Bull Heinman is a mentioned-only character who was a tough gym teacher at Io House, and who coached Arnold Rimmer as a youth.
Rimmer was considered extremely wet and weird by his teachers, especially Bull Heinman. (Better Than Life). He took great delight in tormenting Rimmer, who captained the school skipping team (Back in the Red II). Rimmer was made to take extra rugby practice to overcome his wetness (Timeslides).