Hi all you happy people! I be Hughes, and this be Cyril of House Saelac. I am here to join this parade of dreams.
Cyril is (was?) of the warrior caste back in Orzammar, and he came topside to fight off the last Blight. Whereupon he was terribly wounded and it took him about two years to recuperate. The first few months he stayed in Denerim with his cousin (actually his fifth cousin once removed, but who is counting?) because he couldn't be moved. And than after that he stayed because he was already there and going home might make him casteless and even if they didn't he'd have to go back to darkspawn killing. So he stayed.
He's been in Denerim for the past fifteen years, and he's had his shop open for the past fourteen. His shop is one of the few all stone shops in the market, because he's burned it down twice and blown it up once when it was fragile wood construction. He's very eccentric but also good at what he does - mostly making traps for his own amusement and occasionally selling them, although his biggest moneymaker is repairing and refurbishing weapons and armor.
When all is said and done though, he's pretty much ready to get back to Darkspawn killing (being a merchant is only fun for so long...) at least - if he can bring himself to walk outside! He'll be joining group three.
Edit: Pertinent information. He's a dwarf, warrior, Champion. Aged 52, going grey and has enjoyed the surfacer food a bit too much to fit into his old armor. He fights with a greatsword.