I think I consider my sister to be one, although she still needs to pay credit regularly but I bet she can live well without working for the next 10 years or so. She's a hard-working person, and she knows when and how to take chances. You also need to be smart to do that, although that's more about her working environment which demands a high understanding of certain subjects.
Not sure if she has multiple sources of income, but I believe she invested in various assets diligently. So a passive income is one of the things that help you gain some degree of financial freedom IMO.