With both Hakusan and Chougi being added to game, I was hoping to lots of interaction between them along with idea of the government apparently having actual swords working under them being played with (do swords have office jobs? do they work 9 to 5 shifts?) and not just the saniwas, but since everyone much prefers Chougi to interact with Nansen and Manba it's rare content to find. Hakusan doesn't even get mentioned much with Ichii nii or Koga despite also having unique lines in game with them as well which is a shame.
I'd say Shizuka does get a bit more attention than Hakusan, but because he didn't turn out to be tkrb's version of Belial from GBF a lot of people have completely dismissed him afterwards, though I really enjoy the contrast in his flashy appearance and gentle demeanor (minus when he's around yari). It's even more amusing when you realize that Tomoe, who's basically his sword twin, is more the one with the personality you'd initially think Shizuka to have despite his proper appearance.
For Buzen, I hope when the Gou from the movie is finally put into game that he'll be appreciated more for the supportive big bro he is. I also need more people to think about him unironically loving the Initial D ost and listening to it all the time since that's something I've always though since I saw him, I guess it's style he's drawn in. I've seem a few jp artists begin to draw him and Kotegiri more thanks to the movie but it's still only a tiny corner compared to the same popular swords from when the game initially released so I can only hope for both new Gou to help him out or for DMM/Nitro to make him relevant for a moment in something.
And this doesn't even mention in full other interactions I'd like to see, such as Kotegiri and Midare forming an idol group together since they both seem like they would be on the same page for that. Sorry if this was a bit long, I just like all the swords too much.