Unlock Choco 
     Beat the 30-round arena trial in Rueloon with Darc's party.
 
Unlock Diekbeck 
     Beat the 20-round arena trial in Cathena with Kharg's party.
 
Unlock New Game+ 
     Complete the game and you'll unlock the option New Game+. This
option lets you begin the game as Kharg with the following items in
his possession: King Statuette, 3 Diamond coatings, 999 Spririt
Stones, 10 Bountiful Fruit, 50 Dilzweld Bombs, and 100,000 Gold.