My Solid Snake for Mugen!
Solid Snake has a plethora of MGS1-themed special moves and super combos. He is a slightly toned down MvC style, with chain and air combos and such. I must say this in big bold print, since I had to reiterate so, so many times on various forums:
THIS SNAKE IS BASED ON HIS DESIGN FROM THE FIRST METAL GEAR SOLID!