Hemulen is a recurring fictional character from the Moomin series, known as a rather strict, orderly, and somewhat eccentric creature who often represents authority, rules, or bureaucracy. In the stories, Hemulens appear in different forms and roles, but they are usually depicted as serious, meticulous, and easily absorbed in their hobbies or duties. They add humor and contrast to the carefree Moominvalley world, often serving as a comic foil to the more relaxed and adventurous main characters.