In FINAL FANTASY XI, you create your own character by selecting your race, job, gender, face, and body size.
The combinations are unlimited.
There are five races (Hume, Elvaan, Tarutaru, Mithra, Galka) and six initial jobs (warrior, thief, monk, white mage, black mage, and red mage) to choose from. Many other jobs exist as well.
You can change your job any time, and eventually gain the ability to select a support job. With a support job, you can effectively "hold two jobs at once." Want to be a warrior who can cast white magic? How about a monk with black magic? With support jobs, the combinations are endless!
As your adventures progress, you may find that new jobs become available. Why not try your hand at learning the ways of the bard, ranger, or beastmaster?