1.Put the game on level 0 difficulty and play through the entire game
with each character. When you've finished you'll have all the
counterparts.
2.Change the game to level 5 (hard) and beat the game with Vermilion
to add Sho to the character select screen.
3.Change the difficulty again to level 6 (very hard) and beat the game
with Vermilion again to gain Abel.
4.Change the difficulty to level 7 (impossible) and beat the game with
Abel to get Veil.
5.Finally, leave the difficulty on level 7 and beat the game with Veil
to get a little girl named Naru. She has the same moves as Kayin.
Do not use any continues to get the 4 bosses!
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Camera Trick:
Go to the Key Configure screen. Place the cursor on any of the L or R
buttons. Press L1 + L2 + R1 + R2. If done correctly, the controls for
the L and R buttons will be changed to camera view controls. You can
now rotate the view freely, though the zoom function seems to be
missing.