Alright I'm going to give my reasons now lol:
Hoseok, Gryffindor: Hoseok to me is honestly very much Gryffindor, but in slightly different ways. I said in another comment that to me, he's a lot like Ron with Hufflepuff traits, but predominantly Gryffindor. Putting the bravery and courage traits together, I've always seen Hoseok as someone who, if you ignore his personal fears of things such as heights and snakes, is very brave and strong in a personal way - he defies others misconceptions about him and can prove people wrong about said misconceptions. He faces the fears he has (much like how Ron very much faces his fear of spiders) to either benefit himself or others. He can also be snarky sometimes lol. While I do agree with a lot of points to why he could be a Hufflepuff, idk I've always seen a Gryffindor.
Jimin, Gryffindor: Jimin honestly is a lot like Hoseok to me as regarding traits - especially with the misconceptions and proving. But a lot like Neville in a way? Lacks the confidence he truly needs and should have but despite this proves he is strong and brave about different topics.
Yoongi, Slytherin: Yoongi aaa Yoongi to me is very Slytherin but a Draco type of Slytherin. Cunning in a way, extremely ambitious and driven to be a perfectionist. While a lot of people always see the relation between Slytherins and Gryffindors, I have always seen Slytherin and Ravenclaw sharing traits especially the intelligence trait, but both very differently. Ravenclaws are intelligent in a theoretical way whereas Slytherins are intelligent in a practical way - and to me Yoongi is very intelligently practical as he puts this intelligences in what he does. A lot of people see Slytherins as cold and heartless but I think Draco is a good example of how that is a misconception and how it relates to why I see Yoongi as one - Draco, be him a Slytherin, he cared extremely for his family and would do anything to ensure their safety and wellbeing even if it meant he'd be lesser off (maybe not so much younger Draco but as he got older he was willing to risk a lot to make sure his family stayed safe by joining the Death Eaters even though he was seemingly against it and knee the risks) a lot like how Yoongi cares extremely for Bangtan and, as we know, sacrifices a lot to ensure their wellbeing.
Jungkook, Slytherin: Jungkook a lot like Yoongi in a way but more Hufflepuff traits too (like Slughorn) especially the hardworking and loyalty traits. But that boy is cunning and sneaky when he wants to be and tbh knows the power he has as the maknae.
Namjoon, Ravenclaw: I honestly think this is kinda obvious. He is very intelligent and logical in how he things but, like most Ravenclaws, basically useless putting this intelligence and logic in a practical form (can confirm as a Ravenclaw) - it's like when he thinks and speaks you can see the cogs churning but his actions don't relay what he seems to want to do lol. Namjoon is wise, oh so very wise and creative too and this always shows in how he thinks and acts. A common misconception is that us Ravenclaws are good at everything but honestly that is false as we're only good at what we have an interest in and Namjoon clearly shows this.
Seokjin, Hufflepuff: Jin is annoying to place because he's basically the avatar of Hogwarts houses but a Hufflepuff is where I've always seen him. Hufflepuffs are very hardworking and how can you look at Seokjin and think he is anything but hardworking. He cares so deeply for the other members and while Hufflepuffs aren't necessarily the most competitive house (except in Quidditch) they strive to do well in what they can. Hufflepuffs honestly to me have always been the house which is sort of the love child of all the other houses as by looking at Hufflepuff members they all share Hufflepuff traits but traits of the other houses (how I see them: Cedric - Ravenclaw, Tonks - Slytherin, Teddy - Gryffindor) and idk I see Jin like this too.
Taehyung, Hufflepuff: You've all made me question about Tae being a Ravenclaw but I'm sticking to my guns because he has always seemed like a Hufflepuff to me. Hufflepuffs seem very calm and collected about things but as soon as something sparks them they will fight lol but honestly I can't really add much more than I've said for Jin.