- Napoleon Dynamite reference
In Axel mode, Axel will learn a move called Love Dynamite, and the description reads 'I voted for Pedro'. Pedro was Napoleon's friend who was running for class president.

- Axel (Akutare) mode
At the main menu, highlight the 'New Game' option, then push Triangle, Square, O, Triangle, Square, O, X to unlock Axel (Akutare) mode. In the Japanese version, highlight the 'New Game' option at the main menu, then push Triangle, Square, X, Triangle, Square, X, O.

- Bonus characters
Successfully complete the indicated task to unlock the corresponding character:

Prism Red	Pass the five Prism Rangers bills when Adell is a Sentator, then pass his bill a second time.
Asagi	Unlock Asagi's map with 33 felonies, 100 mana, then defeat her, and pass her bill as a senator in a New Game+.
Marjoly	Unlock Extra Stage 7 with 99 felones and 1,500 mana. Overcome Marjoly, then pass her bill.
Vyers (Mid-Boss)	Unlock Extra Stage 5 with 20 hours of game play time and 400 mana. Successfully complete Vyers' stage in Episode 1-9. Reach the stage again during the next playthrough, and pass his bill.
Laharl	Unlock Flonne, then pass Flonne's bill as a senator, and successfully complete Extra Stage 9.
Gordon	Unlock Extra Stage 4, and pass Gordon's bill after completing it.
Preire	Unlock Extra Stage 6 with 66 felonies and 100 mana. Then, defeat Priere during Episode 1-9, and pass her bill.
Raspberyl	Unlock Raspberyl's stage after completing thirty Dark Sun stages and unlocking Mr. Champloo.
Sabre Kitties	Successfully complete Axel mode 1-2.
Mao	Unlock Mao's stage after unlocking Champloo, Raspberyl, and the Land Of Carnage.
Mr. Champloo	Unlock Mr. Champloo's stage with 50 hours or more of game play time and completing Axel mode.
Flonne	Unlock Extra Stage 8 with 40 hours or more of game play time. Then during Episodes 12-13, defeat Flonne.
Asagi (humanoid)	Raise Asagi's level to 2,000, and pass her bill as a senator.
Zetta	Unlock Extra Stage 11 with ten Dark Sun stages completed and 3,000 mana. Successfully complete the map, then pass Zetta's bill.

- The Lord Of The Rings reference
The Elven Bow's description states that it was used by an elf in a quest to destroy a ring. The elf mentioned was Legolas, and the ring mentioned was the One Ring.

- Alternate endings
Successfully complete the indicated task to unlock the corresponding ending sequence:

Etna	Overcome Etna in Chapter 3.
Tink	Overcome the Final Boss with level 1,000 Tink.
Axel (Akutare)	Get defeated by Axel (Akutare).
Laharl	Overcome Laharl in Chapter 11.
Middle Boss	Overcome the Mid-Boss before Chapter 4.
Bad	Have Adell get 10+ felonies and kill an ally 50+ times.
Worst	Have Adell get 99+ felonies, kill an ally 99+ times, and Rozalin (Rossary) ally-killed by Adell.

- Bonus classes
Successfully complete the indicated task to unlock the corresponding class:

Magic Knight	Reach level 3 Sword and Staff Mastery with any character.
Archer	Reach level 5 Bow Mastery with any character.
Female Ninja	Reach level 5 Fist and Staff Mastery with any character.
Samurai	Reach level 5 Sword Mastery with any character.
Gunner	Reach level 5 Gun Mastery with any character.
Chaos Soldier	Successfully complete the game.
Druid	Execute a 500+ Geo combo.
Heavy Knight	Reach level 3 Spear Mastery with any character.
Male Ninja	Reach level 5 Fist and Sword Mastery with any character.
Mass Produced Kurtis	Successfully complete Extra Stage 4.
Disgaea Ronin	Have a saved game file from Disgaea
Female Samurai	Have a saved game file from Disgaea
Entei Monster Class	Successfully complete Axel mode 2-3.
Beast Tamer	Capture a monster.
Celestial Host	Successfully complete Axel mode 3-3.
Sinner	Become a criminal with any character.

- Land Of Carnage
Acquire all 16 Treasure Maps from the pirates in Item World to unlock Land Of Carnage, which is a world that features all normal levels with very strong enemies.

- Infinite Magichange turns
Throw a character back in the base panel to get unlimited turns for Magichange.

- Magichange
Successfully complete Axel mode, then begin a new game session in Adell mode to unlock Magichange.