Here is Mathuin "Mat" Ebson, Mainer's character.
I know I'm missing some stuff from the stat block (Wound Points, Wound Threshold, Vigor points, and the little things that Mat would have). If there is anything else that needs to change, let me know.
Overall, he's not the hardest hitter, but he should be able to hold his own in battle and handle/prevent damage. Even tried to get him to be able to make a decent Charisma check.
@Claustipher - I've written Claustipher into Mat's backstory as a grandfatherly figure. He would find out, at some point, as Mat would need to talk to someone sooner or later. By the time the events of this game have occurred, Mat would have told him.