Unlockables brought to you by
Complete Survival Mode once. Then at the character selection screen in Versus or Survival Mode, highlight Sion, hold L1+L2+R1+R2, and press X.
Defeat Dauragon in Story Mode
Watch the scene where Dominique destroys the PD-4s in Story Mode. After that, she's unlocked.
Defeat Echidna in Story Mode.
Defeat Kaldea in Story Mode.
Use Kou to complete Story Mode. After that, Leann will fight Kou. Defeat Leann to unlock her.
Defeat Maskless Mugetsu in Story Mode.
In Story Mode, infiltrate the Mikado Building with Kou and complete Story Mode. Then at the character selection screen in Versus or Survival Mode, highlight Kou, hold L1+L2+R1+R2, and press X.
Defeat Mugetsu in Story Mode.
Defeat One-Armed Dauragon in Story Mode.
Defeat Overall Dauragon in Story Mode.
Defeat PD-4 in Story Mode.
Complete Story Mode two times. On your third game after you defeat Overall Dauragon, you'll have to face Dauragon again for the last time. Once Shirtless Dauragon's defeated, he's unlocked.
In Story Mode, have Volt or Kou infiltrate the Mikado Building. Next, have Volt or Kou fight Kaldea. Then, have Sion fight Dauragon. Then after that, Sion will flashback to the past where he is about to fight Wong. Defeat Wong to unlock him.