Warrior – equipped with a large sword/blunt weapon, experts in combat, big on attacking but not defense
Zodiac – astrologers that collect “ether” from the sky, and use it for star arts/techniques
Ballista - missile experts, nicknamed “Marksmen”, good with longbows and body-sized canons
Beastking – can communicate with beasts, can control demons to fight alongside your party
Farmer – good exploration skills, weak in combat
Read more from the original source:
Etrian Odyssey III – more classes revealed, detailed