The Ministry employee whom Harry impersonates when the trio infiltrates the Ministry of Magic. They know nothing about him when they pull him off the street, but it soon becomes clear that Runcorn is a feared and high-level supporter of Voldemort, though not a Death Eater. Though Harry has no idea how much power Runcorn actually has at the Ministry, he's able to use Runcorn's power to help all the Muggle-borns awaiting trial escape.