very rough but tried to squeeze some personality into a few of them...
i like the vibe of the colours but i feel like u could benefit from a few extra shades here and there and it might make sense to recycle more colours across the sprites.
Those look really incredible, there is definitely some more interesting vibes coming from these. I actually intended on each of these being as generic of a version of themselves as possible, very neutral, like a collection of absolute nobodies, plus they will be simpler to animate, but what you have would be more impressive in the end. I really appreciate the edits you do for me, they are certainly insightful.
I feel like the vampire needs to be paired down a bit. He has a lot going on in terms of color and clothing, so it makes it a bit harder to read compared to the rest.
I'd make him a bit simpler or heighten the contrast between clothes.
I think I'll recycle some colors from his torso into his pants, I know that goes against the idea of contrast, but I feel this will help with readability.