I actually would just say it's a Chaotic Good character in DnD.
However I agree that there is no need for an alignement in DOS2. The reputation works well enough I suppose. If everyone hates you, chances are you are bad.
I'll bow to your superior knowledge regarding D&D since mine comes entirely from hearing other people talk about it! Maybe the pigeon-holing isn't quite as bad as I'd thought but I think I may still feel a bit constrained. I like fine-grained reputation systems but even then can feel a certain degree of pressure to perform as expected.
I also like that sometimes you may finish a quest thinking it was a good solution but in the end the consequences are pretty evil although you did not foresee that. I don't need an alignement meter to reflect it you know and feel bad already. And it could work the other way around too.
I agree that's a good thing if used sparingly; and if done properly, as I'm usually reminded of Fallout 3's Tenpenny Tower quest as one whose "unintended consequences" was done very poorly and it wasn't so much a case of feeling bad as feeling irritated... had it been better written I'd have left it at feeling bad but instead I used the console to manhandle its outcome in a more agreeable direction.
