Entire figure Air Chariot Serpentor
I admit it I really like Serpentor. Yes I like him more than Cobra Commander and as a kid I was excited to finally see a leader for Cobra who wasn't a coward and got things done. Unfortunately Hama didn't like the character and Serpentor died a quick death in the Cobra Civil War. Devil's Due brought him back for an equally unfulfilling storyline and death in their book as well.
SO this is based on the cartoon. A few customizers did these changes over a year or so ago to their Serpentor figures. I liked the changes so much that I did it to mine as well. I added the front leg armor, the silver gadget on his arm (which I always figures was a dart gun or a communicator) and then added some paint to make him resemble the cartoon better.
Lastly I repainted his face to add a level of menace and anger as opposed to confused consternation that the original paint job displayed.
Overall I wanted him to look big, intimidating, and ready to kick some tail.