Claim: Little My, a character that first appeared in The Exploits of Moominpappa (also a character who was orphaned in his younger years, and is a restless soul) is adopted by the Moomin family.
Evidence: Little My (original Swedish: Lilla My, literally: "Little Mu") is a character in the Moomin series of books by Tove Jansson. The character first appeared in the fourth book, The Exploits of Moominpappa (1950). She was eventually adopted by the Moomin family.