I have lots of favorites, but my my top choice would be Tim Drake (my avatar - and yes, I know that the TAS version is heavily based on Jason Todd, but it's Tim in the show, and I love him in the comics, as well, even though he doesn't get quite as much action as he used to when he was leading the Teen Titans and had that great solo run).
But fuck it, today I wanna talk about Jesse Custer.
As a boy, he had a hard life. But he received crucial advice from his father:
And despite some issues here and there, he stuck by that promise.
Most importantly, though, he knew when to close the door and walk away.