Personality cannot be quantified. Personality can be perceived. Why we are delighted to hear somebody is beyond any scientific explanation. Similarly, why we love seeing some body walk is beyond any science. Personality is a mix of traits that gives a whole impression that can be either attractive or disturbing.
How to improve Personality? Since we judge people with their personality, it is important to find out why a person attracts while another creates negative vibes. Let us begin with posture. Watch yourself in the mirror. Are you keeping a straight body? Watch yourself walking. If you see somebody else walking like that, would you like that? If yes, great, otherwise find out what can be done for improvement. Go through all your normal body movements with a fine comb and bring necessary changes in them to make yourself more attractive.
How about your body maintenance? Do you keep your nails perfectly manicured? Do you look fresh at all the times? What about your hair? Are they healthy? Is your hairstyle enhancing your face value? What about mouth odor and body odor? Make a list and take care of all these aspects.
How about your talking? Your tone, your vocabulary, your choice of words, are they perfect? The way you make sentences, is that appealing? Can you make your voice sound inviting and attractive? Small additions and changes will slowly make big changes in your personality and make you a star.