Yeah, send me one.
Oh wait, you want suggestions for figure designs, not what to do with them...
So far you've got a pattern of doing more a sci-fi armored kind of look.
If you wanna continue that, I suggest something clockwork and/or steampunk, as both would give ample opportunity for little details and flourishes that the all-around printing could really show off.
If you wanna get away from that, I suggest something with many clothing layers, and perhaps a nice overcoat. Something more vintage and historical perhaps. That being said, other than wrinkles in the cloth and seams and things, you couldn't do that much on the arms or back. Maybe different emblems, but not much.
You could also go with a more civilian type outfit. There's a lotta sci-fi soldier type customs out there, but not as many adventurers/miners/workers. Maybe because there isn't as much demand, but it may be worth thinking about.
Whatever you choose, try to make it unique, and not just a detailed or slightly different version of something Lego is doing. And I'm sure whatever it is will come out looking really great.