4 quadrants of personalities have been identified. Hippocrates called them Sanguine, Choleric, Melancholic and Phlegmatic.
Translated into the 21st century, we use the DISC model, or Dominance, Influence, Steadiness and Conscientiousness. See others clearly, with 20/20 vision, and have more impact by learning the principles of 4 quadrant personality.
Charismatic leaders study 4 quadrant personalities to enable them to observe the subtle nuances of employees and using their knowledge of personality strengths to move teams forward to collaboration, cooperation, creativity, and innovation.