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I definitely like the Wizard; the Cleric is also good. And I always took the Goblin Warrior because of his large number of hit points. If you develop him correctly, he can aggro everyone. With two swords (on Grand difficulty), he hits harder than the Mages. Mages are needed to slow down and paralyze the enemy (for the Light faction) or (for the Dark faction) to deal massive damage, especially elemental damage; fire and air are preferable. If you develop each magic skill to 23, he can take down Robert the Wise in three turns. As for the Cleric, he's either a healer or a damage dealer.