Wow, this one's a toughie. So many to pick from. I grew up on baseball so my picks lean towards: Roberto Clemente, Sandy Koufax, Bob Gibson, Ernie Banks and Willie Mays.
I wish kids now-a-days would look up to the true 'Good-guys' with the likes of David Robinson who does ALOT for the San Antonio area. And speaking of doing alot for the San Antonio area, a non-sports figure comes to mind...George Strait. George has to have more $$ than possible to count and donates it anonymously where the David Robinson Foundation makes sure that it's known that it was behind whatever donation.
But, alas, kids now-a-days unfortunately look up to the 'gangsta-hoopas' type cause it's 'cool' to be a bad guy.
I'm starting to go on a rant here, so I'll quit.