Hob

 was the loyal robot servant of Josiah W. Dogbolter. (COMIC: The Moderator, Time Bomb!)

In anticipation of Dogbolter meeting Frobisher again, Hob was installed with a null-beam to block Frobisher's shapeshifting Whifferdill abilities. After Dogbolter was broadcast on the Galactic Broadcasting Corporation confessing to murder, Hob offered his resignation. (COMIC: The Stockbridge Showdown)

Behind the scenes
Jamie Anderson, who had to cast the character for The Quantum Possibility Engine audio, which he directed, was searching for someone who could channel Peter Lorre, the actor portraying Joel Cairo in the movie. (The Big Finish Podcast, 21 October 2018.)