Brassneck

Brassneck was a coal-fired diplomat robot, known to Sugarpea as an armoured peacemaker. Sugarpea activated it and linked it to her thoughts. Once she had transferred the debt of Loam to herself, she made Brassneck kill her to make sure it stayed free of the Krib. Sugarpea programmed a final set of commands to Brassneck to say to Sweetleaf. Martha Jones speculated it might have been all the things that Sugarpea wanted to say to Sweetleaf, but never had the chance to say. (COMIC: The Woman Who Sold the World)