My favourite character build was, in a semi-standard fantasy setting, a sort of trader/merchant/wizard hybrid. Not much in the way of combat skills, but Charisma, Persuasion etc. through the roof. Had a few spells (e.g. Levitate) that he used to really good effect.
Many of his remaining character points were invested in:
The Bag - A Bag of Holding type thing, that held all the items he was trading. We never specified what was in there, because we wanted to avoid boring the rest of the party with miscellaneous trading, so whenever I wanted to pull an item from the bag, the GM simply assigned a probability of me having that item and, if I succeeded on my roll, I had the item.
The Tent - Actually closer to a portable market stall. Magical, of course, and about the size of a large carpet. Lay it out on the ground, say the word, and you have an instant market stall to sell stuff from.
His greatest feats:
Selling a completely ordinary carpet to another player as a 'Magic Flying Carpet' and, with the other player not having purchased a 'Carpet Pilot's Licence and Training Course' at the same time, obviously being unable to make it take off. So he had to hire my character as a pilot. Every time. Levitate is a wonderful spell.
He also managed to sell several jars of 'Monster Repellent Cream' to another, seriously combat-averse party member in a private trade (which the GM missed out on because he'd gone to pick up pizza or something). In the very next battle, totally coincidentally, the GM had set up the enemies as a bunch of automated golem thingies - which only reacted to being attacked. Needless to say, the combat-averse character was completely ignored by the golems, and the legend of Monster Repellent was born!
He finally met his end when the party went off to divert an orc and hobgoblin army from the city. With companions sick of being sold junk, and a '1' on his Wisdom roll, the party managed to persuade him of the unutilised market for weapons and supplies presented by the enemy army. Needless to say, he couldn't talk his way out of that one!