Got a new prompt for you! 😁
10 year old Mirio goes to the park and spots 6 year old Izuku getting ganged up on and bullied. Mirio ain't having none of that shit and immediately swoops in and saves Izuku.
The two get to talking and Mirio is immediately enamored by the cute kid who so desperately wants to be a hero who saves people with just his smile and presence, just like All Might, even though he's quirkless. Mirio reassures Izuku that he absolutely can be a quirkless hero, and that he believes in Izuku (which immediately results in the park being absolutely FLOODED by Izuku's happy tears).
Mirio basically adopts Izuku as his little brother and helps him achieve his dream. Dadzawa eventually helps Izuku with physical training. Dadmic and Auntnight help Izuku with his confidence (as well as cultivating a dramatic flair so that no one look away and dismiss him).
Izuku eventually becomes an absolute terror, and Mirio could not be prouder of his baby bro.
Okay, I had literally spent over 2 hours writing for this and then my phone kicked me out of the app and they all got deleted, so I am absolutely fucking DEVASTATED RIGHT NOW
Literally sat there for a minute contemplating life
But holy fuck, I love this so much
Big bro mirio
Sunshine brothers
I will try to make this as much like the original as I can, because I was actually really happy with it and I want to SCREAM
But I can’t. This is fine. I’m so normal and not bound by eccentricities at allllll
Kaachan had been mean to him for a while now, even more he found out about his quirk, but once they all found out that little izuku was quirkless, it was tenfold.
Kaachan had also taken to being mean to the other kids too though! And izuku didn’t like that at all! Heroes were supposed to help people, right? So, that’s exactly what he’d do!
Even though the other kids didn’t like him anymore.
Even though kaachan had a bunch of other kids on his side, and had a quirk, and izuku was small for his age
So, izuku spent a lot of his time running away from kaachan, but that was okay! At least he got the attention away from the other kid! And he was getting really fast! That’s a great trait for a hero to have!
Izuku did often get lost in his thoughts though, and he didn’t notice the bigger kid standing in his path. Until he ran into him, that is
:(( he’d be so apologetic and scared :((
Mirio is confused, but makes sure to tell the kid that it’s okay and try and help him relax!
Eventually though, kaachan and his friends (not really friends, but I feel weird calling 6 year olds lackies)
.
..
…
Eventually though, kaachan and his ✨henchmen✨ caught up to izuku and the boy he ran into
Bakugou starts his whole monologue of how great he is, and how izuku is never going to amount to anything, and his general douchebagary (I do recognize the irony of me not calling 6 year olds lackies but still calling them douchebags. My moral compass is clear to no one but myself)
Izuku expects the older boy to just walk away or to agree with kaachan. What he doesn’t know, is that mirio is going to be a hero, and that heroes do not stand for bullies!
So, he tells him that he’s not acting very heroic
Kaachan goes into his whole “i’M gOinG tO bE tHe #1 hErO AnD sUrpAsS aLl MiGhT-“
But mirio just makes an executive decision to take himself and the little green boy out of the situation
Bakugou, of course, yells at them for ignoring him and whatnot, but mirio is not bothered
Izuku, however, is shook tm
No one had ever ignored kaachan before! Or stood up for him! Or told kaachan that he was anything other than a hero! Who was this boy???
He’s togata mirio!
Izuku tries to defend the explosive boy, because really, what else do you expect a child who’s spent year being told how great this kid is to do
But mirio simply asks if heroes are supposed to bully or be mean to others
No, of course not!
So, why should kaachan be allowed to?
It take Izuku a little while to process this, but he does soon come to realize that katsuki’s actions aren’t that of a hero, and that he is really just a bully
Mirio has a little brother now
Sorry, @ his parents, you’ve got a new pseudo son!
Inko is more than happy with this arrangement, and accepts her new son with open arms
Izuku explains that kaachan and his ✨henchmen✨ always pick on him because he’s quirkless. He expects mirio to agree with them and say that he is a deku. Or to at least just leave him there
But mirio is a child of quality tm
So, he tells him that there is no reason to bully someone! Especially over something so silly! Especially over something that they can’t even control! And that izuku is not a deku! That he can be a great hero if he wants to be!
Needless to say, izuku cries
8 years later and mirio still thinks izuku has a tears quirk because the park was practically flooded
Yo, kinda sad when some 8 year old is nicer than any teacher you’ve had, but we’ll focus on that later
Anyway <3
Mirio introduces izuku to his friend, tamaki!
They’re both riddled with anxiety, but mirio is always glad to reassure them!
Izuku is also a great help with tamaki’s confidence! And both mirio and tamaki always listen to izuku’s quirk theories!
Soon, mirio and tamaki start training for UA! Mirio starts teaching izuku what they’re learning too!
Izuku is a fast learner, and he loves to watch mirio train and add ideas here and there! Mirio is so proud of his brother, he’s so smart!
Izuku is also proud of his brother! He’s so strong!
Mirio calls izuku, “little hero”
I do make the rules and I enforce them.
I do realize that this could also sound condescending, and I’m pretty sure some villains do refer to izuku as, “little hero” so I just love the image of izuku being like, “jokes on you, my brother calls me that and I take it as a compliment”
Izuku is very sneaky. I know this in my soul. He is clumsy, yes. But when he needs to be, he is very sneaky.
The celebration when mirio and tamaki get their UA acceptance letters😭😭😭
They make a new friend there too, nejire! She thinks izuku is adorable and loves when he analyzes her quirk!
Kaachan and the teachers are still assholes, but izuku is going to prove them wrong
And now, he’s going to prove all might wrong too!
After his first meeting with the sludge villain, and after kaachan being even more of an ass today, and after all might telling him he couldn’t be a hero without a quirk? Izuku has had one hell of a day. And he is feral on a good day.
Surprise to his family, but he’s also been training with knives!
I just think feral izuku deserves to have a feral glint in his eye, and run like a mad man towards a villain while holding a knife, all while kaachan, who has bullied him for over a decade, watches in terror and confusion (my sibling drew a picture of this for our au, and it is very dear to my heart)
So. Mirio and inko are HORRIFIED ONCE THEY SEE THE NEWS, OH MY GODS, IZUKU, ARE YOU OKAY? WHERE IS HE? WHAT’S GOING ON? WHAT-
So, they try to call him, but he’s busy talking with all might, who offers him OFA!
But, izuku is nothing if not determined, and he is going to prove everyone wrong and become a hero his way!
All might apologizes for his earlier actions and tells him that he can’t wait to see izuku become a wonderful hero!
When izuku gets home, inko immediately calls mirio, who shows up faster than he really should have? Are you okay? Did you steal a car?
Let’s not worry about that 
They do make izuku go to the hospital because when a sludge villain inhabits your body, you get checked out by a medical professional. No ifs, ands, or buts.
Kaachan is still an asshole, but leaves him alone a little bit after that.
Time goes on, training continues, mirio, tamaki, and nejire are doing great at UA, and HOLY SHIT, IS THAT ALL MIGHT TELLING IZUKU THAT HE GOT ACCEPTED INTO CLASS 1-A?!
Izuku tells mirio and his mother about how nice Uraraka was to give him some of her points????? Someone was nice to him. He’s emotional.
Me too, kid
But he hopes that they’re in the same class!
They are!
Sadly, so is kaachan.
Eraserhead is their teacher, holy shit
Also, let it be known that mirio tells mic that, after the entrance exam, izuku talked about mic nonstop for a solid week. Mirio brings this up when he, izuku, and mic are all in the same room too. Mic and midnight both think it’s adorable
At the quirk assessment test thingy (QAT), people are kinda like, “hey, hey, green kid, what’s your quirk? Why aren’t you using it? What’s up?” And he tells them that it’s a surprise
He doesn’t use it the whole time and they’re all confused
Bakugou ruins his fun and tells them all that he’s quirkless. What he doesn’t expect, is for all of them to be impressed and supportive
Izuku cries and Shouto theorizes that he isn’t quirkless, and that his quirk is actually about his ability to cry
Across the school, Mirio senses someone else recognizing his brother’s hidden quirk
Mineta doesn’t exist.
Bakugou gets expelled. (WHAT DO YOU EXPECT TO HAPPEN AFTER HE TRIES TO BLOW IZUKU UP ON THE SECOND DAY OF CLASS?!)
All is right with the world
Oh shit, villains are at the USJ and mirio’s feral, accident prone baby brother is being attacked and he only found out because some kid with engines in his legs ran back to campus and had a panic attack
Poor Iida :(
But they get everyone back! Eraserhead and izuku are a little worse for wear, but they’re alive!! Huzzah!!
Aizawa decides that he likes this feral child even though he is a problem child
Fine, because he is a problem child
*mic sits smugly in the corner*
He’d be filling out the adoption forms right now had he not seen what a lovely woman inko was.
He still has the forms, but don’t tell anyone
I’ve said it several times, but izuku and mic start a JSL club. Mirio is very proud of his brother, and is the first to join
He already knows some because izuku is hard of hearing, but now he has structured learning!
Mic and midnight 10000% dub them the sunshine brothers
Shouto asks if they’re brothers
Izuku says that they are
Izuku is the feral gremlin of UA and class a loves him
Shinsou and Shouto: “I’m not here to make friends”
Izuku: :)
Mirio, knowing how this will end: :)
Aizawa, knowing that his problem child sees right through this: *sigh*
Mic, knowing that his little listener is going to be best friends with them: :D
Midnight, knowing this kid could demolish the world if he wanted to: :))))
Inko, sensing that she’s going to have two new sons soon: :)
Anyway. They’re friends now :)
Ah, Hosu.
Aizawa had hope that Iida would remain a responsible figure in class.
That goes out the window when he is told that three of his students are in the hospital because two came to aid him when he tried to commit premeditated murder
Mic is stressed when his husband has to go to Hosu to collect their child and his friends.
Inko is horrified when she hears that her son got caught up with the hero killer, but is also so proud of her chaotic gremlin
Nobody is supposed to tell mirio what happened, but Shouto thinks that izuku’s brother should know
He is later asked what he told his siblings, and only then does he realize he never did tell them.
He tells them later, “during the internships, my friends and I fought stain. Not endeavor.” And then spends the next hour trying to calm Fuyumi down, but really just makes her more stressed.
He tried.
I’m so sorry, fuyumi
“Why didn’t you tel us sooner?!”
“Well, I tried to fight the police officer after he told us we couldn’t tell-“
“YOU FOUGHT A POLICE OFFICER??”
“Did you win?”
“NATSUO!”
“Midoriya held me back”
“THANK KAMI-“
“Damn”
Midnight pseudo adopts Shouto
I need you to know this.
She sees this sarcastic, oblivious little shit and snatches him up
Mirio is so happy that his brother has so many friends TwT
The entirety of class A + some in class B and mei and shinsou love him and he gained two fathers and an aunt
The sunshine brothers soon adopt a sister!
Eri!
Kirishima, tsuyu, Uraraka, and nejire are also now able to witness izuku going completely feral!
It’s great
A lovely bonding experience!
But yes, new sibling acquired!
They are now the sunshine siblings or the sunshine three, thank you mic
Inko loves her new daughter
Mic and midnight (and Aizawa, but he’d never admit it) both have separate folders on their phones for pictures of the three of them together. Tokoyami never thought you could see serotonin, but after seeing one of the pictures of the sunshine siblings all smiling at the camera after making each other flower crowns and getting candy apples, he admits that he has been proven wrong
This wasn’t as good as the first one, but I still hope you like it!!!!!! This prompt made me so happy 😭😭😭
found family >>>>
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