DS
Unlockable Secret Characters
Adell - Beat "Demon Hall Mirror" stage, in the Cave of Ordeals, 6 times
Marjoly - Get rank 9 in the dark assembly, pass the bill "Misterious Seal", and beat all the stages
Plenair - After you beat the game, talk to Plenair, and choose the blank option
Priere - Get rank 8 in the dark assembly, pass the bill "Altermate Netherworld", and beat all the stages
Rozalin - Beat "Demon Hall Mirror" stage, in the Cave of Ordeals, 7 times
Zetta - Pass all the enemy bills, then after you get Gordon into your party, beat the first stage in "Stellar Graveyard" again
Submitted By Happy Nappy
DS
Etna Mode Endings
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.
Normal/Default Ending - Beat the story normally by finishing the last chapter in Etna mode.
Submitted By zoidberg
DS
Normal Mode Endings
Dark Assembly Ending - Force proposals in the Dark Assembly 50 times, then finish the game normally.
Etna Heroine Ending - Get at least 100 ally kills before Chapter 5, Stage 4, then choose to kill Maderas when prompted.
Flonne Tragedy Ending - Get at least 50 ally kills before Chapter 3, Stage 4, then choose to kill Hoggmeiser when prompted.
Good/Best Ending - Complete the game without a single ally kill.
Item God Ending - Kill an Item God or Item God 2, then finish the game.
Midboss Ending - Lose to Midboss in Chapter 1, 4, 6 or 10.
Normal Ending - Finish the game with at least 1 ally kill, and do not fulfil requirements for the 7 other endings.
Overthrowing Earth Ending - Pass the "Human World" proposal at the Dark Assembly, then complete the Human World stages.
Submitted By zoidberg
DS
New Game + Etna Mode
Unlocking Etna Mode via New Game + - Check out all her entries in her secret chamber before the last chapter and you'll be given the option to do Etna Mode in New Game +
Submitted By zoidberg
DS
Unlockable Classes
Angel - Female Cleric, Knight and Archer all at level 100 or higher.
Archer - Level 3 or higher in Bow Weapon Mastery.
EDF Soldier - 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 each at level 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 each at level 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.
Thief - Fighter and warrior both lvl 5
Submitted By Warren Spector
DS
Etna Mode
Unlocking Etna Mode via New Game + - Check out all her entries in her secret chamber before the last chapter and you'll be given the option to do Etna Mode in New Game +.
Submitted By Warren Spector
DS
Unlocking Etna's Chamber
Unlocking Etna's Chamber - Push the button behind the throne, and another in the skull beside the weapon shop, and check the wall behind the Prinny in the same room as Longinus.
Submitted By Warren Zevon