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Gura has the most raw talent, but needs actual training.
Suisei has decent talent but has a lot of pro training that elevates her a ton.
Kanata started pretty strong in all aspects but is losing it rapidly due to going deaf.
Towa is amazing but only with certain type of songs.
Risu can be one of the best, but rarely shows her powerlevel.
Flare is severely underrated.
Watame and Nene really shine as backup/group singers for idol style songs.
Best overall is AZKi followed by Sora