Complete the game, then press A when "Fin" appears after the credits, and save the game when prompted. Load the cleared saved game file to restart the game will all previously attained levels, characters, and items. You can use any character in random battles. You will also unlock options at the "Extras" menu that allow character profiles to be viewed, look at dialogue from the chapters, and listen to the music, sound effects, and voices. Additionally, a new area called "Mysteria Ruins" can now be accessed to the north of the starting location.
To easily gain experience, cast a healing or stat-boosting spell or ability on a character. If the affected character is at a higher level than the person who cast the spell or ability, they will gain 30 experience points.
Whenever your characters are grouped together, have one of them face away from your enemies. Generally speaking, the enemies that can make contact with the group will target the character with his or her back facing them, thus saving your other members from damage.