Original URL: http://www.psxextreme.com/psp-cheat-print/7.html
Darkstalkers Chronicle
Unlock Secret Characters
Perform the following at the character select screen:
  Shadow: Highlight ? and press Start 5 times, then press any button.
  Marionette: Highlight ? and press Start 7 times, then press any button.
  Demon Bishamon: Highlight Bishamon, hold the Start button, and press any button.

Activate EX Option Menu
Hold the Left trigger while selecting "Option" from the main menu.