Etna mode:
To enter Entna’s secret chamber, at the title screen, highlight the “New Game” option, then press X, Y, B, X, Y, B, A. Alternately, beat the game after reading Etna’s entries in her secret chamber. To enter Etna’s secret chamber, press the two secret buttons in Laharl’s Castle. The first button is located behind the throne. The second button is located inside the skull on the counter in RosenQueen’s store. After both buttons are pressed, go to the room where Longinus, Ghoss, Stigma, and Gargo are found. Press A in the corner behind Stigma to reveal the door.
Unlockable characters:
Unlock the following characters by performing the corresponding tasks:
CHARACTER – HOW TO UNLOCK
Adell – Beat the “Demon Hall Mirror” stage in the Cave Of Ordeals six times.
Marjoly – Reach Rank 9 in the Dark Assembly, pass the “Mysterious Seal” bill, and complete all the stages.
Plenair – Beat the game, talk to Plenair, then choose the blank option
Priere – Reach Rank 8 in the Dark Assembly, pass the “Alternate Netherworld” bill, and complete all the stages.
Rozalin – Beat the “Demon Hall Mirror” stage in the Cave Of Ordeals seven times.
Zetta – Pass all the enemy bills, get Gordon into your party, then complete the first stage in “Stellar Graveyard” again.
Bonus classes:
Unlock the following classes by performing the corresponding tasks:
CLASS – HOW TO UNLOCK
Angel – Get a Female Cleric, Knight, and Archer all to level 100.
Archer – Get level 3 or higher in Bow Weapon Mastery.
EDF Soilder – Get level 30 or higher in Gun Weapon Mastery.
Galaxy Mage – Get a Prism Mage to level 50.
Galaxy Skull – Get a Prism Skull to level 50.
Knight – Get a Female Warrior and Female Mage both to level 10.
Majin – Get a Male Warrior, Brawler, Ninja, Rogue, and Scout all to level 200.
Ninja – Get a Male Fighter and Male Warrior both to level 10.
Prism Mage – Get a Star Mage to level 35.
Prism Skull – Get a Skull Mage to level 35.
Ronin – Get a Female Warrior and Female Fighter both to level 20.
Rune Knight – Get a Female Warrior and Female Magician both to level 10.
Samurai – Get a Female Warrior and Female Fighter both to level 20.
Scout – Get two Fighters or Warriors (male or female) both to level 5.
Star Mage – Get a Fire, Ice, and Wind Mage all to level 5.
Star Skull – Get a Fire, Ice, and Wind Skull all to level 5.
Strider – Get two Warriors or Fighters to level 5.
Thief – Get a Fighter and Warrior both to level 5.
Alternate endings:
Unlock the following alternate endings by performing the corresponding tasks:
ENDING – HOW TO UNLOCK
Dark Assembly – Force proposals in the Dark Assembly fifty times.
Etna Heroine – Get at least 100 ally kills before Chapter 5, Stage 4, then kill Maderas when prompted.
Flonne Tragedy – Get at least 50 ally kills before Chapter 3, Stage 4, then kill Hoggmeiser when prompted.
Good/Best – Beat the game without any ally kills.
Item God – Kill an Item God or Item God 2.
Midboss – Lose to the mid-Boss of Chapter 1, 4, 6, or 10.
Normal – Have at least one ally kill and do not fulfill the requirements for any other ending.
Overthrowing Earth – Pass the “Human World” proposal at the Dark Assembly, then complete the Human World stages.
Unlock the following alternate endings in Etna mode by performing the corresponding tasks:
ENDING – HOW TO UNLOCK
Beauty Tyrant Overlord Etna – Pass the proposal for Alternate Netherworld and The Mysterious Seal in the Dark Assembly, then defeat Priere, Marjoly, and Baal.
Normal – Beat the last chapter in Etna mode.
Prinny commentary:
To unlock the Prinny commentary, beat the game and then start a new game using your cleared saved game file.
Adell and Rozalin:
To get Adell and Rozalin from the second Disgaea on your team, first beat the Cave Of Ordeals to unlock the Demon Hall Mirror. Play this level five times and you will have to fight Adell at level 2,000. After defeating Adell, you will have to fight both Adell at level 2,000 and Rozalin at level 2,500 at the same time. They will join your party after you defeat them.
Plenair:
To get Plenair to join your party, lose to the mid-Boss and start a new game. Speak to Plenair, and do the Dark Assembly Tutorial. Speak to Plenair again. The option that appears above the “Exit” option will be blank. Highlight it and press A to make Plenair join your party at level 1.