Successfully complete the indicated task to unlock the corresponding character 
class:

Berserker: Have a level 40 Heavy Knight and level 40 Monster Tamer. 
Cheerleader (Idol): Have a level 25 Geo Master and level 25 Healer. 
Female Archer: Have a level 15 Female Fighter and level 15 Female Healer. 
Female Ninja: Have a level 30 Female Monk and level 30 Female Magician. 
Female Samurai: Have a level 35 Female Fighter and level 35 Female Archer. 
Geo Master: Have a level 20 Fist Fighter and level 20 Healer. 
Gunner Female: Have a level 15 Female Thief and level 15 Mage. 
Gunner Male: Have a level 15 Thief and level 15 Male Mage. 
Heavy Knight: Have a level 15 Male Fighter and level 15 Fist Fighter. 
Magic Knight: Have a level 25 Fighter and level 25 Mage. 
Majin: Successfully complete the tutorial again on a cleared saved game file. 
Male Archer: Have a level 15 Male Fighter and level 15 Male Healer. 
Male Ninja: Have a level 30 Male Monk and level 30 Male Magician. 
Male Samurai: Have a level 35 Male Fighter and level 35 Male Archer. 
Masked Hero: Have a level 45 Thief and level 45 Gunner. 
Monster Tamer: Have a level 15 Female Fighter and level 15 Fist Fighter. 
Ninja Female: Have a level 30 Female Fist Fighter and level 30 Mage. 
Ninja Male: Have a level 30 Male Fist Fighter and level 30 Mage. 
Shaman: Have a level 25 Geo Master and level 25 Mage.