Well, pretty much like this: “Goodmorning good people! You adventurers look like you could use some gear. Well, Stormhammer & Stormhammer have the best weapons and armor for killing goblins and orcs! Jorn Stormhammer, at your service— don’t touch my wares, please— DON’T TOUCH MY WARES!”
Yeah, he’s a barbarian.
If you’re okay with it, I’ll create him tomorrow, stats and all.
Barbarian merchant is quite a twist. It's cool with me if it's what you want. Stats should be determined according to the method mentioned in the RG. Honestly, I can't recall whether it was point-buy or Standard Array.