I have tried since I got this game to download a save file with all the characters unlocked (as I don't really have time to unlock them all myself).
I have the Japanese version of spawn and have tried both U.S. and Japanese Save files from BTSwirl and Gamefaqs... neither open up any hidden characters.
Grab Revive DC's Capcom Taisen Fan Disc release or Capcom Vs. SNK Collection release which also has the former packed in. Taisen Disc has almost every save file for Capcom DC library. This includes Spawn ITDH!
Have fun!
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I took out my old DC battery and soldered a battery holder and put in a rechargable CR-2032 battery into it and everything worked. I put in the date...