I saw someone say that soukoku is mostly due to Dazai and there’s not a lot of evidence pointing to chyuua being queer coded or having romantic feelings for Dazai. So I was wondering if there’s any cannon evidence pointing to it and if irl chyuua was bisexual or something like irl Dazai

hiii!! sorry if this is a little late lol

now that you mention it, yeah, a lot of the evidence backing up soukoku actually does come from dazai. funnily enough, i actually have a whole list on my phone dedicated to soukoku proof, and when i went to look through, most of it was due to dazai lmao.

however, just because most of the evidence comes from dazai, that doesn't mean all of it is.

any sort of evidence we have for chuuya's possible romantic feelings for dazai is very subtle and scarce. most of this has to do with the fact that chuuya appears in the main story infrequently, and the only times we get any insight into how he thinks and feels mostly come from the light novels detailing his backstory. for me, the most significant instances of chuuya's affection for dazai come from the symbolism behind his exposed hands, the dragon battle in dead apple, and the small comments he makes about dazai.

i've already discussed chuuya's hands a bit in this post:

if you don't wanna go through the effort of reading all of that, basically, during chuuya's battle against rimbaud, chuuya removed his hands from his pockets for the first time in fifteen. he stated that he had kept them away until then because he was reserving himself from fighting properly for when he found himself in a situation that really called for it—in that moment, he genuinely needed to defend himself and found the desire and desperation to keep living.

in the present day, chuuya doesn't keep his hands in his pockets anymore, but instead, he hides them with gloves. the only times we get to see him take them off is when he activates corruption, a situation where he's desperate enough to put his life at risk, and a situation he's only willing to put himself into if he trusts dazai enough to save him. chuuya's attachment to the life he lives becomes clear when he's with dazai, and he's willing to risk it all because his faith in dazai is just that strong.

a perfect example of this would be in dead apple when ango told chuuya that dazai had definitely died, and chuuya basically replied by saying, "dazai can't die but even if he is dead, i'm completely fine with dying with him". on top of that, chuuya isn't supposed to be lucid when he uses corruption, yet he screamed dazai's name multiple times and held back his strength to punch dazai just enough to get him to swallow the antidote in his mouth. this means that chuuya's resolve to save dazai was strong enough to rival a god.

then there's the things he says during their sparse meetings in the main story that seem insignificant at first. however, it's important to remember just how deathly afraid chuuya is of vulnerability after experiencing so much pain and loss in just a few years (betrayal of the sheep, loss of the flags, N's torture, etc). these issues likely just got worse after dazai left the port mafia. when you take that into account lines such as, "back then, your 'spite' was almost an art. you made a fool of everyone, be them friend or foe" and "the night you disappeared, i opened a bottle of petrus 1989 to celebrate. that's how much i hate you, bastard" take on a brand new, much more agonizing meaning. comments such as these are likely chuuya's subtle way of telling dazai that their separation hurt, and separation only ever really hurts when you truly care for the other person. chuuya opening up even by that much is already impressive when you remember just how terrible both sides of soukoku are at communicating.

as for any evidence coming from irl chuuya, there's not really much lol. the only queer irl equivalents of bsd characters that i can think of rn are dazai, ranpo, yosano, akutagawa, verlaine, and rimbaud lol. chuuya was heavily influenced in his works by rimbaud and verlaine, but idk if that's really saying much lmao. however, a lot of bsd's story takes inspiration from the works of the irl authors and poets mentioned, and irl chuuya's poems such as some parts of "sheep song" speak of loneliness and heartache—that could possibly be reflected in c! chuuya's characterization in bsd.

anyways, chuuya's feelings towards dazai hardly ever get expressed in bsd, and most skk evidence mostly rests on what we know about dazai's feelings, but it's not like there's nothing to prove that chuuya doesn't feel the same way.