What are the central characters in a series of books by Swedish-speaking Finnish illustrator Tove Jansson?

The Moomins are the central characters in a series of books and a comic strip by Swedish-speaking Finnish illustrator Tove Jansson, originally published in Swedish by Schildts in Finland.

They are a family of white, round fairy tale characters with large snouts that make them resemble the hippopotamus. However, despite this resemblance, the Moomin family are trolls. The family live in their house in Moominvalley, though in the past, their temporary residences have included a lighthouse and a theatre. They have had many adventures along with their various friends.

In all, nine books were released in the series, together with five picture books and a comic strip being released between 1945 and 1993.