Gargos:

At character profiles screen appears, press Z, A, R, Z, A, B. You will hear a laugh if the code is entered correctly.

Access All Options:

Without defeating the game in high difficulty levels, you can access all options by waiting for the profiles screen to appear and pressing Z, B, A, K, A, Z.

View the Ending Credits:

Wait for character profiles to appear. Press Z, L, A, Z, A, R.

Select from All Colors:

To access the white, shadow, or gold colors for any character, wait for character profiles to appear. Press Z, B, A, Z, A, L.