UA hopefully we will see you there. Gotta go Kiddo, we got to meet the principal of that school."
Before they go they asked them for their names, "Who are you and that beautiful lady over there?" He looks at him and tells him Izuku and that is his mother Inko Midoriya. "Sasuke isn't that the name of the 30th ranked Pro Hero Esper? Doesn't she have a Partner? The Explosion Queen."
They both leave the mother and child, to meet the Principal, unknown to them the four of them will meet sooner than expected. Four hours have passed when the meeting with Nezu finally finished, they decide to go home where their wives are unpacking. Naruto has two daughters Naruko, who is two years older than Izuku, and Himawari who is the same age as Izuku. Sasuke had one daughter the same age as Naruko her name is Sarada.
Walking into the neighborhood we see Inko talking with Hinata about them moving in. They had been talking a while when they noticed Naruto and Sasuke walking down the street headed where they are. Out of the house where Sasuke lives, Atanih Uchiha came out trying to finish placing things in the front yard. Sasuke asked Hinata where Sakura is? She told Sasuke that his wife was still working in the hospital.
Atanih walks over and kisses Sasuke on the lips. "Sarada and Himawari don't have quirks, but no matter, we know they can still be heroes if they want to be. It sure didn't stop you or Naruto." Sekura walks up and kisses Naruto.
Thanks to the influence of Naruto and Sasuke he meet many future classmates and friends and prevented some from becoming villains. It has been ten years since they arrived in this Universe. On the last day of middle school, Midoriya learned from seven masters from Ryozanpaku.
Himawari sat on Izuku's desk asking if they are going to have lunch together in a flirty tone, Bakugo tells her to stop flirting with her man, and as explosions are going off from her hands, telling her to stop flirting with her man or she will kill her, Himawari jumped off the desk forming a Rasengan in her hand, "Try it Bitch!" As they both begin to fight each other.
Meanwhile, in the lab of Otto Octavius, a surprisingly good-looking man with four smart mechanical arms attached to his back, two human test tubes, one with a pink blob and the other with a red symbiote and both are trying to get out of the pods they are in. When Octavius hears a voice. "Doctor, how is the experiment going with the slime girl we captured a year ago and that alien we found in that meteor?"
Norman Osborn asked him, "This unique criminal that all for one has alerted us of is very interesting, I still don't understand why she uses her powers to control her victims to use them for sex, this doesn't matter right now, what matters is what we can do with her. Her ability to make copies of herself could be used to create an army of slaves, or even used to create a legion of villains."
"If we can make her be under my control, then this slime girl will be quite useful. The red alien can copy quirks and give them to the host but doesn't have a mind of its own so it can be used by anyone. What would happen if we can combine them. Otto begins with the new experiments, within six months I want to start to combine these two after our current experiments are done."
A few hours later as Bakugo and Midoriya walked toward their home. He wants to prepare for a date with a girl that is interested in him a girl named Touga. Walking through the nearby underpass a slime monster tries to take over his body, Izuku evades but using one of his tentacles picked him up and slams him on the ground knocking him out, as a person crashes down on the floor as he screams, "Never fear for I am here Detroit Smash."
After saving Izuku, he scooped up the villain and placed him inside a bottle. "All Might I am a big fan." Midoriya quickly tries to get him to give him an autograph, and he tells Izuku that he had to leave and take the villain to the police to be placed in custody.
As he jumps he finds that a young man was clinging to his leg for dear life, he told him to let go and he told him that he would die, he quickly landed on a nearby building, Izuku wanted to ask him if he could be a hero without a quirk, All Might begins to think that maybe before he would have said no, but after meeting with two men, two Americans by the name of Naruto and Sasuke he did believe that the young Midoriya could be a hero if he puts enough training and becomes stronger in body, mind, and soul.
Without realizing that he dropped the bottle where the slime villain was kept he began to hear explosions happen nearby, he tried to get there as quickly as possible, Izuku hearing the explosions knew it was Kaa-chan, and thus he was worried for her and he went to where the explosions were happening, the slime villain was trying to take over her body but she was using her explosions to try and blast him off her but failing.
The other heroes either simply stood by or made excuses that they didn't have a quirk to deal with the villain. Without even thinking about it Izuku rushed towards the villain and threw two rocks at his eyes blinding him for a little bit as he tried to free Kazuki from the clutches of the villain.
Izuku was trying very hard to break free, but with every single punch that he threw and every single kick slides off it, seeing this All Might rushed in to try and help him. He quickly defeats the villain and places it right back into the bottle making sure this time to properly seal the bottle to make sure something like this is not going to happen again. Naruto and Sasuke prevent them from trying to lecture, at least the kid was trying to help unlike them who did nothing.
One of the heroes screams trying to throw an accusation at them, Naruto told them they just arrived, but they sensed what was going on and that is why they hurried to where they were, but by the time they arrived the villain had already been captured, "You know Midoriya you will be one day a great hero, one that will make villains into Deku's, come to think of it, it is a nice hero name for yourself. For you have infinite possibility while the villains will have none."
A few minutes All Might appears in front of Izuku and Bakugo, He explains everything about how he was once quirkless and how he obtained his quirk from his mentor, he tells him he wanted to be his successor to receive one for all, to which Midoriya tells him that he shouldn't that this would be like betraying Naruto and Sasuke who has been training him so far, much to his surprised Naruto and Sasuke appear and tell him that they trained him for this specific outcome so he should accept to become the next person to have one for all.
All Might ask them to show him how strong he is, Naruto pulled a piece of paper showing how strong Izuku is, and that is when he begins to smile, "Excellent for the next month you will train with me, you will help clean the Takoba Municipal Beach Park as part of your training to make you ready to accept my quirk. Meet me tomorrow." Bakugo can walk toward him and thanked him for saving her as she turned around and kissed Izuku and told him she will be his girlfriend when they both make it into UA High.
One month later Izuku managed to clean up the entire beach. "Congratulations, you have done well, we now have nine months to train you to use one for all but first you must eat this." He pulls out one of his hair and explains that he must eat one of his hair to pass on his quirk, he tells him that this is the way he obtained it from his mentor, as Izuku eats the hair Naruto and Sasuke show up.
Sasuke warns him that the quirk is so strong it can destroy his body, so he should train his entire body and not just focus on one part of his body. To use one for all, all over his body, and Naruto tells him to start using very little and build it up higher the more resistance he builds to it. They begin to train to use and get used to the strain of using the quirk by the time the entrance exam will take place he should be able to use thirty percent of one for all.
For nine months he was trained to use one for all and how to use the power of Chakra. As they saw him train hard Naruto and Sasuke did their best to help All Might train Izuku with Bakugo cheering him on for emotional support.
On the day that the exam finally took place, they went towards the UA High building where the exam was to take place, but as soon as he got to the entrance somehow he lost his balance and he nearly fell till he felt someone slap him on his back making him float, someone, giggled and saw that a girl helped him back on his feet and canceled her quirk, "You know it is bad luck to fall before a major exam, so I had to help you, I don't know if you remember me my name is Ochaco Uraraka." Izuku thanked her and reintroduced himself.
He wished her good luck on the exam and so did she as they both entered the massive school compound, and they finally made it where they were supposed to take the first part of the entrance exam. The written exam was rather easy for Izuku since he has been studying for it for quite a long time, and the second part was to destroy robots, the robots would have numbers the higher the number the more points he could earn and the last one was worth Zero points so they just need to avoid it since it is a giant robot the size of a skyscraper.
Upon hearing that the test has started he took off everyone screaming that he was cheating to which Present Mic told them there is no start signal in combat, as Izuku used five percent of one throughout his entire body forming his full cowl style, and went destroying one robot after another racking up quite a lot of points, till much later he began to hear the sound of a large alarm going off and a building appeared to split open and a massive robot was seen walking out of it.
As he decided to avoid it he noticed that Uraraka was trapped beneath some rubble he knew that his points would suffer if he fought the Zero Robot, but he simply couldn't let her be hurt, even if he failed he would at the very least help her by saving her, he immediately used ten percent full cowl and picked up the large rubble that was pinning her down and told her to run, that he would buy her some time.
As she saw him, he used fifty percent of one for all and jumped up where he immediately noticed the giant robot was about to fire a laser at them and with a single punch destroyed the entire head and cause enough damage that the robot was breaking apart as it fell, Uraraka slapped him once more making him float as he safely floated down to the ground thus when he was safe on the ground she canceled her quirk.
As he was on the ground the medical bots came for them both and took them to a recovery girl who noticed that both his legs and arm were broken, so it will take some time for her to manage to heal Izuku's injuries, but the thing is, thanks to him Uraraka received no damage from the giant robot the only slight injury she had was largely due to the rubble that fell on her, and those were mostly simple scrapes and bruises.
Meanwhile in the Lab of Doctor Octavius, "Well Doctor, your other experiments turned out to be a success, but it took you four months to get this project started, at least we are ready to combine these two creatures. It might have taken you longer than what I would like but at least I hope the results will be at to what I would expect."
After they both recovered they were allowed to go back home and were told they need to wait for at least a week before the results of the entrance exams are collected and letters will be sent to those that got accepted into UA High. Izuku was pretty confident in his written exam, and he did manage to destroy quite a few number robots, the only thing that worried him is that they might fail him simply because he disobeyed their instruction to ignore the zero-point robot, but he could hardly ignore it when Uraraka's life was in danger.
As Izuku continued his training while he waited it finally came the day that a letter was received from the school, it was a little heavy and as he opened it a metal disk fell out and immediately began to display a holographic message that All Might record for each of the people that managed to pass the entrance exam. "Young Midoriya, you have made me quite proud you managed to get top ranks in the written exam, in the other section you managed to get quite a few points destroying the numbered robots, but what made you stand out was the fact that you decided to help that girl while ignoring the potential danger you would have to face."
"After everything was taken into account and the faculty and staff of UA High were done discussing your results it was decided that you are the number one rank student on the entrance exam. Congratulations young Midoriya, I will be looking forward to how much you improve as one of my students."
Meanwhile, in the now destroyed lab of Doctor Octavius, the injured Otto and Norman were trying to find their new super weapon, a screen turns on, and All for One is heard, "What happened I thought you had our future Legion under control?" They didn't expect it to turn a mouse and turn it into a super version of it and be able to augment it, grant it quirks and be able to create multiple copies of itself long enough to beat them up and escape.
All for one asked them why did they think they called it Project Legion, he ordered them to find it before it can find a host that can protect it. As Uraraka and Tsuyu find an injured little puppy they go near it to see if it is ok. When they try to pick it up, the slime separates from the puppy turning it back into the mouse that's scurried off and slime separating into two and both of them enter their bodies. In their mindscape, she apologized that she needs to find a host that can protect her from the people that kidnapped her.
She went through their memories to try and be able to pretend to be them to hide better, even if they tried to prevent her from gaining their memories, much to her shock she found something rather funny. "Isn't it funny? You both like the same boy and from what I see he might be the host that I am looking for, why it seems we are going to have some fun."
As they walk towards their school, they see Izuku talking with another guy who he met during the entrance practical exam, and of course, Bakugo is there as well. For a person who insults Izuku so much by calling him a Deku, she sure loves to be constantly near him, till the thing currently in their bodies told them that maybe she too secretly loves him like they do, causing them both to deny it while making them blush.
Izuku walks into the classroom and looks at the thing on the floor, "Good morning Aizawa Sensei." He tells him to take a seat with the other students, leaving him an apple near where he is as he went to his seat. As he sat down waiting he sits right in the seat between four people he already knows, Uraraka, Tsuyu, Eri, and Touga, there was another girl who was the daughter of Naruto Himawari, and a girl with a Nature control quirk named Pamela.
Little did he know the pink slime girl was already in them all, having read their memories and being more sure that Izuku was exactly the host that she needs to be safe from the villains that wanted to turn her into a weapon against her will. "Alright, I am your teacher Shota Aizawa, I am your teacher for this class, go to the sides of the room and pick up some gym clothes that will fit, we are having a quirk test."
A boy who introduces himself as Tenya Ida asked about the orientation to which Aizawa said that there is no time to lose on the stupid pooch and pony shows, they need to get started learning and the only way that he can teach them is to have them do this quirk test so that he understands what they are capable of.
As each of the boys took a set of gym clothes he went to the changing room, till he saw a boy peeping in through a hole in the wall that was made to look into the girls changing room. Izuku pulled away a guy named Mineta and told him to stop doing that or he would regret it, Mineta not even bothering to listen told him he can has his turn looking at the girls after he did, he needs to wait for his turn.
Not wanting to deal with this stupidity, he simply finished getting dressed and walked towards the field where the test was about to happen, when he got to the door he saw Mineta screaming in pain as he was rolling on the ground as something had poked him in the eye through the hole he was peeping through. Bakugo was laughing as she saw a girl using her earphone jack-like ears to send one through the whole and do that to the pervert who was trying to peep on them, she even heard what he said and warned the other girls.
Aizawa grabbed a ball and looked at the students, "Alright each one of you will come here stand at this circle and throw this ball as hard as you can using your quirk. The first person will be the one who got the highest scores in the entrance exam." Bakugo thinking it was her stepped forward till Aizawa threw the ball to Izuku who caught it, "Izuku you are first, get over to the circle and throw it. You better try your best."
Bakugo was complaining about the fact that Izuku was said to be the first place in the entrance exam saying that there is no way Deku of all people got a better score and the teacher was taking pity on him. Deku began to rotate his arms fast and when he got it at the right speed he threw the ball clear across the entire field, the tracker control showed Aizawa that he threw it three thousand feet.
Aizawa had tried to use his erasure quirk on him but for some reason he still managed to get this high of a score, this means that he was able to do this without using the quirk he knew he obtained from All Might. One of the students said that it looked kind of fun, that it was a game, which made Aizawa angry, "A game is it? How about this for fun? The person who gets the lowest score in this will be immediately expelled, and don't think I can't do it. I have expelled an entire class I found unworthy last year."
This made them realize that saying that had been a stupid idea since the teacher was pissed. They saw that he was not kidding as they saw the glare from his blood-red eyes, and they began to take this very seriously, Mineta was in pure hell thinking seeing that he was doing badly in each of the physical activities, one after another Izuku blasted right through being in the top five, this made Bakugo secretly proud of her secret crush, but publically she pretended that she didn't believe that he could do that.
At the end of the quirk test, Mineta was the person with the lowest score, to which Aizawa told them that they need to get ready to go and get ready since they still needed to be shown to the dorms, Mineta felt miserable thinking he was going to be expelled asked why should he even bother since he is about to be kicked out. Aizawa with a serious look on his face looked at him and the other students, "Because I am not going to expel anyone, that was a ruse to get you to take this test seriously. Being a hero is serious business, there is no place for those that don't take this seriously, they end up dying quicker than most."