So, I haven't had the opportunity to really feel out Aurelia's character and personality yet, so I don't really know how she'll develop, but I definitely know what Veteran Huntsman Smokey will look like.
He doesn't get any taller, but he does get bigger. Imagine this bearded, barrel-chested, python-armed biker guy. Now, cover him in tattoos of the biggest and baddest Grimm in Remnant. Like, Nevermores, Deathstalkers, maybe one or two Goliaths, Geists possessing huge amounts of material, anything that might warrant a shot from the Good News.
Speaking of which, the Good News would have more specialty ammo than the standard big boom the current casing uses. There's a bullet filled with a special mix of lightning dust that wipe out entire packs of Beowolves in one shot, and a water dust bullet designed for undersea Grimm, just to name a couple of them.
Matchstick would be upgraded from a revolver to an automatic weapon that's fed through a belt, with arguably more kick per shot than it had before. Yes it can still fire 7 shots at once if it needs to.
Oh, that leaves his semblance. So, he'll eventually learn how to resist the force of gravity, which means he'll have moon hops. He'll go from being an immovable object with a big-ass gun, to an unstoppable object...with a big-ass gun.