>>6741604best is a loaded term. the most pitch perfect member is IRyS, but she has probably never performed live before so she hasn't learned how to sing live or play off an audience. AZKi, Sora, and Nene are by far the best at parapara style Idol performances. We'll see how ID and EN do when they get their 3D models. Suisei has a really all around decent voice and great performance as well, but I don't think she is quite as good as IRyS or Sora in either category (but she's good at everything so who cares). Towa's range is just nuts and makes her a great foil for a lot of the more intense duet songs. Her voice always sticks out on stage, she has real power. Gura's vibrato is crazy accurate, when she crescendos off a note it's something special. The real question is can she work a 3D model on stage the way she does her live streams. Her pitch can swing sharp at times, however, but it's mostly due to her character voice being a kind of falsetto. Calli probably has the best range of any talent to date, she just has no self-confidence yet.
The WORST? God, who cares, it's some weird toss up between Polka and Ame, but both of them play it off like comedy.