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You get Paladin class in AQWorlds from Artix in Swordhaven (he is found in the inn).
you get defender class is menber only
You have to link your Dragonfable Dragon Amulet account to your AQWorlds account.
You can't exactly be a Guardian on AQWorlds, but you can verify on AQW that you have Guardian on the original Adventure Quest and get Guardian class in AQWorlds. :)
No class is located in Oshii's shop at the Thanksgiving event.