At the main menu, highlight start and press XYBXYBA and you should here Etna speak, meaning you entered the code right.
Shadow of Death's note: This code will unlock the option to play a weaker version of Etna Mode, selectable from the main menu, but would require a new game.
In order to unlock the additional 15 fighter classes you must have a:
|Unlockable||How to unlock|
|Angel||Female Cleric (Lv 100+), Knight (Lv 100+), Archer (Lv 100+)|
|Archer||Character with Bow Weapon Mastery (Lv 3+)|
|EDF Soldier||Character with Gun Weapon Mastery (Lv 30+)|
|Galaxy Mage||Prism Mage (Lv 50+)|
|Galaxy Skull||Prism Skull (Lv 50+)|
|Knight||Female Warrior (Lv 10+), Female Mage (Lv 10+)|
|Majin||Male Warrior (Lv 200+), Brawler (Lv 200+), Ninja (Lv 200+), Scout (Lv 200+), Thief (Lv 200+)|
|Ninja||Male Warrior and Male Brawler with a combined level of 10+|
|Prism Mage||Star Mage (Lv 35+)|
|Prism Skull||Star Skull (Lv 35+)|
|Ronin||Female Warrior and Female Brawler with a combined level of 10+|
|Scout||2 Brawlers, or 2 Warriors, or 1 Brawler and 1 Warrior. Both at level 5+|
|Star Mage||Fire Mage (Lv 5+), Ice Mage (Lv 5+), Wind Mage (Lv 5+)|
|Star Skull||Fire Skull (Lv 5+), Ice Skull (Lv 5+), Wind Skull (Lv 5+)|
|Thief/Rogue||Brawler (Lv 5+), Warrior (Lv 5+)|
Just throw the hostile senators onto a higher level friendly senator. The hostile senator will now be part of the friendly senator. Rinse and repeat until the bill is passed.
Press the switch behind the throne and the skull on the shop counter. Go to the room where the music vendor is. Examine the wall behind the prinny and read Etna's diary there. Read each entry for every episode, and you will be able to play as Etna in New Game +.
Note: This will not work if you miss an entry on the episode it was written. So remember to check up on her diary for every episode.
After you've passed 20 stronger enemy bills and talked to the gatekeeper, which unlocks the stage Zetta is on, you can then pass 20 weaker enemy bills and fight a level 3200 Zetta instead of a level 9999 one.