To write about this theme, ask yourself some of these questions: What makes me different? Do I have any special talents or abilities that make me more interesting? How will my skills and personality traits add diversity to the class? What makes me stand out from the crowd? How will this help me to be a better physician and student? Your goal should be to turn whatever makes you different – even a flaw – and turn it to your advantage.
A talent, unique background, or other aspect of your life that makes you diverse can make an excellent opening to or focus of your essay, and it will surely make your it all the more personal. If you take this approach, however, make sure you always tie your story back to the first two themes: why you want to be a doctor and why you're qualified to become one. This can be a challenging task, especially if what makes you unique doesn't show an obvious connection to your aspiration of becoming a physician, but, if you creatively show what your unique background will bring to the school and practice of medicine, it can benefit your application.