Clear the game and save the completed file. When you load the game, you will now be able to play as the guest characters that joined you during the game such as Kee Keema, Meena, Wataru, Mitsuru, and Kutz.

Enemy details
Clear the game and save the completed file. When you load the game, you will now be able to view more details on all the game's enemies by view the Monster Album in the Other menu. Highlight any monster and press X to view their details, including how to craze them.