Nice or Mean
Smart or Stupid
So, you can have Nice+Smart or Mean+Stupid, and so on. Four basic permutations are possible, with only subtle variations within their mixtures.
Statistically, there are more Nice+Stupid than anything else. After that, is Mean+Stupid. Third is Mean+Smart. In last place is Nice+Smart. That's right, it's the rarest of all kinds. Rarer even than RH-negative blood type. Rarer than winning a lottery. It's God's (or someone's) way of reinforcing the basic concept of scarcity-vs-value. If we had our favorite food every night, it would be boring and cheap (by value). But because most of the things we truly value are hard to obtain, they remain desirable. That's why Nice+Smart people are the most charished of all types of people we know.
The worst combination is of course Mean+Stupid, but Mean+Smart can be diabolically bad on occassion (think of most John Malkovich characters).