Japanese	American
There are 4 unplayable boss characters in Street Fighter II, and 3 of them had their names switched around for the American release. M.Bison in Japan is Balrog in America. This was done to prevent Mike Tyson from starting a lawsuit against Capcom.

Japanese	American
Balrog became Vega.

Japanese	American
And Vega became M. Bison.

NOTES

-In the Japanese version, each character has several different win quotes. The American version gave each character just one win quote.