Disgaea : Afternoon of Darkness - Cheats:

Etna Mode
- There is a hidden mode in Disgaea Portable called Etna mode. Normally you have to get this mode by going through the game and reading Etna's diary every chapter, but you can unlock it instantly by entering the following code during the title screen, with the pointer on "New Game." If you're successful, you'll hear Etna's voice.

Effect : Cheat
Etna Mode (JP) : Triangle, Square, X, Triangle Square, X, Circle
Etna Mode (US) : Triangle, Square, Circle, Triangle Square, Circle, X

Unlockable
Extra Classes
Unlockable : How to Unlock
Angel : Female Cleric, Knight and Archer all at level 100 or higher.
Archer : Level 3 or higher in Bow Weapon Mastery.
EDF Soilder : Level 30 or higher Gun Weapon Mastery.
Galaxy Mage : Level a Prism Mage to Level 50.
Galaxy Skull : Level a Prism Skull to Level 50.
Knight : Female Warrior and Female Mage each at level 10 or higher
Majin : Male Warrior, Brawler, Ninja, Rogue and Scout all at level 200 or higher.
Ninja : Male Fighter and Male Warrior with a total level of 10 or higher.
Prism Mage : Level a Star Mage to Level 35.
Prism Skull : Level a Star Skull to Level 35.
Rogue : Both Fighter and Warrior, Males or Females, each at level 5 or higher.
Ronin : Female Warrior and Female Fighter with a total level of 10 or higher.
Scout : 2 Fighters/Warriors, Males or Females, each at level 5 or higher.
Star Mage : Get 1 Fire,Ice and Wind Mage and level all 3 of them to level 5.
Star Skull : Get 1 Fire,Ice and Wind Skull and level all 3 of them to level 5.
Strider : 2 warriors/fighters both lvl 5 or higher
Rune Knight : Female warrior and female magician both lvl 10
Samurai : Total lvl of 20 with female warrior and female fighter
Thief : Fighter and warrior both lvl 5

Endings
- Multiple Endings can be achieved by doing one of the following:
Unlockable : How to Unlock
Good Ending : Beat the game without killing allies
Bad Ending : Defeat the Item God on the 100th floor of a legendary item.
Dark Assembly : Persuade by Force 100 times in the Dark Assembly
Etna Heroine : Kill 100 or more allies before Episode 5's Ice Queen Battle then choose to kill Maderas.
Flonne Tradegy : Kill 50 or more allies before Episode 3 and the Lavish Hall battle. Choose to Kill Hoggmeiser.
Overthrow Earth : Clear human world
Midboss Ending! : Lose to Midboss in your first encounter with him.


Endings for Etna mode
- Disgaea: Afternoon of Darkness includes the Etna mode, which is basically a twist to the story and features Etna as the main character. Below are several endings that can be unlocked in Etna mode.

Unlockable : How to Unlock
Normal/Default Ending : Beat the story normally by finishing the last chapter in Etna mode.
Beauty Tyrant Overlord Etna Ending : Pass the proposal for Alternate Netherworld and The Mysterious Seal in the Dark Assembly, then move on by defeating Priere, Marjoly and lastly Baal.