The Mr. Men Series is a collection of children's books created by British author Roger Hargreaves. The series features a variety of colorful characters, each with distinct personalities and traits, such as Mr. Happy, Mr. Grumpy, and Little Miss Sunshine. The stories are simple and often convey moral lessons, making them enjoyable for young readers. First published in 1971, the series has expanded to include over 40 titles and has been translated into multiple languages. The charming illustrations and relatable themes have made the Mr. Men characters beloved by children and adults alike, leading to adaptations in television and merchandise.