Henry is generally well-behaved, but is sometimes arrogant and conceited. Henry is at heart a very hard worker, but his frequent bouts of illness hinder his work. His illness almost always has something to do with his boiler. 

During WWII, Henry is put into a group with Percy and James and is shipped off to Africa. Whilst there, he becomes good friends with Ian, an LMS 8F. Their friendship is solidified when Henry rescues Ian from certain destruction. He speaks with a deep, but gentle upper class English accent.