Mr. Men is a series of 49 children's books by British author Roger Hargreaves commencing in 1971. From 1981, an accompanying series of 42 Little Miss books by the same author, but with female characters were published. After Hargreaves's death in 1988, his son Adam Hargreaves began writing and illustrating new stories like Mr. Good and Mr. Cool.
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