The Renfield take their name from Bram Stoker's Dracula and its secondary antagonist, R.M. Renfield, a psych ward patient with a penchant for consuming living organisms. In the novel, Renfield is under the control of Count Dracula, just as the Renfield in Morning Star are slaves to the Dust. Marvel artist Mike Choi designed the Renfield in Morning Star in one sketch, and from there the enemy has evolved into varying classes: sniper, trooper and "some surprises," Harris writes.
Get a good look at the Renfield on the Industrial Toys blog.