A tangent thought: I think the nice/jerk dichotomy/model is somewhat misleading. It's really compressing two separate axis into one. I think a better way to think about it is this: you have a kind-unkind axis and a dominant-weak axis; and "nice" tends to be in the kind/weak sector while "jerk" tends to be dominant/unkind sector. You still have two other sectors though, and I think that's really where you're going to find your heroes/villains.