The sorceror can do insane damage. Give him the ability to wield a sword in two hands and he can do over 3k damage if his target has elemental weakness. Have another character cast Haste on him and anythign that stands before him will be demolished.

A great support character is a White Mage/Time Mage. (Or a Time Mage/White Mage) Once she casts Haste on herself, one white mage can typically keep an entire team going by herself unless the boss is really dishing out damage.