Arijit Singha Posted about 4 years ago What makes our personality and why is unique then billions of people? The personality that defines a person is directly influenced by the environment he/she interacts with. It is influenced by the day to day happenings around that individual. As a child you learn by seeing your peers and your elders. Then there is the question of the different languages and cultures that you are brought up in. And then there is the media. We form our own prejudices and these shape our personality and makes it unique. We might be able to imitate another person but can never replace them.