Unlock Bonus Characters: When prompted when you are loading a new game load a Suikoden 4 saved game file with 108 stars. This alters dialog in the game and enables two additional Suikoden 4 related characters (Hero IV and Snowe) to be unlocked.
Unlock New Game+: Complete the game and save when prompted. Then load your cleared game file to start with ALL your previously earned money, items, equipment and skills from your first playthrough. This does not include Runes.
Skip Cut Scenes: Complete the game once and when you play any subsequent games press 'Start' to skip the cutscenes.