Heaven's Gate Codes -

Fight as Unknown (Angel boss):
Finish the game with the difficulty level set to normal or higher using a character with a Devil alignment.

Fight as Geezer (Devil boss):
Finish the game with the difficulty level set to normal or higher using a character with an Angel alignment.

Fight as Kurara:
Enter arcade mode and highlight Nanase. Press Select, Up, Down(2), L1 + L2, Start. The screen will flash to confirm correct code entry. Highlight Nanase. Press Start to scroll through the two versions of Nanase and the two versions of Kurara.

Fight as Kyohya:
Use the "Fight as Kurara" code. Enter Vs. mode and highlight Verny. Press Select, Left, Right, Up, Down, R1 + R2, Start. Kyohya will appear next to Verny.