There are seventeen bonus classes you can unlock in Disgaea 4: A Promise Unforgotten for the PS3.
Here is the list of bonus classes, and what must be done to unlock them.
Android – Beat the game with any ending that does not result in you losing a battle, then start a second playthough
Archer – Have a Healer and Valkyrie at Level 15, and pass the “Cute Huntress” bill
Armor Knight – Have a Warrior at Level 20, and pass a bill in the Dark Senate
Battle Suit – Have a Warrior and Armor Knight at Level 30, and complete Episode 8
Beast Master – Have a Warrior and Valkyrie at Level 15, and pass the “Top Breeder” bill
Bouncer – Complete Episode 7
Gunner – Have a Thief and Skull at Level 15, and pass the “Sunset Kind Of Guy” bill
Lady Samurai – Have a Valkyire and Archer at Level 30
Magic Knight – Have a Warrior or Valkyrie, and Skull or Witch at Level 30, and pass a bill in the Dark Senate
Masked Hero – Have a Thief and Warrior at Level 25, and pass the “Hero Of The Future” bill
Ninja – Have a Thief and Skull at Level 30, and pass a bill in the Dark Senate
Onmyo Monk – Have a Sorcerer and Ninja at Level 30, and pass the “Feng Shui Specialist” bill
Professor – Have a Healer and Onmyo Monk at Level 20, and pass a bill in the Dark Senate
Samurai – Have an Archer and Valkyrie at Level 30, and pass a bill in the Dark Senate
Sorcerer – Have a Skull and Witch at Level 15, and pass the “Curse Loving Girl” bill
Star Mage – Have a total level of 50 between all of your Red, Blue, and Green Witches
Star Skull – Have a total level of 50 between all of your Red, Blue, and Green Skulls
