I'm rather canon blind to most of your characters, so I can't speak to characterization, but I can say that I'm really enjoying playing with all of them so far! They're all so varied and you handle all their individual voices well! Yamamoto is so cute and cheerful and I really liked his intro threads.
I'm also super impressed with Jamie, since she's the kind of character who would be different depending on who she's playing with. I know you've mentioned in the past some concerns about whether she's best for Kiseki's setting, but for what it's worth, I think you're doing a great job with her and I'm enjoying seeing her interact with different people!