[Faceman]

You don't need a good thief that badly in BG2 (SoA+ToB), but it is cool to have one. And the only possibility for this is to play a thief (fighter/thief) yourself. Yoshi, Imoen and Jan will be sufficient for most traps you encounter and locks can still be forced or "knocked" if they can't manage, but with a really good thief we're talking backstabbing and pickpocketing. Gaining enormous amounts of coin in the dirty business, and doing instant kills on nasty enemies such as Mind Flayers.