This looking neat so far. :) I'm honestly impressed with the many details you're putting into drawing their battle gear, especially the sketched linework put into their gloves and gauntlets and the bags/pouches that they're carrying.

I llike the concepts you used for their tails as well, with the one on the left having mixed leather straps wrapping around it and the other one on the right having a cybernetic appendage for a tail.