Fight as Pyron:
     Defeat Pyron in arcade mode. You will also unlock his stage.

Fight against Ingrid:
     Win  each  round  of  your  first three matches with at least one
perfect finish.

Fight against Shin Akuma:
     Successfully  complete  the game once with each character, except
for Pyron. Shin Akuma will appear after Pyron is defeated when using a
team containing your last set of characters.

     Alternately,   complete   the  game  in  arcade  mode  under  any
difficulty  setting, winning all rounds including those against Pyron.
Also  have  at least two Perfect finishes and at least one super combo
finish in each match. Shin Akuma will appear after Pyron is defeated.

Fight as Shin Akuma:
     Defeat Shin Akuma in arcade mode.

Classic Character Sound Themes:
     Successfully  complete  the game to unlock classic themes for the
characters  used in the "Sounds" option. To unlock Shin Akuma's music,
defeat Pyron as Shin Akuma.

Select Victory Pose:
     Press a Kick or Punch button after winning a round to change your
victory pose.

Switch starting characters:
     Between  matches,  hold  two Kick buttons. When the match begins,
you can start the round with your second selected character instead of
your first.