Awesomesauce, thanks for the details. I'll try checking around on my own pace, so this is a good way to start.A lot of what I've found so far is based on hearsay and a friend's tip but for the ones I watched regularly, I can at least confirm that they're indeed the same person.
So far the ones I could find besides hana are:
There are a few more I saved but those needed more research first so I decided not to put them here for now, the interesting part is that they're all following each other on twitter as well so if you wanted to be extra autistic you can probably run your own research and possibly spotting more ex-id's on their followingshttps://www.youtube.com/@esmilia miyu (sidenote, the acc started posting content since august 2022)
https://www.youtube.com/@KazuKazu95/streams reza
https://www.youtube.com/@ghostofapudding zea
(Twitch link here) hyona
https://www.youtube.com/@chiachasm possibly nara
As a bonus, I saw a hyakumantenbara salami cosplayer on the same day I saw the ina cosplay I posted before, might as well share it here.
Still nice to see niji cosplay amidst all them Hololive cosplays, even more so if it was nijiJP. Now if there's holostars cosplayer here, that would be cool