Here are some others for the RPG I was doing concept sketches for. The only direction I received, besides some vague character descrptions, was to go for a "70's Robotech" feel. I think some of them need bigger hair.
These guys are called "runners". Kinda like super-messenger boys.
Some other armored dude.
And then these guys, who were explained to me as characters who never talk, always have these teeny floating orbs around them that can do a multiple number of things. I'm thinking of adding a mouthpeice to the helmet and redesigning the top, 'cause i think it kind of sucks.