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For ease of comparison, there are pictures of each character below, along with a short description of each character. More in depth information on the skills and traits of each class can be found in the wiki links before each description.
Barbarian: A melee battler who relies on heavy armor and brute force to avenge the destruction of the Worldstone and sacred Mount Arreat. Even though the Barbarian is returning from Diablo II, many skills have been added for Diablo III, such as Ground Stomp and Hammer of the Ancients, which are mixed in with more familiar skills including Whirlwind and Leap Attack. Despite many changes, the overall playstyle of the Barbarian in Diablo III should be similar to the previous incarnation. Barbarians utilize Fury, which builds up when dealing and recieving damage, as their resource. Some of the Barbarian's skills cost no Fury, and others, such as War Cry, build up Fury for early on in combat.
Demon Hunter: Quick ranged attackers who thirst for vengeance against the monsters who destroyed their towns and families. A Demon Hunter relies on quick movement through Vault to create distance between themselves and advancing demons, while also utilizing traps to create chokepoints and ranged attacks to slow and damage enemies. The Demon Hunter features returning Amazon skills, currently limited to Multishot, although more Amazon skills could be introduced in some form. The Demon Hunter's resource system is currently under development, but it appears as though they may use two different pools. Hatred is a quickly regenerating resource used for low cost and burst damage skills, while Discipline is a slowly regenerating resource used for more strategic skills and gadgets.
Monk: Fast, combo-based melee fighters who spend much of his life honing their bodies to be an instrument of their one thousand and one gods. The Monk features a combination of holy and martial arts skills, along the lines of Seven Sided Strike, while also adopting the Paladin's auras. Not much is known about these auras other than the fact that they are part of the Monk's skillset, and short descriptions can be found in the wiki link above. The Monk also features some hybrid healing and attacking skills, which could prove invaluable if there is a lack of Health Globes in a tough situation. Monks use Spirit as their resource, which builds up when the Monk uses any of their three step combo skills and is consumed when using signature moves similar to Breath of Heaven or Wave of Light.
Witch Doctor: A voodoo spellcaster who hails from the Tribe of the Five Hills of the Torajan jungles in southern Sanctuary. Witch Doctors can use a variety of mid ranged spells such as Firebomb or Locust Swarm along with their pet Zombie Dogs or Gargantuans. The Witch Doctor also has a wide range of summon-based attack spells along the lines of Plague of Toads and Wall of Zombies, which summon minions for a short period of time to deal damage. Witch Doctors use Mana as their resource, which functions the same as in Diablo II.
Wizard: Supremely confident masters of the magical arts working towards personal gain and reputation. The Wizard is a long ranged attacker that has a wide range of skills based around Arcane, Lightning, Cold and Fire damage. The Wizard features versions of many different Sorceress skills, such as Meteor, Hydra and Teleport. The Wizard also has control over a few ray based skills, namely Ray of Frost and Disintegrate which can be used to devestating effect. Wizards also seem to have a few melee based and armor skills; Diamond Skin and Spectral Blades among others, which opens up the possibility of Battle Mages who get up close and personal with the minions of the Burning Hells. Wizards use Arcane Power as their resource, which is fast regenerating and capped at 100 but is otherwise similar to Mana. 
Edited by Jackzor, 10 March 2011 - 01:09 AM.
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