Some time ago, I did a writeup on a character that I made for a short-lived Pathfinder campaign. Peter No-Parents, as he was named, was a halfling cutpurse, with a skillset devoted entirely to lying and thieving. He was almost completely useless. He couldn't check for traps, climb walls, or do most of the things normal thieves do. He had almost no combat abilities whatsoever, doing 1d4-3 points of damage, whether he used his sling or his dagger.
What he could do, though, and what he did for almost the entire time he was played, was hide and steal. With a 15 in Stealth, he pretty much couldn't be seen unless he wanted to be, and with a 17 Charisma, he could lie his way out of any tight situation. Further, he could "take 10" on any roll where he was trying to prove/bluff his innocence, and once a day get a +10 to Bluff checks. It was several sessions before the rest of the party even knew Peter existed, and once they did, they just thought he was a waif following them around. I don't think they ever figured out he was a thief.
Needless to say, he frustrated the other players.
I got together with an old gaming group of mine that I hadn't seen in several years, and they were, as luck would have it, jumpstarting a brand new campaign in Pathfinder, and did I have a 1st level character handy?
Oh yes, yes I did.
I'm playing him a bit differently this time, though. First of all, this party a) knows he exists, and b) knows he's a thief. So that's a good start. Second, I'm giving him a bit of depth. While he still plays the Oliver Twist, "Please sah, may oi have anotha?" bit, there are times when his inner cuthroat comes out, and he starts to sound a bit like Tim-Tom from the Venture Brothers.
We appear to be playing some variation of Slave Pits of the Undercity, which is fun, and the party has made good use of Peter's Sneaking ability, sending him up to and around the ruined temple to search out and find out troop movements and such. We've determined that we are horribly outnumbered, and as such are trying to be as sneaky as possible. The entire session was taken up by us getting to the temple, trying to buy the damsel back from the slavers, failing, and then trying to figure out the best way to get in without alerting anyone.
We actually went the entire session without rolling initiative. There were a couple of ambushes, and a hapless orc scout got his throat cut by Tim-Tom Peter when it turned out he really just didn't know anything that could help us, but it was a pretty blood-free session.
Looking forward to more!