In the thread about good, the points cropped up about stereotypes.
The problem as i see it with the FR setting sometimes is that players get 'forced' into a role by the class that they play.
For instance, an average cleric of Torm. Does he really have a personality of his own? In a lot of cases - no! Players can feel forced to play him according to dogma as a frontline fighter in the battle against evil, and as such, one guys cleric of Torm ends up EXACTLY the same as the last because they end up feeling restricted by the dogma, and denied any freedom of expression due to their choice... the necessity of the alignment. They just end up one-dimensional and dull.
This is a problem. How can you entertain people when your cleric is the same as every other one they've ever met? How can you maintain your own personal interest (without reverting to numbers and relying on being stupendously combat effective to get over the stumbling block of banality)
In my personal opinion the best thing you can do is, think of a major character flaw. Your Cleric has a weakness for gambling. Your cleric dislikes Elves for no obvious reason. Your Cleric despise the knowledge that he is going to die one day. Something like that. You can have an incredibly heroic and brave character that is essentially a good man, but is so blinded entirely by their need for everyone around them to work for everything they get that they are quite willing to slaughter their own party in the heat of battle because they ran away from combat, leaving you on your own, or they looted a comrade.
Then, think weaponry. So many weapons in nwn, but everyone seems to end up with the bastard sword, the greataxe, the shortsword or the longbow. Why doesn't he specialise in dart throwing (due to say, being brought up in a circus)? Little things like this can make all the difference, and change you from being "hooded elf rogue 101" to "This amazing elf rogue guy that duel wields kamas and spits every time he sees a gnome for reasons he never shares".