Warrior, Mage, Rogue.

Let's discuss our favorite commanders and, at the same time, our favorite heroes. For me, both are mages. At level 5, there are EXTREMELY powerful spells, a good summon, damage, and other joys of life, and a mage attacks in an area. You say it's a weak attack? Well, well. In my campaign, I had an archdevil adorned with artifacts like a Christmas tree; it dealt over 300 hit points per turn and moved at the very beginning. No one had time to react. Only those with immunity/resistance to fire survived to the second round, and even then, not always.
And, as a bonus, I play as a mage because I like the demon mage; he's handsome, has a beautiful voice, and attacks beautifully.