I've read a few forum posts about the desire for there to be more playability for 'evil' characters, but I think it's worth considering how characters like this (and evil npcs) should be designed.
For, me too many evil characters in RPGs fall into a limited number of easily recognisable categories, some of which are rather tired and stereotyped:
Firstly, characters who loudly identify themselves with the forces of 'evil'. E.G - T'anarii and Baatezu from Planescape, worshippers of evil gods, or whole races (Drow, for example) who essentially walk around proclaiming 'I am evil' with the