Unlimited Blue Fruits
Play as Sharline. Whn you first start, grab the bow and pot lid and head down to the save crystal. Kill the Flower which will drop a blue fruit 100% of the time. After you get the blue fruit enter the shop through the crystal and exit. The Flower will be back and will still drop a blue fruit.
Unlimited Red Fruits in Underground Temple
After Castle Rieubane, you go to an Underground Temple. In the East Annex Wing, there is a Golem that drops endless Red fruits that gives your stuff +10 stats. Just go back to the save crystal, and it will be there again!
Character and Story Menu
To unlock the Characters menu you need to have collected every single enemy files. The profiles really help you a little bit with the confusing story a bit. For the Story menu, you need to have collected every single item in the game. (weapons, armor, e.t.c).