From the book, leadership: theory and practice
Neuroticsm
The tendency to be depressed, anxious, insecure, vulnerable and hostile
Extraversion
The tendency to be sociable and assertive and to have positive energy
Openness
The tendency to be informed, creative, insightful,and curious
Agreeableness
The tendency to be accepting, conforming, trusting and nurturing
Conscientiousness
The tendency to be thorough, organized, controlled, dependable and decisive
Study shows extraversion is the mostly associated factor with leadership. Conscientiousness is the second most common factor among the leaders. Neuroticsm and openness are the next common ones, with neuroticsm being negatively correlated. Agreeableness is weekly correlated with leadership.