Disgaea DS Codes -

Etna mode:
Highlight the "New Game" option at the opening menu, then press , , , , , , . Etna's voice will confirm correct code entry.

 Prinny commentary:
Complete the game and start a new session using your cleared saved game file.

Hidden classes:
Complete the indicated task to unlock the corresponding class.

Angel: Get a female Cleric, Knight and Archer to level 100. 
Archer: Get to level 3 or higher in Bow Weapon Mastery. 
EDF Soldier: Get to level 30 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 to level 10. 
Majin: Get a male Warrior, Brawler, Ninja, Rogue and Scout to level 200. 
Ninja: Get a male Fighter and male Warrior to level 10 or higher. 
Prism Mage: Get a Star Mage to level 35. 
Prism Skull: Get a Star Skull to level 35. 
Rogue: Get a Fighter and Warrior to level 5. This information has been reported as inaccurate. Please notify us of any corrections or verifications. 
Ronin: Get a female Warrior and Fighter to level 10. 

Scout: Get two Fighters or two Warriors to level 5. 
Star Mage: Get a Fire, Ice, and Wind Mage to level 5. 
Star Skull: Get a Fire, Ice, and Wind Skull to level 5. 
Thief: Get a Fighter and Warrior to level 5. 

Alternate endings:
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 : 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. 

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 finally Baal. 
Normal: Complete the last chapter in Etna mode.