I'm trying to unlock Akuma and Gouken on SF4 for PC (Steam Version, not Super Street Figher).
So far I got Sakura, Dan, Gen, Rose and Fei Long. I explained how to unlock them in the answer.
What am I missing ? There are still 4 unfilled boxes on the menu. 2 characters I know who are: Gouken and Akuma. I suspect one other is Seth. Who is missing ?