Highlight Yun at the Street Fighter 3 character selection screen and
press any Kick button.
Fight as Gouki (Akuma):
Highlight Sean at the Street Fighter 3 Second Impact character
selection screen and press Up.
Fight as Gill:
Successfully complete Street Fighter 3 or Street Fighter 3 Second
Impact under any difficulty setting. Highlight Sean at the character
selection screen and press Up(2).
Sites: