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feverish-dove · 23 days ago

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Hiihihi

I just wanted to say I really liked the way you wrote Senku!!! :3 and I was wondering if you had any more thoughts on the guy. Headcannons, or quite literally anything. Truthfully, I just wanna hear you yap about him. (Hes an Obsession 💔) Full liberty to write whatever that comes to your mind!!!

(and I completely understand if you don't. Just wanted to let you know how much I liked your thoughts on him :))

Senku Headcanons

Holy shit i'm sorry this took so long. It was not my intention to leave y'all hanging for so long. Especially for an ask when I said my inbox was open. Life's been crazy but that's no excuse. Also really weird question but I ended up making myself a Seto Kaiba (yes from Yu-gi-oh!) multipart fic as a birthday gift to me. lmk if anyone is interested in me publishing it lol. One more thing like two other people tagged me in a song trend and I swear I'll get to it too! I just don't know who to tag next haha. Senku Ishigami x Reader warnings: minor spoilers but they're not really important word count: 2,064 not cross posted on any other platform

Pre-Petrification

Y’all probably started out as classmates who argued about your specific hyperfixation interest lmao.

He noticed you because you challenged him—not emotionally, but intellectually. Most people couldn’t keep up, but you corrected him and were right. (You were NOT playing. It was more than likely something stupid like FNAF.)

He totally pretended he wasn’t interested at first. Played it cool, but Taiju saw the way Senku looked at you when you talked about your interests.

Homeboy wants to learn everything about everything. Hence his sudden bugging about your knowledge on a topic he isn’t fully educated on.

You both stayed after school often—him for his experiments, you for your own interests. Eventually, you started hanging out by accident more often than not.

He offered you coffee from a vending machine one day and casually said, “It’s statistically proven that shared caffeine intake boosts cognitive synergy.” You think that was his weird way of flirting.

The first time you called him out for overworking, he smirked and said, “Tch. Worrying about me already?” You replied, “Obviously.”

He confessed in a weirdly clinical way: “I’ve run the numbers. Being with you would significantly enhance my quality of life. Wanna test that theory together?” (Listen I know this sounds lame but go rewatch the first episode I promise you he talked like this T^T second hand embarrassment rewatch.)

You said yes in the most nonchalant way possible. By jumping up and down.

Taiju had no idea this was coming.

Yuzuriha knew this was coming.

He wasn’t very physically affectionate at first—he’d tap your hand when passing notes or adjust your collar like it was nothing, but it meant everything.

You helped him with a big experiment once, and he added your name to the credits. You argued that Taiju did way more work, so he should get the credit! Taiju just laughed you off.

Senku just wanted your name written next to his permanently. He published the document so you’ll be metaphorically stuck with him forever since nothing truly gets erased once it’s on the internet. Unless of course humanity was going to turn into stone but what's the likelihood of that?

Your first kiss wasn’t planned. You were mid-argument about the stupidest possible thing you could think of, and he just leaned in and kissed you to shut you up. “There. Now can we get back to the part where I’m right?” This just caused the fight to escalate because him, ‘right?’ Who does he think he is? You were totally winning!

He starts explaining things differently to you—not because he thinks you don’t get it, but because he enjoys seeing your reactions.

This is also how y’all became known as that couple who is always on facetime instead of just calling one another. (I get it, I too watch those gacha reaction videos at my grown age.)

When the petrification hit, he was thinking about you. Not in a romantic way like Taiju did with Yuzuriha, but instead in a, “it’s been about 1,245 years so far so they should be at ‘x’ coordinates because they were at ‘y’ when the beam hit.” “Clothing needs to take higher priority than initial calculations. They might not be comfortable being naked in the wild, extreme scenario or not.” Etc.

Stone World

Senku doesn’t realize he likes you right away. He’s hyper focused on survival, but you keep showing up to help—always curious, always sharp.

You challenge his ideas, not to be rude, but to push him further. That’s what gets his attention.

One day you show up with materials he didn’t ask for but desperately needed. He stares at you and says, “…You’re terrifyingly efficient. I like that.”

When you’re injured, he freaks out silently. He’s cold and efficient treating the wound, but he doesn’t sleep that night.

He builds you your own workstation so you can tinker with him. No one else gets one. Chrome whines because yuo don’t even use it half the time!

Gen teases him constantly. “Senku, your little lab assistant’s got you all flustered—should I schedule the wedding, or…?”

He confesses in the least romantic way possible: “I don’t believe in fate, but statistically, I’d rather build civilization with you than without you.” You had no idea it was a confession until he later refers to you as his girlfriend. It’s as much of a shock to you as it is the rest of the villagers.

You tried to kiss his cheek for sharing the cotton candy with Homura. Instead you ended up kissing his lips by accident. Your first kiss tastes like mineral water and burnt sugar from failed wire experiments.

Senku tries to pretend nothing changed after you get together, but he starts letting you touch his stuff. That’s a big deal. The village only has so much material to come by, after all.

You once called him “handsome” absentmindedly. He froze mid-step, dropped his charcoal pencil, and never brought it up again. But he remembers.

You’re the only one allowed to sit on his lap while he sketches blueprints. Sometimes he forgets you’re there until you shuffle. (Note: this does not work when he gets the invention idea at first. He gets too excited and wiggles too much. It’s only for refinement.)

Speaking of notes, congratulations, your new status as being around Senku 24/7 means you’re the official Note Taker of the new world! Title Pending.

“bUt FeVeR, dOn’T tHeY aLrEaDy HaVe A rEpOrTeR?” Shut up, I said what I said. You’re more recording data and experiments to make the first books and logs rather than make a record of history. Your beloved boyfriend is the one who gave you this task because he hates you. Jk. It’s because he doesn’t have enough hands to write everything down and conduct experiments at the same time so you have to do it for him.

Speaking of which, Senku is a certified yapper. Don’t let his nonchalant persona trick you, he’s anything but chill. If you also go off on tangents Gen is probably the one forced to break you both out of your excitement… again. (Listen they tried Chrome but he just joined in and Kohaku will not hesitate to beat both your asses so Gen it is. Poor guy lol.)

He’s not big on traditional affection, is what a liar will tell you. If anything you’re the one less prone to PDA. Now I say this but it comes with terms and conditions. Senku’s a busy guy, he likes to use his mouth–hold up–for giving instructions. So kisses are more rare. He also needs his hands for crafting, writing, just about anything really. So while he does like hand holding it’s a bit harder to get to. Which leaves y’all mostly just leaning against each other to show affection.

He does cuddle though. If it’s hot he’ll complain but that’s just because he likes to run his smart-ass mouth.

The villagers think you’re married already because you’re always beside him. And caveman laws. Senku won’t correct them.

Bonus: one day, he casually hands you something shiny and says, “This alloy’s rare. Only made it for one person.” That’s how you get your engagement ring—made from meteorite metal.

General

He’s incredibly observant, even when he seems distracted. If you so much as wince from a splinter, he’s already pulling out tweezers and homemade antiseptic.

Pet names are rare, but he sometimes calls you “Einstein,” “my lab partner,” or “miracle cure,” depending on his mood and what you’ve helped him with.

He won’t say “I love you” often, but he builds entire systems and tools just to make your life easier. That’s his way of saying it.

He builds you a custom gadget that only you can use. It’s completely unnecessary in the most loving way possible. Might even make it so on purpose just so you think of him, even if it is because of annoyance. Little shit.

Senku teaches you science constantly, even when you’re just trying to nap. He says knowledge is the ultimate gift. You say he is. He says you’re trying to distract him. You were.

When he works too hard and skips meals, you force-feed him ramen. He grumbles, but later admits you’re the only one who can make him willingly slow down.

You’re the only one allowed to mess with his hair. He pretends to complain but leans into your touch when you pull it back or wash it. Lives for your head scratches. Me too girl, me too.

He keeps small souvenirs of you in his lab coat—notes, dried flowers, a tiny bead you once gave him—and says it’s “just sentimental chemical bonding.”

Cuddles aren’t rare, but when he crashes from exhaustion, he clings like a koala and refuses to let go until morning.

He blushes like mad if you kiss him in public, but not because he’s shy—it’s because his brain short-circuits with affection.

If you get sick, he goes overboard researching herbal and chemical remedies, refuses to sleep until you’re better. Gets sick afterwards.

He gets quietly jealous when others impress you—then doubles down on his own projects to one-up them.

He lets you be the first to see every new invention, no matter how trivial. Your reaction matters more than the scientific community’s.

He absolutely remembers every important date (your birthday, anniversary, the first time you kissed). He’ll never make a big show of it, is the first lie he ever tells you.

If you’re sad, he gives you rocks that glow in the dark, handmade magnets, or funny contraptions to make you smile. Shiny rock theory anyone?

You once joked you wanted a robot. He built you one. It only says one phrase: “Senku says drink water.” Because he’s a petty asshole and you wouldn’t have passed out on the track field if you just listened to him! (Really trying to think of a Mecha Senku joke but I can’t. All I got is clang, bang, bang.)

He respects your boundaries like a contractual agreement. If you say “no,” he steps back 10 paces and documents your preferences for future reference.

You’re the only one allowed to tease him without being hit with a snarky comeback. He just smirks and says, “Tch. Fine. You win this one.”

Any inventions that might mildly convenience your life he will 100% make extra just for you. Like when he made a hair conditioner. (Shameless plug here, y’all should read my ‘Sun Kissed Science’ because it’s about him inventing sunscreen for you.)

If you cry, he freezes up, then offers you logical comfort “It’s a temporary emotional spike, we’ll regulate the cortisol levels.” Yes he does get better about this if it’s after petrification.

He teaches you math with rocks and sticks, and you somehow end up loving it because he makes it sound like magic. (That one Tumblr post that’s like “I told him to teach me about physics the same way he talks about poetry.” Or something idk I can’t remember.)

If anyone flirts with you, Senku swoops in with cold facts that thoroughly humiliate them. “You do know flirting with someone in a committed relationship is statistically foolish, right?”

When he’s working late, he lets you fall asleep in his lab, covering you with his jacket without waking you.

He grins like a devil when you match his sarcasm. He’s met his chaos equal and loves it.

He has a specific notebook labeled with your name. It contains sketches, formulas inspired by you, and a list of projects to make your life easier. It’s made of leather and crappy paper and love.

Gen called you “Senku’s moon” because he claims you’re the one constant that keeps his tides in check. He only said this to Senku but you’ll never know since he’s too embarrassed. He has absolutely threatened Genw ith manual labor if he spills.

You once called him “hot” during an argument, and he nearly walked into a tree. He denies it, but Kohaku saw.

When the two of you argue, it turns into a debate show. People bring snacks. You both win.

He secretly carved your initials into a spot behind the observatory, visible only when the sun sets just right.

He doesn’t believe in fate, but when you touch him, he swears his neurons fire in patterns he can’t explain—and that’s saying something.

@mylostleftfootsock im so sorry for the wait!

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