Ali

While now exclusively shown on pay channels, I remember, as a kid, that boxing was frequently shown on regular TV.   As a result, many more people watched the great matches between iconic boxers- Ali, Forman, Frazer, etc.

"I don't trust someone who is nice to me but rude to the waiter.  Because they would treat me the same way if I were in that position."

- Muhammad Ali

For me, this shows someone's true character.