The fighter is a well-rounded warrior who is able to take defensive and offensive roles, as well as the role of tactician and group leader.  Able to use a great variety of different types of gear, he excels in his versatility as well his ability to lead using his excellent knowledge of combat strategy.

A notable fighter would be Kitiara.

In-Game Help File:

Warriors are known to have more strength than the average person.  This makes them better at hand-to-hand combat, as they possess skills of violence and fighting unequaled by the members of any other class.  However, they lack the ability to use magic of any sort.  However, as they often have had need to use versatility and resourcefulness in their travels, fighters will use virtually any item they come across.  Warriors must possess at least an average strength for the use of the heavy weapons and armor that are commonly used in combat.