#deaged katsuki

[the-final-sif]

A villain with a deaging quirk has surfaced and begun to cause mischief. Katsuki, ever the prepared child, writes and sticks a note in his hero costume. The villain hasn’t operated in his area yet, but you never know.

The note has basic instructions for his child self, the first part being who he is, how old he should be, and that he's a student at UA. There's directions there for his child self to get back to UA from whatever situation they're in, and then he's got a list of "Safe" people, along with a few phone numbers.

Aizawa is at the top of the list, followed by Ectoplasm, then Mic, then All-Might. All-might is at the bottom of the list, and has been since before the kidnapping, since he's bad at using phones. Below that, Katsuki has a list of his classmates, since he might be out with them.

Each person has a quick sketch, and Katsuki's nickname for them, along with notes for interacting with them. After the list of people he has general guidelines for his child self to prevent any mishaps.

-> Deku ended up getting a quirk. It let's him break his bones even faster. Don't make a big deal out of it.

-> Kirishima can be trusted for almost anything, but do not let him pick out clothes for you. Do not let Aizawa pick out clothes for you either. Pick out your own clothes or have the bird-head guy do it.

-> Denki, Mina and Sero are trustworthy to get you out of danger, but do not listen to anything else they say.

-> The skeleton guy is actually All-Might, he's not making that up.

-> Interact with as few people as possible. Talk about yourself as little as possible. They know almost nothing about me, and I want to keep it that way.

There's a full three pages of notes and thank god there is, because newly childified Katsuki reads through all of them after he escapes from the villain who came out of no where to attack him. By this point, his teachers know what happened and everyone is panicking because they've completely lost track of  him. Then Aizawa gets a call from a random phone number, picks it up, and it's Katsuki using a payphone or something.

They were expecting this to be a total nightmare, but nope, Katsuki knows what's going on now, he knows it's probably temporary, and he knows what to do. Aizawa comes to get him, and Katsuki is somewhat well behaved. At the very least he's polite. They find out it only lasts like 2 days, so Katsuki is staying at the school. All his classmates are expecting this to be the perfect chance to get all the embarrassing details on Katsuki. Instead it's 2 days of his child self not falling for it and roasting the hell out of all of them. His older self left notes for insulting people, and Katsuki prides himself on going above and beyond.

Child Katsuki knows he has near complete immunity for the next 48 hours and by god is he going to use it. The only person spared from his wrath is Aizawa, who Katsuki made a note for his child self to be nice to. The other teachers are not spared from child Katsuki's roasting, not even All-Might once the idol-eyes wear off. Aizawa, though, oh he doesn't get a single real insult. When he says to do something or stop something, Katsuki listens without much guff.  And Katsuki actually says several things that could almost be counted as nice. When Katsuki's in bed on the second day, ready for all of this to be over, Aizawa gets a chance to look at the note with the directions. He can't help but grin as he reads through Katsuki's descriptions of his classmates, Mic being called a "cockatoo on bath salts" and notes about where his spices are in the cupboards.

For Aizawa though, there's a slightly better sketch then the other little doodles, and no nickname. Not like the others.

"Homeroom Teacher: Shouta Aiwaza, Eraserhead, Aizawa-sensei"

Then below that, a single sentence, unlike the others that have several notes on dealing with them.

"Be good for him, he's been through a lot of shit for this stupid class already."

It’s one of the little moments when Aizawa knows for sure he made the right choice when he decided to become a teacher.

[the-final-sif]

Adding to my previous posts on “Deaged Katsuki Would Be A Demon Child”. What would happen if Katsuki wasn’t the only one deaged?

Let’s say Katsuki gets deaged with someone else during a mission, back to around 6-7 years old. It’s only him and the other person, and they’re in a hideout swarming with bad guys. The villains go after them thinking they'll be easy pickings now.

If he’s deaged with Izuku, then Izuku has no idea he has a quirk, and goes back to his childhood fear/being frozen in the face of dangerous. Alone, he would’ve probably been easy to kill. However, he is not alone. He’s with Katsuki.

Unlike Izuku, Katsuki is a hell child with explosions coming from his palms, too much combat knowledge for a 7-year old, no self-control, and A Willingness To Kill. 7-year-old Katsuki has no concept of mercy, he’s determined to destroy all the bad guys and get his crybaby friend to safety, and the villains quickly realize They Have Made A Mistake. At least older Katsuki was obligated by law to only do so much damage.

Kid Katsuki protects Izuku fiercely, getting both of them out of the villain’s base and to safety. Maybe he even gets hurt in the process, but he's okay because heroes have to get hurt sometimes to win the fight! Everyone is torn between being impressed and scared, because holy shit, maybe a 7 year old shouldn’t have constant unlimited access to explosives.

The deaging quirk will wear off on it’s own eventually, so in the meantime Katsuki is bandaged up. Both of them are told they are students at UA, and All-Might lets both of them know that Izuku does actually get a quirk, but it’s a very powerful and somewhat dangerous one which is why it took so long to come in. Excited by the knowledge that they are actually becoming heroes together, Katsuki and Izuku spent the rest of their time as little kids running around together causing chaos. Class 1-A watches as they play kid games, go on “missions” together, and nobody misses how little Izuku looks at Katsuki with stars in his eyes. Just like big Izuku does.

After having seen Katsuki take on multiple full-grown adults and win, the rest of the class is starting to understand why.

Or

Another option is he gets deaged with Shouto. Katsuki doesn't know who this weirdo kid is, but he still does everything he can to keep Shouto safe. That's a hero’s job after all!

Shouto is torn between letting this loud but nice explosion kid protect him and protecting him back because Shouto is supposed to be a hero too! Ideally the LOV isn't the one behind this attack, but they are nearby. Or, at least one of them is.

The fight is turning nasty when Shouto hears Dabi’s voice and he recognizes his big brother’s voice, putting Dabi in a really fucking awkward spot. Dabi’s not in Shouto’s line of sight, but he can see Shouto and Katsuki, and he can absolutely hear Shouto calling out for Touya. At first he tries to ignore it, until little Shouto demands his big brother stop playing around because it’s not funny anymore, Touya. Where are you? Please, it’s really scary here! Big, round, mismatched eyes start welling up with tears, and for all his heartlessness, Dabi is only so strong.

Dabi ends up rescuing both of them, burning the people they’d been fighting to ashes. He gets them both to safety, and it’s only then that his little brother is able to get a proper look at him. Obviously, he expects that to cause some issues. Kid Katsuki isn’t so sure of this strange man, but Kid Shouto asks one quiet question as he stares into familiar blue eyes.

“Is it- Is this really you Touya-nii?”

“Yeah. It’s me kiddo. Bit hard to explain right now, but I’m still me. I promise.”

After several long seconds of silence, Dabi nearly ends up in tears himself when his little brother reaches up to touch his scars with a gentle little fingers. Little eyes watch in wonder as he confirms they’re real, and then Shouto gets super excited because he thinks Dabi’s scars look super cool. It’s so awesome that he’s not the only one with a scar anymore, and his big brother has gotten so big and strong! With how he took out all the bad guys back there, he must be a hero by now! Katsuki agrees, he thinks Dabi’s scars look badass and he’s a bit jealous that Shouto has a hero for an older brother.

Giving in to temptation, Dabi runs around with the two little kids for a day or two, playing keep away from the very worried heroes. They have an awesome time, and Dabi decides he likes the explosion kid too.  A small part of him wishes it could stay like this forever, but it can’t.

When it’s almost time for the quirk to wear off, both kids are exhausted. Once he’s sure they’ll be safe, Dabi drops two sleeping troublemakers off right outside UA, where they’re found mere minutes before they turn back into teenagers.

Nobody knew Dabi had them the entire time, and neither Katsuki or Shouto recall what happened when they were deaged. The only hint they have is that kid Shouto mumbled out a very sleepy “Touya? You’re back again?” when Kirishima finds them. In the end, everyone assumes Shouto and Katsuki must’ve found their own way back to UA, and that’s that.

Dabi knows what really happened though. He’s got a few new photos carefully hidden on his phone to prove it.

[the-final-sif]

So I’ve talked about a deaged hell child Katsuki with one other person, and I’ve had him deaged on his own, but what about a deaged Katsuki with two other people?

Somehow, Izuku, Katsuki and Tomura all get deaged together in a dangerous situation. Izuku and Katsuki were fighting Tomura when someone on Tomura’s or a third party’s side ends up hitting them with a deaging quirk. Despite starting at different ages, they all end up about the same age (7 for Katsuki and Izuku, 8ish for Tomura), none of them have any memories of their older selves, and bad guys are closing in fast.

Katsuki reacts first, fighting back and clearing a path that lets the three of them run off, though they’re still in danger. Whatever group is attacking them either is against both the heroes and the LOV, or if they hit Tomura accidentally, don’t know how to convinced him that they’re on his side. By this point, Tomura has only been with All for One for 3 years. He’s not fully committed to the villain ideals yet, all he knows is there are lots of scary adults around, and these kids he’s suddenly found seem much nicer.

Once they’ve got a hiding spot, they’re all upset and confused, but Katsuki takes the lead and formulates a plan to get them out of there. Tomura is scared of getting too close to either of the other two because of his quirk. Thankfully, their hero costumes/clothing got shrunk with them. Katsuki takes Izuku's gloves and cuts two fingers off each glove for Tomura so his quirk won't activate by mistake. That leaves them free to work on escaping and gets Tomura to trust Katuski.

While they’re trying to escape, Izuku and Tomura keep arguing over various aspects like murder or do not murder. For some reason, the two of them just do not get along and keep getting distracted from their escape to fight. Katsuki is the tie-breaker/babysitter dragging the other two around with him, getting more and more exasperated as time goes on.

In the end, they’ve got a single slim chance to escape, and Katsuki makes the choice to stay behind and fight. This gives Izuku and Tomura enough time to escape together, though neither of them want to leave Katsuki behind. He pretty much forces them into it, telling them he’s going to fight anyways and if they don’t leave it’ll be a waste. Putting their differences aside, the two manage to escape and get help. Katsuki is rescued by the pro-heroes shortly afterwards, but he's pretty beat up.

That's when little Tomura and little Izuku finally find something they agree on. The same thing they agreed on as adults (or adult and teenager). They both think Katsuki is pretty damn cool and both of the are determined to be his friend.

The heroes are working on finding a way to restore the kids back to their normal age, but until then, they decide it’s best to keep all three together under Aizawa’s care. Tomura doesn’t really trust any of the adults, but he’s willing to listen to Katsuki/Izuku when they tell him someone is safe and/or not to murder peope. Also, Tomura doesn’t have great control of his emotions/quirk, and the gloves don’t work when Tomura is really upset, so Aizawa’s their best option for controlling his decay.

Aizawa, while babysitting the problem children, overhears Tomura talking about Katsuki. Tomura’s going on and on about how Katsuki's the coolest hero ever, Tomura's going to fight alongside him one day, and he’s going to be Katsuki’s best friend no matter what. It makes Aizawa break into a cold sweat as he tries really, really hard to not say anything. He then notices, disturbingly enough, Kid Izuku and Kid Tomura talk about Katsuki in the exact same way, and okay, maybe he's starting to understand why Katsuki gets so annoyed with Izuku, if this is what the kid was like growing up.

While Kid Katsuki is recovering from his injuries, he’s very sleepy and compliant. As a result, Kid Izuku and Kid Tomura get into constant arguments over who gets to play with him, tugging him back and forth between them. It’s all out war between the two, their former truce from the escape forgotten.

Aizawa and All-Might are watching the three of them and both trying their best to not point out how it's the kidnapping all over again but on a smaller (and cuter) scale. Of course, after a little while Katsuki gets sick of their shit and goes to hide in All-Might's lap (Aizawa already has a cat on him), and then All-Might gets death glared by Tomura and Izuku for stealing their friend. It’s all the two teachers can do to not break down laughing.

[the-final-sif]

Okay, so I’ve seen a handful of bnha fics/ideas where someone gets deaged, but I’ve yet to find a “Katsuki gets deaged” fic that I think really embraces the full potienal of Chaos Gremlin With Access to Near Unlimited Nitroglycerin Is Unleashed. I’ve got some ideas to fix that.

What if he got deaged, but under dangerous circumstances?

Maybe after capturing Katsuki for a second time, Tomura has a shiny new plan for converting him to villainy. Clearly, the issue was they didn't get him young enough. He needed to be younger and not brainwashed by hero society, so he could truly understand where he belonged. Using Quirk Fuckery, they deage Katsuki to like 6-7. If they did their research and plan it right, they could convince him that they recused him from some dangerous situation. Kid Katsuki buys it, and they convince him he's being raised by them to be a special hero. He has to be very careful though, bad guys are trying to lie to him to take him away from them. The LOV is then running around trying to raise this little kid, keeping him in the dark about their true intentions and mission, all while keeping him away from the heroes.

Eventually, Izuku manages to reach Katsuki. Using facts from their childhood, secrets nobody else would know, and showing him proof they’re in the future, Izuku is able to convince Katsuki to come with him. Unsure, but trusting his childhood friend who is now LARGE and has a COOL QUIRK, Katsuki and Izuku escape back to UA. At UA, all his supposed friends sequel over him for a bit, a bunch of weird adults ask him a lot of questions about the people who were taking care of him, and then they finally reverse the quirk effects.

  OR

Kid Katsuki is deaged by Tomura hoping to convert him to a villain, but he doesn't buy that shit for even 1 (one) second. He can smell a liar a mile away and he has even less self-control and self-preservation than Big Katsuki does. After about a minute of hearing Tomura spew bullshit, he attacks them and manages to get free.

The problem is, Katsuki has no idea what's going on or who he can trust. He does figure out that he's in the future, and he’s able to guess was a quirk. Peaking through his pockets reveals his dorm keycard that lets him know he’s a student at UA. Great! All he has to do is get back there and someone will know how to help him reverse this quirk.

Only... he's on the other side of Japan from UA. So little Katsuki embarks  on an adventure to return to UA, all while keeping away from both the LOV, and his poor teachers/classmates who he doesn't realize are his teachers/classmates. As far as he’s concerned, his never seen those people before in his life, and the villains tried to say they were on his side too. Using his own wit, small size and explosions, he makes his way home.

Katsuki is badass little 7 year old, and in the end he dodges a final attack by the LOV and makes it to UA in the nick of time. Using his ID card to get back into the school, he consults a map, and walks himself right over to the nurse's office to ask for help with getting big again. Recovery Girl is out, so he waits there for a few hours until someone finally finds him sitting outside her office, playing games on his phone. For the past few hours the heroes had thought the LOV’s attempt succeeded or killed him, because he completely disappeared off both group’s radar.

Aizawa has been losing his mind with worry, totally convinced he’s lost his student again and it might be for good this time. Then his phone rings and it’s Recovery Girl calling to let him know that Katsuki’s been at UA for the past few hours and he’s totally fine. Restoring him to his proper age is easy enough, but everyone is now 10% more afraid of him because wtf he was like 7 at most. 7-year olds aren't supposed to be able to do all that shit. Izuku is the only one whose not even the least bit surprised, and honestly wasn’t that worried about kid Katsuki.

There's also some really, really good angst hiding in there if they question Katsuki before he’s made big again. Kid Katsuki escapes from the LOV all on his own and finds his way back to UA. It's very impressive, but his teachers are baffled. Why didn't he just go to the police? Why didn't he trust the pro-heroes who were trying to save him? Why didn’t he go find a pro-hero to help?

Kid Katsuki is confused and upset by these questions. Why would anyone be coming to save him? He's 7 and he's got a strong quirk, he's supposed to be able to take care of himself. Other people shouldn't need to waste their time trying to protect him.

It lets them see a glimpse of just how deep Katsuki’s difficulty in relying on others runs.