Not really a hero,
but Bruce Lee truly is an inspiration, when it comes to dedication and willpower and achieving what you want.
Did you know he didn't start training martial arts until he was 18 years old? When I was a teen I used to lean on that fact when I felt like I was behind "schedule". "Hey, I'm only 16 - I could still be the next Bruce Lee".
Now I'm 25, so I've had to realign a bit.
Also, an interesting tidbit - one of my favorite things I've ever heard a mad homeless person ranting aloud was "It's amazing to consider that I am now the same age that Bruce Lee reached before his death!"