Here's some sprites I dabbled with.
I quite like what you've done here. They look more cohesive in general. Maybe Yoko and Charlotte are still a bit too bright compared to the others in the same set (compare, for example, Yoko with Jonathan), but it's hard to say... I'd suggest potentially reducing and unifying the palette.
I tried polishing some Saturn's sprites a bit, but I'm not great at animating, so I don't think this will go further than a simple "study".
If anyone wants to tackle these, please go ahead.

I've always found Saturn's sprites subpar compared to the rest of SotN's graphics, so I may try to do the same with a few more, since we have so many rips here...