You can't really make your own person. It gives you people to choose from and then you can give him/her a different name and then change their looks a little bit. You make friends by talking with the guests and asking what their opion of the park is. You also learn while you talk to the guests because when you select chat on the social menu you choose a subject and you talk about. Depending on the person your relationship might go up or down. You can also flirt with teenage guest that are your same gender if you are a teenage character or help match make. when you are best friends with a teenager you can select match make and control them while you look for a girl/boy friend for them.