Elves in Mystara developed their first civilization upon their skills with magic and combat. Elves learn magic easily and all elves know at least some magic. As a result, nearly all elves on Mystara are multi-class fighters and magic-users. To play a character that is not some form of fighter/magic-user*, consult your DM.
Additionally, when Illsundal became an Immortal, he was able to grant clerical magic to elves who followed his way. Yet, instead of creating a separate class, he used his power to expand upon the native elven magic skills of those who followed his way. His priests are both magic users and clerics and are known as Treekeepers. For more info on playing the specialty Treekeeper class, also consult your DM.
*Note: Class names have been simplified to accommodate various versions of D&D rules. The general class name "fighter" refers to all related classes of fighters (i.e. ranger. barbarian, etc.) "Magic-users" refers to all arcane spellcasters (wizards, sorcerors, etc.) "Cleric" refers to all classes that emphasize divine spellcasting (priests, druids, monks, etc.) "Rogue" refers to thieves/rogues and other related classes (assassin, bard, etc.)
When appropriate for a particular area of Mystara, more specific classes (i.e. paladin, merchant, druid, etc.) may be listed with further details available for classes in that nation of origin. For example, barbarians are a common class born to the Northern Reaches, and, therefore, details on barbarians in Northern Reaches are provided.
If a particular character class for the region is not listed, it is probable that the class is uncommon for that region, or that the background necessary for playing such a class is beyond the scope of this character generator. Consult you dungeon master for further information on playing the desired class.