Namco Bandai will hopefully add more characters with the planned DLCs for the game but for now, you should focus on unlocking these hidden characters.
How will you do that? Following guide will help you out:
You will get the character through Best Buy pre-order in America and the Europeans can have it as a part of collector’s edition. Otherwise, you will have to wait for the appropriate DLC with this character.
You will unlock this character when you complete the story mode with any character.
She will be unlocked on the completion of story mode with any character.
Defeat Algol in the Legendary Souls mode and then complete the mode to unlock the character. You can also unlock him by defeating him in the quick battle as the opponents Teramos or Minami Naikos.
Story Mode completion with any character is the requirement and you will unlock Edge Master.
She too require a completion of story mode with any character.
To unlock, defeat him in the arcade mode with any character using the Asia route. You can also unlock him by defeating him in the Legendary Souls mode and then completing the mode.