Asmor said:This site has a lot of good information on party roles that's applicable to D&D.
Asmor said:I was being tongue in cheek, but if it helps you... Cool. (That page is for the World of Warcraft MMORPG, and it's a recurring joke on this board that D&D is trying to be more like WoW).
Asmor said:Anyways, for a more serious answer, D&D (3rd edition, at least, 4th edition is specifically monkeying with this stuff) isn't really based on party roles, although there are 4 basic roles a well-balanced party should have:
A fighter. Basically, they're the muscle that stands in front and tries to engage enemies before the enemies can engage the glass-jaws. Typically does moderate, but reliable, damage and has the best defenses.
An arcane magic user. To provide support and firepower. Excellent damage capabilities and environmental control. For most intents and purposes, no defense at all.
A divine magic user. To provide buffs and healing. With magic, can usually do as much damage as a fighter, and has the second best defenses. However, in combat is actions are usually spent helping allies, not fighting.
A rogue. Primary role is to take care of all the non-combat encounters; can also dish out a lot of damage with a little skill and teamwork, thanks to sneak attack. Good, but unreliable, damage; good defense.
Asmor said:The classes you listed seem to be based off of the d20 Modern starting classes, which are in turn each based around a particular stat.
Powerhouse = Strong Hero = Strength
Speed Freak = Fast Hero = Dexterity
Tank = Tough Hero = Constitution
Brainiac = Smart Hero = Intelligence
Empath = Dedicated Hero = Wisdom
Star = Charismatic Hero = Charisma
Asmor said:These aren't really party roles so much as they are focuses for the character. For example, Powerhouses and Tanks could both probably fill the "fighter" role, and an Empath or Brainiac who was an EMT/Doctor/etc could fill the role of the "divile magic user," but there's really no equivalent to an arcane magic user in a modern setting, at least not without adding a bit of supernatural stuff.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.