Curate, connect, and discover
The parallels between the Thunder siblings and the Tsugikuni twins run deep. Starting with Kaigaku and Michikatsu's memories, it's evident that there is no strict rule about demons retaining their memories after transformation. I believe it mainly concerns their corruption. When demons' memories are taken away, a fundamental part of them is erased, which makes it easier for Muzan to reshape their relationships and identities to serve him. In the case of these two, remembering is essential; Muzan needs them to hold onto their worst qualities and instincts. Hatred and jealousy are powerful, binding emotions that drive both of them. Muzan's strategy is to keep them as their worst versions, which is why I believe these two kept their memories despite being transformed. this similarity is also the undeniable reason why Kokushibo was Kaigaku's path into demonhood.
As for the other two, aside from Tanjiro, I think Zenitsu is the closest to Yoriichi among the Kamaboko squad. They’re both really hard on themselves. Even though they’re clearly talented, strong, and heroic, they can’t seem to accept it. Zenitsu sees himself as a coward who doesn’t amount to much, while Yoriichi feels like a failure. But both have a lot of kindness, bravery, and care for others.
Both also fight their turned demon siblings, and the saddest part is that they both "die" when they "kill" their brothers. Yoriichi's heart stops at that moment, and Zenitsu falls to his death without trying to stop himself, and almost crosses to the other side. It's as if the act itself was so painful. They understood they had to end their siblings' lives, but despite any anger, disappointment, or pity they felt, there was no triumph in their actions, only heartbreak.
Oh my God
Muichiro and Tanjirou playing paper planes together, with Tanjirou not really good at it.
Mitchikatsu and Yoriichi playing kites together, with Yoriichi getting the strings tangled up around him.
(also someone said the paper planes represent Muichiro going to heaven and Tanjirou having close calls but still won't die)
Reincarnated AU with Yoriichi but make it like a Manhwa genre
Kny ramble, (I should start numbering these lol)
Remember how Kokushibou said that whenever he and Yoriichi talked about how their breathing styles have no successors, and Yoriichi suddenly becomes optimistic and smiles? I shared the same confusion with Kokushibou, on why Yoriichi seems quite delighted at such idea.
Then it struck me that probably means, having no need to teach breathing styles means no more demons. The Breathing style started as a way to enhance the body for Yoriichi, a way to utilise the body to become better in terms of movement and maybe health...before being seeing as a weapon. It's being weaponized. For greater good, granted, but still. And Yoriichi hates conflict.
Having no successors can be meant that breathing style is no longer needed because demons are gone. But there's a possibility it can be used for another intention, and Yoriichi, who has seen how greed and envy influenced his brother, guesses that breathing style could take a very, very bad turn.
A way to get the body stronger? Faster? For what purpose? Violence then, if not for demons slaying.
Yoriichi is probably grateful that the demon slayer organisation is a hidden one, a small community that has only a small splotch of corruption between the slayers from the difference in morals, and that not everyone believes in demons.
Breathing style can be used for a good cause...as it also can be weaponized for destruction.
I am not particularly fond of how some people portray Yoriichi to be obsesses with Mitchikatsu/Kokushibou.
Like, yes, he really loves his brother. Mitchikatsu and their mother are the only ones who shows him family affection and love. Of course Yoriichi loves them both dearly. But to the point of obsession? Yeesh.
I don't like how some portray Yoriichi to be super clingy with Mitchikatsu/Kokushibou, or tries to make his brother stay with him all the time, being a yandere to his brother and glare at others who try to get close to him. Not to mention some even ship them! They're brothers!
Okay, so,
When Yuichiro died, he passed with his body facing down.
When Muichiro died, he was standing.
When Yoriichi died, he was standing.
When Kokushibou/Mitchikatsu died, he was on his knees ( I think ) as he crumbled away.
I feel like the way Yuichiro and Kokushibou death position means something like, " It's over, I gave up. I couldn't even accomplish something I've been longing for, no matter how hard I tried. I don't care anymore, just take me now. "
Because Yuichiro couldn't protect Muichiro, and Kokushibou couldn't surpass Yoriichi.
Meanwhile, Muichiro and Yoriichi position feels something like, " I tried my best. Even if my part has little effect, at least it's something. I worked hard. I tried. I couldn't finished what I intended to, but I hope I have left something effective. "
Muichiro didn't managed to finish Kokushibou fully, but he gave him a large damage and died standing with his hands clutching his sword into Kokushibou's torso. Yoriichi died standing as well, not being able to fully finish Kokushibou, but still clutching his sword and gave enough damage for the opponent.
And all of their life, their only mind was occupied about their brother. What to do with them, how do I protect them, how can I surpass him, etc.
Just their brother.
:(