I've seen almost all classes in Rouman (its easy to recognize them by clothing) but I think the most popular class is the archer class but maybe that's just me.
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Fiesta Info - Elderoth - Noob Mage (Hasn't hit double digits yet)
Clerics are the best overall at lower levels, but us Archers are going to slaughter you all when PvP comes out! If you havn't realized I'm going to mainly do PvP xD