Deku gonna have all the powers of muzan and by chapter 2 he will have Kokushibou Akaza douma and the rest of the upper moons he is also gonna somewhat overpowered. Hes gonna be the older brother of momo and her family he is also the same age as muzan but he prefers the name muzan as he hates his family back then also he isn't like muzan in the anime he isn't greedy he just hates people who are overconfident in there skills he acts like a big brother to the moons also should I add izumi as his sister that he turned into a demon because she had a weak body like Rui in the anime it's up to you guys also I'm gonna work on Kokushibou deku later also should I make him in this story have a harem of a single or poly it's up to you guys I don't like restricting people's freedom at all so without further a do let's get in this story starting during the sengoku era also he encountered yorichi but he was looking for a demon that they were looking for
Third pov 1000 years before the era of quirks
Muzan/deku: ' when I was born I was incredibly weak I could hardly stand up without difficulty but now I'm a demon king god what did I do to get this power '
Flashback
Mrs. Kibutsuji: * giving birth *
Mr. Kibutsuji: honey just a little bit further
Mrs. Kibutsuji: how would you like to be in my situation
Mr. Kibutsuji: sorry
Nurse: just a little bit longer
Mrs. Kibutsuji: * pushes again *
Nurse: * takes the child * it's a boy
Mrs. Kibutsuji: I want to hold my child
Nurse: * gives the boy to her *
Mrs. Kibutsuji: * holds him *
Mr. Kibutsuji: what will you name him love
Mrs. Kibutsuji: how about Izuku Kibutsuji
Mr. Kibutsuji: that's a beautiful name I like it
Mrs. Kibutsuji: yes it is
Nurse: I will take him to clean him up and he will stay the night to make sure he is healthy and in good condition
Mrs. Kibutsuji: ok * gives Izuku to the nurse *
Nurse:* takes Izuku and goes to another room to clean him up and check his heath * ' oh my this poor child he has a a disease ' (the same one that muzan in canon has) well I should tell them the news * goes back to the room * I have some news to share with you
Mr. Kibutsuji: well than go on
Nurse: well then the child has good health except one thing he has a disease but other than that he's perfectly fine
Mrs. Kibutsuji thanks nurse we will see that he gets good treatment
Nurse: well than I will leave you to rest * leaves the room *
Mr. Kibutsuji: what can we do we don't want an heir that's weak in his body
Mrs. Kibutsuji: no we don't but we can get treatment for him with our wealth and influence
Mr. Kibutsuji: of course honey ' such a kind soul that have '
16 years later ( during this Izuku got weaker but still is very good at walking he is also very intelligent and a great tactician and can make split second decisions and for that many doctors heard about his stubbornness to not stop with his duties and are willing to cure him for free but the Kibutsujis always decline saying they are looking for the perfect doctor to help him and they find him and when Izuku met him he simply introduce himself as muzan not liking the fame he gets from his sickness but he enjoys a good challenge from the sickness is giving him and still does his normal routine )
Muzan/deku: * going to meet the doctor as he has good news from him so he has a formal looking kimono on to look good * sighs enjoy the challenge from the sickness I have but the quicker I get rid of it the more attention I get from mother and father ( also they started to neglect him but pays attention to him in public as they want to keep a good reputation)
Muzan/Izuku: * goes to the doctor * you said that you had good news
Doctor: I do I can cure you but at a cost
Muzan/Izuku: what is the cost
Doctor: the cost is you ability to walk in the sun but if it works I will be able to get rid of that drawback for
Muzan/Izuku: then do it ( also they had a daughter that they pay attention to more than Izuku but the sister looks up to her big brother as he fights his disease even though it could kill him )
Muzan/Izuku: ' if I get rid of this sickness sis will be happy and mother and father will be more mindful about me' alright well can you begin
Doctor: whenever your ready sir
Muzan/izuku: you have been helping me since I was a little boy so just call me Muzan after all we're like old friends Aren't we I would like you to do the treatment now as I want it done
Doctor: yes I guess we are of course let me get the things to do it* goes to get the blue spider Lily *
Muzan/Izuku: ' I'm swear if they are boasting about how that my sister is the perfect heir I'm gonna snap ' ( he doesn't hate his sister he adores her he just doesn't like when his parents boast about how she's perfect it makes irritated)
Doctor: well I got the stuff* does what ever he does in the manga except he doesn't get killed by muzan * well I'm done
Muzan/Izuku: thanks doc I fell so much better than before ' weird I can smell his blood but no I will not do anything that includes hurting another person no matter if I have to rid myself of this treatment and go back to being sick ' thanks doctor also can I go in the sun
Doctor: yes I got rid of that drawback while grabbing stuff and if need to know the meds I used was called the blue spider Lily
Muzan/Izuku: thanks doc I will leave now and have great day also * tosses him 500,000 yen * take it you deserve it as you helped me it will never pay for what you did for me
Doctor: I thank old friend and you have a great day
Muzan/Izuku: I shall* leaves the house and goes home just as it the sun was setting *
20 mins later
Muzan/Izuku: * arrives home * yelling I'm home ' not like you care you only care about izumi rather than both of us I should go tell them the good news ' * goes to find his " parents " * * sees his mother in the kitchen making dinner for everyone * hello mother I have good news for you
Mrs. Kibutsuji: * ignores him *
Muzan/Izuku: I got rid of my sickness isn't that great
Mrs. Kibutsuji: * still ignoring him as she doesn't care at all *
Muzan/Izuku:' just as I thought you don't give a single fuck about me ' I will go tell izumi the good news than so she can tell you instead also * leaves a letter on the table for her and his father if they ever open it * there you are izumi
Izumi: * sees him and feels bad for how there parents treat him * hey big brother how are you
Muzan/Izuku: I'm good infact I have great news for I got my sickness cured today I told mother I didn't want even want to talk to father right now
Izumi: * excited * you did that good and now that your healthy mother and father will pay attention to you now won't they
Muzan/Izuku: I don't think so izumi I want you to tell them since they don't care about so will you do that I'm gonna go visit my friends
Izumi: I will brother
Muzan/Izuku: * remembers * oh izumi I have this for you * gives her a letter * don't open it until mother or father opens there as it has a special surprise also I will be gone for a few days can you handle the chores I set up for to stay responsible
Izumi: ok and stay safe on your travels
Izuku: I will izumi and be good ok
Izumi: I will
Izuku: bye izumi * leaves *
At dinner time
Izumi pov
' Where's brother he is usually the first one here at the table even before mother '
Mother: * sits down * well izumi how was your day
It was good but I got news that made it even better
Father: and that is * as he is sitting down *
Brother got his sickness cured today he said he told you mother
Mother: I didn't hear him
' that because you were purposely ignoring him as you don't care about him' oh well than he also said gave you a letter as well
Mother: I would have noticed if he did I will go check * stands up and sees it on the counter * goes to it I guess he did
That's great he also gave on to me I have it right here* shows letter *
Father: well we should eat first than open his letter then sound good
Yes it does just don't forget father
Father: I won't
Mother: let's eat
They eat and izumi reminds them about the letters again so it's around 10 pm and they finally give in to read his letter
Well I will open mine * opens letter and reads it *
Mother well what does it say
It say " dear sister I hope your reading this out loud do mother and father hears this so I thank you for looking up to me but I know you can do anything even without me so that's what I want you to do I hope you know I love you very much unlike some people you know who I'm talking about also when I went to get cured after the doc did what he had to do I leaned that I have a severe drawback to it I must consume human flesh but I hope you don't hate me even if you do just know I will make sure your safe no matter what I love you so much and I as I was deciding if I should do the doc said that the cost is severe but as I thinking I thought about you I always put you before anything else but when to my own decisions that concerns myself I made sure that they benefitted me and you no one else besides us because you actually cared about me I love
Love your brother Izuku "
I-i-i don't know what to say he has such a bad cost but he still toke it even if he didn't want he still did everything for me and he did everything for me even if it would cost him his ability to eat normal food
You should open yours now
Mother: * opens it * " dear mother and father what the ever living FUCK DID I DO TO GIR YOU TO IGNORE ME DO YOU KNOW HOW FUCKING HARD IT IS KEEP MYSELF JUST WANTING TO CONTINUE LIVING WELL THE ONLY THING GOOD THAT CAME ABOUT OF MY SUFFERING IS IZUMI, AS SOON AS YOU COULD YOU JUST STOPPED CARING ABOUT ME AND STARTED TURNING YOUR ATTENTION TO HER BUT JUST KNOW THAT IM NOT COMING BACK I HATE OT HERE THE ONLY THING THAT KEPT ME HERE FOR AS LONG AS IT DID WAS IZUMI AND HER KINDNESS I HOPE YOU TAKE THESE TO YOUR HEART BUT OH WAIT YOU BOTH DON'T HAVE ONE BECAUSE IT WITHERED AWAY ALSO I FUCKING HATE YOU FOR EVERYTHING UP TILL NOW I KNOW IT TOOK IZUMI REMINDING YOU TO OPEN IT AND IF YOU HADN'T YOU WOULD HAVE JUST TOSSED IT AWAY WITHOUT A SECOND THOUGHT NOW DON'T BOTHER COMING LOOKING FOR ME AS I WON'T BE ABLE TO BE FOUND ALSO I HOPE YOU LIKE BEING WITHOUT THE GOOD REPUTATION YOU HAD AS I GOT RID OF THAT A COUPLE MONTHS AGO WHILE GIVING IZUMI A BOOST TO HER AND HER FRIENDS REPUTATION AS THEY DESERVE IT MORE THAN YOU DO I KNOW EVERYONE WILL MOURN MY " DEATH" GOOD BYE FOREVER
with hate not sincerely muzan cause I despise the name you gave me but I will Kibutsuji as my lady name as it's fitting on me more than you
* Tearing up * ' you both drove him away but he stayed because of me and needing to be there for me I didn't even know you were suicidal at all ' * stand up *
Mother: where are you going
To my room and don't talk to me again ever
Father: that is not the way you talk to your mother young lady
Is she really I wonder was she ever one to izu- no muzan once in her life probably when he was born but it grew to this I can't believe you well they say karma's a bitch and I agree with it * leaves the room going up to her room and starts crying and blaming herself that she was not more observant of her surroundings* I'm sorry brother I should have payed more attention to your feelings
Next day
* Gets dressed * i should tell my friends what happened to muzan as he would want me to * leaves her room and goes to muzans to find something of his to wear * I've been in here only one other time and we'll it still looks nice as it did then he really didn't like his my room messy it's one good thing I got from him among other things as well * sees one of his scarfs that he wore a lot * you never leave your scarf unless for a good reason * takes it and puts it on * it's just as comfy as you said it was now I see why you went everywhere with it * leaves to meet up with her friends * hey guys how are you
Friend 1: good you izumi hey wait isn't that muzans scarf
Yes it is he left last night and left letters for me and mother and father
Friend 5: what kind of letters
The kind you leave when you're not coming back
Friend 3: wait did he leave anything
No except his scarf that I'm wearing
M. Friend 4: hey guys have you seen muzan ( he never used his real name it just made him feel like shit when he used so he used muzan that's why everyone calls him by that )
I friend 4 he left last night leaving letters for izumi and his parents
Yeah he did mine was nice ( also the two groups know about everything as they saw him very pissed one day and had to calm him down before he strangled a random person ) but the to "mother" and " father" not so much
M. Friend 2: well serves them right
But last night he got the one thing he's been trying to do for years done
I. Friend 4. That is
Very few knew about this as he didn't want it to go to far outside of the family * looks towards his friends* you know what it is
M. Friend: h-he got it done
Yes but with a severe drawback which is he needs to consume human flesh in order to survive now but Im pretty sure he gonna let that stop him
M. Friend: theres a reason we hung out with him he's incredibly stubborn at times but he hesitant to stand up for you we did it a few times for him as well but what do we do now
We continue living for him and to make his name a good omen alright
All - izumi: alright/ yeah
Good let's hang out also he destroyed mother and fathers reputation a couple months ago
All: serves them right/ good they deserve it
Muzan pov
' I felt like shit lying to izumi but I know she took it well I hope you like the present I left you you always said that you wanted my scarf so no w you can have ' well let's go * continues walking away the city *
Years later
Muzan pov
' i'm walking with Kokushibou at my side as I'm head about a demon killing an entire dojo of students I have master's my demon king abilities and Kokushibou has made her breathing technique more powerful she is my first upper moon but I feel like she is like a clingy girlfriend but not don't mind '
Let's go Kokushibou * walks on into tthe graveyard seeing izumi there * ' this is unexpected ' * walks up to her * and leans to her ear and whispers* hello sis did you miss me
Izumi: * turns around to see her brother alive and well * b- brother is that you?
Yes it is the drawback isn't so bad you know
Izumi: who's this * gestures to Kokushibou*
That is Kokushibou my first upper moon and a demon slayer too
Izumi: oh well than I heard about the start demon that is here
It's no demon I can know everyone that I turned into a demon or is one there is no demon here at all it's a * senses a child nearby that has the scent of blood on him * child that has a aroma of sadness on him * goes to the child * hello there
????: Who are you someone who's going to arrest me
No I'm not but she* points to izumi * might I don't know you have the scent of blood on you and an aroma of sadness on you so I can't help but wonder why you have blood on you
????: They killerd her
Who did
????: The rival dojo they poisoned the well and and it killed my fiance and father in law
That is just horrible ' I said was never going to harm a another person but this an exception ' well they just horrible I have question for you would you like to become a demon after all I can erase you memories
Cliffhanger I am fucking tired do Im ending it here also when this comes out 2 more will follow it as I will make multiple chapters then publish them it's just more better for me
Edits: I checkd this chapter out to see how i used to write its... A nastalgia trip ill say. I want to know from your guys my readers, whas did y'all like about the story? That will help me write in the future. And always suggest story ideas, my brain is unorganized at times and cant think so go ahead and comment if you desire and have a wonderful day!
I changed the weird spacing and did some grammar edits. Thats really all.
-author