Original URL: http://www.psxextreme.com/psp-cheat-print/84.html
The Legend of Heroes: A Tear of Vermillion
Secret characters in Eiyuu Densetsu 3 (Japanese Version)

This is for the Japanese version of Eiyuu Densetsu 3 (but if the game hits the US, it'll likely end up the same code). Beat the game and save your file to the very same memory stick. After saving, restart/reboot the game and you'll see your new characters available as a message will be displayed for them.