#demon slayer in theory

[sparky-kasane]

NEZUKO CHAAAAAAAN i wrote a fic

[ask-dancing-fox]

Did anyone else notice this?

The scars are very different. In the first image the scar is considerably larger and more gnarly than in Giyuu's memory. This was the same case in the manga as well.

I believe this was an intentional choice because this is how Sabito really looked vs how GIYUU remembers Sabito. I suppose it could be said Giyuu was remembering through rose tinted glasses to an extent and it's understandable that after having repressed the memory of Sabito for so long some details would be off.

Also, In Giyuu's eyes Sabito's scar wasn't this huge, ugly thing because that didn't matter to Giyuu thus it's apperance being minimalized in his eyes. most people would be put off by that massive 'blemish' but seeing as it's been reduced to such a small detail was really touching in Giyuu's memory. Yes it's there, yes it's a part of Sabito, but Giyuu hardly notices it. All he sees is SABITO.

[demonslayerunhinged]

Unhinged theory/observation

The reason Genya didn't die was because he was holding their baby brother.

All the kids were slashed in the neck by the glass shards, which was why they died instantly

Genya almost got slashed in the neck too but it hit his baby brother instead and a bit slashed him across the face.

The baby is at the bottom center, you can see the place where he got slashed by the glass.

But I may be reaching tho

[typicalityness]

Five senses again boys i'll never stop drawing them

[peachdues]

Do you think, the first time Sanemi gets a wrinkle, he feels relieved? Do you think that he secretly looks forward to each new one that etches itself into his face, not because he’s grateful to age when no one else he loves could, but because it means his scars finally begin to disappear, too indistinguishable from the lines that the years carved into his skin? Do you think he’s happy to see the monster he’d turned himself into, fade?

Or, do you think he mourns the loss of his scars, these things he spent so much of his youth despising, and yet are his last connection not just to his mother but to Genya? The last tangible remnant of a time when, no matter how much he denounced the existence of his little brother, he still had one, and the matching scars across their cheeks was proof — proof of Genya’s existence, proof of Sanemi’s love. The loss of his scars is just another reminder that he could not save Genya from the fate he tried so desperately to spare him of. Sanemi’s scars fade into the tapestry of wrinkled, age-worn skin just as the memory of Genya and Shizu and all his friends and family fade, with no one left to mourn them but him.

@homo-homini-lupus-est-1701 your scars meta forever living rent free in my head

[crescent-blades]

What Rank did Michikatsu [Human Kokushibō] Hold as a Samurai?

When we think of a samurai, we often envision a fierce warrior prepared for battle. While this is partly true, we often tend to forget the internal heirarchy among them. Like any military group, samurai had a clear chain of command for smooth operations. However, it's important to note that samurai were a social class rather than a military one. 

These "ranks," or more so, distinctions within the samurai were closely tied to hereditary social status, the extent of land ownership, and titles within the clan, rather than personal skills, which could vary depending on the era.  

In this discussion, we will concentrate on the Sengoku era, as it is relevant to our topic. I will examine Michikatsu's role based on the available canonical information. 

⚠ SPOILERS AHEAD ⚠ | Masterlist

⨳ Where His Father stood   

In the image above, Michikatsu talks about his father having a "vassal." A lot could be inferred from this, but it is likely that his father either might be a samurai lord [Sengoku daimyo] or a wealthy, high-ranking samurai who supports smaller samurai. 

[Daimyo (大名): military lords who controlled small, unified areas in which all the land either belonged to themselves or was held in fief by their vassals] [Vassals: subordinates who pledged their loyalty and obligations towards powerful lords] 

So essentially, he was not just an ordinary samurai but rather a figure of considerable importance. His possession of vassals and land suggests that he must be exercising some form of governance, implying that he is possibly some sort of lord having an independent clan. 

As you can see, he seemed to have personal servants:   

And also personal messengers:     

Though it is rather difficult to tell whether he was a powerful lord or not—an actual daimyo who was the direct vassal of the shogun, or just a lesser lord having a smaller land—possibly a heir to the family head or a landowner with a fief.

⨳ Was The Tsugikuni Clan Powerful? 

First, let us understand what was going on during that time:  

"This was the 'Age of Warring States', when scores of minor daimyo seized power for themselves in their immediate localities and fought each other until, during the mid-16th century, a comparative handful of 'super-daimyo' competed with each other on a grand scale before Japan was finally reunified" [source]

From this, it seems logical to assume that the Tsugikuni clan was a smaller one rather than a grand one—also considering Michikatsu's father's rather obsessive nature and his intense determination on getting better heirs, even to the point of being willing to harm his own family due to superstitious beliefs. Better heirs: more likely the clan gets to thrive and gain power.

Also, if we consider these words from Kokushibou:  

Notice how he says this—he doesn't seem to be very surprised to know that his clan's name has died out, which would only solidify the fact that his clan must not be very powerful to begin with. [Considering that many direct descendants of the major clans today still seem to be thriving, with many carrying out their clan names. Muichiro seems to be an exception here]   

So now that we know that his clan was likely not a powerful one, we could also assume that his father was a local lord rather than a full on daimyo for obvious reasons. Not only that, but this would also suggest that their clan must be a retainer family—they would be under a much stronger lord—a powerful daimyo, whom they would had to serve.

⨳ MICHIKATSU'S POSIBBLE RANK [DISTINCTION]  

Before moving on, I would just like to point out that holding a high-ranking position as a samurai—such as leading troops— was a result of personal achievement rather than mere familial ties. If a family did not meet the necessary standards of talent and capability, their members would be assigned to lesser roles based on who they served.

With that being said, let us now try fitting in Michikatsu into all of this and find out what military rank he should have based on his family background:

Initailly, I was rather confused and wondered if Michikatsu could be a Hatamoto. They were the highest ranking samurai, considered the most loyal and skilled, who acted as bodyguards towards their lord. Sounds familiar, right? However, there was one piece of canon information that completely debunked this idea:

Samurai usually had to chop off their enemy’s head as proof of their kills; typically that shouldn't be done by the hatamoto, as they typically stayed close to their lords as a last resort instead of fighting on the front lines like the others. 

Okay.. so he probably isn't a hatamoto. If his first instinct was to bring the head of Ubuyashiki to Muzan, then it suggests he must have done this before. if that's the case, then he must have ranked lower than a hatamoto, more so in a class where he might have been around collecting heads. After looking into what the manga could offer, I reached two conclusions:

1. He was a Taisho (大将)[general]: These ranked officials were the generals in the Daimyo's army, leading groups of soldiers called kumi. Depending on the troops they commanded, they were either referred to as Samurai-taisho or Ashigaru-taisho. They usually oversaw multiple kumi, each consisting of around 50 to 100 men. 

2. He was a Kumigashira (組頭) [captain/platoon commander]: These officers controlled and led a single kumi of troops and were called samurai-kumigashira or ashigaru-kumigashira based on the type of troops in their kumi; which, often consisted upto 15-30 men each.

-> By those conical hats (jingasa) those men are wearing, I'm pretty sure they are depicted as Ashigaru foot soldiers. [This explains why he refers to them as his subordinates, as ashigaru were considered lower than samurai.]

Looking at the image, I doubt there are 50-100 men present there, and it seems more likely there are about 15-30. Therefore, we can conclude that he must be an Ashigaru-kumigashira.   

Also, when people talk about Ashigaru, they usually think of peasants taken out of their farms. This is a misconception. Even though they were lower in class, ashigaru were generally treated as full on warriors. Not only were they as capable as their samurai counterparts, some were even stronger than them.The men under Michikatsu's command were fully capable and skilled swordsmen.

⨳ Michikatsu's Troops and His Role:    

A general overview of the make up of the sengoku era army

—In short, the troops were reorganised in Sonae, which had between 300 to 800 men. Each Sonae included various types of troops. They were split into smaller units called Kumi, based on their weapons. These included archers, gun squads, cavalry, spear squads, and standard bearers.

By looking at these images, I see no one holding weapons, just a few casual swords thrown in here and there, which I find to be very odd.. 

Perhaps Michikatsu had set up his base further from his soldiers and gathered them up for a speech about the next day's plans just before they went to sleep? This could explain why they were caught off guard by the demon and didn’t have their weapons ready. After all, it’s strange not to have your weapons out when you are being attacked.   

Regardless of the situation, his troops should be either a spear unit [Yari-gumi (長柄組)] or an archer unit [Yumi-gumi (弓組)].

These troops Consisted of: 1 samurai commander/katana samurai, 2-4 servants, ~20-30 foot soldiers, 3 labourers, 1 cavalry horse, and 2 packhorses.

Why you ask? This is because, firstly; guns weren't introduced until the mid sengoku period in 1543 [Michikatsu is theorised to be born around 1432] In the cavalry unit, the troops consisted of samurai rather than ashigaru, and bannermen did not engage in battle. 

MICHIKATSU'S ROLE: Although there is not much provided anywhere about these commanders, from everything I have gathered: These commanding officers used to lead a unit of ashigaru soldiers. They were ranked below the sodaisho and samurai daisho (commanders) and an ashigaru taisho.

He would be assigned to train them, discipline the foot soldiers, and turn uneducated common men into reliable warriors. He would command and lead them, ensuring everyone followed his commands and maintained order within the ranks, and not disrupt the hierarchy. Hmm that sounds familiar doesn't it?

[I might actually make a detailed post about the military formation with Michikatsu if any of you are interested.]   

Final thoughts: 

[A/n: Hello everyone! It's been a while since my last post. No, I haven't abandoned my blogs. I just took a short break last week. Now I'm back and eager to share a theory with you all! Which I will be posting more of, both here and on my other blog, @gilded-sunrays. Please feel free to share your insights!]  

And if you've made it through all of this, then I thank you wholeheartedly!

[ratwithhands]

Read right to left (Manga Formant) I actually have a lot more sketches of Kokushibo but this is only one that works without any context. I'll try to post more of him soon but I've somehow stuck myself into writing like 4 different AUs at the same time so it's gonna be slow 👁👁💦

Also bonus doodle from today:

[laddess-865]

Sorta figured out Shinjuro Rengoku's height. We know that Tengen is 6'6 and in this panel, Shinjuro is only a few inches shorter. I'd say he's prolly about 6'0-'3ish.

I also think he's prolly around 43-45. In the Meiji period (just before the taisho period), men usually got married in ages ranging from 18-30 (but mostly commonly got married around 25-30). In the picture of him with a pregnant Ruka, he appears to be in his early twenties (I'd say about 23). When Senjuro is born, Shinjuro appears to be in his late twenties. So that must mean that Shinjuro probably got married young for the time to continue the Rengoku family quickly. That also suggests that Shinjuro probably has no other siblings to help continue the line.

Idk, I'm just spitballing at this point, but basically, Shinjuro is most likely in his early 40s and 6'2ish

[everlastingleuthymia]

KNY Theory time!!

Have you ever noticed ? In each taishou rumor in the anime , they're in the stage with red curtains .

What if everything was just a school play ? Or a theatre play ? What if the manga was just the script and everyone in the show are only actors?

What if the gakuen was what their life is really like ? WHAT IF?

What if everything was just a play everyone was paid to?

Sorry I'm doing this to cope after reading the manga

Note ; This theory is not proven and is just a guess .

[gilded-sunrays]

How fast is Yoriichi Tsugikuni? || Calculating his minimum speed

Yoriichi Tsugikuni is regarded as the most powerful character in Demon Slayer, with him being able to rival and overpower the demon king himself, Muzan Kibutsuji. He is renowned for his exceptional speed and agility; however, the true extent of his speed remains uncertain due to the lack of comparable benchmarks. 

Therefore, today I will make an effort to clarify some of the confusion by applying some of my knowledge to estimate the average speed of this character. From here, you are free to interpret and use this information as you see fit. 

NOTE: SIGNIFICANT FIGURES UPTO 3 DIGITS AFTER THE DECIMAL POINT 

⚠ SPOILER WARNING ⚠

⨳ Muzan's Explosion: Detonation or Deflagration?

To begin, let us examine this image. If we want to determine Yoriichi's speed, then we obviously have to know the relative speed of some other body that we can compare it with. In this case, we will consider Muzan's explosion. [Not using NLM or COLM as it doesn't consider the huge amount of force being exerted]

In an explosion, an internal impulse (force per unit time) acts in order to propel the parts of a given mass into many fragments in different directions. After the explosion, the individual parts of the system have momentum. Obviously, if a body has momentum, it would mean it has a velocity as well, as momentum (p) ∝ v. 

Explosions can be further classified into detonations and delafegations:

[Defragrations: Energy released is in the form of heat like in a flash fire. It requires fuel an external oxidizing agent, rely on the external pressure and are considerably more stable.] [Detonations: Energy is released in the form of high pressure (force). Does not require a fuel and doesn't depend on the external pressure, and involves chemicaly unstable molecules, which instantaneously split that recombine into different products.]

[Defragrations VS Detonations] You can refer to this link for more information. However, to keep this post concise, I will outline a straightforward distinction between the two

⇒ Muzan's explosion is more likely that of a Detonation, rather than a deflagration.

⨳ Muzan's Detonating Speed:

Detonation velocity depends on a number of factors, such as density, it's state, charge diameter and temperature. For solids and liquids, these velocities usually range from 4000 m/s-10300 m/s. Muzan's density is likely similar to that of a human, around 1000 kg/m³ or 1g/cm³. .. Let's compare this density to that of regular explosives:

link here

Although, we can see the closest explosives to Muzan's density are 1.___ ones. However, we can also see even then these velocities aren't propotional to their ascending order of densities, but it does give us some insight.

Though, we cannot determine his charge diameter and temperature [although his flesh appears very red]. Plus, there also seems to be one compound in the given table [ansu] which only has a detonation velocity of a mere 3400m/s. So.. it is very difficult to make assumptions here. So to remain neutral, we will just use the lowest speed value, ie 4000 m/s.

⇒ Hence, we can safely conclude, that muzan likely detonates with the minimum speed of 4000m/s.

⨳ Yoriichi's Attack Range and the Time Needed For Him to Cut All the Peices of Muzan

To evaluate Yoriichi's speed, we will first calculate the total time it would take for him to react and effectively cut all of Muzan's pieces [excluding the 300 pieces, which we will discuss later] before he has the chance to escape.  

So for that, first, we need to determine Yoriichi's attack range by measuring his arm length. Instead of making an estimation using measurements of an average male arm, I decided to accurately measure this out myself:

We know Yoriichi is approximately 6.3 feet tall, which is about 2.6 times the length of his arms. Based on this, we can conclude his arm to be around 73.07 cm. (190/2.6) + sword length (we'll take the average of 65 cm)   

ie = 1.381 m So, the maximum time needed for him to cut down muzan would be: ∴ 1.381 ÷ 4000

⇒ ~0.000345 seconds

⨳ Distance Covered By Yoriichi:

 [I think if you know a bit about physics, you might see where I'm headed.] We know that speed = distance/time. We have already determined the time, and now we need to find the distance to calculate the speed. How can we do that? We can begin by figuring out the total distance Yoriichi's arms cover while swinging the sword:

 To do this, let's refer to the image above. If we examine it closely, we can see that Yoriichi creates arcs with his sword, forming almost a complete circle

Please excuse my silly drawing, but this is my idea of the sword arc. I imagine it as two-thirds of a circle instead of a semi-circle.     

To find the arc length, we will use 2πr × 2/3 Radius: Yoriichi's arms and sword  ∴ 2 × 22/7 × 1.381 × 2/3

= 5.786 m is the length of each slash

⨳ How Many Slashes Did Yoriichi Make?

To finalise, we will check how many slashes he made to cut muzan. Clearly, he wasn't making just one slash for each cut, as that would be very impractical. So, let's see how much work he is doing here: 

Once again, in the image above, we can see that he cuts multiple pieces of Muzan with each slash. On average, let's say he cuts about 2.5 pieces per slash. The picture shows him cutting 4 pieces with one slash and only 1 with another, with one piece just hovering, so the average:

(4 + 1) ÷ 2 = 2.5.  

Now, he also mentions that he cut around 1500 pieces of Muzan, so we can divide to find the total number of slashes he made. That is:

1500 ÷ 2.5

⇒ ie; He made 600 slashes during that time. 

⨳ Yoriichi's Average Striking Speed

Finally, for the moment we all have been waiting for. The speed by which Yoriichi is moving his arms would be: 

n(number of slashes)×distance covered by Yoriichi/max. time frame  = (600×5.786)/0.000345

~10,062,608.696 m/s

For Comparison: this is about 29,337 times faster than sound. ▪︎Have you guys ever played fruit ninja before? If you have, just picture Yoriichi taking on that game in real life; Number of slashes/frequency [1/T]= striking speed/ distance covered (gonna take 1/3 of the circumference of his slashes) Ie n= 10,062,608.696 ÷ (1/3 × 2 × 3.141 × 5.786) ∴ Slashes per second= ~ 831,361 So, if you were to toss about 8 hundred and 31 thousand fruits into the air, Yoriichi would be able to slice through them all in just one second! Meanwhile, I’m here taking like two entire minutes to chop an apple.

⨳ Yoriichi's Average Running Speed

So we have found out Yoriichi's striking speed; however, that doesn't tell us anything about how fast he can run. Since we're already looking into Yoriichi's speed, why not find out about his running speed as well? 

"In an average person, the legs are able to push roughly four times as much weight as the arms can pull. What's more, the legs have an even better advantage when it comes to endurance." 

Although there is no relationship between strength and speed, let us just try finding it ourselves.  

 Fleg-mg= ma (force exerted to lift your leg. Could have used the work formula, but then I realised that you're probably not doing any work when it's your own body. The same could be said for the force, however. Though this is an idealised situation and it really doesn't matter because:) ∴ Fleg∝a a∝v Let force required to push your arm be be f⁰ & leg be f Since f⁰ and f = 1:4 => f⁰/f=v⁰/v = v⁰/v= 1:4

This would mean the legs must also be 4 times faster than the arms.

Ie: 10,062,608.696 m/s ×4

= 40,250,434.784 m/s

For comparison: The speed of light, 299,792,458 m/s is only about 7× faster than Yoriichi's running speed. ▪︎If Yoriichi were to complete a journey around the entire Earth, traversing its full circumference, the time required for this would be: Earth's circumference: 40,075,000 meters Calculation: 40,075,000 ÷ 40,250,434.784 = 0.996 seconds [Wow.. now that's fast o-o] So imagine, if you ever find yourself missing a flight and in desperate need to get somewhere, all you have to do is call Yoriichi. He’ll have you zooming off faster than you can say “I missed my flight"!

poor muzan..

-> The distance between two countries [say, Japan to brazil] would be about 17,371 km (pretty sure it's not the road distance, so lets just just imagine Yoriichi can run on water) Time=d/s = 17371000/40,250,434.784 ...0.4 seconds to reach there.

▪︎But instead of a circumference; what about him covering the entire surface area of the earth? [not the area, but the entire outer surface, covering eacg and every path possible. Just visualize unfolding the entire earth into a flat ground.] So: 4πr² [csa/tsa] =4×3.141×6,371,000× 6,371,000 =509,805,890,960,000 m So the time: 509,805,890,960,000/40,250,434.784 12,665,848.050 seconds Which is about 3,518 hours Which is about 4 months I know now this looks kind of slow, but trust me- this is extremely fast. This pace equates to covering the entire circumference of the Earth approximately 29,348,102 times.. (29 million times)

⨳ Final Thoughts:

A/N: I tried my best to keep this entire post simple and concise as possible. For some reason though, I still feel like it might be more technical than I intended. I’m not sure this post will get much attention because of that. It doesnt matter though, I really enjoyed putting all of this together. I truly hope it proves helpful to someone out there who might find this interesting.

And to anyone who made it till here, I thank you wholeheartedly!! You’re amazing for sticking with all this. And if you think that I may have made any mistakes, then feel free to correct me!

Sources:

Leg Strength as a Limiting Factor, climbstrong Detonation velocity, wikipedia Table of explosive detonation velocities

[cartoontees]

hilarious that some of the prominent demon slayer characters with colored hair get explanations, but the vast majority don't. i mean i was all for just accepting it was anime logic but then they had to go and acknowledge it by giving crazy explanations for a very select few.

zenitsu had a normal hair color but it turned yellow and orange when he got struck by lightning. ok, sure!

mitsuri was born with a normal hair color but it turned pink and green from her eating a really massive amount of sakura mochi... alright!

rengoku also says at one point that he thinks his family has bright yellow and red hair because his ancestors ate a ton of shrimp tempura. whatever you say! that's how it worked for kanroji after all!

these two are unexplained but maybe uzui and sanemi maybe went gray/white at young ages due to the stress of their environments? neither of them had a very good childhood after all.

but then.... there's these bitches.

no explanations given. this is just how they are, i guess. pink hair is WEIRD, but peach hair is unquestioned. maybe the rest of them dye their ends. who knows. anime logic.

[kurokamiiii]

🩷💚 My two favorite characters ❤️🧡

[vale-var]

They don't find it curious like Giyuu and Tengen even though they canonically met Kanae, she is practically non-existent in her flashbacks and the rest, and if they say "she was just a co-worker", knowing Tengen who is in a certain way sociable and that she liked extravagance, or Giyuu who is so sensitive and showing it is curious that because of what was shown with Kanae that they always make her so ridiculously happy and kind, that practically non-existent, (or maybe I'm just overanalyzing it and I'm crazy, and I have an hc that solves my doubts)

[demonslayerunhinged]

Unhinged theory

This is based on @roseameilatempest's analysis that Sanemi needs a slap like the one Giyuu got from Sabito.

Who slapped Genya?

Someone had to have because the change from this

To this

Is huge! I mean, he even sits properly compared to Sanemi.

I don't think it has anything to do with puberty, either. I think someone gave Genya a life-changing slap that altered him.

And I think it's Gyomei.

Let me explain:

Think about it. Genya is a little shit, desperate to climb up the ranks quickly to meet and be acknowledged by Aniki.

He sees Gyomei and thinks 'hey this guy's the strongest Hashira so if I get trained by him, I'll become really strong too!' but because of his rough upbringing he goes up to Gyomei confronting him, asking him in a rude, impatient way to train him.

But this is Gyomei 'fuck-them-kids' Himejima. He don't have time for anyone's bullshit.

So Gyomei's like:

"Boy, you better watch your tone! Who the hell do you think you're talking to?!"

Wham!

He gives Genya a slap like the one he gave Inosuke.

Except this one is much different because it's combined with the power of a pissed-off Asian+Latino+Black mother.

A slap so powerful it reset our boy's brain back to its factory settings, got him to find Buddha, cleaned him up, pushed back his mohawk, corrected his posture, brought back his eyebrows and made him into the sweetheart he is today.

In Conclusion, thank you Gyomei for setting our baby boy straight! 🙏🏼

[micahenjoyspepsi]

I fucking did it, here he is in all his glory , I just love this demon twink so much, I might post a redesign of him if anyone is interested 😼😼😼

[fallstreakfeathers]

I know the popular thought is that Aizetsu and Co. didn't want to fuse because they're "never brought out" but I have been doing some thinking (yes it did hurt) and have a different theory:

I think I've mentioned this HC before, but Hantengu is usually split off into his 4 main clones. He absorbs them into the main body during meetings or scenarios where he wants to come off as frail/weak/pathetic or when The Boys would be too rowdy or draw too much attention. Otherwise, they're free and vibing, whatever that means at the time (Muzan uses them for recon a lot and to look for that stupid flower in particular)

When Urogi said that it had been a long time since he'd been free, he was being dramatic- he'd only been in Brain Jail since shortly before the upper moon meeting. But, a couple days in dumb baby jail can seem like an eternity when you have as much energy as he does. And frankly, he probably didn't know what day it was anyway. He is dramatic.

Moving on.

We know that Hantengu will blame everyone and everything but himself, even his hands as if they're a separate entity. He wants to have as many people to blame as possible. Anyone except his Poor Innocent Self.

Which brings me to my theory:

The Boys didn't want to form Zohakuten, not because they wanted to remain free (though they definitely wanted to preserve their individuality, imo, and they do lose it when forming Zoha until theyre manually brought out from the main body again) but because it contrasts with the way Hantengu views himself and they know that subconciously, and therefore viscerally dislike the idea. They exist to serve Hantengu and his will. If the boys are out, then Hantengu can blame the evil he does on Sekido and Karaku and Aizetsu and Urogi.

My point is that if they aren't available, then Hantengu is that much closer to having to admit his guilt, and because the clones ARE Hantengu, they instinctually don't want that.