To play as Evil Ryu, highlight Ryu then press START twice.

To play as Special Sakura, highlight Sakura and press START five times. If it worked her clothing will change.

To play as Shin Gouki (Super Turbo Akuma), highlight Gouki and press START five times.

To play as the Street Fighter 2: Champion Edition of a character, pick either Ryu, Ken, Vega (Bison), Sagat, Dhalsim, or Zangief then press START once. Your characters color should change if you did it right.

To play as the Street Fighter 2: Champion Edition of Chunli, select her and press START twice.