Henry is a green friendly tender engine. And one of the three tritagionists (alongside James and Gordon) of Thomas the track master show
Season 1 - The Great Discovery, Thomas and Tillie, The Trouble with Thomas, Mother's Day, The Donut Sneakers, No Rules Rule or New Friend, Cousin Neville, Spencer In Trouble, Bill and Ben (episode), James and Duck (cameo), Good Morning (cameo), Train Safety Tips 1: Stay Alive, Trainz-Mart, and Holiday Mess-Up
Season 2 - Thomas's Fire Drill, Gordon Returns, The Bully, Train Safety Tips 2: Avoid Tunnels and Bridges, Accidents on Sodor, Toby Meal, Henry the Easter Bunny, The Haunted Diesel, Mother James, Scary Stories, ELA Project, Waves Project, and 100th video
Henry is probably dumb because it may have been an inspiration from Tomy Thomas and Friends.
Henry has a crush on Madge.
since the third episode his voice changed dramatically in the first two episodes the grate discovery and Thomas and tillie his voice was low picked and sounded like eyors voice but a little huscky then starting with the trouble with Thomas his voice began to get a little more hight piched and cheerful
Gordon, James, Thomas, Percy, Edward, victor, Kevin, His mother, Spencer, Diesel (sometimes)}}