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She's hidden it in unarchived streams but Owl actually is untapped potential. She needs coaching but she's got really good tone. I really wanna see if she gets better once she starts putting in vocal coach reps and/or releases her limiters.
Moona is probably best amongst "belting" talent. Like, full-tone diva songs. Suisei, same flavor, just a bit weaker - not enough to be a 'bad' singer by any stretch, but between those two Moona takes it.
Gura is good in a different way - she'd never overpower Moona or Suisei, she's like a completely different kind of singer, more the soft 90s contemporary pop artist.
Towa has power but she's way too limited - if a song isn't made for a contralto, she's out of her depth, but she's fantastic there. Risu's low voice rivals Towa, but I think Towa is stronger in the low end - but of course treerrat's party trick is having a perfectly-adequate head voice (higher pitch). But honestly, crucify me if you want, I think Risu gets along more on having the party trick of both her registers being "pretty good" rather than either one being "outstanding" - her sheer range is amazing, but for cutesy uwu voice Gura mogs her, and in the lower end either of Moona or Suisei can fuck her up. Kanata (pre-progression-of-her-ear-issues) is basically same boat as Risu, fantastic range, but not exactly creme de la creme except in how far up and down the scale she can go and still have a recognizable pitch.