Fighter's Impact Codes -

Alternate costumes:
Highlight a fighter on the character selection screen. Hold Circle + Square and press Start.

Small characters:
Highlight a fighter on the character selection screen. Hold Down + X + Circle and press Start.

Deformed characters:
Push Select(10) at the title screen. A chime will confirm correct code entry.

Paper cut-out style characters:
Push Right(10) at the title screen. A chime will confirm correct code entry.

Stick figure characters:
Push Left(10) at the title screen. A chime will confirm correct code entry.

Hidden characters:
Complete the game four times to unlock the four hidden characters.