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The Aitans of Lekaria come in 6 different forms with strengths, weaknesses, and different play styles.  They come in three categories and are locked to a specific gender.

Casters are Clerics and Warlocks.  Clerics are healers and are female, while Warlocks are male and deal damage in a variety of ways. Both can wear only cloth armors and have weak physical defense with strong magical resistance.
Scouts are ranged attackers with medium armor and stealthy abilities. They consist of Dual gunners, who are female, and Rifleman who are male.  Both are considered effective Damaging classes.
Melee armored classes are the Paladin and Warrior--these classes have high physical defense and low magical resistance.  Paladins are considered to be the tanks of the game, and are limited to being female, while warriors are brutal killing machines designed to be able to take a hit and provide their allies with bonus buffs via their shouts.