I used to know this kid that said he learned almost everything he knew about morals from watching Star Trek. Perhaps barring his parents, he believed that watching thousands of hours of Star Trek moulded his character more than anything else.
I put it to David Gemmell, when I met him at a talk he gave in Dublin, that his writing had a similar impact on me as a young teenager. I was half-joking, but he mulled it over and said that ultimately he liked the idea. Mainly, I think, because he was never shy about the fact that his novels were intended as didactic, serious commentaries on what it means to live a strong, authentic life ... as well as being bloody good stories.
Shadak's Iron Code, Tenaka Khan's covercoming of his outside status to save two cultures, John Shannow's hawklike pursuit of evil ... These are powerful antidotes to the nihilism and moral relativism which has become de rigeur in our society.
I won't say that Gemmell's writing was the reason I made the decision to become a police officer. Robert Heinlein and others were at least as influential...
But nevertheless, if you can read his stronger works and not be filled with a powerful urge to try and live a more honorable life, then there's something wrong with you.