I can take any mischaracterization of any character (lie) except sakusa's because he's probably the most straightforward character ever and any mischaracterization of him feels like illiteracy to me sorry
In honour of Miya Twins' birthday I'll just drop some headcanon that's been simmering in the soup
Mama Miya was a professional volleyball player but was forced to cut short her path to go pro since she got pregnant young. (needless to say the dad ran)
Being a single mom in her 20s was difficult, not to mention she's having twins. She wasn't the greatest cook ever.
The twins implicitly knew that their mama is working hard alone, so they'd usually help out with chores or anything they could do.
Osamu frequently helps with cooking.... and I want to say that's where his love for food comes from. He understands that despite his mom not being the best, she still cooked for them everyday, so he will savour every bite and every single grain of rice....
While I want to say Atsumu got the love for volleyball from his mama... Not that he's going pro for her sake, but that he wants to go pro to show his mama the view from the top... I also wanna think that Atsumu's twisted personality probably comes from his mama when she was still playing volleyball too (super good and cocky).
Seeing her boys got all her traits probably made Mama Miya super happy lmao (they even got her looks!) and I think... even though she was having such a tough time in the past, she felt that it was worth it to have both twins (because both of them have each other's back)...
I imagine Mama Miya gets hit on a lot too and the twins fucking hate that shit so they hiss and bark like animals when a guy gets too close.
I think the twins definitely coaxed their mama into playing volleyball again... So when the twins went off to pursue their career, I'd say she started out joining local groups too :)
atsumu getting "secretly" married and no one knew about it even though he posted it constantly on instagram because he posts so much stories that not even his most insane fans would check every slide. he sandwiches ONE (1) post about his spouse and marriage life within 5 other different posts about his lunch and no one bothers to read it. his PR team is sick of him pulling this stunt (they're the one checking each slide and grilling him for it) but he never gets caught. unbothered king.
imagining sakusa being hilariously bad in fan events because jesus christ he would actually rather die than to be in a crowd, shaking people's hands, or getting literally and metaphorically flashed (by people and cameras). his ass is NOT smiling, not even a forced one, you either get one with him scowling under his face mask or you get nothing. NO aegyo, NO fanservice. his manager is not letting him speak and tank his rep.
his social media is managed purely by his PR team. he has not updated his personal account in 3 years. the only updates his fans get are blurry paparazzi pictures that are 5 miles away and it makes him look like a cryptid. in universe fans rely on every frame of interviews and matches they can scrounge up for photocards. one day when fans wake up and found him in collab with a sports brand all of them collectively sobbed and was congratulated by fans of other msby members. sakusa fans are the strongest soldiers for real.
atsumu, who's clumsy at comforting people, panics when he sees you crying, but like anyone, he wants to cheer you up. he doesn't care if he's ditching practice (he told kita-san about it later, and kita-san got so surprised at his reasoning that he lets atsumu go just this once), he stays by your side, fiddles with your shirt, while the two of you sit against the wall.
atsumu stays quiet. he doesn't really know what to say, and knowing himself, he didn't want to accidentally say something so stupid it makes the situation worse. but he lets his mouth run anyway.
"did ya know," atsumu cleared his throat. "yesterday i had a nightmare, right?"
you stopped your sniffling for a moment and stared at him, and despite not being there when atsumu had his nightmare (because you're at your house... sleeping?), you gave him a nod.
"i woke up, and i was scared outta my mind. so i went to the kitchen to find somethin' to eat. somethin' to ground me." atsumu continued, recounting the events the night before. "i took the first thing i found. a lil' puddin' cup, and downed it."
uh oh. you've heard this story before, and you knew how it ends. your tears dried, and you leaned in a little closer to atsumu.
"and then god knows why 'samu woke up. didn't even say anything and he whacked my head! he whacked me! after i had a nightmare!! what kinda brother does that?!" he whined, loudly, throwing his arms out in the air.
you paused, just looking at atsumu being petulant. and then a chuckle escaped you. a wry smile etching itself on your face. the edge of your eyes crinkled without your notice.
"and i had to buy a new one for him. at 3am!! ya seein' my dark circles today?! blame samu."
his voice continued, your laughter echoed through the space in tandem with his whines.
atsumu, who's clumsy at comforting you, panics when he sees you crying, but... at least he could make you smile again.
people think that sakusa spoiling you meant "he'd give you his credit card to spend on whatever you want" but instead it's actually "he'd handmade your favourite food from scratch with sufficient caloric intake because no way in hell he's risking food poisoning with crap from outside" AND "he'd store all his payment information on your phone and you can buy whatever except food from outside".
sobbing can you imagine using his card to buy stuff like lingerie to surprise him (because he'd be the kind to check his transactions) but instead the surprise got revealed way too early because the bank blocked the payment and called him for "suspicious purchases"
genuinely crazy to me that furudate-sensei puts post-timeskip kuroo in a suit and called it a day and it works so well that the fandom collective crowned him Daddy like wow they really cracked the code just like that
miya twins where one of them came back wrong and they have to cope with the unease that's just plaguing their every day life where things could appear normal for outsiders but for the twins something is constantly slightly wrong...
osamu talking a little less about food, being a little more picky about the rice in his mouth, frowning when his soup is a little cold. his onigiri packs a little less rice. he doesn't get up in the middle of the night anymore to scrounge for snacks that atsumu ate. his favourite pudding brand changes as if he doesn't know the difference.
or.
atsumu who looked like he didn't change much, but he doesn't give osamu looks anymore when he failed a serve, he doesn't glare, just nothing. he just cursed at himself and shakes it off. he doesn't recognize the different rice that osamu uses in his onigiri when he ran out of the ones he usually uses. he puts in a little more protein powder in his water bottle. he still bleaches his hair.
just the little things slipping through the cracks....
people think that sakusa spoiling you meant "he'd give you his credit card to spend on whatever you want" but instead it's actually "he'd handmade your favourite food from scratch with sufficient caloric intake because no way in hell he's risking food poisoning with crap from outside" AND "he'd store all his payment information on your phone and you can buy whatever except food from outside".
sometimes when i get too deep into a headcanon in my mind id worry if my perception of the chara is too screwed up, and then i would reread the whole manga all over again to make sure i dont accidentally mischaracterize them (or ill die)
A little something. Boys are written with "during school" (pre-timeskip) in mind.
Hinata Shoyo
( Your period ) never really did register to him until Yachi mentioned her monthly woes.
Will drop you food and snacks at your table. ( "It's to repair your body!" )
He will make sure you're healthy even if it meant dragging you out to exercise.
Sometimes he avoids eating ice cream or drinking cold drinks in front of you.
If you get skin outbreaks, he would consult Yachi on skincare products. He also goes shopping for you when you don't want to go out.
Kageyama Tobio
He's aware of periods because of his sister but never dug too much into it.
He's familiar with mood swings, with the blood, but that's pretty much it.
Wished he paid more attention to Science class but because he didn't, he bought books to teach himself instead ( The science jargon hurts his brain, what the hell is "corpus luteum" )
In the end he relented and read up on blogs,
Has a notebook to write about your condition so he knew what to look out for in the future ( he even has tags on it ).
He buys you every one of your cravings when he can.
Doesn't know when he should give you your own space, so he just tails you around until you tell him...
Kozume Kenma
He has a decent amount of knowledge on periods — he carries extra pads, pain meds, and hot tea around.
He hates exercising, he is not going to force you to do it, but he does have Wii Fit... Maybe it will encourage you to work out a little...
Brings his gaming console for you to vent out your frustrations on games but sometimes it kind of makes you worse so he prepared snacks for that.
He sets up a kotatsu just for you if you're the type to feel cold easily.
He hates skincare products on his face, but would tolerate it if you're the one doing it with him. ( He started buying a lot just in case yours ran out )
Kuroo Tetsurou
Extensive knowledge but most of it are just theoretical, not practical — He knows which hormones get produced, but that's not entirely useful
He texts his older sister with 0 shame, asking her for tips. i like to think that his sister would immediately know what's happening and be helpful about it.
Brings around a separate bag that has all your hygiene products and essential medicines.
Very, very, very caring. He will stay by your side at least 50% longer than usual to make sure you're okay.
Would not allow you to leave the bed if you're unwell. Breakfast, lunch, dinner, he'll serve everything and anything to you.
If it comes to it, he'll even carry you around if you asked.
He'd steal Kenma's games for you.
Miya Atsumu
God help him and especially you.
He tries really hard to be helpful but he does not listen to classes so while he knows (1) Period is a monthly-ish thing, (2) Mood swings happens, he does not know that it happens for DAYS, or that PMS is even a thing.
A part of him wanted to wing it but a bigger part of him won't forgive himself if anything were to happen to you, so he studied up very diligently. ( he even went to Kita-san for help )
Installs a monthly period tracker app on his phone, he forgets to set it up sometimes though.
Never forgets to bring his jacket with him when both of you are heading out. ( Just in case! )
Spoils you extremely thoroughly. Physical affection? Emotional support? Cravings? You name it, he'll deliver.
He punishes himself if he forgets to bring an extra pad/tampon with him, to the point you started to remember to do it yourself instead.
Both of you had skincare sessions together.
Miya Osamu
If you expect him to be better than Atsumu then I'm sorry to say no he isn't.
Suna had to bring it ( the period ) up for him to go "AH YEAH That's a thing"
He's better in a sense that he researches food that repairs your body instead - and will cook for you daily ( homemade bento for the win ).
The food gets stolen by Atsumu sometimes so he makes a bit too much.
He's very diligent in your meal timings and by extension, when you should take your medicine and supplements.
He has specific timers for it, and yes, he also has a period tracker app on his phone, he remembers to set it more often than Atsumu though.
Ushijima Wakatoshi
He may be aloof, but he's actually really observant! He knows it's your period when you start feeling off.
Wakes up in cold sweat as soon as you get cramps and immediately checks up on you.
Warm water, pain medication, supplements... He prepares everything for you and sets it on your bedside.
Would cut short his volleyball practice if it meant making sure you're okay.
He doesn't mind indulging your cravings but he would still keep an eye on your diet ( he has books on what to eat ).
He brings you to exercise/jogging around town and slows himself to your pace, when you want to rest he'd let you. He rewards you once you're done with the goal.
He runs hot enough to be your personal heating pad and he doesn't even mind it.
Sakusa Kiyoomi
Extensive knowledge in menstrual cycles, both theoretical and practical.
If this is a tier list he'd be getting a whole SS+ Grade in period care.
Extremely clinical but that's how he cares about you: regularly changes your sheets if you stain it, prepares a separate bin for blood-stained laundry, never runs out of hydrogen peroxide.
Foods rich with nutrients, adequate supplements in the cupboard, any and all kind of medication in the bathroom... This pain medication makes you nauseous? He has an alternative prepared already.
Never ever forgets extra pads/tampons, regularly boils and disinfect your menstrual cup.
He doesn't need a period tracker app, he IS the period tracker - knows when your next cycle is before you even realize it. If you have irregular cycles, he studies and adapts instantly.
He makes you exercise though, but won't force you if you're really unwell.
i have a draft (period headcanons) ongoing for months now because I will only work on it when I'm at my monthly bleed but maybe today's the day I finally finish it up....
sakusa being awkward as hell in relationships because why aren't you Initiating cuddles and kisses (because yknow, you respect his boundaries) so sometimes he'd plant a kiss out of the blue before pulling out wet wipes and wiping his saliva away from your face
imagine dating sakusa and living together and when you decided to finally ask him "do you want dinner? shower? or... me?" when he came home he replied "shower" with zero hesitance.
or when you want to hug him he'd take a step back and lint roll your clothes, clean your hands with wet wipes, lint roll his clothes, sanitize your whole body (and his), and then he'd hug you.
or when you wanted to feed him from your own utensils he just wrinkles his nose and shove a clean small plate for you to put the portion down so he can eat from that himself, with his own utensils.
no matter how much you cry about him being too clinical, too clean, not considerate enough, he just frowns without saying anything, but still continued maintaining his routine. you thought about breaking up with this guy, until you realized the way he pays attention to you.
he uses cleaning chemicals that doesn't irritate your skin, the plushies he bought you (against his will) were dusted and sun bathed frequently, he mixes veggies you hate into your food without your notice for a balanced diet.
you get sick less.
you got healthier.
you probably won't die a little too quick.
you could most likely stay with sakusa a little longer now.
