Since planeshift has no classes we can all make up our own ones. Here are a couple non-traditional classes I have thought of:
Mage Slayer:
A class dedicated to the destruction of all magic, or at least to the killing of mage enemies of his or her guild. Antimagic is of course very important, and then something to kill with. Melee Skills, Assasin Skills, Ranged Skills or maybe even offensive magic.
Spy:
Self explanatory. Very good stealth skills. A little bit of everything so that he can infiltrate mostly any guild or organisation. Tailor might be a good job since there might be need to change clothes very often to avoid being recognized. It would be very hard to enter a guild if this class became common.

At least if the guild is mostly in-game without a homepage and so on.
Do you have any ideas of untraditional classes?