Based on the Robot Rebellion sketch of Iron Fist... I originally intended to give him some weapons, primarily a Bo Staff as his weapon of choice, but thought that a guy who is named Iron Fist wouldn't need weapons and just use his (Iron) Fists for battle.

Basically he would have undergone heavy training as a martial artist in his homeland of China, and worked hard to get fists of iron.

He would be China's representative to the G.I. Joe team to combat the Robot Rebellion.