Awesome work. I love how you gave each face its own characteristic outside just the expression. Good take on the whole bunch. The spacial backdrop fits my major themes too, so nice choice there.
And yeah, technically only 4 of them are what you call the "basics". Purrcy is more like a substitute pick being one of Metal's romantic interests, but I haven't really introduced any of the other "Professional Freelancers" yet so she'll do when needed.