Fighter: I'm a war mage who conjures arcane armor and swords, then attacks
Wizard: I'm a mundane alchemist guy who throws bottles of potions for various effects.
Rogue: I'm a shadow-magic user who uses his shadow to sneak around, help me steal things, pick locks and help me perform various feats of acrobatics
Paladin: I'm a guy who uses lost nanotechnology to repair other people on the cellular level while fighting with power armor.
Ranger: I'm a guy with a six-shooter and a steampunk robo-dog.
Psion: I use technology to hack reality
Druid: I am guy who knows demonic magic, and can turn into a demon.
thats all I can come up with now.