The Hunter is version of the Rogue or Thief. Their armour to cloth ratio is 50:50. They are specialists at stealth and long range fighting, but are just as leathal with their blade. They were once outlaws, prowling in the wilderness and wastelands. Now, bending the rules and being as 'resourceful' as they are comes in handy.
Unique Features:
The Hunter wields a combat knife for quiet, close-quarter kills.
The Titan class is the walking tank. It is Bungie's Sci-Fi Warrior or Barbarian. They have a 80:20 armour to cloth ratio and specialize in heavy weapons as well as light machine guns. They were the ones who built the Wall and they were the ones who gave their lives to hold it during the Collapse of the Golden Age. They are forged from strength and sacrifice, being as merciless as their enemies.
The Warlock is your classic Mage, but with a Bungie twist. They can use weapons as well as magic, making it so you can master both without being weaker that the other classes. They have a 20:80 armour cloth ratio.
By studying the Traveler and learning to control some of its magical energies, the Warlocks came to be. While the true purpose of the Traveler and its abilities, including the ones granted to you, remain a mystery, discovering the truth has always driven you into the unknown.
http://www.ign.com/wikis/destiny/Classes