Vampire - Darkstalkers Collection - Platform: Playstation 1

Marionette:
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In Vampire Hunter and Vampire Savior 2, highlight the random select box 
press "start" button seven times then press any button.

Shadow:
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In Vampire Savior, highlight the random select box press "start" button 
five times then press any button.

Alternate Donovan:
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First you must play in either Vampire Savior (secret version), Vampire 
Savior 2 or Vampire Hunter 2. At the character select screen, highlight 
Donovan, hold Start and press any attack button.

Alternate Phobos:
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First you must play in either Vampire Savior (secret version), Vampire 
Savior 2 or Vampire Hunter 2. At the character select screen, highlight 
Phobos, hold Start and press any attack button.