Astra And Sun, Surrounded By A Sea Of Children, Moving Backwards In The Same Rhythm And Didn't Notice

Kimetsu Academy AU, where there's a squeaking coming from the fan ceiling in the chemistry lab and everyone be like "???" "What's that noise?? Is it going to fall??" So Obanai shutting the fan cause it's noisy and disturbing the class.

Then something comes plumping from the fan -- squeaking -- everyone screams and panicking as realisation sinks in at seeing that it's a mice.

Kaburamaru lungs, catches the mice in his mouth and everyone screams louder.

Que Uzui sprinting into the class, shouting and yanking his buff mice from the snake's mouth but unintentionally pulling too hard and flung both Kaburamaru and buff mice from the second floor.

Chachamaru playing with Gyomei outside and sees a snake and a mice in the air -- pounds forward and catches both with his mouth before dashing away into the hallway, catching students and staff off guard.

Gyomei startles, Uzui and Obanai screaming from the second floor.

Chaos. Chaos everywhere.

(it ends with Tamayo bringing back Kaburamaru and buff mice since Chachamaru brought them to her office)

Here's a fun scenario!!!

Basically, maybe in the beginning of season 1 or around Part 2, Nomura accidentally finds a relic that may have belonged to a demon, their demon art being able to control time. She keeps it in the museum for storage to be taken to the Janus Order for study.

Only for A. In events of "Waka Chaka" the relic is broken or activated and the demon uses it to escape to present Arcadia. Or B. After "A Battle of Two Bridges" a museum work mistakes the relic as a display piece and puts it up, leading to the same scenario.

But not just the demon is taken to Arcadia but also the Demon Slayers the had been chasing it, being Tanjiro, Nezuko, Zenitsu, and Inosuke.

The group is not only stuck in the modern era, but we're the land and language is so new and unfamiliar. Even more confusing is the boy in shining armor seemingly protecting some stone "demons".

(finally managed to answer an ask idk what's going on with my blog)

(update: I can answer this one only for now huhhhh anyway)

That's a fun scenario to think of! I also weighted the option of time traveling but didn't think to put a demonic relic 🤔 I once thought of having Yushiro being involved in the Trollhunters stuff starting off with his drawn portrait of Tamayo being hung in the museum (because it's one of his oldest painting and he used very old and antique painting set)

Your idea will be fun to explore! I'd imagine this being set at the option B because wohoo the CHAOS there would be so so messy.

Like in Jim's POV, he suddenly sees four unknown people stumble out of nowhere in eastern clothing and brandishing swords he recognizes as katanas (and the girl doesn't seem human???) and in Tanjirou's POV, he and his friends get transported into another world in the middle of a fight and what what are those demons they don't smell like demons wait WAIT INOSUKE I DON'T THINK THEY'RE DEMONS DON'T KILL THEM YET --

But everyone probably focuses more on the fact that they're people to protect, so Tanjirou and his gang try assisting Jim and the others despite the absolute confusion and language barrier.

The way Bular and the changelings and the goblins suddenly get overpower only by the appearance of four teenagers is bewildering like these kids aren't like Jim and Toby -- they CAN and WILL take lives. This makes Jim and Toby flabbergasted too as they watch the slayers actually don't hesitate in chopping limbs and aiming for the necks.

Surprise surprise Draal manages to have a quick but informative conversation with the slayers in the middle of the fight like he suddenly speaks fluently in Japanese (Nomura let out some Japanese curses as well) and it's a huge help to the others so they can have better coordination in fighting against Bular.

Once the bridge is down and the changelings are gone off sights, Jim and Toby have to stand as a shield of sorts between their troll friends and the slayers because suddenly the katanas are all pointed towards them.

" They don't smell like a demon. " Tanjirou says. " But they are vulnerable to the sunlight as well. "

" Drop your swords! They're not dangerous! " Jim can't help but to snarl. He's exhausted. Draal just has his right arm turned into stone and the others are not left unscathed from the battle.

These new incomers are powerful -- probably the strongest humans Jim has ever seen. They are warriors, he can tell. They have experiences. He's forever thankful that these slayers are on the good side at least.

" Do you eat humans? " The question is directed to the blue troll.

" No. " Draal answers in Japanese, his breath is heavy and tired.

The slayers exchange glances. Zenitsu can tell that there's nothing but truth in their claims. Nezuko doesn't seem alarmed as well. Inosuke decides to let his comrades lead the situation next. Then, they drop down their arms to their sides.

" So, " Toby looks around at the mess, " what now? "

This can probably be a very long one shot or some chapters. I imagine the slayers have to stay in the trollmarket (with Nezuko and all) because staying together is a better option. They'd try to explain what they work as and get accustomed to the modern world.

Inosuke absolutely loves the training ground, cackling as he dodges the swinging blades and leaping over moving tiles. Everyone gets another whiplash at seeing his beautiful face. Zenitsu jumps at every second a troll walks past him but he feels safer around Aaarrrgghh (cause he thought the gentle giant could shield him from danger).

Nezuko spends most of her time sleeping. She surprises some trolls with her strength. They compare her to gnomes, and this sparks out some angry rambling from Tanjirou who keeps claiming that she's a beau.

Tanjirou offers to help Jim in terms of stamina and muscle management with total concentration breathing. Their swordsmanship is different so there's that. Blinky thinks it'd be good to have Jim battling against an opponent with different style fighting and Tanjirou is yet to be defeated. He encouraged Jim and is very humble so he gets along with everyone.

This is all I can think of for now, but this is a joy and interesting idea to think of.

Based on recent poll

" She talks to me often. "

[ Demon Slayer × Trollhunters ideas ] (4)

Inspired by an idea of Trollhunters characters being in the Demon Slayers world instead by @coolestzed 👀✨

TW: Gore talking

" Trolls..." Enmu taps his chin in a mocking thoughtful gesture. " Ah, yes, I've heard of them...Master sometimes would allow the leftovers to be given for the Uppermoons..."

Jim tightens his grip on Daylight, squinting his eyes as he tries to focus through the harsh wind and the rattling of the train he's on top off.

" What do you mean by leftovers? "

" I don't know much, but Master has mentioned trolls a few times...apparently they cannot handle sunlight as well, have long lifespan, and some possess powers like Blood Demon Art..."

The Lower demon giggles, clasping his hand over his mouth. Jim's glare hardens.

" But oh, we demons are much more superior to them! Master Muzan took a few so he could study them closer...when they couldn't take it anymore, he handed the leftovers to the other demons...apparently trolls are edible eheheheh!! "

" You -- " Shudders run down Jim's spine. " -- You eat trolls..? "

Enmu finds delight in the horror of the boy's face.

" What did you say you were? The Trollhunter? Why the long face if you hunt trolls? " The demon wringgles his fingers, making a motion like opening something. " I was fortunate enough to hear of the experience of eating trolls...the skin is very hard and thick, so they have to pry it open and then scoop up the organs -- "

Daylight slashes down on where Enmu used to be, the demon hovers in the air for a few seconds before landing on another spot. He can't hold back the laugh from seeing how Jim looks at him.

" Oh? Are you angry? "

" You're sick. " Jim feels like wanting to vomit. He's no troll himself, but to be treated and talked about like you worth nothing makes his blood boil.

He doesn't dare to imagine if Blinky, Aaarrrgh or Draal were taken away by the demons as meal courses. He'd fight nails and teeth to get them back.

" The trolls have something like crystal stone in them I heard? " Enmu continues on dismissively. " It supposedly can be energy boosting..."

The demon licks his lips. The mouth on his hand copies the movement. Gritting his teeth, Jim fixes his stance and charges, his chest expanding through the total concentration breathing he was taught and practiced. Enmu raises his hand lazily.

" Sleep. "

Thinking about KNY x Trollhunters crossover and the comedically misunderstanding it can ensure;

" Oh! You know about them? (Talking about trolls) "

" If we're talking about creatures that perish under the sun, then yeah. (Talking about demons) "

" Huh, you're taking this fairly well about them. (Trolls) "

" Yeah, my ancestors have been fighting them so the stories get passed. (Demons) "

" Your ancestors fought the bad ones? Wow, they must've been warriors! (Gumm Gumm trolls) "

" They prefer the term slayers, and yes, the stories highlight that they are good ones. (Nezuko, Tamayo & Yushiro) "

" Huh, it would be nice if we could use some advice on how to defeat the bad ones. (Gumm Gumm trolls) "

" Why? They've perished a long time ago. (The Final Battle against Muzan) "

" They're still around? They're trying to escape from the other side you know? (Darklands) "

" What do you mean they're trying to escape from the afterlife? "

" You call the Darklands the afterlife? "

" Darklands?? "

" Yeah? Gunmar and the Gumm Gumm trolls were banished there centuries ago? "

A pause.

"...Trolls? You were talking about trolls? What are trolls??? "

Another pause.

" Wha -- of course I am talking about trolls! What did you think I was talking about?? "

" Demons?? Man eating creatures that can't be under the sun??? "

" That sounds a lot like the Gumm Gumm trolls. "

" I am literally talking about the demons -- the ones that have existed for centuries before they were defeated in the Taisho era??? "

A very, very long pause.

"... We're misunderstanding the whole thing, aren't we? "

"...It seems to be so. "

[ Demon Slayer × Trollhunters idea ] (1)

[ Kimetsu Academy & reincarnation AU ]

Tanjirou doubles over, hand clasping over his lower face. He hears the man speak, but his voice sounds almost underwater-like. Muffled, too faint to be heard. The boy can't focus on what the man says. He barely registers the fallen documents containing the information of his internship in the facility.

He's too occupied with the stench coming from the man. The pungent, foul smell that has Tanjirou gagging, his knees buckling. He feels hands on his shoulders -- reflex surges through his muscles and he slaps the contact away.

Strickler stares, eyes wide and bewildered. Tanjirou shares the same look, although his resemble more of a cornered animal. Unsure and confused.

" You don't seem so well, Kamado boy. "

Tanjirou doesn't like how the nickname rolls off the man's tongue. It's supposed to be reserved for his teachers back in Japan. Not this one.

Not to this... creature, that has the scent of blood and horror warping around him.

" Let me contact your guardian. Take the day off. Maybe the difference of time between here and your country makes you feel sick. "

Tanjirou shakes his head, straightening his back and steadies his breathing. He just gets caught off guard. He needs to maintain composure.

Regardless of what he's facing right now. Whatever Strickler is, he doesn't smell like a human.

" Please excuse me, " Tanjirou feels his hand shaking, " I need a moment."

There is a lot he's feeling right now. The familiar feeling, that he had thought to be buried deep in himself along with the memories before he reincarnated, found its way back to the surface the first time he met Strickler.

The feeling of being in an unknown danger.

I made a mistake, 2003 Donnie is a demon in disguise, he does no harm but takes no crap, thank you for correcting me

I don't remember that much from 2003 Donnie, but compared to the other version of him, he's pretty less chaotic than them.

2012 Donnie blows up his lab, 2014/2016 Donnie jumps out of a plane, 2018 Donnie is thirsty for homicide.

Buff Nezuko supremacy

Probably going to write something with this crossover, where Tanjirou and Jim are pen pals ☺️