1) Dick Beardsley - had the opportunity on a couple occasions to chat with him at expos. You'd be hard pressed to find a more genuine, humble guy. I also love his story of rising to the top from modest beginnings.
2) Meb K - anyone who has ever met this guy will vouch for the fact that he is as nice as they come. He has the innate ability to remember you and treat you like a real friend, which is absolutely amazing, given the sheer number of people he meets. I had the real treat of hanging out with him for a week while he was in Mammoth, and it was the single biggest highlight in my 34 years of running. Plus, when it really counts, he ALWAYS has a way of coming through.