>>81629929/vsinger/ has a list of singing chuubas, the four stars being Nina, Lumin, Clara, and Roca.
Nina is great but still a bit amateurish, her stamina isn't very strong but her skills are undeniable. I'm excited to see her keep growing as a singer. Her content isn't that strong on its own, but it's very hard to dislike her for any reason. If OP isn't a shitpost, Nina's the one to follow.
Lumin is incredible, she's actually worked in the anime industry for OP/EDs and her JP live singing is, in my opinion, legitimately the best among the EN chuubas. Sadly, her karaokes are 90% zatsu. In other words, if you like yappers, Lumin is 100% someone to keep an eye on.
Clara, included in the OP, most people here know of, she's a schizo weird millenial hag who's unique and unfiltered ideas really make her personality... and singing, shine.
Roca is an inoffensive and safe choice for a vsinger, her jazz karaokes are amazing. Unfortunately, a bit of a standard streamer so you can only really recommend her karaokes.
If I were to describe Nerissa, she'd be a great technical singer with tons of experience with recording and producing covers, but her live singing isn't that amazing. She shines in collabs, but also a standard solo streamer.
ERB, I honestly haven't heard or watched enough to form an opinion. Maybe in a few months. From what little I've seen, though? IRyS should be in her place in the OP.