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Mr. Men is a series of 49 children's books by British author Roger Hargreaves commencing in 1971. Two of these books were not published in English. The series features characters with names such as 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, were published, although nine of them were not published in English. After Hargreaves's death in 1988, his son Adam Hargreaves began writing and illustrating new stories, including four characters that his father had developed before his death.
Each book in the original Mr. Men and Little Miss series introduced a different title character and his/her single dominant personality to convey a simple moral lesson. The Mr. Men and Little Miss characters frequently reappeared in other characters books. As of 2015, a total of 85 Mr. Men and Little Miss characters had been featured in series. The books' simple stories, with brightly coloured, boldly drawn illustrations, made them very popular, with sales of over 100 million worldwide across 28 countries.