Fiction

Miles Vorkosigan in Lois McMaster Bujold's series of novels. He is a the son and grandson of great men, and he feels he has to be a great man as well. He has to overcome serious physical handicaps (his mother was poisoned in an assassination attempt when she was pregnant, and the poison -- or, rather, the antidote to the poison -- has made his bones brittle and severely stunted his growth). He turns out to be a great man himself, although many of his achievements he can't tell anyone about, since he spends much of his career as a covert operations specialist for Imperial Security.

Victor Cachet in the Honor Harrington novels by David Weber. He is a man of honor and integrity. He is fully prepared to lose his own life to do what he believes is right.

Huckleberry Finn. He, too, is determined to do what is right, even if he might well "go to hell for it".