Monk...Ninja... They all sound good, but indeed an all-ability mastered calculator combined with all of the Time Magic, Black Magic, White Magic and Yin Yang Magic can already easily manipulate the field. I murdered WEIGRAF, GAFFY, MELIADOUL and ALL OF THE ZODIAC PUNKS with just a squire Ramza with MATH SKILL, magic attack UP, MP Switch, and Move MP-UP. And don't get me started on Holy Swordsman.

But if you put Chantage on either Meliadoul or Agrais, you'll murder Dycedarg, Weigref, and even Vormav!
(but none are as superior as a Calculator, or a high speed class with Math Skill.)