Character Job Classes - Gain job levels in the following classes to unlock more advanced ones.

Archer Level 2 Squire
Arithmetician Level 5 White Mage, level 5 Black Mage, level 4 Mystic and level 4 Time Mage.

Bard Level 5 Summoner and level 5 Orator (Male only)
Black Mage Level 2 Chemist

Dancer Level 5 Dragoon and level 5 Geomancer (Female only)
Dark Knight Completely Master Knight and Black Mage, kill (crystallize) 20 units, and reach level 8 with Dragoon, Ninja, Goemancer and Samurai
Dragoon Level 4 Thief

Geomancer Level 4 Monk

Knight Level 2 Squire

Mime Level 8 Squire and Chemist, level 5 Geomancer, Dragoon, Orator, and Summoner.
Monk Level 3 Knight
Mystic Level 3 White Mage

Ninja Level 5 Thief, level 4 Archer, level 2 Geomancer

Onion Knight Level 6 Squire and level 6 Chemist
Orator Level 3 Mystic

Samurai Level 5 Monk, level 4 Knight, level 2 Dragoon
Summoner Level 3 Time Mage

Thief Level 3 Archer
Time Mage Level 3 Black Mage

White Mage Level 2 Chemist

Unlocking the secret characters - There are five secret characters that can be attained in the game, six if you count the two forms of Reis. The following list shows how to get them all. NOTE: You must have Mustadio in your party to get all of the secret characters, and all of these characters are aquired in Chapter 4.

Unlockable How to Unlock

Beowulf Read the rumors at Goland, go to Lesalia, then agree to accompany Beowulf to Goland. After a series of plot battles, he joins the party.
Biblos Aquired after clearing all ten levels of the Deep Dungeon.

Cloud After returning Reis to human form, go to Goug. Cloud will run off to Zarghidas after a scene. After clearing Igros, go to Zargidas and win the fight.
Construct 8 After rescuing Reis from Goland, return to Goug Machine City. Worker 8 joins the party after a small scene.

Dragon Reis Accompany Beowulf through Goland Coal City; Reis is rescued during the final battle in the series.

Human Reis Read the rumors at Zeltennia, buy a flower in Zarghidas, then return to Goug. This unlocks a battle in Zeltennia, and Reis takes human form afterward.