 Picard was not aware of the Moomin characters before he discovered them 20 years ago in Japan, but he has been particularly fascinated by comic strips and has stated to want translate the art of Tove Jansson into animation.The Finnish voice cast of the film was confirmed in August 2014 featuring Maria Sid as Moominmamma, while the English voice cast was confirmed in a September 2014 press announcement.The film's score was composed by many Finnish and French composers, including Jean de Aguiar, Panu Aaltio, Timo Lassy, Milla Viljamaa and Anna-Karin Korhonen.