S2: Four Kings - Bison, Vega, Sagat, Balrog
S3: 3S/USF4 - Dudley, Urien, C. Viper, Alex
S3: ST/USF4: Fei Long, Gouken, T. Hawk, Hakan
There are a million characters I want back, honestly. Hopefully the final version of the game has at least 40 characters, they are too many great ones to leave...