When you have beaten the game go to the 'Extras' option and you will be able to view character profiles, dialogue from the chapters and images from the game. It is also possible to listen to music, SFX and Characters from the game.
When you have a Game Save File on your memory stick of a previously beaten game you will get a message. The first part of the message will tell you that you can now go to a place called Mysteria Ruins which is directly north of your starting point and the second part of the message will tell you that ALL the characters will be available in random battles.
Watch through the ending and credits at the end of a game you have successfully beaten and press 'A' when the word 'Fin' pops up. You will then be prompted to 'Save' and a star will appear to the right of the file. Reload the file and start a new game and you will have ALL you characters, equipment and levels. If any of your characters had any Blue Hearts they will have turned back to red. If you go north to where you start you will reach a bounus area which is now unlocked.