Mr. Men is a series of 49 children's books by Roger Hargreaves, commencing in 1971. The series features characters with names like Mr. Tickle and Mr. Happy who have personalities and physical attributes based on their names. From 1981, an accompanying series of 42 Little Miss books by the same author, but with female characters, was published. After Hargreaves's death in 1988, his son Adam began writing and illustrating new stories.