>>7596507>indie vsingersNIna is mentioned in /vsinger/ quite a bit, yes. But feel free to check out that thread if you are actually interested in good vsingers. And yeah, I'd say Irys is okay, just not as good as expected. As people have said before, her pitch control is excellent, but she lacks the strong head voice that, say, Suisei or Gura possess. And outside hololive you can find many more impressive singers.
Lumi.... I think I followed her in hope that she'd play strategy games like starcraft. Her live singing is, I'd say, decent but not great. She lacks a lot of control, especially for the higher notes.