This is a bit of a follow-up to the topic, "Who is the most badass antagonist?" (http://gtaforums.com...dass-antagonist).
With the title itself being self-explanatory, I'm gonna have to go with Johnny Klebitz. His personality and his loyalty is exceptionally great -- to me, he's the most unique protagonist. What makes things better is how he has plenty of similarities with John Marston from Red Dead Redemption. I figure that they'd get along well.
It's a shame he was killed off in GTA V for sh*ts and giggles and a cheap shock factor.