Each of these builds will be much stronger with added padding of the Fighter's starting skill lines. Three great options are to add Necromancer for a similar build to the Inquisitor, Pyrokinetic for a similar build to the Wizard, or Polymorph for a similar build to the Shadowblade.
Outside of the main two skill lines, just about any skill line can be added to this class. Like most other classes in this game, the Fighter can be very flexible with other added skill lines.
