In each case, they are singular men and women who are admired to an extraordinary level. They can be charismatic or work behind the scenes.
Some examples--and you ought to select from these because (1) You SHOULD learn about people, and (2) you SHOULD know about people already, yes? This has a built-in "Darwin Award" motivation too: if you don't know why or who helped society and why their life mattered, you won't have much to offer society yourself--so plan on your own "early departure."
Tell me what they did, who they influenced, if it was a particular group, what they did, or are doing, to help uplift Man and Womankind, why they feel (or felt) their issue is/was important, how they are working (or worked) to raise consciousness, and where they work (or worked) with specific examples.
Also…tell me WHY YOU PICKED THEM. VALIDATE HOW THEY HAVE MADE AN IMPRESSION ON OTHER PEOPLE AND YOUR LIFE (IF APPLICABLE) with specific examples.
Uh, no. Your parents, relatives, friends, or other people in general aren't available--unless he or she just won the Nobel or Pulitzer-type Prize in their respective field.