Here come the scallywags, ragamuffins, and troublemakers.
Bandit, mugger, or thug -- steals by force; often part of a gang of thieves
Burglar -- steals by breaking and entering
Fence -- buyer of stolen goods, may serve as a pawnbroker
Pickpocket or Cutpurse -- steals by stealth
My brother Seph likes the idea of a cutpurse. Normally pickpockets are the ones that are used the most in stories, so a cutpurse is an interesting twist. Necessities being a good sharp knife, a quick hand, and a stealthy getaway.
Procurer -- streetwise specialist in finding whatever the client might be looking for
Smuggler -- moves stolen or illegal goods
Wanderer -- a "barbarian" nomad, drifter, or rover
Only one more class to go, and then that's it.