Rusty

Rusty is a strange fellow that can be thieved as well as attacked. He gives the same amount of coins as well as similar drops and thieving experience as a man. When you talk to him he asks if you are carrying anything valuable, and, after you question him further, says, "It's been ages since anyone said they had something worth stealing." then stammers "Not that I'd dream of stealing something, of course." He hangs out with Narf, Cuffs, and Jeff, presumably his gang of thieves.

Location
North of Falador on the way to the Mind altar.