I'm slowly learning narrative writing and I have yet to check material pertaining to how to write protagonists, that's why I'd like your input. One thing I've heard several times is that you can't write an unsympathetic/straight unlikable protagonist, even if you're purposefully making him deeply flawed. At first it didn't make sense to me, but I've read many people saying they dropped a certain book/game/whatever because the protagonist was too much of a jerk, even though it was going to obviously follow a path of redemption. How flawed can a protagonist be before the user starts rejecting him? Is there some kind of implicit limit? And, most importantly, do you suggest some good readings about the matter?