> Before selecting a character at the Character Select screen, push the Y button to toggle between alternate costumes for the given character.

> Select Sophitia and press one of the following buttons from the selection screen and keep pushing it until you see Sophitia do her pre battle pose.
X = pink undies
Y = blue undies
B = black undies
R = yellow undies (press R after you choose her or she'll be in metallic mode!)
A = white undies (original color)
(courtesy: GameSages)

> Complete = beating the Arcade mode on Normal difficulty using a different character each time.

• 1 Complete - get Hwang
• 2 Complete - get Yoshimitsu
• 3 Complete - get Lizard Man
• 4 Complete - get Water Vain area
• 5 Complete - get Siegfried
• 6 Complete - get City of Water area
• 7 Complete - get Rock
• 8 Complete - get The Colosseum area
• 9 Complete - get Seung Mina
• 10 Complete - get Cervantes
• 17 Complete - get Edge Master (awesome!)
• Buy Picture #15 - get Museum Character Profiles
• Buy Picture #21 - get Remain in the Desert area

> To play as the Unknown Soul version of your character, hold R when you select him or her. This will make your character translucent.
NOTE: This code will only work AFTER Edge Master has been released.
(courtesy: GameSages)

> During a Replay just press X to zoom in, Y to zoom out, and use the D-pad or Analog pad to change perspective.