Already did this. The whole point of the Operation Wintergreen blog series was to have a story that followed the narrative structure of Core Theory without having any of the titles or other silliness that got Core Theory shot down. Setoth was the Sage, Arkady was the Warrior, Michenab was the Guardian, and Kalias was the Hero.
Unfortunately, Kalias didn't get quite as much characterization as the rest of the cast, but there were some Hero traits to him. He acts extremely self-sacrificing, putting himself into huge danger to try and save strangers. He also had a very strong sense of determination linked to that self-sacrifice: when, from his perspective, it was only him suffering from Slendy, he gave in pretty easily, and was on the path to being hallowed. Yet the instant he sees Slendy take a child right in front of him, he snaps out of it and goes to insane lengths to fight back. And our portrayal didn't have him "in your face against proxies" at all; if anything, he was the closest to a pacifist the story had (compare him to Arkady, who went out of his way to fight against proxies, or Setoth who once attempted to kidnap them FOR SCIENCE!) The time he is forced to kill proxies, he went into a huge depression, and during the final battle, he's on the Rescue Team rather than the Let's-Slaughter-Everything-With-An-Operator-Symbol-On-It Team.