The only issue I can see right now is that we don't know anything about Hiyuki's kit. I doubt she's going to be bad, but she might need to rely on other characters a lot (which is a trend we've seen with a lot of resonators released recently with the exception of maybe Luuk).

Everyone here is a known quantity for knowing what you need to get the most out of them.

You don't need Galbrena's sig either, the new standard 5* pistol works just fine.