His friends include Sniff (a mouse/kangaroo-like creature), Snufkin (a carefree and wise wanderer, and Moomintroll's best friend), the Snork Maiden (Moomintroll's egotistical girlfriend), her brother the Snork (who became a bumbling genius in the 90s anime to make up for his complete lack of personality), Little My (the bratty and practical half-sister of Snufkin), the Mymble (her older sister, sometimes called the Mymble's daughter to distinguish her from their mother, also called the Mymble) and a cast of thousands composed of Fillyjonks, Hemulens, Park Keepers, Tofts, Hattifatteners and one big ol' Groke - the monstrous personification of winter depression. Moomintroll, the youthful main character, is the son of Moominmamma and Moominpappa. The most recent adaptation is Moominvalley, a CGI animated series for Sky (13 half-hour episodes, premiering in the UK over Easter of 2019, followed by 5 over Christmas 2019 and 8 over Easter 2020, making a total of 26 so far). Following the success of the books, the franchise was extended into a comic strip, a string-puppet show, a live-action suit series, a stop-motion animated series, multiple stage plays, three animes, and an animated film, ( Moomins on the Riviera). The books themselves are surreal, often scary, somewhat philosophical, and very interactive. The cast of characters is varied, ranging from childlike humanoids to creatures from all over the world.

First created as a series of Swedish-language children's books by Finland-Swedish author Tove Jansson, Moomin is a well-loved franchise starring the hippo-like Moomins, who live in Moominvalley and have adventures with their friends.

Moomin comet in moominland