Heroes in Heroes of Might and Magic V: graphics, biographies, skills...

The hero is implemented similarly to the classic Heroes 3, but with one exception. He can attack enemies (instead of just casting spells) while remaining invulnerable.
Human heroes attack with Holy Charge, charging into the enemy ranks at high speed and dealing significant damage. They also cast Prayer for free.
Inferno heroes charge into the enemy ranks and deal damage. They also have a combat skill (some kind of strike, but I didn't pay much attention to it).
Academy heroes use a weak attack, but they can also recycle their creations' Mini-Artifacts into mana. They have the Magic Mirror ability for free on all their creations.
Necromancer heroes use Dark Scream (an anti-Prayer spell) and can restore mana by dealing damage to the enemy.
Sylvan heroes shoot at enemies with bows, and they have an excellent arsenal.
Underground Lords are useless in combat, but they deal a little damage (they are better used for one purpose - to cast empowered spells).
Haven and Sylvan are truly effective combat heroes. The others have some abilities, but their main role is to cast spells.