Do the task and get the corresponding extra classes!
Chaos Soldier: complete the game one time
Female Ninja: get someone to level 5 fist and staff mastery
Heavy Knight: get someone to level 3 spear mastery
Magic Knight: get someone to level 3 sword and staff mastery
Male Ninja: get someone to level 5 fist and sword mastery
Gunner: get someone to level 5 gun mastery
Archer: get someone to level 5 bow mastery
Beast Tamer: capture a monster
Samurai: get someone to level 5 sword mastery
Wiseman: destroy 500 Geo Panels
Sinner: One of your party members becomes a criminal