Complete the indicated task to unlock the character.

Character	How to unlock
Asagi (Humanoid)	Raise Asagi's level to 2000 and pass her bill as a senator.
Asagi	Unlock her map with 33 Felonies, 100 mana, and at any time after the first playthrough, defeat her and pass her bill as a Senator.
Celestial Host	Clear Akutare mode 3-3 and they will be available to create.
Disgaea Ronin	Have a Disgaea 1 save file. (Regions must match)
Entei Monster Class	Beat Akutare Mode 2-3 and they will be available to create.
Flonne	Unlock ES8 with 40 hours game time and during Episodes 12-13. Defeat her and she'll join.
Gordon	Unlock Extra Stage 4, and pass his bill after completing it.
Laharl	After obtaining Flonne, pass Flonne's bill as a Senator and beat ES9.
Mao	Unlock his stage after obtaining Champloo and Raspberyl.
Marjoly	Unlock ES7 with 99 Felones, 1500 mana and at any time and defeat her. After, pass her bill.
Mass Produced Kurtis	Beat Extra Stage 4 and you will be able to create them.
Mr Champloo	Unlock his stage with 50 hours game time and Akutare mode clear.
Preire	Unlock ES6 with 66 Felonies, 100 mana and during Episode 1-9 and defeat her. After, pass her bill.
Raspberyl	Unlock her stage after clearing 30 Dark Sun Stages and obtaining Champloo.
Sabre Kitties	Unlocked after clearing Akutare Mode 1-2.
Vyers/Midboss	Unlock ES5 with 20 hours of Game time, 400 mana and in Episode 1-9 and beat his stage. On the next playthrough, get the stage again and pass his bill.
Zetta	Unlock ES11 with 10 Dark Sun Maps cleared and 3000 mana. Clear the map and pass his bill afterwards.