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Get win WINMUGEN.

What is M.U.G.E.N?
 

Mugen is a word of Japanese origin, meaning dream, fantasy, or infinite... M.U.G.E.N is a freeware 2D fighting game engine designed by Elecbyte, released on July 17th, 1999. The program was written in C with the Allegro library. Beta versions  were made for DOS, Linux and Windows, and was distributed through their website. "M.U.G.E.N" is actually an unknown acronym.  The creators, Elecbyte, never told what it was.  In fact, they admittedly stated that they forgot what it stood for.

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Basically, M.U.G.E.N allows users to create their own 2D fighting game, using the core game engine provided. From the characters, to the stages, to the background music, to the life bars & power bars, text font, and even in-game character stories... You can create pretty much anything you want once you learn the programming, and it's not incredibly hard either. If you ever had a dream of creating your own fighting game, M.U.G.E.N is a good "practice run," to say the least.

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Creating a character is a fairly elaborate and time-consuming process, as "contributors" or "creators for M.U.G.E.N" actually taking the time to rip the sprites, and code it from scratch. Some use the original characters and sprites themselves; others use existing sprites to create "other" various recognizable characters, others use the and the die-hards actually create their own 2D sprites and animations from scratch. 

...Some Capcom and SNK characters, "made" by creators, play nearly exactly the way they should from their original games! But characters for M.U.G.E.N aren't limited to Capcom, SNK, or Sammy characters as you can see from the pics. As long as it's a 2D sprite, you can put it into M.U.G.E.N... And there's no limit to how many characters you can put on the game, well, it really depends on the size of the selection screen that users can also create from scratch.