Barry

Here’s Barrabás, or Barry, which is the name Quilladon Quillathe uses to refer to his pact of the chain Imp, apparently he’s a servant of Glasya. With the task to serve and protect Quilladon, and maybe corrupt him on the way.
He certainly is much smarter than the average imp, and seems to have his own personal interest on the warlock.
“A little cheating on cards, a tiny bar fight... perhaps an itty bitty murder? C’mon that guy’s asking for it...”