The only individual characteristic that matters is incumbency.
Most other factors mostly do not depend on the individual who is running. For example, recession, military victories/losses, results of midterm elections, significant third party challenger, etc. The party can run anyone and it would not affect those points.
However, I overlooked another individual characteristic: there is an extra point if the incumbent is a victorious military leader or has significant appeal to members of the opposing party. The only person to get that point in this century was Obama, and only in 2008.