We'll probably need to wait until Memory or later to get a real feel of the JP audience, not to mention a couple weeks for the debut hype to wear off but assuming they can settle somewhere in the 300-400s and continue growing from there that would be a really strong start for a foreign companies first real attempt at breaking into the market.
Clara's obviously gonna be an outlier given her earlier slot and being a native EN.
Also Pico likely confirming her being a foreigner, I know she mentions Phase World for kayfabe reasons but it seems like something she wouldn't have brought up at all if she was a native.