Classes

Barbarians - A ferocious warrior who uses fury and instinct to bring down foes.
Bard - A performer whose music works magic - a wanderer, a tale-teller, and a jack-of-all-trades.
Cleric - A master of divine magic and a capable warrior as well.
Druid - One who draws energy from the natural world to cast divine spells and gain strange magical powers.
Fighter - A warrior with exceptional combat capability and unequaled skill with weapons.
Monk - A martial artist whose unarmed strikes hit fast and hard - a master of exotic powers.
Paladin - A champion of justice and destroyer of evil, protected and strengthened by an array of divine powers.
Ranger - A cunning, skilled warrior of the wilderness.
Rogue - A tricky, skillful scout and spy who wins the battle by stealth rather than brute force.
Sorcerer - A spellcaster with inborn magical ability.
Vigilante - a warrior who resides in or around any particular town or village and protects the citizens from criminal acts.
Wizard - A potent spellcaster schooled in the arcane arts.
(Taken from Dungeons and Dragons, 3rd edition. Also note these can be mixed, for example, rouge fighter, fighter wizard, and so forth.)

Elementalists - Magicians who specialize on dealing with the four elements: fire, water, earth, and air.
Healer - Masters at the art of healing, well equipped with magical healing items and the means to examine patients.
High Thief - Gifted thief. It is said they can render themselves invisible. Concealment is one of their greatest skills.
High Ranger - Powerful outdoor warrior. They can locate people and objects in a practically supernatural manner.
Night Mystic Witch - Mysterious magic-wielder possessing supernatural powers. Their organization has their own secret tongue. They wield miraculous powers.
Woodland Bard - Musician and story-teller who has a strange rapport with nature.
(If you want a class I do not have listed here, please email me and describe the class.)

Dark Soldier - Regarded with both fear and awe. They have no regard for the lives of others.
Dark Mage - Very powerful and merciless. Regarded with both fear and awe.
Necromancer - Practitioners of the Dark Arts. Can animate the dead to use as slaves.
(Please note these are only 3 of the classes the characters will run into. Also, unless you plan on playing a villain, these should not considered as part of the class list to be chosen from.)