Mine are/were:
Goodwin - Fighter, Ninja. The Fighter Techs were just awesome and then the Ninja Techs (or were they skills?) could inflict status ailments. Throw a sword in both hands and you have a force to be reckoned with.
Major - Gladiator, Dragoon. It seemed like the Gladiator Techs were blocked all the time with me but when I could use them I loved them. The Dragoon Techs also came in really handy when fighting Dragons, and other characters.
Eldena - White Mage, Red Mage. Magic Power Plus + Doublecast + Curaga = Awesome.