I was playing with my LEGO Mindstrorm Nxt when I build this humanoid. It doesn't use any motors though. But it can help being a model.
This used up lot of pieces, so you might need to be ready for it (not quite many actually)
Step 1: Make the arm
The arm, forearm, and crab hands are shown here. My model isn't perfect because it doesn't have any head and proper hands. But, just go ahead.
Step 2: Make the shoulder
Just follow the pictures. The pictures might not be clear, and I'm sorry for that because my camera is 0.1 Mega Pixels (My cellphone's).
Step 3: Make the leg
These are legs and feet.
Step 4: Make the body and the bag pack
These are body and it's bag pack. I made the bag pack so that it didn't look to skinny. You could proof it by removing the bag when it's done. Ugly, right?
Step 5: Assembling
Follow the pictures, assemble the LEGOs - Click! Click! Slack! - And you're done!