Charlie has a reputation for being a really fun engine. He has an unquenchable desire for fun, games and play, and is said to have been the favourite engine of the Mainland Controller. Charlie can get easily distracted by his japes, sometimes distracting others in the process. Charlie can be pouty, huffy, and teasing at times, but he always wants everyone to be enjoying themselves. Often though, Charlie will learn that the opinions of others, keeping calm and working hard to complete your jobs foremost, are important if you want to be a Really Useful engine. He has a good working relationship with Edward, often calling him "Eddie", who is sometimes capable of taking Charlie under his wing, and Thomas, who Charlie enjoys racing and sharing in the fun with. Being a fun-loving, playful scamp, cheeky Charlie is popular at parties and fairs, is well liked by the children, and known for his youthful humour.