This is an interesting assortment of characters. And yeah, that chick.
really solid work. well done. the gal seems to be hitting the gym hard. what an ass
The chick's back sprite is the strongest of the group I think, you nailed the pose (and she been working on them legs and glutes.)
It's great how different the body types of the characters are, even though it can be hard to do in an isometric perspective. I'm not so sure about the orange shading on the blue armour (2nd from bottom), but otherwise there's really nothing to fault here. 
Great piece! I like the variety in the designs