The Hemulens that live in Moominvalley are often avid collectors of various things. They too believe in order, and are therefore also suited to be the policemen of the valley. Hemulens are in general quite bad at listening to the opinions of others and really lack a sense of humour.

They often wear dress-like attire that extends to their feet. Hemulens first appear in the story, The Moomins and the Great Flood.