Hawke does do things that are supernatural. Winning a 6 on 4 battle is itself an incredible feat IRL, and to do it so consistently is incredible. Hawke regularly kills creatures that should take armies to slay them - like pride demon abominations and dragons. Same with the HOF. Hawke does things that require supernatural athletics even if we ignore the absurd numbers we see in game as an exaggeration on Varric's part.
And yes that's my point - every PC in an RPG is a special snowflake. At least the chosen one plots own up to it.
I think, as well, that video games are not faithful depictions of how the actual story would occur. A novelization of any video game isn't going to have the PC/protagonist actually kill the number of enemies that we're able to kill in the game. The novelization is also going to have the protagonist take the most direct route to accomplish their goals, whereas in a game we're rewarded for going off track and putting ourselves in harm's way. Game mechanics don't equal realism.
Someone pointed out in another thread that in The Witcher books, monsters are becoming more and more rare, and Geralt hardly does any Witcher jobs for the most part. But in the games, there are hundreds of monsters to kill. Because if there weren't, there would be a whole lot less content in the game. And fighting enemies is a large portion of RPGs.
Are we to believe that because Hawke bought additional backpacks, s/he is able to carry additional large weapons and armor? A backpack isn't going to be able to carry the increased inventory, we would need a pack mule or a cart. But for gameplay purposes it's easier to just have us buy a backpack. Would every single enemy in a video game fight to the death rather than retreat or surrender? Even wild animals, who would more realistically run away the first chance they got? No, but then we wouldn't get the experience for killing them or would have to chase them down to finish them off. That wouldn't be convenient gameplay.
So I don't assume Hawke actually kills all of the enemies we see in the game. I don't believe the HOF kills as many enemies as we see in the game. I don't believe Geralt/the Inquisitor/Shepard/Revan kills etc etc