Fighters are unique in that they dont necissarily come from a particular legend or source, like Druids or Bards. A fighter is... a fighter, someone who fights. The whole of human history we could draw inspiration from has fought. Like a menu with far too many options, the choices of what to inspire you when creating a fighter can be so many, it's paralyzing. It's no wonder we end up making so many people that hit stuff with a sword, as opposed to characters we find compelling and unique.