Moomintroll is a fictional character created by Finnish-Swedish author Tove Jansson. He is a gentle, round creature resembling a hippo and is the main character in the Moomin series of books and comics. Moomintroll lives in the idyllic Moominvalley with his family and friends, exploring themes of friendship, adventure, and the beauty of nature. The Moomin stories are beloved for their whimsical illustrations and philosophical undertones. Moomintroll's adventures often involve encounters with various creatures, such as the Snorkmaiden and Little My, highlighting the importance of community and acceptance. The series has been adapted into various forms, including animated shows and stage productions.