Of the big 5 personality traits in psychology, the three most highly correlated with success are: high disagreeableness, high conscientiousness, low neuroticism.
Are those three correlated with success? Or simply leadership? If the former I'd like to know how "success" is defined. "Success" is a very broad and ambiguous word.
It's been a while, but my understanding was that it was pretty generic success across significant goals. So that would range from financial success to curing measles.
High disagreeableness means being able to dismiss most people, because most people will tend to pull you in towards a regression to the mean.
Low neuroticism is about stress tolerance. Doing anything major/new/difficult is stressful.
High conscientiousness means you spend time preparing, finish important tasks right away, pay attention to detail, and work well on a schedule.
It's hard to imagine being highly successful at much if you can't handle stress, are disorganized, and are very sensitive to others trying to tell you to do what everyone else does.
One of the best things I ever did was stop caring what others think and become more disagreeable. It's sort of ironic that people didn't like the agreeable me (I assume too boring) but I'm far more liked as a disagreeable person. I may also be that I come across more honest when I tell people "no", or I contribute what my actual opinion is instead of whatever is easy.
So there's an interesting give and take here.