Continuing the discussion from Diverse gaming groups:
Conversation between PCs and NPCs is the part of RPGs that I enjoy most, and I have been told that it is what I do best as a GM. PCs are often, perhaps usually, characters with whom the players sympathise and whose values they accept or even share. The conversations that they have with NPCs that get dealt with in direct speech, especially the ones dealt with at length in direct speech, are disproportionately conversations with opponents and with parties who must be persuaded to promote their goals. That is, they include conversations about their goals with characters who do not share them. Thus I often find myself extemporising and delivering dialogue for villains and other characters with whom I profoundly disagree. Anyone who played in one of my games and supposed that the omnicidal maniacs, murderous bigots, kleptocratic egocentrics, fanatical Stalinists, unrepentant former obersturmfürers and gauleiters, ruthless gangsters, abject authoritarians, priests, dragons, vampires, mining company executives, demons, and minor gods that I play as opponents for the PCs was a mouthpiece for my views would be missing the point entirely.