A grown baby mainly called, with his mob mentality and his cigar, he is the right baby for the job. Baby Herman has a deep voice and rides in a stroller. He wears a pink bow and diapers. His stage persona, a baby always getting into mischief, is reminiscent of two Tom and Jerry cartoons where the two would have to work together to keep a baby out of trouble; Busy Buddies (1956) and Tot Watchers (1958).
Baby Herman is very impatient and irritable, as shown when Roger messes up during their act at the beginning of the movie. Despite this, he cares about Roger and considers him a good friend. Baby Herman also claims that Roger is innocent when he is framed for the death of Marvin Acme.
In the cartoons, he is depicted as a baby who wanders off and always gets Roger into trouble. Off-set, he reveals that he is really a middle-aged man with a gravely voice who only looks like a baby. He constantly smokes and hits on women. He tells Eddie later in the film that Roger would never commit murder and that he has been framed in Marvin Acme's death and gives him a few clues to support this. At the end of the movie, he celebrates with the other Toons after Judge Doom is defeated and Toontown is awarded custody of the Toons in Marvin Acme's will.
Baby Herman is a regular in the Roger Rabbit and Roger Rabbit's Toontown comic books.
Baby Herman can be seen reading a paper in the queue for Roger Rabbit's Car Toon Spin.