In another thread I've seen that many people don't like to give their sims "negative" traits like evil, self-absorbed, mean etc, but I personally think those sims are hella fun. I just noticed that wi...
I just press random and forget Traits exist, since they don't really do anything outside of giving moodlets, but so does everything else in the game and in much larger quantities.
Also Evil is definitely a positive Trait, the only thing it does that affect gameplay is giving a Happy buff under certain occasions, and Sims with the Happy mood are much more likely to be friendly, regardless if they are Evil or not.