Hero In My Eyes

But what is a hero in someone else's eyes? Is it one who is trusted not to lie?
Or maybe one who wants to hold your hand. The one who keeps you on dry land.
How about the one who's laugh is your light? Even when you're in the middle of a fight.
Or the one who almost breaks. But gives it all for your own sake.
A hero who smiles because of you is one to surely save your day. Even if that is just them saying "hey."  
But surely I know the best hero. Because they're the one to claim they're at zero.
They're the one that all this fits. But who will never believe it.  
The best hero of all. The one who still keeps me smiling, even when I want to bawl.