Makai Senki Disgaea: Makai No Ouji to Akai Tsuki Cheats (Nintendo DS)

At the title screen, highlight the "New Game" option, then press X, Y, B, X, Y, B, A. If
you entered the code correctly, you will hear Etna's voice. Alternately, successfully
complete 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
behind the throne. The second button is 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 usually found. Press A in the corner behind Stigma to reveal the door.

Successfully complete the game, then start a new session using your cleared saved game
file. Speak to Plenair, and go through the Dark Assembly Tutorial. Speak to her again.
When your options appear, there will be a blank space above the "Exit" option. Press A on
it, and Plenair will say something similar to "They've found me..." and automatically join
your party at level 1. She has incredible speed, uses guns as her main weapon, and already
has the Nether 35 and an Imperial Seal equipped. Her first special attack is Usagi Drop,
which is just about the same as Prinny Barrage but with bunnies.

Successfully complete the game, then start a new session using your cleared saved game
file.

Successfully complete the indicated task to unlock the corresponding ending:

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: Successfully complete 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.

Successfully complete the indicated task to unlock the corresponding ending in Etna mode:

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: Successfully complete the last chapter in Etna mode.

Successfully complete the indicated task to unlock the corresponding class:

Angel: Get a Female Cleric, Knight, and Archer all to level 100 or higher.

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 or higher.

Majin: Get a Male Warrior, Brawler, Ninja, Rogue, and Scout all to level 200 or higher.

Ninja: Get a Male Fighter and Male Warrior both to level 10 or higher.

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 or higher.

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 or higher.

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.