Henry is a green mixed-traffic tender engine who works on the Crotoonia main line. He was originally a failed prototype engine, and needed special Welsh coal to operate properly. Following an accident when pulling the Flying Kipper (an express fish delivery train on Sodor), Henry underwent an extensive reconstruction, giving him a new shape.
Henry is generally well-behaved, but he is occasionally arrogant and vain. Henry is at heart a very hard worker, but his frequent bouts of illness hinder his work. His illness almost always involves his boiler having some sort of issue.
That doesn't mean however he can't be a big softie at heart. He loves nature and would spend most of his spare time going to the forest to be at peace.
He may not be too bright at times and he can also be really worrisome, as shown in Tillie to the Rescue where he was worrying about whether or not The Fairytale Arrow would make it to Celgreb City on time.
Henry's history is unusual. The Fat Controller had intended to buy a Robinson Atlantic of the Great Central Railway, but was swindled and instead received Henry. He was built from rejected plans for Sir Nigel Gresley's A1. The plans were stolen from Gresley by an anonymous rival. The resulting engine had a superficial likeness to Gordon, but aesthetics were as far as this went. Henry in this shape developed performance issues from flaws in the design, compounded by his stay in the tunnel. Henry was a bad steamer: with good-quality coal he could get enough heat to make plenty of steam, but when there was a poor lot delivered, his undersized firebox could not hold enough coal to make a proper fire. On advice from Henry's fireman, high-grade Welsh Coal was ordered, which made an appreciable difference in Henry's performance. When Henry suffered an accident and severe damage that winter, the opportunity was taken to send him to Crewe, where he was rebuilt an LMS Stanier 5MT "Black Five" 4-6-0.