Phion
Explorer
Have lots of powers, and then quest they can do to eliminate those powers.
For instance, they go on a quest to bring you a slice of pizza from the other side of the table (which would be 25' long in game). Then you can't cast any spell that requires the verbal component since your chewing.
other one could be to steal some of your dice so you can roll them, carry a flashlight to shine in your eyes to blind you, laying down d4's to hurt your hand if you reach for something, and take the DM screen so you can fudge rolls.
On that note they should basically attack the DM where he is weakest. Reality. No XP, just a lawsuit.