#but i do hope yall enjoy this | Explore Tumblr Posts and Blogs

cashmoneyyysstuff · 8 months

Text

déjà vu

déjà vu : a french term that translates to "already seen." It is a phenomenon where an individual feels a strong sense of familiarity or recognition with a current situation.

bnha chap. 362 n 403 spoilers ! childhood friends to lovers can you tell i'm inlove with this trope oooorrr…, angsty?? bittersweet hurt/comfort ?? fem reader, reader's height isn't specified but is shorter than katsuki's, reader gets a bit insecure but katsuki fixes that up rq, reader is very mushy n inlove with katsuki, (but aren't we all) katsuki loves reader very much in return

in his final moments, katsuki thinks of you.

he thinks about primary school. you’re both ten, double digits. foolishly believing you were all grown up. katsuki’s fingers are white and dry from cleaning up the chalkboard, since you guys were tasked for clean up duty today.

or at least, you were. but your classmate suddenly vanished without a word and katsuki, as nice and helpful as he was (to you, at least) decided to stay behind to help you, don’t ask him where your cleaning buddy went, he has absolutely no idea and has absolutely nothing to do with it. at all.

“ y’know—” he starts, soaking the soggy sponge into the water bucket next to him, then squeezing it out. “when we’re done with this stupid school stuff, i’ll go pro.” he states, slapping the sponge onto the board, creating a loud splat noise.

you, having heard this time and time before, simply look at him and smile, placing your classmates chairs on top of their desks row by row “mhm, i know !” you grin “ 'n you’ll be number one, right ?” you’re standing in between two desks, hands playing with your uniform skirt behind your back.

“hell yeah i will !” katsuki boasts, smirking. he scrubs at the board a little more vigorously.

“bad word !” you tease, giggling as you point at him “ 'm gonna tell miss you said a cuss word again !”

he huffs, turning around to scrunch his nose up and stick his tongue out at you, you stick yours out back playfully. “as if i care ! yer too much of a wuss to snitch on me anyways.”

“no I’m not, i’ll do it right now !” katsuki rolls his red eyes at you, returning to his task and wiping the board down in a zig zag motion. “ i don’t care” he reiterates.

you pout at his back and just then get an idea you’re sure will piss him off, a cat like grin pulls at your lips.

“okaaayy … then i’ll just tell your mom !” you sing, bursting into giggles when he swiftly turns around and waves the wet sponge in your direction. he’s too far to reach you but you dodge anyway, just to mess with him.

“no you won’t.”

“yeah, i will !” you counter, blowing a raspberry at him. you both break out into a fit of giggles when he aggressively dips the sponge into the water and flicks the droplets at you once more, before he decides to close the distance and chase you around your cramped little classroom growling and screaming, threatening you with the dirty sponge.

you’re squealing and giggling and laughing, trying to fend him off with a broom and even then, at ten. then when the concept of cherishing memories of the time you spend together wasn’t even an afterthought in his mind, katsuki remembers wishing he could stay with you like this forever.

when you’re both out of breath the classroom is just as messy—if not messier than it usually is. you give eachother a look then belly laugh some more.

you’re picking up chairs again and katsuki’s helping you, so it goes even faster. you don’t wanna go home because you won’t be seeing him anymore, but you have to admit your eager to finish and leave school.

katsuki’s back is to you on the second row and he can’t see you looking at him from the back row, he decides it’s time he says what he wanted to say before you got distracted. he clutches the legs of the chair he’s holding a little tighter.

“hey,” his voice comes suddenly in the quiet, it surprises you a little, you hum in response “ 'm really gonna go pro when we’re done with school, y’know.” he insisted.

you tilt your head wearily, looking at him with his back still turned to you. “yeah, i know.” you respond “you said that already.” you’re confused, he can’t hear the scrapping noise of the wooden chairs anymore, it’s annoyingly too quiet now.

“ you’re coming with me” he pauses, turning to you a little so you catch a peak of his quickly reddening face. it sounds like a statement but even then you know better. you don’t miss a beat, nodding furiously “uhuh, always !” his cheeks flare up more as he turns fully towards you. he walks over until the only thing separating you is the desk in between. he turns his back to you again to lean against the desk seperating you both.

“you’ll be with me, and we’ll be pro's together” he maintained. he feels his chest tighten when you offer him more of your pretty bright smiles and nods, you smile at him the way he knows you don’t with the other boys in class who are stupid enough to think they deserve even a second of your time and it makes him feel a little bit more confident as he speaks more clearly “a-and I’ll be number one, and you’ll be number two. but not behind me, with me, yknow ?” he feels stupid for having to explain himself but you don’t mind, as long as you can stay with katsuki you don’t mind which number you are. you move across the table so you can stand next to him. you nod and he let's out a little huff and a smile starts pulling at his mouth.

"a-and" he gulps " 'n then—i'll marry you."

it's quiet for just moment.

and then you register what he said and feel your entire body heat up.

"w-wha ?! " you sputter "marry me ?!" your wide eyes startle him as he glances at you but refuses to look over again. he's red to the tips of his ears, pulling at the bottom of his now longer tucked in shirt. despite the growing lump in his throat, he nods.

"mhm," he kicks at an eraser laying on the floor, the only noise heard coming from it hitting a wall a little further. you don't see where, you're still looking at him. " my ma says i can't do it now, since it's...illegal, or something." he scoffs dissaprovingly "b-but..when 'm older," he sucks in a breath, then suddenly turns to you causing you to sit up straighter in suprise, you feel your hands gripping the desk tighter and tighter as your face feels more and more on fire. "when i'm older—i'll do it. that way, none of those other losers will look at you."

he looks way more flustered than you but he's sitting up straight still, eyes determined and unwavering and it knocks the wind out of you, because for as long as you can remember katsuki's been the coolest.

there's absolutely no doubt in your mind he's embarrassed. if his face wasn't a dead give away, his posture and demeanor give it away just as much. you've known him for a long time now, since you were 6 years old and he had walked up to you. little newbie you, who had transferred in the middle of the school year and with nobody to play with. he was there, head held high with his friends in tow behind him, demanding to know what your quirk was and the rest was history.

katsuki persists even when he knows the odds are low, he perseveres and keeps kicking and punching and blowing up everything in his path where anyone else would've given up while they had the chance. like when he fought against those 4th graders while you were all still only in 2nd grade. his face was all messed up and he had a nosebleed, but he ended up winning. because he swore he would keep winning.

'cus that's what heroes do.'

katsuki fights and keeps fighting even if you think the odds are low, because he doesn't. to him, there's absolutely no doubt in his mind he'd win. even here, when he isn't fighting, instead confessing to you. he's red-faced, embarrassed out of his mind and nervous, but his shoulders are squared and there's no doubt in his eyes after he had just told you he would marry you. when he thought about being older, he thought about you being there with him.

and even after what you'd heard all you can think is that your katsuki is so cool.

so with a bright smile, bright eyes and the summer sun slowly setting in your empty little cramped classroom, you give him your response.

"mhm ! "

katsuki thinks about his last year of middle school.

today's the last day of your middle school life before you go off to high school and katsuki couldn't be happier to leave this shitty school. he's 15 now. older, but besides his features, remained the same (to you, at least) .

it's your last day and you finish it off with cleaning duty, ironically, and he remembers that day back in elementary. then proceeds to shake it off, hoping to shake off the embarrassing memories. but it doesn't seem to work because it feels like the universe is seriously fucking with him.

you're the one tasked with cleaning duty again and with your cleaning buddy, yet again, being nowhere to be found. katsuki yet again staying behind to help you out. and again, katsuki has absolutely no idea where your buddy went and has absolutely nothing to do with it. at all.

it shouldn't be anything new, he stays and helps, albeit begrudingly, every time you have cleaning duty. but it feels different somehow. katsuki chalks it up to it being the end of the year.

the only difference from last time is you actually finish in record time. usually, that would've been great news, less time at school and even more free time katsuki can spend with you.

but you're quiet today.

you usually chat his ear off, and just because it's you, he chat's right back. wether you're messing around teasing each other or just talking about your day at school or who's house you're staying over at for the afternoon and which movie you're watching, you're always talking about something. it's comforting where he'd usually think it to be annoying with anyone else. but they aren't you.

and he doesn't like it.

when you finish you reach for your bag sitting neatly on top of your desk but katsuki stops you, grabbing your wrist. the feel of your soft skin has him involentarily flushing lightly, he ignores it in favor of squeezing your wrist when you don't immediately look back at him.

"what's up with you ?" he questioned gruffly. it comes out harsh, but that's not what you hear. you've known katsuki for a long time, after all. he's worried, you can tell. his words are rough around the edges but his eyes are soft, filled with care and the soft stroke of his thumb against you skin sends slight shivers down your spine when you turn to look at him shyly.

you open your mouth to deny him, but he can practically read your mind "don't give me that 'nothinngg' bullshit" your nose scrunches at the way his voice raises in pitch as he crudely mimicks you and a little smirk pulls at his face for only a moment before it falls again " don't go lyin' to me. know i hate that shit" he rasped.

you sigh, he's known you just as long as you'd known him after all.

you lean against your desk and he copies you, your shoulders brushing as he scoots himself a little closer to you. you jump up a little to sit on your desk, you're the same height as him like this. he scoots a little closer and turns to look at you, placing his hands on your desk to lean on it, fingers inches away from yours.

"i just—" you faltered "this our last day of school. when the day is over we'll be high schoolers." you stated. katsuki scoffs jokingly and leans a bit closer to you "what ? you tellin' me youre gonna miss this dump ? last i heard, you were the first one who wanted to leave so you wouldn't have to deal with mr. nakamura anymore." he jests, trying to lighten the mood as best he could, the worry in his eyes still shining bright. a smile pulls at the corner of his lips when you huff out a little giggle.

"yeah well, i won't be missing mr. nakamura. or his stupid tests" you pretend to shiver as you cringe "at all." katsuki let's out a cute chuckle. he's like a magnet, you feel yourself scooting closer to where he's leaning next to you, like you're being pulled closer to him, you don't mind. you never mind being close to katsuki.

"but..?" he coaxed, knowing that wasn't all you wanted to say.

"but.." you continue "but i'll miss this, yknow ? like—the school itself wasn't..the best" katsuki scoffs in response but doesn't interrupt "the teachers weren't either. but—i dunno—this. being here." you confess, you stare down at your shoes as you kicks your legs aimlessly into the air " we've spent such a long time here, and now we're leaving. we went from being the youngest—to the oldest, to going back to being the youngest again, and that in itself isn't the problem.."

"then what is ?" he raises a brow.

"we're gonna be in a completely different school, with completely different people—"

"but we'll be together." he interrupts "you said you wanted to go to ua too" you said you were gonna stay with me is what he wants to say, but it's childish and that wouldn't be fair to you.

"of course, i still do !" you reassure "but—there'll be tons of new, strong, cool people at ua.."

"maybe even stronger and cooler than me.." you trail off. you don't need to say more for katsuki to understand what you mean and it pissed him off.

"shut up." he growls.

"katsuki—"

"no. shut the fuck up." he's right in front of you before you can blink. you reflexively part your legs and he takes the opportunity to stand even closer to you, right in your space. you feel your cheeks warm at the proximity, you’re close enough to see it's apparently affecting him too, his cheeks turning a cute pink but as stubborn as your katsuki is he doesn't budge. as usual.

you don't exactly know what you and katsuki are. you know you like him, you know you have for a long time. and you'd like to believe he likes you too. he doesn't act the way he does with you the way he does with his other friends (or his lackeys as he calls them, you're the only one he openly calls his friend) but he doesn't really have anyone close to him besides you, so you don't know if he'd act this way with someone else.

the thought leaves a nasty taste in your mouth, so you decide to focus on something else. something else being katsuki, of course, he's all up in your space. his gaze not allowing you to look or even think about anything else but him.

"who i meet at ua doesn't fuckin' matter, they'll all be weaksauce compared to me anyway" he states smugly, causing you to huff out a laugh again " i don't care if theyre cool, or strong" his nose scrunches up in disgust as he quips venomously "i don't care about any of that—and i don't hang out with you because of that either—i fuckin' care about you because you're you."

your heart stutters.

" what, you think i hang out witcha because of superficial shit like that ? you mockin' me or something ?"

"no, no course not !" you insist, shaking your head.

" exactly, so don't..." he huffs, looking away from you towards the ground, there's a random eraser lying on the ground and he kicks it "don't go saying dumb shit like that."

"i don't waste my time with just anyone, 's why i'm wastin' it with your ass" he jokes, chuckling when you squeeze his nose in response. supressing a smile you whine at him when he leans forward to bite yours.

"katsuki, you're gross !" you giggle as you push at his face, he smiles lightly at the sound of your laughter, one of his favorite sounds. "ya started it." he disputes weakly, his smile turning into a smirk when you groan and then it falls again as he looks at you seriously.

" but seriously" he starts "i mean it, y'know. don't just say shit to say it"

"i know" you smile. he grunts in acknowledgement then continues.

"i don't care about how cool those future ua asshats are gonna be. you're different, you're not like that—i mean—that's not what i look at—what i see with you" he fumbles around for his words and groans, slamming his forehead against your shoulder. you're used to katsuki being physical, but that was usually when he was being annoying, pinching and prodding and biting at you. he's rarely ever this affectionate. it's different, but nice..really nice, so you savor it while you can. your fingers twitch a little closer to his and you decide to take a leap of faith, placing your hands ontop of his. he flinches and you're about to pull back when he grips your hands, intertwining his fingers with yours. you feel him huff into your uniform. his hair tickles as he shuffles his head deeper inside your shoulder.

"you're not like those other losers, y'not like anyone" he explains "you're—when you're around it's like you're glowing. you're bright and when you talk, everyone sorta—gets pulled towards you like you're some typa magnet" his hands get warmer against yours as he speaks. you're surprised that he sees you this way, when that's practically the same way you see him.

" you pull people in so easily, and it pisses me off that you don't realise it. you are strong, and cool and everything else but that's not all you are. s'not all i care about."

"you're annoying. and whiney. extremely annoying, actually" he chuckles, and you pull at his ear "but—" he continues "but you're..fun to be around or whatever, wouldn't be around you otherwise. you're too fuckin' nice and your taste in music isn't bad" katsuki grumbles.

he wants to say more, so much more. he wants to say he thinks the way you immerse yourself when you're watching a movie together is adorable. the way you hold yourself back from commenting during the movie so as not to be annoying, even thought he could listen to you naming street signs and never get bored. the way your eyes light up when you get your grade back for a test you had studied your ass off for, when you come to him showing off your hard work it makes him want to hold you and never let go. he wants to say the way you're not scared to banter and bicker with him, the way your nose scrunches up when you try to hold in your laughter when he passes you a crudely drawn picture of your homeroom teacher, the way you smile at him whenever you see him, whenever he shares his umbrella or your lunches even though you have your own and he has his, makes him want to kiss you silly.

he wants to say all this and more, but he knows the words won't come out right, they never do. but somehow you understand and it's another thing he admires—that he loves about you.

"i...didn't know you felt that way" is all you can quietly muster up. you're cute, he feels you squeezing his hands a little tighter " yeah you didn't, cus i didn't tell you" he ribbed. you huff out a 'dont be annoying" gruffly and he chuckles. the asshole.

your asshole, though, your heart decides.

you're both quiet, everything is quiet and you're happy, reassured. you'd be happy if this is where the conversation ended but katsuki never fails to surprise you today it seemed.

" 'sides" he squeezes your hands tighter "i promised you i'd marry you didn't i ? how can i do that if i'm not around you, hah ?"

you're heart skips approximately three beats at the memory of his promise and you lean back to look at his fully red cheeks and his fleeing eyes.

"you still remember that ?" you ask incredulously. he rolls his eyes but you can tell it's simply to save face as he responds " of course i do. wasn't that long ago."

"but—we were like—ten when that happened. "

"so ?" he responds simply "doesn't change nothin'. i told you, i don't say shit to just say it."

you're flustered and so utterly confused, but there's a happy feeling bubbling in your stomach at his words " but we're not even dating !"

"we're not ?" of course not , he knows he hadn't properly asked you to be his girlfriend. but he figured if he talked about the memory that seemed to refuse being pushed aside, he could casually sneak by what he was too embarrassed to ask. but of course, you never make it easy for him.

"no, we aren't" you pout, crossing your arms at him. he grumbles, reaching to pull your arms away from your chest but you're stubborn, he was right about you being extremely annoying. "cut that out," he hissed.

"mm-mm ! " you shake your head "you can't just decide we're together. i didn't even know you liked me like that.." you trail off shyly. katsuki looks utterly baffled "hah?! whaddya mean you didn't know ? you don't see me actin' like this with anyone else do you ?"

"that's cus you're mean to everyone else !" you choked out, puffing your cheeks out at him.

"well yeah ! but—that's the thing, i'm not mean to you !" he defends, faltering when you raise a brow at him "fuck off, m'not that mean ! i'm just messing with you !" he rebutted. you simply roll your eyes at him and after a moment he sighs.

"fine" he concedes "i should've told you i liked you, i don't just decide that i want you to be my girlfriend when it's convenient for me or something" he keeps quiet about how you could of also told him you liked him as well for now, for fear of you getting moody at him again.

you still look away from him and he groans "hey c'mon, look at me." he utters sincerely. after a minute, you offer him a glance and he takes his opportunity, turning your face towards him, holding back a grin when he feels how warm your cheeks are.

"do you...wanna be my girlfriend ?" he stammers, looking at you with his red cheeks and bashful red eyes, and yet his gaze doesn't falter.

so cool.

it's your last day of middle school, your last day before you go off to a different school with different people. but with your katsuki by your side, and that's all that matters to you.

and with a bright smile, bright eyes and the summer sun slowly setting in your empty classroom, you give him your response by pressing your lips to his softly.

katsuki thinks about the night before today, when you'd knocked at his door in the dead of night.

usually, on any other day, he'd have scolded you for being up so late but would've ended up letting you in anyway. but lately, things hadn't been as they had been before..everything happened. and he could tell you were upset, so he simply let you in without a word.

you take the liberty of laying down in his bed like you used to back at his house and back at the dorms. he doesn't mind. it feels familiar, comforting.

he lies down next to you and you immediately latch onto him, seeking his warmth. with your head in his chest, you hold onto him tightly, like he'll dissapear if you don't. he clings to you just as tightly.

"what's up with you ?" he mumbles sleepily, softer than when he would've if he were more awake, but still focusing all of his attention onto you.

he feels you shake against his chest "jus' wanted to be wif you" he hears you mumbles. he presses his lips to the top of your head, pressing a sweet little kiss onto it as you breathe "you know that's bullshit." he reprimands, he feels you squeeze him tighter. he squeezes your waist twice, his warm hands running up and down your sides "c'mon, talk to me" he prodded

you look up at him and he looks down at you. your eyes are glossy, he can tell even in the dark and he's sure you were crying a little. his theory is confirmed when he hears you let out a little sniffle, his heart breaks at the sound. his heart breaks even more when you squeeze your eyes shut, gripping at the front of his shirt.

"baby," he pleads softly, pressing soft kisses to your forehead, mouth and cheeks when you whine. "tell me what's bothering you, yeah ?"

"m'just—you're gonna be fighting tomorrow, and we all are and i know you're strong but you'll be in the front lines against him" you blubbered, you hiccup as tears roll down your cheeks " and i know you're strong. but katsu, i can't—" you gasp. he shushes you softly, pressing kiss after kiss to your lips. he knows what you're gonna say, he knows you're worried. he's known you for so long after all.

he hated himself the day he woke up after the first war. when he woke up to you crying at his side, with you yourself still being injured. he hates how much he worried you that day and he knows that the fleeting glances you give him whenever you have a briefing with the pro's, the way you stare off at nothing whenever you catch a glimpse of his scars, are all out of worry for him. he did the same after he had found out you had also been heavily injured during the brawl, so he can't say he wouldn't do the same way.

"baby, babe—look at me" he intones softly, grabbing onto your tear stained cheeks to get you to look at him, he's close so he's sure you can see him despite the darkness. he can't help pressing another kiss to your lips " nothing's gonna happen, okay ?" he reassures, rubbing your cheek softly.

"i can't see you like that again, katsuki. i just can't" you whimper, leaning into his hand.

"you won't, promise you won't." he vows. he knows you're even more worried because you'll both be in different areas and he hates he won't be able to keep his eye on you. but you're strong and cool and everything else, so he trusts you'll be okay "i need you to trust me"

"i do" you sniffle, taking a deep breath "i do trust you, but i just—don't wanna see you get hurt, kacchan"

he sighs softly, staring at you lovingly as he pulls you towards his chest. you nuzzle against him and he presses his mouth to the side of your head. "i can't promise i won't be gettin' hurt, s'gonna happen on the job" he says carefully, rubbing your back "but i promise i'll always come back to you. no matter how fucked up i get, i'll win. for you." he declares, feeling you shove your head deeper against his shoulder.

you remember how despite getting extremely injured by shigaraki, he recovered in record time. it seemed nothing could stop your boyfriend from proving to the world he was the best. because katsuki fights and keeps fighting even if you think the odds are low, because he doesn't. because to him, there's absolutely no doubt in his mind he'll win.

and despite the worry and the fear gnawing at you, you can't help but think your katsuki is so fucking cool.

so you nod against his shoulder and he feels the collar of his shirt grow wet, but he doesn't mind as your grip on him loosens lightly until you can feel yourself falling asleep.

before you fall though, you hear katsuki speak.

"besides, i promised you i'd marry you didn't i ?"

he feels you smile into his neck, and you give him your response by happily nodding into his shoulder with a hum.

in his final moments, katsuki thinks of you.

he thinks of the promises he's made. he thinks of the promise he made to his old hag to not cause you, such a sweet girl, too much trouble. he remembers the promise he made to his old man to stay safe while he went out on patrol and when he'd fight against shigaraki for the second time. he remembers the promise he made to himself to get his limited edition all might card signed one day. and he remembers the promise he'd made when he said he'd always, always come back to you.

and he remembers the promise he'd made to marry you. the promise that you both would be together and none of the other losers would look at you.

so when he awakens, katsuki doesn't bother to ask why or how.

he simply fights and keeps fighting, so he can win, no matter how fucked up he gets.

and always, always come back to you.

3K notes · View notes

hauntingofhouses · 9 months

Text

We all already know Mizu and Akemi are narrative foils. But you know what? Lemme just say it, here's what I think:

Taigen and Mikio are foils.

Not necessarily to each other as individuals in the way that Mizu and Akemi juxtapose each other, but mostly in the contrast between their relationships with Mizu.

I've covered specific parallels between Taigen and Mikio in other posts I wrote; but as the number of parallels I'm noticing between them keeps piling up, I'm compelled to just compile them all in one post. So! This is, thus, the post in question.

First of all, let's look at their similarities.

1. Their status in society is the same. They are both samurai who lost their honour and have dreams of reclaiming it.

2. They are also both diligent as they strive to achieve this goal, they both care deeply about their work, but here as they begin to contrast, as the work in question and way they go about their goals is different:

For Mikio, his work is in taming and rearing horses; in order to prove himself, he must tame Kai—a willful and strong horse—and present it to his lord. For Taigen, his work is in sword fighting and martial arts; in order to prove himself, he must kill Mizu—a willful and strong swordsman—and present her dead body to his lord.

In the parallel above, not only are Taigen and Mikio contrasting each other, but Mizu and Kai are placed in comparison as well. And of course, Kai is Mizu's horse, and represents her. Which is why, when later, Mikio sells Kai off, it represents the way he is tossing Mizu (and their relationship) aside.

From there, the rest of the details of their character begin to contrast and juxtapose each other more clearly. So let's look at those differences, shall we?

Their backstory:

Mikio was a great samurai who was banished. A somebody to a nobody. Taigen was a fisherman’s son who rose to the top. A nobody to a somebody.

2. The first time we meet them on-screen:

Mikio is an adult. An older man. Mizu's superior in age. He is Mizu's to-be husband. A love interest. Taigen is a child. A young boy. Mizu's peer in age. He is Mizu's bully. An antagonist.

3. Their maturity and growth:

Mikio is mature, but stuck in his ways. Taigen is immature, but capable of changing and learning.

4. Their overall attitude:

Mikio is generally relaxed, easy-going and unfussy. Taigen is uptight, irritable and severe.

5. How they talk to and conduct themselves around Mizu:

Mikio is aloof, soft-spoken, and serious. Taigen is obnoxious, brash, and sarcastic. Mikio is quiet, speaking only when spoken to, even when Mizu turns to smile at him and shows openness to be near him. Taigen is loud, talking while others are silent, even when Mizu turns from him and shows no interest in conversing with him.

Mikio doesn't show much of who he is to Mizu throughout their marriage, despite their growing affection. Taigen openly shares his traumas and life story to Mizu during their brief alliance, despite their mutual antagonism.

6. Their external vs internal selves:

Mikio is calm, gentle, and considerate on the outside. Taigen is hot-headed, rude, and selfish on the outside. Mikio is cowardly and deceitful on the inside. Taigen is brave and loyal to a fault on the inside. Mikio tells Mizu that he wants to know and see all of her. But he scorns and betrays her, the woman he loves. Taigen tells Mizu that he wants to duel and kill him. But he endures torture to not betray him, the man he hates.

9. Their hair, a symbol of their honour:

Mikio's topknot is untied by Mizu during their spar. This humiliation occurs in private, the two of them alone in a rural location where no one can see them. Taigen's topknot is cut off by Mizu during their duel. This humiliation occurs in public, the two of them being watched by many others in the Shindo Dojo.

10. Their power dynamic with Mizu:

Mikio believes he is Mizu's mentor. He teaches her to throw knives, how to ride and care for horses, and about the tactical benefits of using a naginata. Taigen believes he is Mizu's equal. He views Mizu as a samurai like himself who received all the same teachings he did, and who possesses the same values.

11. Their perceptions of Mizu:

Mikio sees Mizu's feminine side first. He sees her as sweet and gentle, but also clumsy and incompetent. Taigen sees Mizu's masculine side first. He sees her as terrifying and deadly, but also strong and skilled.

12. The way they approach sparring with Mizu:

Mikio only spars with Mizu once. As the fight progresses and she is beating him, he tries to put a stop to it. When she teases/provokes him, he starts taking the fight personally and seriously, finding no enjoyment in it. Taigen spars and brawls with Mizu all the time. No matter how many times Mizu beats him, he doesn't back down. When Mizu challenges him with a chopstick, he is eager to compete with her and gladly rises up to the challenge.

Mikio and Mizu's one and only spar is a friendly match; Mizu is smiling and having fun while he grows increasingly frustrated. Taigen and Mizu's last-seen spar is a playful wrestling match; both him and Mizu are having fun and laughing.

Mikio cannot deal with Mizu being better than him, so he scorns her and walks off, avoiding her thereafter. When Taigen cannot deal with Mizu being better than him, he follows her to observe her moves and continues training in hopes to eventually beat her. After being bested by Mizu once, Mikio leaves her and sells the horse he'd previously gifted to her. After many times losing to Mizu and fighting alongside her, Taigen commends her and admits she is better than him.

13. When Mizu pins them down in a friendly spar:

Mikio sees Mizu's whole face objectively. Taigen stares at Mizu's mouth and eyes.

Mikio gets angry when she kisses him, throwing her off of him and snapping at her, calling her a monster. Taigen gets aroused, apologising, so she pulls herself off of him.

14. Mizu's blue meteorite sword is a reflection of her soul. She believes most are undeserving to face it, let alone hold it. And on that note:

Mikio is the first person (chronologically) that Mizu fights against using her sword. Taigen is the first person (we see on-screen) that Mizu fights against with her sword. Mikio is the first person (chronologically) to ever hold her sword, as she passes it to him, letting him wield it. Taigen is the first person (we see on-screen) to ever hold her sword, as she passes out, and he picks it up and carries it for her.

15. Then, last but not least, in Fowler's fortress, when she is drugged and in pain, she hears Ringo's voice in the dungeon. She then follows it to an open cell:

Mizu first sees Mikio as a hallucination, the sight of him haunting her and causing her to lose her grip on reality. Her eyes glow a surreal blue to represent this. Her Mama appears then and says Mizu's name accusingly.

Mizu then sees Taigen, but he is real, the sight of him a relief and grounding her back to reality. Her eyes return to their normal blue colour to represent this. Taigen looks at Mizu weakly and says her name softly.

Then, later, when facing Fowler, her revenge awaiting her, she instead chooses to follow her conscience (represented by Ringo's voice in her mind), putting aside her vengeance for a time, in order to save Taigen.

So that's basically all the ones I've noticed so far, but even then, I feel there's already so much that forms a contrast between these two.

What makes it especially incredible about these juxtapositions is that Mikio was Mizu's husband, the man she had fallen in love with, the one person she had ever been intimate with, the man who made her begin to accept herself, to put down her desire for vengeance and instead live a life of peace and happiness.

So for Taigen to have so many parallels with him... Do you see what I'm saying here!

Not to mention that Mizu clearly already has some burgeoning attraction to him, as indicated by how she thinks of him when asked about her desires. And Taigen clearly has shown interest as well (see: him getting a boner after their spar, him holding her hand and telling her, "We're not done yet.").

And on the topic of speculating future possibilities of this relationship, this post by @stromblessed has pointed out yet another parallel between Taigen and Mikio:

Mizu promises Taigen to meet him for their duel in autumn. Mizu fell in love with Mikio and duelled him during autumn.

With all that said, I do believe Mizu and Taigen's relationship is definitely hurtling towards something. But whether they will actually end up together in a sustainable relationship and have a happily ever after? Well, that is a whole other story; we'll just have to wait and see.