The dark urge is more than just an evil compulsion. Even though the character can't remember the past, the past still existed and comes out through gameplay. Anyone can play whatever they like, of course, but if we're talking about RP'ing choices that make sense then it might be best to avoid certain classes.
Hear! Hear!
Good point about Druid - although they are Neutral on the Law-Chaos axis, they can be squirrel kicking (
it attacked me first!) Evil.
I tried to play a Dark Urges resisting Durge but murdering Alfira broke me. Durge is not for me, at least for now,