Street Fighter (1987)
The first Street Fighter (1987) offered a limited roster: Ryu and Ken were the only playable characters in versus, alongside ten opponents (Sagat, Adon, Birdie, Eagle, Geki, Joe, Lee, Gen, etc.).
Many iconic characters from the saga (Chun-Li, Guile, M. Bison, etc.) only appear starting with Street Fighter II or the Alpha series.
As for Mike, who appeared in Street Fighter (1987): is he actually the same character as Balrog?