Aim

A little more on the aim for this world. Who should enjoy this server, who should better go elsewhere, what should be known before making a character.
Basically, the NWN crowd is usually devided into categories like Roleplayer, Powergamer, Munchkin, Roleplay Purists, Action Gamer and so on. Basically, I don't like any extremes. Munchkins are utterly annoying, as are Roleplayers who have to throw a dice for every single fart they do and consider reaching level 2 powergaming.
I do not like powerbuilds that are only good for making a character as strong as possible, but I do understand the wish to make a character who does good in battle and knows how to survive.
I do understand the fun in making a roleplay character who does nothing else in his life than sitting in a tavern telling stories, but I do not like an elitist roleplayer attitude towards the rest and forcing an hour-long dicerolling orgy on someone who just wants a little fun after a hard working day.

Experience (and the making of it) should not be a forbidden word or thought, but it shouldn't be the main goal either. Everyone likes levelling up, granted, so it shouldn't be too hard to get somewhere into the low-mid levels. Playing should be fun after all, shouldn't it?
On the other hand, this world should be all about atmosphere and immersion, so levelling up is and should be considered a bonus, not more. The main goal in a multiplayer world should always be the interaction of characters, and on a roleplay server, this should be in character and by thinking up nice stories and backrounds for a PC. Roleplay is the focus, but action is by no means forbidden.

Now, as for building a PC: I don't like too many rules, I don't like spoiling a player's fun, but I also don't like obvious munchkin and powergame characters only built for strenght without any "clue" for a class choice in the player's roleplay. That's why I'll go with the Vives rule regarding character builds: At least 3 levels per chosen class have to be taken. That means, no Rogue 19/SD 1, no Fighter 9/wiz 1/AA 10 and so on. I'm really sorry for that, but my personal opinion is that a class should have at least a little meaning and not just be treated as a brick in the building.
On the other hand though, I won't ever ask a player to play along the clichées and stereotypes of a class. Let's say, a player wants to make a character that resembles Connor MacLeod, Emma Peel or James Bond and for achieving that goal, has to choose a class mix that would be considered "illegal" by the classic DnD player. I say, go ahead - mix your CoT with an Assassin or whatever as long as it makes sense and is not just a cheap excuse to build up a ridiculous "über" powerbuild. Usually, I'd consider a Paladin/Blackguard at least "some sort of weird" because obviously, there are a lot of things that stack in such a build and make this a very powerful PC after all. BUT there have been cases of astonishing roleplay of a class mix like that, not to forget that the "fallen Paladin" is even somewhat "legal". This would be an example for a case-by-case decission. If there's a rotten "powerbuild" stench around the PC, I'd call it munchkin, if there's a chance for an interesting character, I'd call it a great addition.

In my opinion, common sense should be the judge, not any rulebooks. The fallen Paladin, fallen Angels and so on make perfect sense to me, so that option will be open, although maybe a case-by-case DM decission.
Assassins have never been truely evil in my opinion, if I'd make a James Bond or any kind of spy character, there'd surely be assassin in the class mix.
Blackguards on the other hand should be evil, Paladins should be good, but there's always the chance for a fallen Paladin or a Blackguard who uses evil means to aid the good (may it be pressed, may it be for an egoistic reason, it all depends on the character's motivation and roleplay). A good Blackguard doesn't make sense, a cooperative evil one does.

I could go on with monks, bards and so on, but these are the most common ad extreme examples. As you can see, alignments are the DnD rules I respect the least, they've always been too black and white for me, support stereotypes and hinder creativity. They will still function as basic guidelines, but will never be treated as main rules.