MechWarrior4: Mercenaries. Flea.
A light mech that was a real blast to play IMHO.
This isn't the best drawing I have ever done, but I think the final in-game model turned out really well. I have to give a lot of credit to the modeler, Michael Richard, for taking the drawing and turning it into the battle machine you all know from the game. The proportions had to be changed (for the better) to fit one of the existing skeletons from MW4 Vengeance so it could share animations.
The old design for the mech isn't that bad but it sort of looks like a cooler with legs and we all thought it was a bit boring. A lot of my mech re-designs had to go through a lot of revisions but I think I only had to do this one drawing for the Flea and Microsoft approved it right away.
Here's the old design... [link]
and here's amore recent drawing of the old design... [link]